CN108718219B - Anti-harmonic interference device for carrier aggregation, antenna device and mobile terminal - Google Patents
Anti-harmonic interference device for carrier aggregation, antenna device and mobile terminal Download PDFInfo
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- CN108718219B CN108718219B CN201810903183.6A CN201810903183A CN108718219B CN 108718219 B CN108718219 B CN 108718219B CN 201810903183 A CN201810903183 A CN 201810903183A CN 108718219 B CN108718219 B CN 108718219B
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Abstract
The embodiment of the invention discloses a carrier aggregation harmonic interference resistant device, an antenna device and a mobile terminal. The anti-harmonic interference device includes: a transmitting terminal of the first duplexer is connected with a first uplink interface which is used for transmitting an uplink signal of a first frequency band in the power amplifier, and a receiving terminal is used for transmitting a downlink signal of the first frequency band to the wireless transceiver; a transmitting terminal of the second duplexer is connected with a second uplink interface which is used for transmitting uplink signals of a second frequency band in the power amplifier through the first filtering unit, and a receiving terminal is used for transmitting downlink signals of the second frequency band to the wireless transceiver; the frequencies of the harmonics of the upstream signal in the first frequency band overlap the frequencies of the downstream signal in the second frequency band; the first filtering unit is used for filtering a part of the harmonic wave of the uplink signal of the first frequency band, which is overlapped with the frequency of the downlink signal of the second frequency band, and the first filtering unit is used for filtering the second harmonic wave of the uplink signal of the first frequency band. The scheme for eliminating the carrier aggregation harmonic interference is small in size and low in cost.
Description
Technical Field
The embodiment of the invention relates to the technical field of carrier aggregation, in particular to a carrier aggregation anti-harmonic interference device, an antenna device and a mobile terminal.
Background
To meet the peak rate per user and system capacity increase, one of the most straightforward approaches is to increase the system transmission bandwidth. Carrier aggregation is widely used because it can effectively increase the system transmission bandwidth.
As shown in fig. 1, in some frequency band combinations of carrier aggregation, the harmonic frequency of the uplink signal of the low frequency band overlaps with the downlink signal frequency band of the medium-high frequency band, and the low frequency band and the medium-high frequency band share one MMPA (Multi-band Multi-mode Power Amplifier), because the interfaces accessed by the respective frequency bands cannot be completely isolated, the harmonic of the uplink signal of the low frequency band is coupled to the uplink interface TX _ HB that sends the medium-high frequency uplink signal through the uplink interface TX _ L B that sends the low frequency uplink signal in the MMPA, and is transmitted to the receiving path of the medium-high frequency downlink signal through the duplexer, that is, the harmonic of the uplink signal of the low frequency band affects the receiving performance of the medium-high frequency band, so that the sensitivity of the receiving performance of the medium-high frequency band is reduced.
In the prior art, to eliminate harmonic interference, as shown in fig. 2, L BPA (L ow Band power amplifier, low frequency power amplifier) is added, and L BPA is spatially separated from the MMPA of middle and high frequency, so as to increase the isolation of low frequency transmission and middle and high frequency reception.
Disclosure of Invention
The invention provides a carrier aggregation harmonic interference resistant device, an antenna device and a mobile terminal, and provides a scheme for eliminating carrier aggregation harmonic interference with small volume and low cost.
In a first aspect, an embodiment of the present invention provides a carrier aggregation based harmonic interference rejection apparatus, where the harmonic interference rejection apparatus includes: the power amplifier, the first filtering unit, the first duplexer and the second duplexer;
a transmitting terminal of the first duplexer is connected with a first uplink interface which is used for transmitting an uplink signal of a first frequency band in the power amplifier, a receiving terminal is used for transmitting a downlink signal of the first frequency band to the wireless transceiver, and an antenna terminal is used for carrying out signal transmission of the signal of the first frequency band with an antenna;
a transmitting terminal of the second duplexer is connected with a second uplink interface, which is used for transmitting uplink signals of a second frequency band, in the power amplifier through the first filtering unit, a receiving terminal is used for transmitting downlink signals of the second frequency band to the wireless transceiver, and an antenna terminal is used for performing signal transmission of the signals of the second frequency band with an antenna;
the frequency of the harmonic of the uplink signal of the first frequency band is overlapped with the frequency of the downlink signal of the second frequency band;
the first filtering unit is configured to filter a portion of the harmonic of the uplink signal in the first frequency band, which overlaps with the frequency of the downlink signal in the second frequency band, and the first filtering unit is configured to filter a second harmonic of the uplink signal in the first frequency band.
In a second aspect, an embodiment of the present invention further provides an antenna apparatus, where the antenna apparatus includes the anti-harmonic interference apparatus according to any embodiment of the present invention, a wireless transceiver, and an antenna;
the wireless transceiver comprises a plurality of downlink interfaces for receiving downlink signals of a plurality of frequency bands, and the downlink interfaces are connected with the receiving terminals of corresponding duplexers in the harmonic interference resisting device;
the antenna is connected with antenna terminals of a plurality of duplexers of the anti-harmonic interference device.
In a third aspect, an embodiment of the present invention further provides a mobile terminal, where the mobile terminal includes the antenna apparatus according to any embodiment of the present invention.
According to the embodiment of the invention, the first filtering unit is arranged on the channel of the frequency band possibly interfered by the harmonic wave, when the harmonic wave interference occurs, the first filtering unit can filter the harmonic wave generating the interference, and the volume of the first filtering unit is smaller than that of the power amplifier, so that the cost is lower than that of the power amplifier.
Drawings
Fig. 1 is a schematic diagram of a carrier aggregation circuit in the prior art;
fig. 2 is a schematic structural diagram of an anti-harmonic interference apparatus for carrier aggregation in the prior art;
fig. 3 is a schematic structural diagram of a carrier aggregation anti-harmonic interference apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an operation process of the anti-harmonic interference apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an operating process of a carrier aggregation anti-harmonic interference apparatus according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of an antenna apparatus according to a third embodiment of the present invention;
fig. 7 is a schematic diagram of a mobile terminal according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 3 is a schematic structural diagram of a carrier aggregation anti-harmonic interference apparatus according to an embodiment of the present invention. As shown in fig. 3, the anti-harmonic interference apparatus includes: a power amplifier 20, a first filtering unit 30, a first duplexer 40, and a second duplexer 50.
A transmission terminal 41 of the first duplexer 40 is connected to the first uplink interface 21 of the power amplifier 20, which transmits the uplink signal of the first frequency band, and a reception terminal is configured to transmit the downlink signal of the first frequency band to the wireless transceiver; the antenna terminal is used for carrying out signal transmission of a first frequency band signal with the antenna.
The transmitting terminal 51 of the second duplexer 50 is connected to the second uplink interface 22 of the power amplifier 20 through the first filtering unit 30, the receiving terminal is configured to transmit the downlink signal of the second frequency band to the wireless transceiver, and the antenna terminal is configured to perform signal transmission of the second frequency band signal with the antenna.
The frequency of the harmonic of the uplink signal of the first frequency band is overlapped with the frequency of the downlink signal of the second frequency band; the first filtering unit 30 is configured to filter a part of the harmonic of the uplink signal in the first frequency band, which overlaps with the frequency of the downlink signal in the second frequency band.
In this embodiment, by arranging the first filtering unit 30 on the transmission channel of the second band signal, when the harmonic of the uplink signal of the first band is transmitted to the second duplexer 50, the first filtering unit 30 may filter the harmonic that generates interference, so as to prevent the harmonic from affecting the receiving performance of the second band through the wireless transceiver transmitted by the receiving terminal of the second duplexer 50.
Fig. 4 is a schematic diagram illustrating an operation process of the harmonic interference rejection apparatus according to an embodiment of the present invention. Specifically, referring to fig. 4, the receiving terminal 42 and the antenna terminal 43 of the first duplexer 40 are respectively connected to the first downlink interface RX1 and the antenna 70 of the wireless transceiver 10 for receiving the downlink signal of the first frequency band. The receiving terminal 52 and the antenna terminal 53 of the second duplexer 50 are respectively connected to a second downlink interface RX2 and an antenna 70 of the wireless transceiver 10 for receiving downlink signals of the second frequency band.
Optionally, the first frequency band is a low-frequency main carrier frequency band of carrier aggregation, and the second frequency band is a medium-high frequency auxiliary carrier frequency band of carrier aggregation. The power amplifier 20 may be an MMPA (Multi-band Multi-mode PowerAmplifier).
The following describes the working process of the anti-harmonic interference apparatus provided in this embodiment with reference to fig. 4: the harmonic signal generated by amplifying the first frequency band uplink signal transmitted by the wireless transceiver 10 through the power amplifier 20 is transmitted from the first uplink interface 21 of the power amplifier 20 to the second uplink interface 22, and because the first filtering unit 30 is disposed between the second upper and lower interfaces 22 of the power amplifier 20 and the second duplexer 50, the harmonic signal transmitted to the second uplink interface 22 of the power amplifier 20 cannot enter the transmitting terminal 51 of the second duplexer 50, that is, the harmonic signal cannot enter the second downlink interface RX2 of the wireless transceiver 10 through the second duplexer 50, so that the harmonic signal of the first frequency band upper and lower signals is prevented from interfering with the medium-high frequency receiving performance of the wireless transceiver 10. Moreover, the first filtering unit 30 allows the second up-down signal of the second frequency band to pass through and transmit to the antenna 70 through the second duplexer 50, that is, the first filtering unit 30 does not affect the transmission performance of the uplink signal of the second frequency band.
Optionally, the first filtering unit 30 is a surface acoustic wave filter, a wave trap or an L C filter, specifically, a surface acoustic wave filter with a pass band corresponding to the uplink signal of the second band, or a wave trap for filtering the downlink signal of the second band corresponding to the frequency band, or a L C filter for suppressing the downlink signal of the second band corresponding to the frequency band, may be selected.
In addition, the first frequency band and the second frequency band may be any one of the following carrier combinations: the first frequency band is a B8 frequency band, and the second frequency band is a B3 frequency band; the first frequency band is a B8 frequency band, and the second frequency band is a B7 frequency band; the first frequency band is a B12 frequency band, and the second frequency band is a B1 frequency band; the first frequency band is a B17 frequency band, and the second frequency band is a B1 frequency band. It should be noted that the frequency band combination is not a limitation to the present invention, and in this embodiment, the first frequency band and the second frequency band may also be other frequency band combinations, and only the frequency of the harmonic of the uplink signal in the first frequency band is overlapped with the frequency of the downlink signal in the second frequency band.
Preferably, the first duplexer 40 and the second duplexer 50 are separated by a ground line to reduce the coupling degree between the first duplexer 40 and the second duplexer 50, so as to prevent the harmonics of the uplink signal of the first frequency band from being transmitted to the second duplexer 50 through spatial coupling. In addition, the spatial coupling degree between the first duplexer 40 and the second duplexer 50 may be reduced by increasing the distance therebetween, and the greater the distance between the first duplexer 40 and the second duplexer 50, the lower the spatial coupling degree therebetween.
In the embodiment, the first filtering unit is arranged on the channel of the frequency band possibly subjected to harmonic interference, when the harmonic interference occurs, the first filtering unit can filter out the harmonic wave generating the interference, the size of the first filtering unit is smaller than that of the power amplifier, and the cost is lower than that of the power amplifier.
Example two
Fig. 5 is a schematic diagram of an operating process of a carrier aggregation anti-harmonic interference apparatus according to a second embodiment of the present invention. As shown in fig. 5, the anti-harmonic interference apparatus includes: a power amplifier 20, a first filtering unit 30, a first duplexer 40, a second duplexer 50, a third duplexer 80, and a second filtering unit 90.
The transmitting terminal 81 of the third duplexer 80 is connected to the third uplink interface 23 of the power amplifier 20 through the second filtering unit 90, and the receiving terminal 82 is configured to transmit the downlink signal of the third frequency band to the wireless transceiver 10; the antenna terminal 83 is used for signal transmission of a third band signal with the antenna 70.
The frequency of the harmonic of the uplink signal of the first frequency band is overlapped with the frequency of the downlink signal of the third frequency band; the second filtering unit 90 is configured to filter a part of the harmonic of the uplink signal in the first frequency band, which overlaps with the frequency of the downlink signal in the third frequency band.
Specifically, the receiving terminal 82 and the antenna terminal 83 of the third duplexer are respectively connected to the third downlink interface RX3 for receiving the downlink signal of the third frequency band in the wireless transceiver 10 and the antenna 70. The first frequency band may be a low-frequency main carrier frequency band in carrier aggregation, the second frequency band may be a medium-frequency auxiliary carrier frequency band in carrier aggregation, and the third frequency band may be a medium-frequency auxiliary carrier frequency band in carrier aggregation. And a part of the harmonic waves of the uplink signal of the first frequency band are overlapped with the frequency of the downlink signal of the second frequency band, and a part of the harmonic waves of the uplink signal of the first frequency band are overlapped with the frequency of the downlink signal of the third frequency band. As shown in fig. 5, by providing the first filtering unit 30 and the second filtering unit 90, the harmonic signals of the first frequency band can be prevented from entering the second duplexer 50 and the third duplexer 80 via the second uplink interface 22 and the third uplink interface 23 of the power amplifier 20, respectively, and thus the harmonic signals of the up-and-down signals of the first frequency band are prevented from interfering with the intermediate frequency and high frequency receiving performance of the wireless transceiver 10.
It should be noted that, in this embodiment, only the case that carrier aggregation has two auxiliary carrier frequency bands is described as an example, in other embodiments, a plurality of auxiliary carrier frequency bands may also be provided, and corresponding filtering units may be arranged on uplink channels of the plurality of auxiliary carrier frequency bands subjected to harmonic interference, so as to avoid that harmonic signals affect the receiving performance of the plurality of auxiliary carrier frequency bands.
Optionally, the first frequency band, the second frequency band and the third frequency band are a B8 frequency band, a B3 frequency band and a B7 frequency band, respectively. Specifically, because the second harmonic of the uplink signal in the B8 frequency band overlaps with the downlink signal frequency in the B3 frequency band, interference is caused to the reception of the downlink signal in the B3 frequency band; the third harmonic of the uplink signal in the B8 frequency band overlaps with the downlink signal frequency in the B7 frequency band, which may interfere with the reception of the downlink signal in the B7 frequency band, so the first filtering unit 30 may be a filtering unit for filtering the second harmonic of the uplink signal in the first frequency band, and the second filtering unit 90 may be a filtering unit for filtering the third harmonic of the uplink signal in the first frequency band. It should be noted that the frequency bands are not specifically limited to the first frequency band, the second frequency band, and the third frequency band, and the first frequency band, the second frequency band, and the third frequency band may also be other frequency band combinations.
Optionally, the second filtering unit 90 may be a surface acoustic wave filter, a trap filter or a L C filter, specifically, the second filtering unit 90 may select a surface acoustic wave filter whose passband is a frequency band corresponding to the uplink signal of the third frequency band, or select a trap filter that filters a frequency band corresponding to the downlink signal of the third frequency band, or may select a L C filter that suppresses a frequency band corresponding to the downlink signal of the third frequency band, or the like.
Preferably, the first duplexer 40 is separated from the third duplexer 80 by a ground line, so as to reduce the coupling degree between the first duplexer 40 and the third duplexer 80, thereby preventing the harmonics of the uplink signal of the first frequency band from being transmitted to the third duplexer through spatial coupling. In addition, the spatial coupling degree between the first duplexer 40 and the third duplexer 80 can be reduced by increasing the distance between the two duplexers, and the spatial coupling degree between the first duplexer 40 and the third duplexer 80 is lower as the distance between the two duplexers is larger.
In this embodiment, the second filtering unit is disposed between the transmitting terminal of the third duplexer and the third uplink interface of the power amplifier, which transmits the uplink signal of the third frequency band, and the first filtering unit is disposed between the transmitting terminal of the second duplexer and the second uplink interface of the power amplifier, which transmits the uplink signal of the second frequency band.
EXAMPLE III
Fig. 6 is a schematic structural diagram of an antenna device according to a third embodiment of the present invention, and referring to fig. 6, the antenna device includes an anti-harmonic interference device 100 according to any embodiment of the present invention, a wireless transceiver 10, and an antenna 70.
The wireless transceiver 10 includes a plurality of downlink interfaces for receiving downlink signals of a plurality of frequency bands, which are connected to the receive terminals of the respective duplexers in the anti-harmonic interference apparatus 100. The antenna 70 is connected to the antenna terminals of the plurality of duplexers of the anti-harmonic interference device 100.
Illustratively, referring to fig. 6, the wireless transceiver 10 is configured to transmit and receive signals in different frequency bands, and each frequency band has a corresponding uplink interface and a corresponding downlink interface, and the uplink interface of each frequency band in the wireless transceiver 10 is connected to a corresponding power amplification module in the power amplifier 20. Specifically, the first downlink interface RX1 of the wireless transceiver 10 for receiving the downlink signal of the first frequency band is connected to the receiving terminal 42 of the first duplexer 40; the second downlink interface RX2 of the wireless transceiver 10 for receiving the downlink signal of the second frequency band is connected to the receiving terminal 52 of the second duplexer 50; the antenna 70 is connected to the antenna terminal 43 of the first duplexer and the antenna terminal 53 of the second duplexer. In addition, the antenna device may further include an antenna switch 60 having one end connected to the first duplexer 40 and the second duplexer 50 and the other end connected to an antenna 70. It should be noted that fig. 6 only shows the case of having two duplexers by way of example, and the present embodiment is not limited thereto, and a plurality of duplexers and a plurality of filtering units may also be provided in other embodiments.
Fig. 7 is a schematic diagram of a mobile terminal according to a third embodiment of the present invention, and referring to fig. 7, an embodiment of the present invention further provides a mobile terminal including the antenna apparatus 200 according to any embodiment of the present invention. The mobile terminal may be a communication product such as a cellular phone and a tablet computer.
The antenna device and the mobile terminal of the present embodiment include all technical features of the anti-harmonic interference device, and accordingly have all the advantages of the anti-harmonic interference device described above.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An anti-harmonic interference apparatus for carrier aggregation, comprising:
the power amplifier, the first filtering unit, the first duplexer and the second duplexer;
a transmitting terminal of the first duplexer is connected with a first uplink interface which is used for transmitting an uplink signal of a first frequency band in the power amplifier, a receiving terminal is used for transmitting a downlink signal of the first frequency band to the wireless transceiver, and an antenna terminal is used for carrying out signal transmission of the signal of the first frequency band with an antenna;
a transmitting terminal of the second duplexer is connected with a second uplink interface, which is used for transmitting uplink signals of a second frequency band, in the power amplifier through the first filtering unit, a receiving terminal is used for transmitting downlink signals of the second frequency band to the wireless transceiver, an antenna terminal is used for performing signal transmission of the signals of the second frequency band with an antenna, the first filtering unit is arranged on a transmitting channel of the signals of the second frequency band, and the first filtering unit is arranged between the power amplifier and the second duplexer;
the frequency of the harmonic of the uplink signal of the first frequency band is overlapped with the frequency of the downlink signal of the second frequency band;
the first filtering unit is configured to filter a portion of the harmonic of the uplink signal in the first frequency band, which overlaps with the frequency of the downlink signal in the second frequency band, the first filtering unit is configured to filter a second harmonic of the uplink signal in the first frequency band, and a volume of the first filtering unit is smaller than a volume of the power amplifier.
2. The anti-harmonic interference device of claim 1, wherein the first filter unit is a surface acoustic wave filter, a trap or an L C filter.
3. The anti-harmonic interference apparatus according to claim 1, wherein the first frequency band and the second frequency band are any one of the following combinations of carriers:
the first frequency band is a B8 frequency band, and the second frequency band is a B3 frequency band;
the first frequency band is a B8 frequency band, and the second frequency band is a B7 frequency band;
the first frequency band is a B12 frequency band, and the second frequency band is a B1 frequency band;
the first frequency band is a B17 frequency band, and the second frequency band is a B1 frequency band.
4. The anti-harmonic interference apparatus of claim 1 wherein the first diplexer and the second diplexer are separated by a ground line.
5. The anti-harmonic interference apparatus according to claim 1, further comprising:
a third duplexer and a second filtering unit;
a transmitting terminal of the third duplexer is connected with a third uplink interface, which is used for transmitting uplink signals of a third frequency band, in the power amplifier through the second filtering unit, and a receiving terminal is used for transmitting downlink signals of the third frequency band to the wireless transceiver; the antenna terminal is used for carrying out signal transmission of a third frequency band signal with the antenna;
the frequency of the harmonic of the uplink signal of the first frequency band is overlapped with the frequency of the downlink signal of the third frequency band;
the second filtering unit is configured to filter a portion of the harmonic of the uplink signal in the first frequency band that overlaps with the frequency of the downlink signal in the third frequency band.
6. The anti-harmonic interference device of claim 5, wherein the first, second and third bands are B8, B3 and B7 bands, respectively.
7. The anti-harmonic interference apparatus according to claim 6, wherein the second filtering unit is configured to filter out a third harmonic of the first band uplink signal.
8. The anti-harmonic interference apparatus of claim 5 wherein the first duplexer and the third duplexer are separated by a ground line.
9. An antenna device comprising the anti-harmonic interference device of any one of claims 1 to 8, a wireless transceiver and an antenna;
the wireless transceiver comprises a plurality of downlink interfaces for receiving downlink signals of a plurality of frequency bands, and the downlink interfaces are connected with the receiving terminals of corresponding duplexers in the harmonic interference resisting device;
the antenna is connected with antenna terminals of a plurality of duplexers of the anti-harmonic interference device.
10. A mobile terminal, characterized in that it comprises an antenna device according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810903183.6A CN108718219B (en) | 2016-05-23 | 2016-05-23 | Anti-harmonic interference device for carrier aggregation, antenna device and mobile terminal |
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| CN201610347301.0A CN106027167B (en) | 2016-05-23 | 2016-05-23 | A kind of anti-harmonic wave interference device, antenna assembly and the mobile terminal of carrier wave polymerization |
| CN201810903183.6A CN108718219B (en) | 2016-05-23 | 2016-05-23 | Anti-harmonic interference device for carrier aggregation, antenna device and mobile terminal |
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| CN108718219B true CN108718219B (en) | 2020-08-04 |
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| CN201610347301.0A Expired - Fee Related CN106027167B (en) | 2016-05-23 | 2016-05-23 | A kind of anti-harmonic wave interference device, antenna assembly and the mobile terminal of carrier wave polymerization |
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| US9391658B2 (en) * | 2014-04-22 | 2016-07-12 | Entropic Communications, Llc | Method and apparatus for cancellation of interference from a spread spectrum phase lock loop |
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2016
- 2016-05-23 CN CN201810903183.6A patent/CN108718219B/en active Active
- 2016-05-23 CN CN201610347301.0A patent/CN106027167B/en not_active Expired - Fee Related
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| CN101207918A (en) * | 2006-12-18 | 2008-06-25 | 启碁科技股份有限公司 | Stand-by communication device simultaneous for multi mobile communication systems |
| CN101442839A (en) * | 2007-11-23 | 2009-05-27 | Nxp股份有限公司 | System for implementing multi-mode standby terminal by filter |
| CN202798729U (en) * | 2012-10-17 | 2013-03-13 | 中国移动通信集团河南有限公司 | Connecting device between base station and digital optical fiber repeater |
| CN105428788A (en) * | 2015-11-28 | 2016-03-23 | 广东欧珀移动通信有限公司 | Antenna apparatus of mobile terminal and mobile terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023075129A1 (en) * | 2021-10-29 | 2023-05-04 | 삼성전자 주식회사 | Electronic device comprising duplexers comprising filters having properties which are adaptively changeable according to state |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106027167A (en) | 2016-10-12 |
| CN106027167B (en) | 2018-09-21 |
| CN108718219A (en) | 2018-10-30 |
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