CN103118425A - Implementation method and active micro-power distribution system supporting TD-LTE (time division-long term evolution) dual-channel transmission - Google Patents
Implementation method and active micro-power distribution system supporting TD-LTE (time division-long term evolution) dual-channel transmission Download PDFInfo
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Abstract
The invention relates to an implementation method for TD-LTE (time division-long term evolution) dual-channel transmission. An active micro-power distribution system is adopted for transmitting TD-LTE dual-channel signals in the implementation method. The implementation method includes steps of S01, setting a synchronous circuit on a near-end device of a CATV (community antenna television) cable to synchronize the input TD-LTE signals; S02, respectively transmitting uplink time-slot signals and downlink time-slot signals of a TD-LTE channel into two different radiofrequency links via a radiofrequency switch, and differentiating the uplink signals from the downlink signals on a radiofrequency channel; S03, modulating the uplink signals and the downlink signals by a modulation circuit, transmitting the uplink signals, the downlink signals and a reference clock signal to a far-end device via the CATV cable after the uplink signals are combined with the downlink signals; and S04, enabling the far-end device to shunt and demodulate the received signals. The invention further provides the active micro-power distribution system supporting TD-LTE dual-channel transmission. The implementation method and the active micro-power distribution system have the advantages that the TD-LTE dual-channel signals are transmitted via the CATV cable, and an effect of transmitting the TD-LTE signals and cable television signals on the same cable is realized.
Description
Technical field
The present invention relates to wireless communication technology field, be applied to TD-LTE binary channels indoor distributed system.
Background technology
Along with the fast development of mobile Internet, the user has higher requirement to the data rate of mobile radio communication network, has further promoted development and the evolution of wide-band mobile communication network.In China, 3G has just entered Rapid development stage, and large-scale 4G networking also launches.mainstream technology as 4G, TD-LTE is time division duplex (Time Division Duplex, TDD) the LTE system of pattern, adopt OFDM (Orthogonal Frequency Division Multiplexing, OFDM) and multiple-input and multiple-output (Multiple Input Multiple Output, the advanced wireless transmission technology such as MIMO), the upstream data hardware circuit solution that can realize surpassing the downlink data of 100Mbit/s and surpass 50Mbit/s when the 20MHz wireless bandwidth, it mainly carries high-speed data service, and possesses the voice-over business function, become the emphasis of wireless communication technology development.Yet, even if having the support of 4G technology, due to increasing of indoor user, especially blocking and the wall loss of the increasing of indoor data user, building, and the factors such as spectral bandwidth and interference-limited, cause single macrocellular arrange net pattern oneself through not satisfying the demand of user's high speed seamless access.Therefore, industry is needed a kind of solution that can effectively solve indoor covering problem and capacity problem badly.
At present in carrying out indoor network coverage antenna often can only cloth be placed on corridor when building, and due to the problem of building structure, indoor signal does not often reach requirement.Simultaneously in some buildings due to exist fine fitment to environmental beauty have relatively high expectations, the characteristics such as each floor furred ceiling is shut already, do not allow at the indoor open-wire line of walking, carry out by laying the special-purpose radio-frequency cable difficulty that indoor covering exists coordination aspect and construction aspect, cause the indoor distributed system construction that to carry out routine.Therefore signal of communication being coupled to existing cable and carrying out the co-cable transmission covering of registering one's residence, is a very practical method.See from the perspective of policy, country accelerates to advance " integration of three networks " (telecommunications network, computer network, cable television network) process, and the fusion of many networks has also become following information industry development direction.For giving full play to the technical advantage of the many antennas of TD-LTE, current indoor distribution construction need to be considered twin-channel indoor distributed system simultaneously, reduces follow-up dilatation investment.
The CATV line is the modal cable of registering one's residence, and its access covering reaches 1.5 hundred million users, is to cover one of Wireline the most widely, coaxial cable has broadband, high bandwidth, fabulous noise suppression feature simultaneously, it both can use the analog signal of frequency division multiplex to send, but also transmission of digital signals.How to carry the focus that other network signals have become various technology on existing coaxial network.
Summary of the invention
The object of the present invention is to provide a kind of implementation method of TD-LTE binary channels transmission, utilize CATV cable transmission TD-LTE double-channel signal, reach the effect with the cable TV signal co-cable transmission.
It adopts following scheme to realize: a kind of implementation method of TD-LTE binary channels transmission is characterized in that adopting active micropower compartment system that the TD-LTE double-channel signal is transmitted; Comprise the following steps:
S01: realize the synchronous of input TD-LTE signal by synchronous circuit is set in CATV line near-end device;
S02: by radio-frequency (RF) switch, the uplink and downlink time slot signal of TD-LTE is sent into respectively two different radio frequency links, distinguish the uplink and downlink signal on radio frequency path;
S03: by a modulation circuit, described uplink and downlink signal is modulated, and sent to far end device together with a reference clock signal by the CATV line after closing the road;
S04: far end device carries out along separate routes to the received signal, demodulation; Described far end device and near-end device are equipped with automatic gain and control.
In an embodiment of the present invention, described synchronous employing proofreaies and correct to obtain the frequency domain channel impulse responses by master sync signal being carried out thick synchronous estimation of time and carrier wave frequency deviation, adopt the relevant method that detects, obtain auxiliary synchronous signals, realize the synchronous of TD-LTE signal in CATV line near-end unit.
In an embodiment of the present invention, the method adopts high low pass junction filter, and that realizes different frequency signals closes road and separation.
In an embodiment of the present invention, described far end device calculates downlink gain by detecting descending input end signal power according to power output, according to the principle of uplink downlink gain balance, controls uplink gain.
In an embodiment of the present invention, described automatic gain is controlled to binary channels gain and is carried out gain balance and control, and eliminates because of the binary channels unbalanced power to introducings such as the frequency-conversion processing of TD-LTE signal and transmission line loss differences.
In an embodiment of the present invention, described upward signal is modulated to 899 ± 10MHz, and downstream signal is modulated to 944 ± 10MHz.
Another object of the present invention is to provide a kind of active micropower compartment system of the TD-LTE of support binary channels transmission.
This system adopts following scheme to realize: this system comprises near-end device and far end device;
Described near-end device comprises:
One synchronous control circuit is in order to realize the synchronous of input TD-LTE signal;
One modulation circuit, the uplink and downlink signal that this modulation circuit is told radio-frequency (RF) switch is modulated;
One combiner unit, this combiner unit are sent to far end device together with a reference clock signal by the CATV line after described uplink and downlink signal is closed the road; An and descending automatic gain control unit;
Described far end device comprises:
One branching unit, this branching unit carries out shunt with the signal that this far end device receives;
One demodulator circuit reverts to TD-LTE radiofrequency signal frequently in order to the signal up-conversion with branching unit output; An and up automatic gain control unit;
Described uplink and downlink automatic gain control unit is in order to realize that uplink downlink and binary channels gain are carried out gain balance control.
In an embodiment of the present invention, described synchronization control circuit adopts by master sync signal being carried out thick synchronous estimation of time and carrier wave frequency deviation and proofreaies and correct to obtain the frequency domain channel impulse responses, adopt the relevant method that detects, obtain auxiliary synchronous signals, realize the synchronous of TD-LTE signal in CATV line near-end unit.
In an embodiment of the present invention, described far end device calculates downlink gain by detecting descending input end signal power according to power output, according to the principle of uplink downlink gain balance, controls uplink gain.
In an embodiment of the present invention, described upward signal is modulated to 899 ± 10MHz, and downstream signal is modulated to 944 ± 10MHz.
the present invention utilizes current the most common, arrange net the widest, have the maximum drop cable CATV cable of user and realize the TD-LTE fusion function, and innovation research goes out to support the active micropower compartment system of binary channels TD-LTE transmission, effectively solve present puzzlement TD-LTE chamber and divided a wiring difficult problem in the building that exists in construction, also the TD-LTE double-channel signal successfully is incorporated into the room simultaneously indoor, give full play to the technical advantage of the many antennas of TD-LTE, improved greatly the signal strength signal intensity in the room, improved indoor up-downgoing message transmission rate, greatly improved customer satisfaction.
Description of drawings
Fig. 1 is the internal system structure chart in the embodiment of the present invention.
Fig. 2 is the TD-LTE time slot frame structure in the embodiment of the present invention.
Fig. 3 is the TD-LTE up-downgoing proportioning table in the embodiment of the present invention.
Fig. 4 is TD-LTE modulation, the demodulator circuit in the embodiment of the present invention.
Fig. 5 is the TD-LTE link AGC schematic diagram in the embodiment of the present invention.
Fig. 6 is the CATV line signal transmission frequency spectrum profile in the embodiment of the present invention.
Fig. 7 is that the system in the embodiment of the present invention realizes block diagram.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Method of the present invention realizes that principle is to close the road at signal and the CATV of CATV bus other system, again two paths of signals is separated before arriving television terminal after each device transmission of process CATV system, reach the purpose of registering one's residence by CATV system transmissions other system signal.The method adopts active micropower compartment system that the TD-LTE double-channel signal is transmitted; Comprise the following steps:
S01: realize the synchronous of input TD-LTE signal by synchronous circuit is set in CATV line near-end device;
S02: by radio-frequency (RF) switch, the uplink and downlink time slot signal of TD-LTE is sent into respectively two different radio frequency links, distinguish the uplink and downlink signal on radio frequency path;
S03: by a modulation circuit, described uplink and downlink signal is modulated, and sent to far end device together with a reference clock signal by the CATV line after closing the road;
S04: far end device carries out along separate routes to the received signal, demodulation; Described far end device and near-end device are equipped with automatic gain and control.
Its major technique have following some:
1, adopted on the networking structure of CATV line compartment system product at CATV line near-end cellular installation synchronization control circuit, only need to realize in the near-end unit equipment and input synchronizeing of TD-LTE signal, far-end unit only adopts simple circulator radio-frequency structure, no longer need the base band synchronous circuit is installed demoted far-end unit cost and system complexity;
2, in CATV line near-end unit, the uplink and downlink signals of one of them passage of TD-LTE signal of time-division is distinguished, realize the synchronous of input TD-LTE signal by synchronous circuit, output up-downgoing switching signal is controlled radio-frequency (RF) switch, by controlling the switching sequence of radio-frequency (RF) switch, the uplink and downlink time slot signal of TD-LTE is sent into respectively two different radio frequency links, differentiating uplink and downlink signal on radio frequency path;
3, by inputting local oscillator (LO) signal of different frequency in CATV near-end cells modulate circuit, the uplink and downlink signal of TD-SCDMA is modulated to respectively different frequency, wherein upward signal is modulated to 899 ± 10MHz, downstream signal is modulated to 944 ± 10MHz, after reference clock signal arrives far-end unit by the CATV line, then revert to TD-LTE radiofrequency signal frequently by the demodulator circuit up-conversion;
4, TD-LTE is time-division system, and the up-downgoing traffic carrying capacity is different, should calculate downlink gain according to power output by detecting descending input end signal power, according to the principle of uplink downlink gain balance, controls uplink gain.Adopt in addition automatic gain control (AGC) to binary channels gain carry out gain balance and control, eliminate because of the binary channels unbalanced power to introducings such as the frequency-conversion processing of TD-LTE signal and transmission line loss differences;
5, adopt high low pass junction filter and impedance transformation, realize TD-LTE passage one upward signal, the 934 ~ 954MHz of CATV signal, the 889 ~ 909MHz of 50-750MHz the descending signal of TD-LTE passage one, 2350 ~ 2370MHzTD-LTE passage binary signal close road and separation.
6, because the TD-LTE binary channels belongs to homogenous frequency signal, directly utilize the CATV cable to carry out the double-channel signal transmission and have interference, need to carry out frequency-conversion processing to signal.Because TD-LTE is time-division (TDD) signal, come the differentiating uplink and downlink signal by different time-gap, want to utilize the CATV cable to carry out the TD-LTE binary channels and transmit, must carry out the frequency division multiplexing mode to one road signal wherein and process, otherwise be directly to come signal transmission with the CATV compartment system.
The present embodiment separately provides a kind of active micropower compartment system of the TD-LTE of support binary channels transmission, and this comprises near-end device and far end device;
Described near-end device comprises:
One synchronous control circuit is in order to realize the synchronous of input TD-LTE signal;
One modulation circuit, the uplink and downlink signal that this modulation circuit is told radio-frequency (RF) switch is modulated;
One combiner unit, this combiner unit are sent to far end device together with a reference clock signal by the CATV line after described uplink and downlink signal is closed the road; An and descending automatic gain control unit;
Described far end device comprises:
One branching unit, this branching unit carries out shunt with the signal that this far end device receives;
One demodulator circuit reverts to TD-LTE radiofrequency signal frequently in order to the signal up-conversion with branching unit output; An and up automatic gain control unit;
Described uplink and downlink automatic gain control unit is in order to realize that uplink downlink and binary channels gain are carried out gain balance control.
In order to allow those skilled in the art better understand system of the present invention, the below simply introduces several modules:
One, TD-LTE synchronization control circuit
The Synchronization Control of system adopts the relevant method that detects to obtain synchronizing signal.
In the TD-LTE system, downlink synchronous signal is divided into master sync signal PSS(Primary Synchronization Signal) and auxiliary synchronous signals SSS(Secondary Synchronization Signal).Fig. 2 shows the position view of TD-LTE system frame structure and PSS and SSS.each radio frames (Radio Frame) is long is 10ms, comprise that two length are the field of 5ms, each field comprises that five length are the subframe of 1ms, support the up-downgoing switching cycle of 5ms and 10ms, at 5ms in the cycle, subframe 1 and subframe 6 fixed configurations are special subframe, each special subframe is by descending pilot frequency time slot (DwPTS), 3 special time slots of protection pilot tone (GP) and uplink pilot time slot (UpPTS) form, wherein PSS is positioned at subframe 1, 6 the 3rd OFDM symbol, SSS is positioned at subframe 0, last OFDM symbol of 5, wherein subframe 1 is identical with 6 PSS sequence, subframe 0 is different with 5 SSS sequence, represent with SSS0 and SSS5 respectively.In addition; the TD-LTE system supports multiple transmission bandwidth configuration; in order to guarantee that under each system bandwidth, the realization relative fixing and detection algorithm of PSS and SSS position is simple; PSS and SSS signal always are in the position of the whole system bandwidth 1.08MHz of central authorities on frequency domain; but PSS and SSS sequence mapping are to 62 subcarriers of bandwidth center; middle direct current subcarrier leave a blank need not, respectively there are 5 subcarriers at sequence two ends as protecting not the transmission of data.We can proofread and correct to obtain the frequency domain channel impulse responses by master sync signal being carried out thick synchronous estimation of time and carrier wave frequency deviation, adopt the relevant method that detects, and obtain auxiliary synchronous signals.
TD-LTE supports the up-downgoing switching cycle of 5ms and 10ms, and the switching cycle table is as shown in Fig. 3 up-downgoing proportioning table, and D represents that descending time slot, U represent ascending time slot, and S represents special time slot.Change-over period is that 5ms represents that every 5ms has a special time slot.This class configuration so the feedback of HARQ is comparatively timely, is applicable to the scene higher to delay requirement because 10ms has two up-downgoing transfer points.Change-over period is that 10ms represents that every 10ms has a special time slot, and this configuration is slightly weaker to the assurance of time delay, only has a special time slot but benefit is 10ms, so the capacity relative of system loss is less.
Two, TD-LTE modulation, demodulator circuit
Far-end unit no longer needs the synchronous circuit of TD-LTE in the active micropower compartment system of supporting the transmission of TD-LTE binary channels, uplink and downlink timeslot in the TD-LTE frame structure is distinguished by synchronous circuit in the near-end unit, control radio-frequency (RF) switch by synchronizing signal, within the time period of ascending time slot, control radio-frequency (RF) switch and switch to up radio frequency link, otherwise switch to the downlink radio frequency link.Because the uplink and downlink radiofrequency signal of TD-LTE itself is homogenous frequency signal, need to be modulated into the intermediate-freuqncy signal of different IF frequency could be in the CATV line by channeling and cable TV signal mixed transfer together.
be illustrated in fig. 5 shown below, local oscillator (LO) signal by two different frequencies of input in near-end cells modulate circuit, be 2350～2370MHz with operating frequency range, occupied bandwidth is on the TD-LTE of 20MHz, downstream signal is down-converted to different frequency by frequency mixer, wherein upward signal is down-converted to 889 MHz ~ 909MHz, downstream signal is converted to 934 ~ 954MHz, the intermediate-freuqncy signal of the up-downgoing that frequency conversion obtains enters CATV line arrival far-end unit by the mixing distributor of near-end unit, far-end unit inside is at first by isolating with the demultiplexer of filtering on the TD-LTE of each frequency, descending intermediate-freuqncy signal, and with on TD-LTE, descending intermediate-freuqncy signal reverts to TD-LTE radiofrequency signal frequently by the mixer up-conversion, minimum in order to guarantee frequency error, the near-end unit also transmits the reference clock signal of 12.8MHz to far-end unit by the CATV line, this frequency satisfies the transmission frequency 5-1000MHz requirement of CATV.Far-end unit uses the same clock reference as the reference clock of frequency synthesizer with the near-end unit, and the LO local oscillation signal of acquisition same frequency has reduced the frequency error of equipment.
Revert to the TD-LTE signal of radiofrequency signal by the demodulator circuit up-conversion of far-end unit, only need to connect by circulator, utilize the directivity to the signal selection of circulator device, descending TD-LTE radiofrequency signal is exported to terminal antenna, the TD-LTE radio frequency upward signal of terminal antenna reception is sent into the up link of far-end unit.
Three, automatic gain is controlled (AGC)
The TD-LTE system is tdd systems, up-downgoing varies in size according to traffic carrying capacity with frequency and business time-slot transmitting power, can't be by detecting the control that gains of average power or the power by business time-slot, descending pilot frequency time slot (DwPTS) transmitting power is stable, do not change with traffic carrying capacity, therefore, access unit and capping unit carry out automatic gain control by the DwPTS time slot power that detects respectively separately.By detecting descending input end signal power, calculate downlink gain according to power output, according to the principle of uplink downlink gain balance, control the gain of up link.As shown in Figure 6, uplink downlink all includes the control unit that amplifies and decay, and judges link gain by detection, and link gain is controlled automatically, realizes the control of link gain balance.
Four, signal closes road and separation
Consider to exist between the co-cable transmission double-channel signal and disturb, adopt frequency shift technique that binary channels TD-LTE signal is separated on frequency.Namely to TD-LTE wherein the uplink and downlink signals of a channel signal carry out respectively Frequency-variable Modulation, and the TD-LTE signal of an other passage is not carried out frequency conversion.Consider simultaneously 1GHz signal little characteristics of loss in the CATV cable, one of them passage shift frequency of TD-LTE to the 1GHz frequency range, and is controlled link gain, after frequency conversion, the frequency distribution of this system as shown in Figure 6.After frequency conversion, the TD-LTE double-channel signal reaches and the cable TV signal requirement that conllinear transmits on the CATV line, the near-end unit closes the road, and carries out co-cable transmission by the CATV line by CATV signal, TD-LTE passage one upward signal of 889 ~ 909MHz, the descending signal of TD-LTE passage one of 934 ~ 954MHz, 2350 ~ 2370MHzTD-LTE passage binary signal of mixing distributor with 50-750MHz.
Arrive indoor after, isolate the TD-LTE double-channel signal by the far-end unit in user family again, access unit and capping unit carry out automatic gain control by time slot power separately, by detecting descending input end signal power, calculate downlink gain according to power output, according to the principle of uplink downlink gain balance, control the gain of up link.The two-way balance is carried out indoor covering by dual polarized antenna after amplifying.The CATV signal directly imports television set into, does not affect the user and watches TV programme.Shown in Figure 7 is that system realizes that one drags the active micropower compartment system of many support TD-LTE binary channels transmission.
The present invention adopts the high low pass combined filter of LC and impedance transformation to mate design to port to signal mixing distributor and separator, and each port Insertion Loss, isolation, reflection coefficient etc. all meet design requirement.In the present invention's design, TD-LTE frequency conversion channel down converted frequencies is selected the up 889MHz ~ 909MHz of GSM frequency of China Telecom, descending 934 ~ 954MHz, to consider that signal mixing distributor in this micropower compartment system and separator consider that GSM and TD-LTE are by the situation of the indoor distributed system of CATV cable transmission, the unit circuit has certain compatibility, satisfies the needs under multiple indoor distribution occasion.
The above is only preferred embodiment of the present invention, and all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the implementation method of a TD-LTE binary channels transmission, is characterized in that adopting active micropower compartment system that the TD-LTE double-channel signal is transmitted; Comprise the following steps:
S01: realize the synchronous of input TD-LTE signal by synchronous circuit is set in CATV line near-end device;
S02: by radio-frequency (RF) switch, the uplink and downlink time slot signal of TD-LTE is sent into respectively two different radio frequency links, distinguish the uplink and downlink signal on radio frequency path;
S03: by a modulation circuit, described uplink and downlink signal is modulated, and sent to far end device together with a reference clock signal by the CATV line after closing the road;
S04: far end device carries out along separate routes to the received signal, demodulation; Described far end device and near-end device are equipped with automatic gain and control.
2. the implementation method of TD-LTE binary channels according to claim 1 transmission, it is characterized in that: described synchronous employing proofreaies and correct to obtain the frequency domain channel impulse responses by master sync signal being carried out thick synchronous estimation of time and carrier wave frequency deviation, adopt the relevant method that detects, obtain auxiliary synchronous signals, realize the synchronous of TD-LTE signal in CATV line near-end unit.
3. the implementation method of TD-LTE binary channels according to claim 1 transmission, it is characterized in that: the method adopts high low pass junction filter, and that realizes different frequency signals closes road and separation.
4. the implementation method of TD-LTE binary channels according to claim 1 transmission, it is characterized in that: described far end device is by detecting descending input end signal power, calculate downlink gain according to power output, according to the principle of uplink downlink gain balance, control uplink gain.
5. the implementation method of TD-LTE binary channels according to claim 4 transmission, it is characterized in that: described automatic gain is controlled to binary channels gain and is carried out gain balance and control, and eliminates because of the binary channels unbalanced power to introducings such as the frequency-conversion processing of TD-LTE signal and transmission line loss differences.
6. the implementation method of TD-LTE binary channels according to claim 1 transmission, it is characterized in that: described upward signal is modulated to 899 ± 10MHz, and downstream signal is modulated to 944 ± 10MHz.
7. an active micropower compartment system of supporting the transmission of TD-LTE binary channels, is characterized in that: comprise near-end device and far end device;
Described near-end device comprises:
One synchronous control circuit is in order to realize the synchronous of input TD-LTE signal;
One modulation circuit, the uplink and downlink signal that this modulation circuit is told radio-frequency (RF) switch is modulated;
One combiner unit, this combiner unit are sent to far end device together with a reference clock signal by the CATV line after described uplink and downlink signal is closed the road; An and descending automatic gain control unit;
Described far end device comprises:
One branching unit, this branching unit carries out shunt with the signal that this far end device receives;
One demodulator circuit reverts to TD-LTE radiofrequency signal frequently in order to the signal up-conversion with branching unit output; An and up automatic gain control unit;
Described uplink and downlink automatic gain control unit is in order to realize that uplink downlink and binary channels gain are carried out gain balance control.
8. the active micropower compartment system of support according to claim 7 TD-LTE binary channels transmission, it is characterized in that: described synchronization control circuit adopts by master sync signal being carried out thick synchronous estimation of time and carrier wave frequency deviation and proofreaies and correct to obtain the frequency domain channel impulse responses, adopt the relevant method that detects, obtain auxiliary synchronous signals, realize the synchronous of TD-LTE signal in CATV line near-end unit.
9. the implementation method of TD-LTE binary channels according to claim 7 transmission, it is characterized in that: described far end device is by detecting descending input end signal power, calculate downlink gain according to power output, according to the principle of uplink downlink gain balance, control uplink gain.
10. the implementation method of TD-LTE binary channels according to claim 7 transmission, it is characterized in that: described upward signal is modulated to 899 ± 10MHz, and downstream signal is modulated to 944 ± 10MHz.
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| CN106961734A (en) * | 2016-01-11 | 2017-07-18 | 中兴通讯股份有限公司 | The transmission method and device of information |
| CN106961734B (en) * | 2016-01-11 | 2023-05-30 | 中兴通讯股份有限公司 | Information transmission method and device |
| CN110958412A (en) * | 2019-12-04 | 2020-04-03 | 中邮科通信技术股份有限公司 | CATV network-based multichannel balanced transmission system |
| CN114567354A (en) * | 2020-11-27 | 2022-05-31 | 中国电信股份有限公司 | Method, device and computer readable storage medium for reducing multi-network intermodulation interference |
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| CN103118425B (en) | 2016-08-03 |
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