CN208094557U - A kind of GSM signal uplinks Self-excitation Detection device - Google Patents
A kind of GSM signal uplinks Self-excitation Detection device Download PDFInfo
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- CN208094557U CN208094557U CN201820427455.5U CN201820427455U CN208094557U CN 208094557 U CN208094557 U CN 208094557U CN 201820427455 U CN201820427455 U CN 201820427455U CN 208094557 U CN208094557 U CN 208094557U
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Abstract
Include upstream radio-frequency module, power detector, central processing unit, power circuit and switch module the utility model discloses a kind of GSM signal uplinks Self-excitation Detection device；First output end of the upstream radio-frequency module connects the input terminal of the power detector, the output end of the power detector connects the input terminal of the central processing unit, the output end of the central processing unit connects the first input end of the switch module, the power circuit connects the second input terminal of the switch module, first output end of the switch module connects the first input end of the upstream radio-frequency module, the Self-excitation Detection of device can be carried out automatically, and it is reacted in time after self-excitation phenomena occurs, cut off circuit, it avoids impacting surrounding communication and equipment of itself.
Description
Technical field
The utility model is related to circuit detection field more particularly to a kind of GSM signal uplinks Self-excitation Detection devices.
Background technology
With quickly propelling for urbanization process, the swift and violent development at full speed of present mobile communication, people are to mobile radio communication
The requirement of network quality and data transmission is higher and higher.In the occasions such as building low layer, market place builet below the ground, underground parking, shape
At the blind area and shadow region of mobile communication.In conference and exhibition center, the places such as large-scale stadium, due to crowded, telephone traffic
Height, will not only solve signal covering problem, also need to solve capacity problem.Therefore room can not be solved only by outdoor base station covering
Interior signal problem, it is necessary to which problems could be solved by indoor covering system.Signal expires lattice treasured, and as solving, system chambers are interior to be believed
One of the mode of number covering, have many advantages, such as it is simple in structure, cheap, quick for installation, be easy to safeguard and be widely used, letter
Number full lattice treasured is signal coverage enhancement equipment, can support a mould or the multimode signal in 2G/3G/4G, effectively solves indoor weak covers
Lid problem is suitable for the scenes such as the underground space, bottom commerce, residential households, office, elevator, at low cost, deployment is fast, matter
The advantages such as the reliable, signal stabilization of amount.
Signal expires the input of lattice treasured, output is same frequency equipment, alms giver and retransmitting antenna isolation it is bad, will result in and be
It unites self-excitation, simplicity of explanation is exactly, and the donor antenna that signal expire lattice treasured has received the signal of retransmitting antenna using signal to expire lattice precious
Amplification, is exported by retransmitting antenna, and such vicious circle, consequence is equipment damage, is with the phenomenon that mobile phone test, receives letter
It is number good, do not show phone.Signal expires lattice treasured and causes to seriously affect to former net from goading into action, and influence neighbouring base station receives sensitivity,
The coverage area of base station will greatly reduce, can be by the big face of the destruction of interference since the work antenna that signal expires lattice treasured is higher
Product expands.Uplink self-excitation is easier to occur compared with downlink self-excitation, is said because expiring lattice Bora to signal, receives the intensity of uplink signal
Much bigger compared with downlink signal fluctuation, uplink can also test this spike, but not be that can constantly test, this is to compare
Typical self-excitation phenomena.
The self-excitation test that the prior art expires lattice treasured for signal is mainly conversed in project installation and commissioning with mobile phone test
Quality checks that mobile phone receives power, or tests frequency spectrum with frequency spectrograph, if in-site installation has self-excitation phenomena, field adjustable alms giver
The direction and isolation etc of antenna and retransmitting antenna.
During implementing the utility model embodiment, inventor has found, the prior art is only in project installation and commissioning
Self-excitation Detection is carried out, but equipment has the side that the uncertain factors such as some weather, artificial change antenna in actual use
Some failures occur inside to, isolation and equipment causes equipment self-excitation phenomena occur, and at this moment engineering staff cannot catch up in time
It to scene, can affect to the communication of surrounding, equipment damage can be caused if serious.
Utility model content
The purpose of the utility model embodiment is to provide a kind of GSM signal uplinks Self-excitation Detection device, can carry out automatically
The Self-excitation Detection of circuit, and reacted in time after self-excitation phenomena occurs, circuit is cut off, avoids setting surrounding communication and itself circuit
It is standby to impact.
To achieve the above object, the utility model embodiment provides a kind of GSM signal uplinks Self-excitation Detection device, including
Upstream radio-frequency module, power detector, central processing unit, power circuit and switch module；
The upstream radio-frequency module have first input end, the first output end, the power detector have input terminal and
There is input terminal and output end, the switch module to have first input end, the second input terminal for output end, the central processing unit
And first output end；
First output end of the upstream radio-frequency module connects the input terminal of the power detector, the power detector
Output end connect the input terminal of the central processing unit, the output end of the central processing unit connects the of the switch module
One input terminal, the power circuit connect the second input terminal of the switch module, and the first output end of the switch module connects
Connect the first input end of the upstream radio-frequency module.
Further include the first sound table duplexer as the improvement of said program；
The upstream radio-frequency module also has second output terminal；
The second output terminal of the upstream radio-frequency module connects the input terminal of the first sound table duplexer.
Further include rising tone table duplexer as the improvement of said program；
The upstream radio-frequency module also has the second input terminal；
The output end of the rising tone table duplexer connects the second input terminal of the upstream radio-frequency module.
Further include downlink radio frequency module as the improvement of said program；
The downlink radio frequency module has first input end, the second input terminal and output end；
The switch module also has second output terminal；
The output end of the first sound table duplexer connects the first input end of the downlink radio frequency module, the switching molding
The second output terminal of block connects the second input terminal of the downlink radio frequency circuit, and the output end of the downlink radio frequency circuit connects institute
State the input terminal of rising tone table duplexer.
As the improvement of said program, the upstream radio-frequency module includes the first low-noise amplifier, the filtering of the first sound table
Device and the first RF power amplification pipe；
First low-noise amplifier has first input end, the second input terminal and output end, the first sound table filter
Wave utensil has input terminal and output end, the first RF power amplification pipe to have input terminal, the first output end and second output terminal；
The first input end of first low-noise amplifier connects the first input end of the upstream radio-frequency module, described
Second input terminal of the first low-noise amplifier connects the second input terminal of the upstream radio-frequency module, and first low noise is put
The output end of big device connects the input terminal of first SAW filter, the output end of first SAW filter and described the
The input terminal of one RF power amplification pipe connects, and the first output end of the first RF power amplification pipe connects the upstream radio-frequency module
First output end, the second output terminal of the first RF power amplification pipe connect the second output terminal of the upstream radio-frequency module.
As the improvement of said program, the downlink radio frequency module includes the second low-noise amplifier, the filtering of rising tone table
Device and the second RF power amplification pipe；
Second low-noise amplifier has first input end, the second input terminal and output end, the rising tone table filter
Wave utensil has input terminal and output end, the second RF power amplification pipe to have input terminal and output end；
The first input end of second low-noise amplifier connects the first input end of the downlink radio frequency module, described
Second input terminal of the second low-noise amplifier connects the second input terminal of the downlink radio frequency circuit, and second low noise is put
The output end of big device connects the input terminal of second SAW filter, the output end of second SAW filter and described the
The input terminal of two RF power amplification pipes connects, and the output end of the second RF power amplification pipe connects the output of the downlink radio frequency circuit
End.
As the improvement of said program, the switch module is power MOS field effect transistor.
As the improvement of said program, the power circuit includes switching power circuit, voltage-stabilized power supply circuit, stabilized current supply
Any one in circuit, power power-supply circuit, inverter power circuit, DC-DC power source circuit and protection power source circuit.
Compared with prior art, a kind of GSM signal uplinks Self-excitation Detection device that the utility model embodiment provides, passes through
The power detector detects the upstream radio-frequency mould uplink signal in the block, and the uplink signal is sent to the centre
Device is managed, to carry out judging whether to generate uplink self-excitation phenomena by the central processing unit, if generating uplink self-excitation phenomena, in
The switch module that central processor control is connect with the power circuit disconnects, to stop the power circuit to entire GSM
The power supply of signal uplink Self-excitation Detection device, the self-excitation link of timely pass hull closure avoid impacting surrounding communication, simultaneously
It is also beneficial to the equipment for protecting itself circuit, extends the service life of equipment, saves equipment cost and human cost.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of GSM signal uplinks Self-excitation Detection device in the utility model embodiment.
Fig. 2 is the structural schematic diagram of upstream radio-frequency module as shown in Figure 1.
Fig. 3 is the structural schematic diagram of downlink radio frequency module as shown in Figure 1.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
It is that a kind of structure for GSM signal uplinks Self-excitation Detection device 10 that the utility model embodiment provides is shown referring to Fig. 1
It is intended to.
The GSM signal uplinks Self-excitation Detection device 10 includes upstream radio-frequency module 11, power detector 12, central processing
Device 13, power circuit 14 and switch module 15；The upstream radio-frequency module 11 has first input end, the first output end, described
There is power detector 12 input terminal and output end, the central processing unit 13 to have input terminal and output end, the switching molding
Block 15 has first input end, the second input terminal and the first output end.
First output end of the upstream radio-frequency module 11 connects the input terminal of the power detector 12, the power inspection
The output end for surveying device 12 connects the input terminal of the central processing unit 13, is opened described in the output end connection of the central processing unit 13
The first input end of module 15 is closed, the power circuit 14 connects the second input terminal of the switch module 15, the switching molding
First output end of block 15 connects the first input end of the upstream radio-frequency module 11.
The power detector 12 is to receive radio-frequency input signals, exports voltage corresponding with input radio frequency signal power
Component.
The central processing unit 13 (CPU) is one piece of ultra-large integrated circuit, mainly include arithmetic unit (ALU,
Arithmetic and Logic Unit) and two big component of controller (CU, Control Unit).In addition, further including several
Register and cache memory and the bus for realizing the data contacted between them, control and state.
Specifically, uplink signal 1 time slot of occupancy of the transmittings such as GSM mobile handset terminal, each slot length 577us, wherein
Not comprising signal, at this time sample the power level of protection interval is and equipment in circuit 30.525us protection intervals
Bottom is made an uproar the same, and when self-excitation situation occurs in equipment in device, the protection interval of 30.525us has been also filled with continuous self-excitation letter
Number, whether the power detection using the protection interval in the time slot of GSM signals occurs self-excitation phenomena come equipment in judgment means.Through
Output GSM uplink signals after the upstream radio-frequency module 11 is handled are crossed, the power detector 12 couples upstream radio-frequency
GSM uplink signals, are extracted the signal of sub-fraction by the GSM uplink signals that the processing of module 11 exports later from trunk channel
It is handled, corresponding with GSM uplink signals voltage analog signal is exported in described by the power detector 12
On central processor 13, the central processing unit 13 receives the voltage analog signal, is sampled to the voltage analog signal,
Sampling interval is T (T<30.525 μ s), sampling time 4.615ms, in the power of GSM uplink signals for then obtaining sampling
The minimum power is compared, the default work(by minimum power, i.e. the protection interval power of time slot with predetermined power threshold value
Rate threshold value is that time slot signal power shows if the difference of the two is more than 0 in the GSM signal uplinks Self-excitation Detection device 10
There are self-excitation phenomena, the central processing unit 13 controls the disconnection of the switch module 15, so as to be connect with the switch module 15
The power circuit 14 stop power supply to the GSM signal uplinks Self-excitation Detection device 10, avoid causing surrounding communication
It influences, or even damage equipment of itself.
Preferably, the switch module 15 is power MOS field effect transistor (Power MOSFET), the power MOS
Field-effect transistor is the device made of three kinds of metal, oxide (SiO2 or SiN) and semiconductor materials, so-called power
MOSFET (Power MOSFET), which refers to it, can export larger operating current (several peaces arrive dozens of Ann), for power output stage
Device, power MOS field effect transistor are mainly used for linear or Switching Power Supply.
Preferably, the power circuit 14 refers to the circuit design for the power unit for being supplied to electrical equipment supply of electric power,
The circuit form and feature used, existing AC power also have DC power supply.The power circuit 14 can be switching power circuit,
Voltage-stabilized power supply circuit, stabilized current supply circuit, power power-supply circuit, inverter power circuit, DC-DC power source circuit and protection power source electricity
Any one in road.
Further, the GSM signal uplinks Self-excitation Detection device 10 further includes the first sound table duplexer 16, the rising tone
Table duplexer 17 and downlink radio frequency module 18；The upstream radio-frequency module 11 also has second output terminal and the second input terminal, institute
Stating downlink radio frequency module 18 has first input end, the second input terminal and output end, the switch module 15 also defeated with second
Outlet.
The output end of the rising tone table duplexer 17 connects the second input terminal of the upstream radio-frequency module 11, it is described on
The second output terminal of row radio-frequency module 11 connects the input terminal of the first sound table duplexer 16, the first sound table duplexer 16
Output end connect the first input end of the downlink radio frequency module 18, described in the second output terminal connection of the switch module 15
The output end of second input terminal of downlink radio frequency circuit, the downlink radio frequency circuit connects the defeated of the rising tone table duplexer 17
Enter end.
Sound table duplexer is alien frequencies two-way radios, and the key fitment of trunk desk, effect is will to emit and receive signal phase
Isolation ensures to receive and emit and can work normally simultaneously, it is made of the bandstop filter of two groups of different frequencies, avoids this
Machine emits signal transmission to receiver, and general duplexer is made of six stop-band filters, and each resonance is in transmitting and receives frequency；
Receiving terminal filter resonance prevents transmission power from sealing in receiver in tranmitting frequency, and transmitting terminal filter resonance is in reception frequency
Rate.
Specifically, the GSM downlink signals of GSM Base Transmitters enter the first sound table duplexer 16 by the ports BS, so
Enter the downlink radio frequency module 18 afterwards, after the operations such as radiofrequency signal amplification, frequency-selecting by the downlink radio frequency module 18
Into rising tone table duplexer 17, then enter the computing devices such as mobile phone terminal, computer by the ports MS；Mobile phone terminal, computer
The GSM uplink signals of equal computing devices transmitting enter the rising tone table duplexer 17 by the ports MS, on described
Row radio-frequency module 11 enters described first after the operations such as radiofrequency signal amplification, frequency-selecting by the upstream radio-frequency module 11
Sound table duplexer 16, then enters base station by the ports BS, and the power detector 12 couples in the upstream radio-frequency module 11
GSM uplink signals, after handling the GSM uplink signals, 12 output voltage of the power detector simulation letter
Number input central processing unit 13 (CPU), the power circuit 14 is by the power MOS field effect transistor 15 to described
Upstream radio-frequency module 11 and the downlink radio frequency module 18 power supply, the central processing unit 13 (CPU) control power MOS field effect
Transistor 15 opens or closes.
It should be noted that the uplink signal frequency range of mobile GSM900 includes 885-909Mhz, downlink signal frequency range includes
930-954Mh。
Further, referring to Fig. 2, the upstream radio-frequency module 11 includes the first low-noise amplifier 111, the first sound
Table filter 112 and the first RF power amplification pipe 113；First low-noise amplifier 111 has first input end, the second input
There is input terminal and output end, the first RF power amplification pipe 113 to have for end and output end, first SAW filter 112
Input terminal, the first output end and second output terminal.
The first input end of first low-noise amplifier 111 connects the first input of the upstream radio-frequency module 11
End, the second input terminal of first low-noise amplifier 111 connects the second input terminal of the upstream radio-frequency module 11, described
The output end of first low-noise amplifier 111 connects the input terminal of first SAW filter 112, the first sound table filtering
The output end of device 112 is connect with the input terminal of the first RF power amplification pipe 113, and the first of the first RF power amplification pipe 113
Output end connects the first output end of the upstream radio-frequency module 11, and the second output terminal of the first RF power amplification pipe 113 connects
Connect the second output terminal of the upstream radio-frequency module 11.
Further, referring to Fig. 3, the downlink radio frequency module 18 includes the second low-noise amplifier 181, the rising tone
Table filter 182 and the second RF power amplification pipe 183；Second low-noise amplifier 181 has first input end, the second input
There is input terminal and output end, the second RF power amplification pipe 183 to have for end and output end, second SAW filter 182
Input terminal and output end.
The first input end of second low-noise amplifier 181 connects the first input of the downlink radio frequency module 18
End, the second input terminal of second low-noise amplifier 181 connect the second input terminal of the downlink radio frequency circuit, and described the
The output end of two low-noise amplifiers 181 connects the input terminal of second SAW filter 182, second SAW filter
182 output end is connect with the input terminal of the second RF power amplification pipe 183, the output end of the second RF power amplification pipe 183
Connect the output end of the downlink radio frequency circuit.
The very low amplifier of low-noise amplifier, that is, noise coefficient, before being used as the high frequency or intermediate frequency of all kinds of radio receivers
Set amplifier, and the amplifying circuit of highly sensitive electron detection equipment.
SAW filter (SAW) is the piezoelectric property using piezoelectric material, utilizes input and output transducer
(Transducer) input signal of electric wave is converted into mechanical energy, after treatment, then converts mechanical energy into the signal of electricity,
To reach the unnecessary signal of filtering and noise, promote the target of reception quality, be widely used in various wireless telecommunication systems,
LC resonance circuit is substituted on television set, recorder and GPS receiver, is used for interstage coupling and filtering.It is main
It wants function that noise is to filter, simpler, volume smaller is installed than traditional LC filters.
RF power amplification pipe is also known as power amplifier (power amplifier), refers to that can be produced under the conditions of given distortion rate
For raw maximum power output to drive the amplifier of a certain load, radio-frequency power amplifier (RF PA) is various wireless transmitters
Important component, in order to obtain sufficiently large radio frequency power output, it is necessary to use radio-frequency power amplifier, radio-frequency power amplification
The key technical indexes of device is output power and efficiency, and in addition to this, the harmonic component in output should also be small as far as possible, with
It avoids generating interference to other channels.
A kind of GSM signal uplinks Self-excitation Detection device 10 that the utility model embodiment provides, passes through power detector 12
The uplink signal in upstream radio-frequency module 11 is detected, the upper new signal is sent to the central processing unit 13, to pass through
It states central processing unit 13 to carry out judging whether to generate uplink self-excitation phenomena, if generating uplink self-excitation phenomena, central processing unit 13
It controls the switch module 15 connecting with the power circuit 14 to disconnect, entire GSM is believed with stopping the power circuit 14
The power supply of number uplink Self-excitation Detection circuit, the self-excitation link of timely pass hull closure avoid impacting surrounding communication, while
Be conducive to the equipment for protecting itself circuit, extend the service life of equipment, saves equipment cost and human cost.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the scope of protection of the utility model.
Claims (8)
1. a kind of GSM signal uplinks Self-excitation Detection device, which is characterized in that including upstream radio-frequency module, power detector, center
Processor, power circuit and switch module；
There is the upstream radio-frequency module first input end, the first output end, the power detector to have input terminal and output
There is input terminal and output end, the switch module to have first input end, the second input terminal and for end, the central processing unit
One output end；
First output end of the upstream radio-frequency module connects the input terminal of the power detector, the power detector it is defeated
Outlet connects the input terminal of the central processing unit, and it is first defeated to connect the switch module for the output end of the central processing unit
Enter end, the power circuit connects the second input terminal of the switch module, and the first output end of the switch module connects institute
State the first input end of upstream radio-frequency module.
2. GSM signal uplinks Self-excitation Detection device according to claim 1, which is characterized in that further include that the first sound table is double
Work device；
The upstream radio-frequency module also has second output terminal；
The second output terminal of the upstream radio-frequency module connects the input terminal of the first sound table duplexer.
3. GSM signal uplinks Self-excitation Detection device according to claim 2, which is characterized in that further include that rising tone table is double
Work device；
The upstream radio-frequency module also has the second input terminal；
The output end of the rising tone table duplexer connects the second input terminal of the upstream radio-frequency module.
4. GSM signal uplinks Self-excitation Detection device according to claim 3, which is characterized in that further include downlink radio frequency mould
Block；
The downlink radio frequency module has first input end, the second input terminal and output end；
The switch module also has second output terminal；
The output end of the first sound table duplexer connects the first input end of the downlink radio frequency module, the switch module
Second output terminal connects the second input terminal of the downlink radio frequency circuit, the output end connection of the downlink radio frequency circuit described the
The input terminal of two sound table duplexers.
5. GSM signal uplinks Self-excitation Detection device according to claim 1, which is characterized in that the upstream radio-frequency module
Including the first low-noise amplifier, the first SAW filter and the first RF power amplification pipe；
First low-noise amplifier has first input end, the second input terminal and output end, first SAW filter
With input terminal and output end, the first RF power amplification pipe has input terminal, the first output end and second output terminal；
The first input end of first low-noise amplifier connects the first input end of the upstream radio-frequency module, and described first
Second input terminal of low-noise amplifier connects the second input terminal of the upstream radio-frequency module, first low-noise amplifier
Output end connect the input terminal of first SAW filter, the output end of first SAW filter is penetrated with described first
The input terminal of frequency power tube connects, and the first output end of the first RF power amplification pipe connects the first of the upstream radio-frequency module
Output end, the second output terminal of the first RF power amplification pipe connect the second output terminal of the upstream radio-frequency module.
6. GSM signal uplinks Self-excitation Detection device according to claim 4, which is characterized in that the downlink radio frequency module
Including the second low-noise amplifier, the second SAW filter and the second RF power amplification pipe；
Second low-noise amplifier has first input end, the second input terminal and output end, second SAW filter
With input terminal and output end, the second RF power amplification pipe has input terminal and output end；
The first input end of second low-noise amplifier connects the first input end of the downlink radio frequency module, and described second
Second input terminal of low-noise amplifier connects the second input terminal of the downlink radio frequency circuit, second low-noise amplifier
Output end connect the input terminal of second SAW filter, the output end of second SAW filter is penetrated with described second
The input terminal of frequency power tube connects, and the output end of the second RF power amplification pipe connects the output end of the downlink radio frequency circuit.
7. the GSM signal uplink Self-excitation Detection devices according to claim 1 to 6 any one, which is characterized in that described to open
Pass module is power MOS field effect transistor.
8. GSM signal uplinks Self-excitation Detection device according to claim 7, which is characterized in that the power circuit includes
Switching power circuit, voltage-stabilized power supply circuit, stabilized current supply circuit, power power-supply circuit, inverter power circuit, DC-DC power source electricity
Any one in road and protection power source circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820427455.5U CN208094557U (en) | 2018-03-27 | 2018-03-27 | A kind of GSM signal uplinks Self-excitation Detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820427455.5U CN208094557U (en) | 2018-03-27 | 2018-03-27 | A kind of GSM signal uplinks Self-excitation Detection device |
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| Publication Number | Publication Date |
|---|---|
| CN208094557U true CN208094557U (en) | 2018-11-13 |
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| CN201820427455.5U Expired - Fee Related CN208094557U (en) | 2018-03-27 | 2018-03-27 | A kind of GSM signal uplinks Self-excitation Detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114097177A (en) * | 2019-06-19 | 2022-02-25 | 莫莱克斯Cvs达本多夫有限责任公司 | Circuit arrangement for transmitting wireless signals and method for operating a circuit arrangement |
-
2018
- 2018-03-27 CN CN201820427455.5U patent/CN208094557U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114097177A (en) * | 2019-06-19 | 2022-02-25 | 莫莱克斯Cvs达本多夫有限责任公司 | Circuit arrangement for transmitting wireless signals and method for operating a circuit arrangement |
| CN114097177B (en) * | 2019-06-19 | 2023-07-04 | 莫莱克斯Cvs达本多夫有限责任公司 | Circuit arrangement for transmitting radio signals and method for operating a circuit arrangement |
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Granted publication date: 20181113 Termination date: 20200327 |