CN107395283A - A kind of digital fiber multi-service distributed base station system - Google Patents
A kind of digital fiber multi-service distributed base station system Download PDFInfo
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- CN107395283A CN107395283A CN201710685768.0A CN201710685768A CN107395283A CN 107395283 A CN107395283 A CN 107395283A CN 201710685768 A CN201710685768 A CN 201710685768A CN 107395283 A CN107395283 A CN 107395283A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Abstract
The invention discloses a kind of digital fiber multi-service distributed base station system, belong to technical field of photo communication.Including Base Band Unit, network element unit and extension unit, Base Band Unit is connected with network element unit by optical fiber, and network element unit is connected with extension unit by optoelectronic composite cable；Base Band Unit connects network.After 2G, 3G, 4G multi-standard modulated signal from mobile core network enters Base Band Unit processing, suitable standard interface protocol is wrapped into（Such as CPRI）It is required that frame format after be converted to optical signal transmission to network element unit, network element unit realizes the branch of digital baseband downstream signal and the combining of uplink baseband signal, and baseband signal is transferred into extension unit by optoelectronic composite cable.System can provide 2G, 3G, 4G wireless signal access service, and multiple functions can be developed on the basis of digital intermediate frequency, support star-like, chain, mixed networking.
Description
Technical field
The present invention relates to technical field of photo communication, more particularly to a kind of indoor and outdoors digital fiber multi-service distribution base
Stand system, the system is mainly used in the indoor place such as medium-sized and small enterprises, public hot spot, is a kind of solution of in-door covering enhanced scheme
Certainly scheme.
Background technology
Without capacity digital optical-fiber remote system do not changed with optical path loss etc. with its networking flexibility, system gain it is excellent
Gesture is widely used in recent years, covers a variety of Operation Networks such as 2G, 3G, 4G.Because radio communication is being entered
Row is fast-developing, commercialization and LTE from first generation simulation mobile communication to 2G, 3G（Long Term Evolution, are drilled for a long time
Enter) beforehand research before and after course also there was only time in more than ten years, a variety of communication networks all be present simultaneously in networking in operator
Existing situation, the communication network that most of operator is runing typically have two or more, domestic mobile communication factory
, just there are GSM900, DCS1800, TD-SCDMA2000, WLAN and fixed network broadband in such as China Mobile of family, Chinese joint communication has
GSM900, DCS1800, WCDMA2100, WLAN and fixed network broadband, multiple network are simultaneously deposited and mean that digital RF far-drawing system
Progress optical fiber transmission after the network of multiple types or frequency range is merged can be taken, can so reduce the weight of networking
Multiple investment and property are coordinated.
But because building has serious decay and shielding action to wireless signal, in some large-scale indoor fields
Shop, office building, underground garage and villages within the city, many blind areas being present, then cellphone subscriber can not use.Meanwhile with mobile mutual
The explosive growth of networking flow, is difficult to meet current intelligent terminal user to data without the digital optical-fiber remote system of capacity
The experience perceptibility of business.
In terms of installing with networking, traditional digital fiber system is all to use to build feeder network realization, by passive
Multiple-frequency signal is fused to antenna feeder end and realizes covering by combining device, and the radiation problem of antenna has caused the fear of people, caused to transport
Battalion business is complained and removed in many networking systems of cell and office building.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of band capacity digital fiber multi-service distributed base station system,
Provide the user 2G, 3G, 4G wireless signal access service.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of digital fiber multi-service distributed base station system, including Base Band Unit, network element unit and extension unit, Base Band Unit
Connected with network element unit by digital fiber, network element unit is connected with extension unit by optoelectronic composite cable；Base Band Unit connects
Network；
The Base Band Unit, in downlink, 2G, 3G, 4G multi-standard modulated signal from mobile core network enter base band list
Digital baseband signal is converted to after member, digital baseband signal is converted into optical signal transmission to network element unit；In up-link, by
The optical signal that network element unit enters Base Band Unit is converted to digital baseband signal, is returned to after handling digital baseband signal
Core net；
The network element unit, in downlink, the optical signal that Base Band Unit is transferred to network element unit is converted into downstream digital signal
Afterwards, after downstream digital signal being carried out into branch process, extension unit is sent to after being converted to optical signal；In up-link, zoom out
Unit be transferred to network element unit optical signal be converted into digital uplink signal after, the digital uplink signal that each port is inputted is carried out
Combining processing is converted to optical signal, then is sent to Base Band Unit；
The extension unit, in downlink, the optical signal transmitted by network element unit is converted to data signal, at data signal
Descending intermediate-freuqncy signal is converted to after reason, is downlink radio-frequency signal by descending intermediate-freuqncy signal frequency conversion, after amplifying to downlink radio-frequency signal
It is radiated in space；In up-link, after wireless signal is amplified into extension unit, upstream radio-frequency signal is converted to
Row intermediate-freuqncy signal, up intermediate-freuqncy signal is converted into data signal, optical signal is converted digital signals into, is then transferred to network element
Unit.
The Base Band Unit includes baseband processing unit U1, photoelectric conversion unit U2, power supply unit U3, baseband processing unit
U1 and photoelectric conversion unit U2 composition uplink downlinks, power supply unit U3 supply to baseband processing unit U1 and photoelectric conversion unit U2
Electricity.
The network element unit includes being used for the photoelectric conversion unit U4, digital processing element U5, power supply for connecting Base Band Unit
Unit U6, for connecting the photoelectric conversion unit U7 of extension unit, for connecting the photoelectric conversion unit of next network element unit
U8；Photoelectric conversion unit U4, digital processing element U5 and the photoelectricity for connecting extension unit for connecting Base Band Unit turn
Change unit U7 composition uplink downlinks；Power supply unit U6 is to the photoelectric conversion unit U4 for connecting Base Band Unit, digital processing
Unit U5, the photoelectric conversion unit U7 for connecting extension unit, the photoelectric conversion unit for connecting next network element unit
U8 is powered, and power supply unit U6 is powered by optoelectronic composite cable to extension unit.
The extension unit includes photoelectric conversion unit U9, digital processing element U10, RF processing unit U11, antenna list
First U12 and power supply unit U13；Photoelectric conversion unit U9, digital processing element U10, RF processing unit U11 and antenna element
U12 is sequentially connected composition uplink downlink, and power supply unit U13 is at photoelectric conversion unit U9, digital processing element U10, radio frequency
Manage unit U11 power supplies.
Wherein, the frame lattice based on CPRI standard agreements between Base Band Unit and network element unit, network element unit and extension unit
Formula carries out framing transmission.
Wherein, the networking of star-like, chain or mixing is established by network element unit and extension unit.
Wherein, antenna element U12 uses the single polarization multifrequency antenna of miniature masking.
Wherein, the optical fiber is single mode bidirectional optical fiber.
Beneficial effect：
All connected between technical scheme digital fiber multi-service distributed base station system unit using optical fiber,
Overcome category-5 cable transmission to only have 100m's to support newest LTE network apart from inferior position, simultaneity factor, be one big in data service
Lifting, the transmission means of the access output of multiple business, meets the requirement of the more net Joint construction and sharings of operator, passes through distributed base station
In-door covering is carried out, lifts room subsystem overall performance, it is ensured that covering end " can manage, be controllable ", Base Band Unit use band capacity
Base station design, the problem of conventional chamber subset can be overcome to be brought without capacity, there is provided depth covers and capacity solves
Scheme, to tackle the explosive growth of mobile Internet flow.Specifically, have the following effects that：
1) the multiple services new compartment systems such as 2G, 3G, LTE are supported, are covered for the wireless communication signals depth such as 2G/3G/LTE
Lid.
2) Base Band Unit uses the base station design with capacity, solves the problems, such as capacity, can meet mobile Internet flow
Explosive growth demand.
3) multiservice system, more net coexistence problems is solved, are advantageous to operator's Joint construction and sharing.
4) extension unit integrated micro single polarization multifrequency antenna, it is not required to separately build antenna feeder network system.
5) extension unit uses optoelectronic composite cable remote power feeding, solves the problems, such as local power taking difficulty.
6) multiservice system, solves the demand of any networking mode, and Base Band Unit supports star-like networking, network element unit branch
Star-like networking and chain cascade network are held, extension unit supports star-like networking.
Brief description of the drawings
Fig. 1 is the digital fiber multi-service distributed base station system main body chain graph of the embodiment of the present invention.
Fig. 2 is that framework map is realized inside the Base Band Unit of the embodiment of the present invention.
Fig. 3 is that framework map is realized inside the network element unit of the embodiment of the present invention.
Fig. 4 is that framework map is realized inside the extension unit of the embodiment of the present invention.
Embodiment
Technical solution of the present invention is described in detail below in conjunction with drawings and examples.
A kind of digital fiber multi-service distributed base station system that embodiment provides, including Base Band Unit（AU）, network element list
Member（EU）And extension unit（RU）.
As shown in figure 1, in main body link, Base Band Unit is connected with network element unit by optical fiber, network element unit and zooms out list
Member is connected by optoelectronic composite cable, is typically connected using single mode bidirectional optical fiber.
The Base Band Unit has supports the multiservice functionality such as 2G, 3G, 4G, while 4G networks LTE supports 2 to enter 2 to go out
MIMO（Multiple-input, multiple-output）Technology.
Light transceiver interface and the Optical NE interface for cascade can be set in described network element unit（Typically there are 8）, full
While sufficient depth covering, it is possible to achieve the networking of star-like, chain and mixing.
The single polarization multifrequency antenna of described extension unit RU integrated micros masking realizes that covering requires.
After 2G, 3G, 4G multi-standard modulated signal from mobile core network enters Base Band Unit processing, it is wrapped into suitable
Standardization interface protocol（Such as CPRI）It is required that frame format after be converted to optical signal transmission and realize number to network element unit, network element unit
The branch of word base band downstream signal and the combining of uplink baseband signal, baseband signal is transferred to by optoelectronic composite cable and zooms out list
Member.System can provide 2G, 3G, 4G wireless signal access service, and a variety of work(can be developed on the basis of digital intermediate frequency
Can, support star-like, chain, mixed networking.
For the sake of ease of implementation, there is provided the circuit structure of Base Band Unit, network element unit and extension unit in embodiment
It is described as follows：
1st, Base Band Unit
Such as Fig. 2, Base Band Unit includes baseband processing unit U1, photoelectric conversion unit U2, power supply unit U3.
Its annexation is：
Baseband processing unit U1 connects composition uplink downlink with photoelectric conversion unit U2；
Power supply unit U3 connects baseband processing unit U1 and photoelectric conversion unit U2 respectively, there is provided energy.
Its operation principle is：
In downlink, after 2G, 3G, 4G multi-standard modulated signal from mobile core network enter Base Band Unit, pass through base band
Digital baseband signal is converted to after processing unit U1 processing, digital baseband signal is converted to light letter after photoelectric conversion unit U2
Number it is transferred to network element unit；
In up-link, the optical signal of Base Band Unit is entered by network element unit, digital base is converted to by photoelectric conversion unit U2
Band signal, digital baseband signal return to core net after baseband processing unit U1 processing.
Power supply unit U3 obtains external energy, and provides energy to baseband processing unit U1 and photoelectric conversion unit U2 respectively
Amount.
2nd, network element unit
Such as Fig. 3, the photoelectric conversion unit U4, digital processing element U5, power supply that network element unit includes being used to connect Base Band Unit are single
First U6, for connecting the photoelectric conversion unit U7 of extension unit, for connecting the photoelectric conversion unit U8 of next network element unit.
Its annexation is：
Photoelectric conversion unit U4, digital processing element U5 and the photoelectricity for connecting extension unit for connecting Base Band Unit turn
Change unit U7 composition uplink downlinks；Power supply unit U6 is to the photoelectric conversion unit U4 for connecting Base Band Unit, digital processing
Unit U5, the photoelectric conversion unit U7 for connecting extension unit, the photoelectric conversion unit for connecting next network element unit
U8 is powered, and power supply unit U6 is powered by optoelectronic composite cable to extension unit..
Its operation principle is：
In downlink, Base Band Unit is transferred to the optical signal of network element unit, by the opto-electronic conversion for connecting Base Band Unit
Unit U4 enters digital processing element U5 after being converted into downstream digital signal；Digital processing element U5 carries out downstream digital signal
After branch process, it is transmitted to be converted to be sent to after optical signal for connecting the photoelectric conversion unit U7 of extension unit and zooms out list
Member；
In up-link, extension unit is transferred to the optical signal of network element unit, by the opto-electronic conversion for connecting extension unit
Unit U7 enters digital processing element U5 after being converted into digital uplink signal；Digital processing element U5 inputs each port up
Data signal is combined processing, is then converted to optical signal by being used to connect the photoelectric conversion unit U4 of Base Band Unit, then
It is sent to Base Band Unit.
Power supply unit U6 obtains external energy, to the photoelectric conversion unit U4 for connecting Base Band Unit, digital processing list
First U5, the photoelectric conversion unit U7 for connecting extension unit, the photoelectric conversion unit U8 for connecting next network element unit
Energy is provided.
Power supply unit U6 is powered by optoelectronic composite cable to extension unit.
3rd, extension unit
Such as Fig. 4, extension unit includes photoelectric conversion unit U9, digital processing element U10, RF processing unit U11, antenna element
U12 and power supply unit U13.Antenna element U12 can use the single polarization multifrequency antenna of miniature masking.
Its annexation is：
Photoelectric conversion unit U9, digital processing element U10, RF processing unit U11 and antenna element U12 are sequentially connected on composition
Downlink, power supply unit U13 power to photoelectric conversion unit U9, digital processing element U10, RF processing unit U11.
Its operation principle is：
In downlink, the optical signal transmitted by network element unit enters number after photoelectric conversion unit U9 is converted to data signal
Word processing unit U10,；Data signal is converted to descending intermediate-freuqncy signal, RF processing unit after digital processing element U10 processing
Descending intermediate-freuqncy signal frequency conversion is downlink radio-frequency signal by U11, and radiofrequency signal passes through day after RF processing unit U11 amplifications
Line unit U12 is radiated in space；
In up-link, wireless signal is received into after extension unit by antenna element U12, is put by RF processing unit U11
After big, upstream radio-frequency signal is converted into up intermediate-freuqncy signal；Up intermediate-freuqncy signal is converted to numeral by digital processing element U10
Signal, data signal are converted to optical signal by photoelectric conversion unit U9, are then transferred to network element unit.
Power supply unit U13 obtains external energy（Energy is obtained from network element unit by optoelectronic composite cable）, and light is given respectively
Electric converting unit U9, digital processing element U10, RF processing unit U11 provide energy.
The operation principle of the present invention：
During descending, after 2G, 3G, 4G multi-standard modulated signal from mobile core network enter Base Band Unit, pass through base
After tape handling unit U1 processing, suitable standard interface protocol is wrapped into（Such as CPRI）It is required that frame format after be converted to numeral
Baseband signal, digital baseband signal are converted to optical signal transmission to network element unit after photoelectric conversion unit U2；
In network element unit, Base Band Unit is transferred to the optical signal of network element unit, by the opto-electronic conversion for connecting Base Band Unit
Unit U4 enters digital processing element U5 after being converted into downstream digital signal；Digital processing element U5 carries out downstream digital signal
Multiple optical ports are output to after branch process（Such as 8）, it is transmitted to the photoelectric conversion unit U7 for connecting extension unit and changes
To be sent to extension unit after optical signal.
In extension unit, it is laggard by photoelectric conversion unit U9 to be converted to data signal by the optical signal of network element unit transmission
Enter digital processing element U10,；Data signal is converted to descending intermediate-freuqncy signal, radio frequency processing after digital processing element U10 processing
Descending intermediate-freuqncy signal frequency conversion is downlink radio-frequency signal by unit U11, and radiofrequency signal is led to after RF processing unit U11 amplifications
Cross antenna element U12 to be radiated in space, reach the purpose of signal covering and capacity.Extension unit can provide wireless communication
Number access function.When it is implemented, the specific module of each unit can use the existing chip of prior art to realize.Laser transmits, light
Signal/digital signal conversion, analog/digital conversion etc. are all prior art, are converted using respective digital fiber optical transceiver, A/D
Device etc., it will not go into details by the present invention.
During up, the wireless signal from cellphone subscriber is received into after extension unit by antenna element U12, is passed through
After RF processing unit U11 amplifications, upstream radio-frequency signal is converted into up intermediate-freuqncy signal；Digital processing element U10 will be up
Intermediate-freuqncy signal is converted to data signal（It is packaged into suitable standard interface protocol（Such as CPRI）It is required that frame format）, data signal warp
Cross photoelectric conversion unit U9 and be converted to optical signal, be then transferred to network element unit.In network element unit, extension unit is transferred to network element
The optical signal of unit, by entering numeral after the photoelectric conversion unit U7 of extension unit is converted into digital uplink signal for connecting
Processing unit U5；The digital uplink signal that each port inputs is combined processing by digital processing element U5, then by being used for
The photoelectric conversion unit U4 of connection Base Band Unit is converted to optical signal, then is sent to Base Band Unit.In Base Band Unit, by network element list
Member enters the optical signal of Base Band Unit, is converted to digital baseband signal by photoelectric conversion unit U2, digital baseband signal passes through
After baseband processing unit U1 processing, core net is returned to.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (8)
1. a kind of digital fiber multi-service distributed base station system, it is characterised in that including Base Band Unit, network element unit and zoom out
Unit, the Base Band Unit are connected with network element unit by digital fiber, and the network element unit and extension unit are answered by photoelectricity
Cable connection is closed, the Base Band Unit connects network；
The Base Band Unit, in downlink, 2G, 3G, 4G multi-standard modulated signal from mobile core network enter base band list
Digital baseband signal is converted to after member, digital baseband signal is converted into optical signal transmission to network element unit；In up-link, by
The optical signal that network element unit enters Base Band Unit is converted to digital baseband signal, is returned to after handling digital baseband signal
Core net；
The network element unit, in downlink, the optical signal that Base Band Unit is transferred to network element unit is converted into downstream digital signal
Afterwards, after downstream digital signal being carried out into branch process, extension unit is sent to after being converted to optical signal；In up-link, zoom out
Unit be transferred to network element unit optical signal be converted into digital uplink signal after, the digital uplink signal that each port is inputted is carried out
Combining processing is converted to optical signal, then is sent to Base Band Unit；
The extension unit, in downlink, the optical signal transmitted by network element unit is converted to data signal, at data signal
Descending intermediate-freuqncy signal is converted to after reason, is downlink radio-frequency signal by descending intermediate-freuqncy signal frequency conversion, after amplifying to downlink radio-frequency signal
It is radiated in space；In up-link, after wireless signal is amplified into extension unit, upstream radio-frequency signal is converted to
Row intermediate-freuqncy signal, up intermediate-freuqncy signal is converted into data signal, optical signal is converted digital signals into, is then transferred to network element
Unit.
A kind of 2. digital fiber multi-service distributed base station system according to claim 1, it is characterised in that the base band
Unit includes baseband processing unit U1, photoelectric conversion unit U2, power supply unit U3,
The baseband processing unit U1 and photoelectric conversion unit U2 form uplink downlink, and said supply unit U3 is to Base-Band Processing
Unit U1 and photoelectric conversion unit U2 power supplies.
A kind of 3. digital fiber multi-service distributed base station system according to claim 1, it is characterised in that the network element
Unit includes being used for the photoelectric conversion unit U4, digital processing element U5, power supply unit U6 for connecting Base Band Unit, is drawn for connecting
The photoelectric conversion unit U7 of remote unit, for connecting the photoelectric conversion unit U8 of next network element unit；
Photoelectric conversion unit U4, digital processing element U5 and the photoelectricity for connecting extension unit for connecting Base Band Unit turn
Change unit U7 composition uplink downlinks；Said supply unit U6 is to the photoelectric conversion unit U4 for connecting Base Band Unit, numeral
Processing unit U5, the photoelectric conversion unit U7 for connecting extension unit, the opto-electronic conversion for connecting next network element unit
Unit U8 is powered, and said supply unit U6 is powered by optoelectronic composite cable to extension unit.
4. a kind of digital fiber multi-service distributed base station system according to claim 1, it is characterised in that described to zoom out
Unit includes photoelectric conversion unit U9, digital processing element U10, RF processing unit U11, antenna element U12 and power supply unit
U13；The photoelectric conversion unit U9, digital processing element U10, RF processing unit U11 and antenna element U12 are sequentially connected group
Into uplink downlink, said supply unit U13 is to photoelectric conversion unit U9, digital processing element U10, RF processing unit U11
Power supply.
A kind of 5. digital fiber multi-service distributed base station system according to claim 1, it is characterised in that the base band
The frame format based on CPRI standard agreements carries out framing transmission between unit and network element unit, network element unit and extension unit.
6. a kind of digital fiber multi-service distributed base station system according to claim 1, it is characterised in that pass through network element
Unit and extension unit establish the networking of star-like, chain or mixing.
A kind of 7. digital fiber multi-service distributed base station system according to claim 4, it is characterised in that the antenna
Unit U12 uses the single polarization multifrequency antenna of miniature masking.
A kind of 8. digital fiber multi-service distributed base station system according to claim 1, it is characterised in that the optical fiber
For single mode bidirectional optical fiber.
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