CN101296425A - Technology for supporting efficient light-loaded wireless access - Google Patents
Technology for supporting efficient light-loaded wireless access Download PDFInfo
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- CN101296425A CN101296425A CNA200810115404XA CN200810115404A CN101296425A CN 101296425 A CN101296425 A CN 101296425A CN A200810115404X A CNA200810115404X A CN A200810115404XA CN 200810115404 A CN200810115404 A CN 200810115404A CN 101296425 A CN101296425 A CN 101296425A
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Abstract
The invention provides an idea that a digital optical signal withdrawn from a baseband carries out multiplexing and de-multiplexing of a signal in a passive optical network, and accomplishes multiuser and multisystem reloading by the method of add-drop multiplexing, and proposes that a remote radio technique is used for realizing multisystem sharing station address and the reduction of the cost of equipment and station address. The invention provides a method for supporting high-efficient radio-on-fiber wireless access and a system thereof, wherein, the system comprises a first add-drop multiplexer, an optical path terminal, an optical network unit, a second add-drop multiplexer and a multisystem remote radio base station.
Description
Technical field
The present invention relates to a kind of support light-carried wireless access technology efficiently, relate in particular to a kind of support light-carried wireless cut-in method and system efficiently.
Background technology
The application of wireless technology has more and more widely also run into the bottleneck of many development in the time of high speed development: 1, the bottleneck of radio frequency resources.Wireless frequency resource is non-renewable, and operational frequency resource is fewer and feweri; 2, the bottleneck of cost.Along with the raising of wave frequency, the effective coverage range of single base station is more and more littler, and the covering that finish whole zone just must increase base station number.Come therefrom, the equipment cost that the base station covers is installed, the also corresponding increase of cost of maintenance and site lease.Consider to require the quantity of base station to reduce from economic angle.3, the bottleneck of electromagnetic pollution.Radio communication is very convenient, but may have electromagnetic pollution, and is harmful.The advantage and the bottleneck of relative radio communication, the lucky and radio communication mutual supplement with each other's advantages of the characteristics of optical fiber communication.Optical fiber communication can be supported enough wide bandwidth, does not have electromagnetic pollution and electromagnetic interference, but inserts dumb.The present invention proposes a kind of (ROF) technology that zooms out that radio communication is combined with Fibre Optical Communication Technology, makes full use of the advantage of optical fiber communication and radio communication, overcomes their shortcoming.The remote technology that the present invention proposes is suitable for supporting multi-user and the heavy duty of many systems, radiofrequency signal is transmitted in optical fiber or cable can further be saved the cost that wireless signal covers.
Summary of the invention
In order to address the above problem, the object of the invention is to provide a kind of support light-carried wireless cut-in method and system efficiently.A kind of support provided by the invention is the light-carried wireless connecting system efficiently, and it comprises:
First add-drop multiplexer, be used for when descending signal to input carry out multiplexing with the output baseband digital signal to optical line terminal, and when up signal from optical line terminal to be carried out demultiplexing be that the multiple user signals of many systems enters various types of base station equipments;
Optical line terminal, being used for when descending baseband digital signal being carried out power division becomes multi-user's broadcast singal to be input to optical network unit by optical fiber, and the time division multiplexing that when up, in its coupler, realizes light, and adjust framing to the signal that comes up according to each user side, the many systems light signal that forms the multi-user is to be input to first add-drop multiplexer;
Optical network unit, be used for when descending according to user's address broadcast singal extract with the user-dependent many systems signal of a certain list to be input to second add-drop multiplexer, and when up, delay time with the distance calculation of optical line terminal according to this optical network unit ONU n (n can represent any user from 1 to N), at the permission time slot of regulation, launch the light signal of this subscriber unit to optical line terminal;
Second add-drop multiplexer is used for that the output demultiplexing to optical network unit is multiple monomer system signal when descending, and will be many systems signal from the monomer system signal multiplexing of the baseband radio unit of a plurality of systems of correspondence when up;
In the remote base station of many systems, each system is corresponding to a baseband radio unit, and baseband radio unit is used to finish light-to-current inversion when descending, and signal is become frame frequency by base band, becomes radio frequency by frame frequency and sends to user terminal; And when up in the future the radiofrequency signal of self terminal in the baseband radio unit of correspondence, become frame frequency, become baseband signal then and output to second add-drop multiplexer.
The present invention also provides a kind of support light-carried wireless cut-in method efficiently, it comprises: when descending, first add-drop multiplexer carries out multiplexing to export baseband digital signal to optical line terminal to the signal of input, optical line terminal carries out power division to baseband digital signal and becomes the multiplex broadcasting signal to be input to optical network unit by optical fiber, optical network unit according to user's address in broadcast singal, extract with user-dependent many systems signal to be input to second add-drop multiplexer, second add-drop multiplexer is multiple monomer system signal to the output demultiplexing of optical network unit, each system is corresponding to a baseband radio unit, in the remote base station of many systems, baseband radio unit is finished light-to-current inversion, become frame frequency by base band, become radio frequency by frame frequency and send to user terminal;
When up in the future the radiofrequency signal of self terminal in the extension unit of correspondence, become frame frequency, become baseband signal then and output to second add-drop multiplexer.Second add-drop multiplexer will be many systems signal from the signal multiplexing of the baseband radio unit of a plurality of systems; Optical network unit is according to delaying time with the distance calculation of optical line terminal, at the permission time slot of regulation, to optical line terminal emission light signal; Realize the time division multiplexing of light in the coupler of optical line terminal, and adjust framing according to each user side to the signal that comes up, the many systems light signal that forms the multi-user is to be input to first add-drop multiplexer; It is that the multiple user signals of many systems enters in the center base station that first add-drop multiplexer carries out demultiplexing to the signal from optical line terminal;
The present invention proposes to carry out EPON from the digital signal that base band is pulled out the multiplexing and demultiplexing of signal, finishes multi-user, the heavy duty of many systems with the mode of add drop multiplex.Proposition realizes the multiplexing of many systems far-pulling module with software and radio technique.Proposition reduces the cost that wireless network covers with optical fiber or the direct transmitting radio frequency signal of radio frequency cable, the mode of many systems colocation site.
Description of drawings
Fig. 1 realizes the block diagram of efficient light-carried wireless heavy duty according to the embodiment of the invention with baseband remote technology;
Fig. 2 is the schematic diagram according to the optical-fiber network heavy duty of the support multi-user radio access of the embodiment of the invention;
Fig. 3 is a schematic diagram of realizing many systems according to the embodiment of the invention at user side;
Fig. 4 is the block diagram according to the baseband extension radio frequency subsystem of the embodiment of the invention;
Fig. 5 is the schematic diagram that zooms out many systems Radio Frequency Subsystem according to the radio frequency of the embodiment of the invention.
Embodiment
By combining of optical fiber communication and wireless communication technology, use baseband remote technology can realize many systems and multi-user's wireless heavy duty.The flexibility of radio communication and optical fiber communication anti-interference, the performance of no electromagnetic pollution can be given full play to.Fig. 1 is the The general frame that realizes many systems, multi-user radio heavy duty with baseband remote technology.For the down link direction: from the radio base band signal of various mobile base stations as WIMAX, WCDMA, GSM and PHS etc. are transformed into the light signal that can transmit by behind the add-drop multiplexer in optical-fiber network after the opto-electronic conversion of optical line terminal.Light signal reverts to the signal of telecommunication by optical network unit and add-drop multiplexer after reaching user side, enters the baseband radio unit RRU of various systems.The RRU of various systems finishes respectively and WIMAX, WCDMA, and GSM communicates by letter with multiple wireless terminals such as PHS.For uplink direction:, after WCDMA, the signal of the wireless terminal of GSM and PHS etc. are received by the RRU of various systems, be transformed into the light signal of the digital various systems of base band from many systems WIMAX.The base band light signal of various systems becomes independently baseband I of multichannel after entering the dropinsert MUX demultiplexing after the optical-fiber network transmission, the Q digital signal enters WIMAX respectively, WCDMA, the center base station of GSM and PHS etc.Center base station can cover very big zone by optical-fiber network, can finish the function of more complicated and realize the part of functions of base station controller (RNC).
Certainly optical-fiber network has many advantages, and it is that cost of access is higher that shortcoming, shortcoming are also arranged, and builds and the construction more complicated.If an optical fiber link is only supported a user, then user's cost is too high, and is relatively more difficult in applying in practice.In order to address this problem, Fig. 2 describes the realization principle of the optical-fiber network heavy duty of supporting that multi-user radio inserts in detail.In descending forward link direction: after reaching optical line terminal from the baseband digital signal of many systems add-drop multiplexer, according to actual needs, many systems base band light signal is through the power divider of EPON, power division is finished in optical line terminal (OLT), carry out power division and become 4 the tunnel, broadcast singals such as 8 road or 16 tunnel, optical network unit (ONU) extracts in broadcast singal and user-dependent many systems signal according to user's address.Enter add-drop multiplexer (ADM) from many systems signal of ONU and resolve into multichannel monomer system signal.In up reverse link direction: from the distance calculation time-delay in ONU of many systems signal of ADM according to ONU and OLT, permission time slot in regulation, to OLT emission light signal, send light signal according to the time slot in regulation under the situation of the time-delay of the distance calculation between ONU and the OLT, in the coupler of OLT, realize the time division multiplexing of light.OLT adjusts framing according to each user side to the signal that comes up, and forms many systems light signal of multi-user, enters in the demodulation multiplexer of ADM, and the multiple user signals that resolves into many systems enters center base station equipment.
Fig. 3 is a schematic diagram of realizing many systems at user side.In descending forward link direction, from many systems signal demultiplexing in ADM of ONU, resolve into the WIMAX of various systems, WCDMA, GSM and PHS base band light signal enter RRU1 respectively, RRU2...RRUn.The baseband radio unit of each system can integrate with software and radio technique, the corresponding baseband radio unit of each system.In baseband radio unit, finish light-to-current inversion, become frame frequency, become radio frequency by frame frequency and send to user terminal by base band.In up reverse link direction, come the radiofrequency signal of self terminal in the baseband radio unit of correspondence, to become frame frequency, become baseband signal then.The baseband signal of each system is finished the multiplexing back output of many systems in ADM.A baseband radio unit can insert a plurality of user terminals simultaneously.
From above analysis as can be known, zoom out with respect to radio frequency, baseband extension is fit to finish many systems more, the multiplexing and demultiplexing of multiple user signals.With respect to wavelength division multiplexing (WDM) technology, use time-multiplexed mode, each user is coupled together the quantity of the optical transceiver module that can reduce center base station, reduce wavelength division multiplexer with a wavelength, optical fiber and line cost, but ONU and OLT must finish the multiplexing and demultiplexing of time division signal.
For the complexity that reduces equipment can be used forward and reverse link different wavelength, adopt WDM technology.Fig. 4 is the realization schematic diagram that positive and negative both direction adopts different wave length.Enter the input of RRU from the descending lightwave signal of ADM; At up direction, in ADM, finish the multiplexing of each system RRU signal from the light signal of another wavelength of RRU.
RRU is made up of two parts, and as shown in Figure 4: comprise primary module and the radio-frequency front-end (RFE) of RRU, the primary module of RRU is by power supply, transceiver, and timer and controller are formed.RFE finishes power amplification, and low noise amplifies, and realizes duplex and alarm function.
Because a large amount of uses of remote base station, the quantity of center base station reduces, and the base station cost of the network coverage is built, and safeguards that the cost of lease reduces, but on the other hand, the increased functionality of RRU, quantity increases, and causes that equipment cost increases.For the cost that further reduces RRU can be taked following measure: shown in figure .5, with the photoelectric converting function of RRU, base band, frame frequency, the radio frequency conversion is all removed, directly with optical fiber or radio frequency cable transmitting radio frequency signal.Amplify by antenna, receive and emission.At down direction, radiofrequency signal does not insert from the base band of base station, and can receive with zone or the radio-frequency (RF) output end that antenna directly covers from the base station, is transferred to far-end with optical fiber or radio frequency cable after filtering is amplified.At up direction, amplify after the microwave signal of antenna receiving terminal, be transferred to the overlay area of base station after the filtering by optical fiber or radio frequency cable, the antenna that is transmitted to the base station by antenna receives.According to the frequency of present WLAN, 2G, 3G, select for use microwave devices such as wide band amplification, filtering and antenna can realize many systems colocation site, as shown in Figure 5.
Claims (9)
1. support light-carried wireless connecting system efficiently for one kind, it is characterized in that comprising:
First add-drop multiplexer, be used for when descending signal to input carry out multiplexing with the output baseband digital signal to optical line terminal, and when up signal from optical line terminal to be carried out demultiplexing be that the multiple user signals of many systems enters various types of base station equipments;
Optical line terminal, being used for when descending baseband digital signal being carried out power division becomes each road broadcast singal to be input to optical network unit by optical fiber, and when up, in its coupler, realize the time division multiplexing of light and according to each user side to the signal that comes up, adjust framing, the many systems light signal that forms the multi-user is to be input to first add-drop multiplexer;
Optical network unit, be used for when descending the user according to its address broadcast singal extract with user-dependent many systems signal to be input to second add-drop multiplexer, and in of the distance calculation time-delay of up time network element basis with optical line terminal, at the permission time slot of regulation, to optical line terminal emission light signal;
Second add-drop multiplexer is used for that the output demultiplexing to optical network unit is a monomer system signal when descending, and will be many systems signal from the signal multiplexing of the baseband radio unit of a plurality of systems of correspondence when up; The remote base station of each system, each system are used for finishing light-to-current inversion when descending corresponding to a baseband radio unit, become frame frequency by base band, become radio frequency by frame frequency and send to user terminal; And when up in the future the radiofrequency signal of self terminal in the far-pulling module of correspondence, become frame frequency, become baseband signal then and output to second add-drop multiplexer.
2. system according to claim 1 is characterized in that:
The remote base station of many systems can integrate with software and radio technique.
3. system according to claim 1 and 2 is characterized in that:
A remote base station can insert a plurality of system user terminals simultaneously.
4. system according to claim 3 is characterized in that:
Forward and reverse link is used different wavelength, enter the input of baseband radio unit from the descending lightwave signal of second add-drop multiplexer; At up direction, in second add-drop multiplexer, finish the multiplexing of many systems baseband radio unit signal from the light signal of another wavelength of baseband radio unit.
5. system according to claim 4 is characterized in that:
Baseband radio unit comprises primary module and radio-frequency front-end, and primary module is by power supply, transceiver, and timer and controller are formed; Radio-frequency front-end is finished power amplification, and low noise amplifies, and realizes duplex and alarm function.
6. system according to claim 4 is characterized in that:
Little for user density, little rural area or the suburb of signal phase mutual interference between the terminal use can be amplified by antenna directly with optical fiber or radio frequency cable Transmission Microwave signal, receives and emission.Big for user density, the big inner city of signal phase mutual interference between the terminal use, the radio switch-in method efficiently of employing baseband extension.
7. system according to claim 6 is characterized in that:
At down direction, radiofrequency signal does not insert from the base band of base station, and can receive with zone or the radio-frequency (RF) output end that antenna directly covers from the base station, after amplifying, filtering is transferred to far-end with optical fiber or radio frequency cable, at up direction, amplify after the radiofrequency signal of antenna receiving terminal, be transferred to the overlay area of base station after the filtering by optical fiber or radio frequency cable, the antenna that is transmitted to the base station by antenna receives.
8. support radio switch-in method efficiently for one kind, it is characterized in that comprising:
When up, to be many systems signal from the signal multiplexing of the baseband radio unit of a plurality of systems of correspondence, optical network unit is according to delaying time with the distance calculation of optical line terminal, permission time slot in regulation, to optical line terminal emission light signal, in the coupler of optical line terminal, realize the time division multiplexing of light and according to each user side to the signal that comes up, adjust framing, the many systems light signal that forms the multi-user to be being input to first add-drop multiplexer, and it is that the multiple user signals of multiple monomer system enters various types of base station equipments that first add-drop multiplexer carries out demultiplexing to the signal from optical line terminal.
When descending, first add-drop multiplexer carries out multiplexing to export baseband digital signal to optical line terminal to the signal of input, optical line terminal carries out power division to baseband digital signal and becomes the multiplex broadcasting signal to be input to optical network unit by optical fiber, optical network unit according to user's address in broadcast singal, extract with user-dependent many systems signal to be input to second add-drop multiplexer, second add-drop multiplexer is a monomer system signal to the output demultiplexing of optical network unit.
Each system is corresponding to a baseband radio unit, and when descending, the baseband signal of each system is finished light-to-current inversion in baseband radio unit, become frame frequency by base band, becomes radio frequency by frame frequency and sends to user terminal; And when up in the future the radiofrequency signal of self terminal in the extension unit of correspondence, become frame frequency, become baseband signal then and output to second add-drop multiplexer.
9. method according to claim 8 is characterized in that:
Forward and reverse link is used different wavelength, enter the input of baseband radio unit from the descending lightwave signal of second add-drop multiplexer; At up direction, in second add-drop multiplexer, finish the multiplexing of many systems baseband radio unit signal from the light signal of another wavelength of baseband radio unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810115404XA CN101296425A (en) | 2008-06-23 | 2008-06-23 | Technology for supporting efficient light-loaded wireless access |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810115404XA CN101296425A (en) | 2008-06-23 | 2008-06-23 | Technology for supporting efficient light-loaded wireless access |
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| CNA200810115404XA Withdrawn CN101296425A (en) | 2008-06-23 | 2008-06-23 | Technology for supporting efficient light-loaded wireless access |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860770A (en) * | 2010-05-26 | 2010-10-13 | 中国联合网络通信集团有限公司 | Method and system for converging fixed network and mobile network |
| CN102377027A (en) * | 2010-08-27 | 2012-03-14 | 大唐移动通信设备有限公司 | Active antenna and method for calibrating active antenna |
| CN104093156A (en) * | 2014-07-24 | 2014-10-08 | 京信通信系统（中国）有限公司 | Slave station device address allocation method and system for distributed base station system |
-
2008
- 2008-06-23 CN CNA200810115404XA patent/CN101296425A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860770A (en) * | 2010-05-26 | 2010-10-13 | 中国联合网络通信集团有限公司 | Method and system for converging fixed network and mobile network |
| CN102377027A (en) * | 2010-08-27 | 2012-03-14 | 大唐移动通信设备有限公司 | Active antenna and method for calibrating active antenna |
| CN104093156A (en) * | 2014-07-24 | 2014-10-08 | 京信通信系统（中国）有限公司 | Slave station device address allocation method and system for distributed base station system |
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