EP3298705A1 - Transpondeur pour un système de transmission radio sur fibre permettant le déport de l'interface de gestion des antennes - Google Patents
Transpondeur pour un système de transmission radio sur fibre permettant le déport de l'interface de gestion des antennesInfo
- Publication number
- EP3298705A1 EP3298705A1 EP16727769.8A EP16727769A EP3298705A1 EP 3298705 A1 EP3298705 A1 EP 3298705A1 EP 16727769 A EP16727769 A EP 16727769A EP 3298705 A1 EP3298705 A1 EP 3298705A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- management
- optical
- radio signal
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
-
- 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
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
- H04B10/25759—Details of the reception of RF signal or the optical conversion before the optical fibre
-
- 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
- H04B10/27—Arrangements for networking
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0272—Transmission of OAMP information
-
- 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
- H04W88/085—Access point devices with remote components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0209—Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0057—Operations, administration and maintenance [OAM]
- H04J2203/0058—Network management, e.g. Intelligent nets
Definitions
- Transponder for a fiber-based radio transmission system allowing the remote control of the antenna management interface
- the invention is in the field of mobile telecommunications networks, and more particularly in the field of optical cable links between antenna sites and a site of the transport network.
- a base station of a mobile network may include one or more antennas positioned in height, generally on a tower or pylon.
- the processing of the broadcast signal is performed by an element called RRH (Remote Radio Head), positioned near an antenna, for example in the tower or at its foot, thanks to its small size.
- the digital signal processing is performed by an element called BBU (Base Band Unit), which can be positioned far from the antenna, for example to tens of kilometers.
- the RRH and the BBU are connected by an optical fiber, and the data transport on this fiber uses the DRoF protocol (Digital Radio over Fiber).
- the management of the alarms of the site, the control of the inclination (Tilt) of the antenna, as well as the management of the opto-electronic operating parameters of the reception and transmission channels of the DRoF signals on the site, that is to say the management of the transponder on the RRH side, are done at the site of the antenna site, and frequently require the movement of technicians on this site.
- one solution is to add three corresponding pairs of lengths. waveform to the optical signal, in addition to the wavelength pair specific to the DRoF signal.
- This solution complicates the processing of the optical signal in the RRH and BBU elements, increases the cost of these elements, while adding a strong constraint of interoperability between these elements, particularly when they are manufactured by different suppliers.
- One of the aims of the invention is to overcome these disadvantages of the state of the art.
- the invention improves the situation with the aid of an optoelectronic transponder for a radio transmission system on fiber, comprising:
- An optical transmission module capable of modulating a first digital radio signal to obtain a first optical signal
- An optical reception module adapted to receive a second optical signal and to demodulate it to obtain a demodulated radio signal
- a digitizing module capable of digitizing the demodulated radio signal to obtain a second digital radio signal
- the transmission module comprising:
- optical scanning module comprising:
- An extraction module capable of extracting a second management signal from the demodulated radio signal, the bit rate of the second management signal being smaller than that of the second digital radio signal.
- an RRH element of an antenna site and a BBU element of a management center to exchange between them management signals, in parallel with the DRoF signal, without adding, as in the prior art, wavelengths specific to these management signals.
- a management signal is added, before its transformation into an optical signal, that is to say in digital radioelectric form, to the digital radio signal of data DRoF to be transmitted, and not directly to the signal optical to emit.
- a management signal is extracted from the digital radio signal obtained after transformation of the received optical signal, and not directly from the received optical signal.
- the management signal becomes an integral part of the DRoF digital radio data signal.
- bit rate of the management signal is lower than that of the data signal, the impact on the bit rate of the DRoF signal is limited.
- the characteristics of the optical signal carrying the DRoF signal remain unchanged, in particular the wavelength in each of the two directions remains the same.
- the purely optical portion of the radio transmission system on optical fiber, between the RRH and BBU elements, is therefore not affected by the invention.
- the addition module is an electronic mixer.
- the operation of adding the management signal is facilitated and inexpensive.
- the electronic mixer is a cheap component that allows to combine several electronic signals of different frequencies, in this case, to add the low bit rate management signal to the high speed digital radio signal.
- the digitizing module comprises an amplifier capable of amplifying the demodulated radio signal
- the extraction module is a low-pass electronic filter connected to an output of the amplifier.
- the ratio of the flow rate of the first or second radio signal to the flow rate respectively of the first or second management signal is greater than or equal to 1000.
- the rate of the DRoF radio signal is greater than 1 Gbit / s.
- the ratio of the flow rate of the first radio signal to the flow rate of the first management signal is identical to the ratio of the flow rate of the second radio signal to the flow rate of the second management signal.
- the same components can be implemented symmetrically in a transponder according to the invention, either on the side of the element RRH or the side of the element BBU.
- the management signal comprises information relating to alarms detected on a site of radio antennas.
- the management signal comprises information relating to a control of the inclination of radio antennas.
- the management signal comprises information relating to a management of the optoelectronic parameters of the optoelectronic transponder.
- the optical transmission module transmits the first optical signal on an optical fiber, and wherein the optical receiver module receives the second optical signal on the same optical fiber.
- an optoelectronic transponder in an RRH element and an optoelectronic transponder in a BBU element to exchange management information in both directions, even if they are interconnected by a single fiber optical.
- the various aspects of the optoelectronic transponder for a radio transmission system on fiber can be implemented independently of each other or in combination with each other.
- the invention also relates to a radio transmission system on optical fiber connecting a management center to at least one radio antenna site, the management center comprising an optoelectronic transponder such as that just described, each of the at least an antenna site also comprising a transponder such as that just described, which is associated with a distinct pair of wavelengths.
- the invention is also more easily adaptable to a configuration where several antenna sites must be managed by the same management center. Indeed, by associating with each antenna site, that is to say the transponder of its element RRH, a pair of wavelengths which is unique to it, it is possible to connect several antenna sites to a single antenna. one and only BBU management center, by one or two optical fibers (only one for both directions of transmission, or one for each direction).
- the different antenna sites may for example be connected in cascade using OADM elements (Optical Add-Drop Multiplexer) adding and extracting the appropriate wavelength of the pair of wavelengths corresponding to an RRH element.
- OADM elements Optical Add-Drop Multiplexer
- the BBU element of the management center can be connected by one or two fibers to a WDM multiplexer which serves each of the antenna sites by one or two dedicated fibers with the pair of wavelengths corresponding to the element. RRH.
- the invention also relates to a method of adding a management signal in a digital radio signal for a radio transmission system on fiber, implemented by a first transponder according to that just described and comprising:
- the method further comprising a step of adding the management signal to the first digital radio signal, the bit rate of the management signal being lower than that of the digital radio signal.
- the invention finally relates to a method for extracting a signal for managing a demodulated radio signal for a radio transmission system over fiber, implemented by a first transponder according to that just described and comprising:
- the method further comprising a step of extracting the management signal from the demodulated radio signal, the bit rate of the management signal being lower than that of the digital radio signal.
- FIG. 1 schematically shows a radio transmission system on fiber comprising optoelectronic transponders according to the prior art
- FIG. 2 shows an exemplary structure of an optoelectronic transponder, according to one aspect of the invention
- FIG. 3 shows an example of a module for digitizing the optoelectronic transponder, according to one aspect of the invention
- FIG. 4 shows an example of a module for receiving the optoelectronic transponder, according to an alternative embodiment of the invention
- FIG. 5 schematically shows a radio transmission system on fiber comprising optoelectronic transponders according to one aspect of the invention
- FIG. 6 shows an exemplary implementation of the method of adding a management signal, according to one embodiment of the invention.
- FIG. 7 shows an exemplary implementation of the method of extracting a management signal, according to one embodiment of the invention.
- Figure 1 schematically shows a prior art fiber radio transmission system including optoelectronic transponders according to the prior art.
- the antenna site on the left-hand part of the figure comprises an RRH radio signal processing element 10, one or more antennas 11, and a site infrastructure represented for the sake of simplification by a single cabinet (or rack). 12, housing for example a power source supplying the antennas 1 1. Not all elements of the site infrastructure are represented, such as a fence, gate, pylon, etc.
- the optical signal So4A comprising four wavelengths, transported in the cable 20, is processed by an optical mux / demux (multiplexer and demultiplexer) 14, which separates the 4 corresponding wavelengths ⁇ 1, ⁇ 2, A3, A4 respectively. to the signal DRoF Srn itself, to the alarm signal S2, to the tilt signal S3, and to the optoelectronic parameterization signal S4.
- wavelength is meant “wavelength pair” when the optical signal is bidirectional.
- the signal DRof is bidirectional for example, but the management signals can be unidirectional.
- the wavelengths A1, A2, A3, A4 may for example be wavelengths called “CWDM" spaced from each other by 20 nm in a range from 1271 nm to 161 1 nm.
- This transponder can be parameterized using the signal of Optoelectronic parameterization S4.
- a control unit 15 having a role similar to the transponder, is responsible for the transformation between wavelengths A2, A3, A4 and electrical signals S2, S3 and S4, operated respectively by the cabinet 12, the antenna 1 1 and transponder 13.
- the site of the management center on the right side of the figure comprises a digital signal processing element BBU 30, as well as other elements not shown such as for example an alarm management module, a tilt management module, an optoelectronic parameter management module.
- the digital signal processing element BBU 30 comprises, analogously to the RRH radio signal processing element 10, an optical mux / demux 34, a transponder 33 and a control unit 35, the assembly enabling the transformation between optical wavelengths carried by the cable 20 and the corresponding digital electrical signals.
- FIG. 2 shows an exemplary structure of an optoelectronic transponder, according to one aspect of the invention.
- the optoelectronic transponder 100 comprises a transmission module 140 input accepting a digital radio signal Srn1, and a management signal Sg1, which is in digital electrical form.
- the transmission module 140 comprises an addition module 141, for example an electronic mixer, which accepts, in input "on the water", the bits of each of the two digital signals Srn1 and Sg1, in order to output a signal digital combining the two signals mixing their respective bits in an order and frequency respecting their respective rate.
- an addition module 141 for example an electronic mixer, which accepts, in input "on the water", the bits of each of the two digital signals Srn1 and Sg1, in order to output a signal digital combining the two signals mixing their respective bits in an order and frequency respecting their respective rate.
- the combined digital signal is then supplied as input to a control circuit 142 of a laser diode Tx of an optical signal transmission port 143 Soi, to which an optical fiber of a cable 20 may be connected. .
- the optoelectronic transponder 100 also comprises a receiving module 150 accepting on a reception port 151 an optical signal So2, for example coming from an optical fiber of a cable connected to the port Rx 151.
- the optical signal So2 is demodulated into a demodulated radio signal Srd, for example by a photodiode of the port 151, and this signal Srd is digitized by a digitizing module 152 to produce a digital radio signal Srn2.
- the module 152 comprises an extraction module 153 able to extract from the signal Srd a management signal Sg2.
- the scanning module 152 is detailed in FIG.
- FIG. 3 shows an example of a module for digitizing the optoelectronic transponder, according to one aspect of the invention.
- the signal Srd is amplified by an amplifier 154, and the amplified signal Srd is clipped by a collector 155 to produce the signal Srn2.
- the amplified signal Srd is divided into two parts, the first part being input to the extraction module 153, which may be embodied by a low-pass filter. This low-pass filter is set to retain only the low-rate portion of the signal Srd amplified by the amplifier 154, to produce the management signal Sg2. The second part of the amplified signal Srd is inputted to the collector 155.
- the amplifier 143 and the collector 155 can be combined in a single component called limiting amplifier ("limiting amplifier” in English), provided to recover the amplified signal Srd for the low-pass filter.
- the signal may in addition, be inputted to a high-pass filter (not shown) to suppress the amplified Srd signal management signal.
- a high-pass filter not shown
- FIG. 4 shows an example of a module for receiving the optoelectronic transponder, according to an alternative embodiment of the invention.
- the receiving module 150 of the optoelectronic transponder comprises a "one-to-two" coupler 156 able to take a part of the received signal So2, for example 10% of the signal, for present at the input of an extraction module 157 comprising a low bandwidth photodiode, able to directly demodulate a low-rate signal, then to present this low-input signal at the input of a digitizing module 158 to produce the signal Sg2 management proper.
- the remaining 90% of the optical signal So2 is presented at the input of the photodiode of the port 151, to be demodulated into the demodulated radio signal Srd, which is then digitized by a digitizer module 159 to produce the digital radio signal Srn2.
- the scanning module is simplified because it does not include the extraction module, since the extraction of the management signal is already performed in the optical part of the receiving module.
- FIG. 5 schematically shows a radio transmission system on fiber comprising optoelectronic transponders according to one aspect of the invention.
- the antenna site on the left side of the figure and the management center on the right side differ from those of the prior art of FIG. 1, among other things by the absence of the two optical mux / demux, because thanks to the transponders 1 13 and 133 according to the invention, a single wavelength A1 is sufficient to transport, by the optical cable 20, a signal So comprising both the signal DRoF itself, as well as the information relating to the management signals S2 , S3 and S4.
- the control unit 1 15 processes the management signal Sg extracted or added by the transponder 1 13, and perform the conversion between this signal and the management signals S2, S3 and S4 respectively exploitable by the site infrastructure for the alarms, by the antenna or antennas of the site, and by the transponder 1 13.
- the control unit 135 processes the management signal Sg extracted or added by the transponder 133, and converts between this signal and management signals that can be used by one or more management applications intended for the mobile network operator. illustrated.
- FIG. 6 shows an exemplary implementation of the method of adding a management signal, according to one embodiment of the invention.
- the method is implemented by a transponder according to that just described, for example the transponder 1 13 of Figure 5.
- the transponder 13 adds a management signal to a digital radio signal, for example according to the technique of the addition module 141 described above, the digital radio signal rate being for example 1000 times that of the digital radio signal. management signal.
- the transponder 1 13 modulates the increased radio signal of the management signal to produce a single wavelength optical signal A1.
- the transponder January 13 transmits the optical signal on an optical fiber, to another transponder according to that just described, for example the transponder 133 of Figure 5.
- FIG. 7 shows an exemplary implementation of the method of extracting a management signal, according to one embodiment of the invention.
- transponder 133 of Figure 5 comprising the digitizing module of Figure 3.
- the transponder 133 receives an optical signal of wavelength ⁇ 1 from another transponder according to that just described, for example the transponder 1 13 of FIG.
- the transponder 133 demodulates the optical signal to produce a demodulated radio signal.
- the transponder 133 scans the demodulated radio signal, for example according to the technique of the module 152 described above, to produce a digitized radio signal while extracting a management signal whose flow rate is for example 1000 times lower. to that of the digitized radio signal.
- the method for extracting a management signal differs from that just described in that the extraction step precedes the steps of demodulation and digitization of the management signal.
- the embodiments of the invention which have just been presented are only some of the possible embodiments. They show that the invention makes it possible to remotely manage at least three different aspects of a mobile telecommunication antenna site: the processing of alarms, the control of the inclination of the antennas and the management of the optoelectronic parameters of the conversion between radio signals and optical signals, without modification of the optical signal carrying the broadcast signal, and without modification of the optical components.
- the invention adapts to all DRoF system configurations with RRH entities connected by optical cable to a BBU entity, regardless of the protocols used to manage alarms, tilt and optoelectronic parameters, eg CPRI, OBSAI, ORI etc.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computing Systems (AREA)
- Optical Communication System (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1554533A FR3036562A1 (fr) | 2015-05-20 | 2015-05-20 | Transpondeur pour un systeme de transmission radio sur fibre permettant le deport de l'interface de gestion des antennes |
| PCT/FR2016/051159 WO2016185130A1 (fr) | 2015-05-20 | 2016-05-17 | Transpondeur pour un système de transmission radio sur fibre permettant le déport de l'interface de gestion des antennes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3298705A1 true EP3298705A1 (fr) | 2018-03-28 |
Family
ID=54356407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16727769.8A Ceased EP3298705A1 (fr) | 2015-05-20 | 2016-05-17 | Transpondeur pour un système de transmission radio sur fibre permettant le déport de l'interface de gestion des antennes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10454582B2 (fr) |
| EP (1) | EP3298705A1 (fr) |
| FR (1) | FR3036562A1 (fr) |
| WO (1) | WO2016185130A1 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070166042A1 (en) * | 2003-12-23 | 2007-07-19 | Seeds Alwyn J | Multiservice optical communication |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9191117B2 (en) * | 1995-05-11 | 2015-11-17 | Ciena Corporation | High-speed optical transponder systems |
| US7493129B1 (en) * | 2002-09-12 | 2009-02-17 | At&T Mobility Ii Llc | Method and apparatus to maintain network coverage when using a transport media to communicate with a remote antenna |
| US7529215B2 (en) * | 2003-11-17 | 2009-05-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Encapsulation of independent transmissions over internal interface of distributed radio base station |
| US8971712B2 (en) * | 2012-03-05 | 2015-03-03 | Georgia Tech Research Corporation | Carrier embedded optical radio-signal modulation of heterodyne optical carrier suppression |
| CN104718795B (zh) * | 2012-10-19 | 2018-05-29 | 日本电信电话株式会社 | 分散式无线通信基站系统、信号处理装置、无线装置和分散式无线通信基站系统的执行方法 |
| JP2014090240A (ja) * | 2012-10-29 | 2014-05-15 | Nippon Telegr & Teleph Corp <Ntt> | 分散型無線通信基地局システム、信号処理装置、無線装置、及び分散型無線通信基地局システムの動作方法 |
-
2015
- 2015-05-20 FR FR1554533A patent/FR3036562A1/fr active Pending
-
2016
- 2016-05-17 EP EP16727769.8A patent/EP3298705A1/fr not_active Ceased
- 2016-05-17 US US15/575,658 patent/US10454582B2/en active Active
- 2016-05-17 WO PCT/FR2016/051159 patent/WO2016185130A1/fr not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070166042A1 (en) * | 2003-12-23 | 2007-07-19 | Seeds Alwyn J | Multiservice optical communication |
Non-Patent Citations (3)
| Title |
|---|
| JOJI MAEDA ET AL: "Mitigation of signal fading in radio over fiber transmission using fiber nonlinearity", OPTICS EXPRESS, vol. 17, no. 6, 16 March 2009 (2009-03-16), pages 4518 - 2497, XP055529543, DOI: 10.1364/OE.17.004518 * |
| See also references of WO2016185130A1 * |
| XP55529548 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3036562A1 (fr) | 2016-11-25 |
| WO2016185130A1 (fr) | 2016-11-24 |
| US10454582B2 (en) | 2019-10-22 |
| US20180115368A1 (en) | 2018-04-26 |
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| 18R | Application refused |
Effective date: 20210627 |