WO2016106584A1 - 无线前传无源光网络pon系统、光网络设备及方法 - Google Patents
无线前传无源光网络pon系统、光网络设备及方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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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
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- the embodiments of the present invention relate to the field of communications technologies, and in particular, to a wireless forward transmission passive optical network PON system, an optical network device, and a method.
- Passive Optical Network has gradually become the mainstream technology in the field of broadband access.
- video conferencing video conferencing
- 3D TV mobile backhaul
- interactive games the demand for access bandwidth taller and taller.
- bandwidth, long distance, and large branches are needed.
- the signal backhaul of the radio network base station is a backhaul mode, and the bandwidth of the baseband processing unit (BBU) is centralized.
- the radio remote unit (RRU) is located at the far end. At the base station, the RRU and the BBU are transmitted through a Common Public Radio Interface (CPRI) standard.
- CPRI Common Public Radio Interface
- the preamble bandwidth required for transmission between the RRU and the BBU using the CPRI interface is very large, and the transmission efficiency is low.
- the embodiments of the present invention provide a PON system, an optical network device, and a method for the wireless forward transmission passive optical network, so as to reduce the forward transmission bandwidth required by the CPRI interface between the RRU and the BBU, and improve the transmission efficiency.
- an embodiment of the present invention provides an optical line terminal, including:
- a general public radio interface CPRI interface for receiving first data from a baseband processing unit BBU;
- a wireless compatibility module configured to sequentially decode the first data and perform a CPRI control word extraction operation to obtain second data and a CPRI control word;
- a data compression module configured to perform data compression processing on the second data to obtain third data
- a framing module which combines a CPRI control word and an access network control word to form a control frame
- a frequency aggregation module configured to perform frequency aggregation processing on the third data and the control frame
- the digital-to-analog conversion module is further configured to perform digital-to-analog conversion on the frequency-aggregated data to obtain an analog signal;
- the optical transmitter is configured to modulate the analog signal into an optical signal and then send the signal to the optical distribution network ODN.
- the wireless compatible module specifically includes:
- a decoding unit configured to decode the first data
- serial-to-parallel conversion unit configured to perform serial data conversion to parallel data on the decoded first data to obtain two mutually orthogonal data
- the CPRI demapping unit is configured to perform CPRI control word extraction on the mutually orthogonal two channels of data, respectively, to obtain a CPRI control word and the second data including two orthogonal data.
- the method further includes:
- a forward error correction FEC module is configured to perform FEC encoding on the control frame.
- the method further includes:
- a high-order modulation module configured to perform high-order modulation on the control frame after the FEC encoding
- the TS processing module is configured to input the training sequence to the aggregation module after the high-order modulated control frame is added.
- the data compression module is specifically configured to: perform the second data
- the constellation map is reorganized to obtain the third data.
- the aggregation module includes:
- a fast Fourier transform FFT unit configured to perform FFT transformation on the third data and the control frame respectively;
- An inverse fast Fourier transform IFFT unit configured to perform an IFFT transform on the FFT-transformed third data and the control frame;
- a parallel-to-serial conversion unit configured to perform parallel transformation of the third data and the control frame subjected to the IFFT transformation to the serial data, and then send the data to the ODN.
- an embodiment of the present invention further provides an optical network unit, including:
- An optical receiver configured to receive an optical signal sent by the optical distribution network ODN, and convert the optical signal into an analog signal
- An analog to digital conversion unit configured to convert the analog signal into a digital signal
- a frequency de-aggregation module configured to perform frequency de-aggregation processing on the digital signal to obtain a third data and a control frame
- bit recombination module configured to decompress the third data to obtain second data
- a framing module configured to extract an access network control word in the control frame, to obtain a general public radio interface CPRI control word
- a wireless compatibility module configured to sequentially perform a CPRI frame restoration and encoding operation on the CPRI control word and the second data to obtain first data
- the CPRI interface is configured to send the first data to the radio remote unit RRU.
- the method further includes:
- the channel compensation module is configured to perform channel compensation processing and forward error correction FEC encoding processing on the control frame to obtain error rate BER information of the channel.
- the wireless compatible module is specifically configured to: perform scrambling on the encoding according to a size relationship between the BER and the threshold.
- the wireless compatible module is specifically configured to: add 1 after the nth bit if the sum of the original coding bits is greater than a set threshold n Add 1 after the last bit; or, if the sum of the original coded bits is less than the set threshold n, add 0 after the nth bit and add 0 after the last bit, where n is a positive integer greater than one.
- the wireless compatible module includes:
- a CPRI frame restoration unit configured to sequentially perform CPRI frame restoration on the CPRI control word and the second data
- a coding unit configured to encode data that has been restored by the CPRI frame, and send the first data to the RRU.
- the frequency de-aggregation module package include:
- a serial to parallel conversion unit configured to perform serial data conversion to parallel data on the data signal
- a fast Fourier transform FFT unit for performing FFT transform on the serial-to-parallel converted digital signal
- An inverse fast Fourier transform IFFT unit is configured to perform an IFFT transform on the FFT-transformed digital signal to obtain the third data and the control frame.
- the embodiment of the present invention further provides a wireless forward transmission passive optical network PON system, including a baseband processing unit BBU, the optical line terminal OLT according to the first aspect, and an optical distribution network ODN, as described in the second aspect above.
- a wireless forward transmission passive optical network PON system including a baseband processing unit BBU, the optical line terminal OLT according to the first aspect, and an optical distribution network ODN, as described in the second aspect above.
- the BBU communicates with the OLT via a universal public radio interface CPRI thereon; the RRU communicates with the ONU via a CPRI interface thereon.
- the embodiment of the present invention further provides a PON method for a wireless preamble passive optical network, including:
- the analog signal is modulated into an optical signal and then transmitted to the optical distribution network ODN.
- the performing the decoding of the first data and the CPRI control word extraction operation to obtain the second data and the CPRI control word specifically include:
- the CPRI control word extraction is performed on the mutually orthogonal two channels of data, respectively, to obtain a CPRI control word and the second data including two orthogonal data.
- the CPRI control word And the access network control word, after forming the control frame further includes:
- FEC encoding is performed on the control frame.
- the method further includes: performing high-order modulation on the FEC-encoded control frame; After the training sequence is added to the control frame after the high-order modulation, the frequency aggregation processing is performed.
- the data compression processing is performed on the second data, to obtain a Three data, including:
- the second data is subjected to constellation recombination to obtain the third data.
- the The control frame performs frequency aggregation processing, and specifically includes:
- the third data and the control frame subjected to the IFFT transformation are converted into parallel data and sent to the ODN.
- the embodiment of the present invention further provides a PON method for a wireless preamble passive optical network, including:
- the method further includes:
- the performing the encoding operation on the CPRI control word and the second data includes:
- the encoding is scrambled according to the magnitude relationship between the BER and the threshold.
- the scrambling the coding according to the relationship between the BER and the threshold specifically includes:
- the CPRI control word and the second data are sequentially
- the CPRI frame restoration and encoding operation is performed to obtain the first data, which specifically includes:
- the frequency of the digital signal is performed De-aggregation processing to obtain the third data and control frame, specifically including:
- the wireless forward transmission passive optical network PON system, the optical network device and the method provided by the embodiment of the present invention are respectively processed into the data part and the control word part by performing wireless compatible processing on the data received from the CPRI interface of the BBU by the OLT. Partially processed separately, so that the data portion can be compressed as much as possible to reduce the forward transmission bandwidth and improve the transmission efficiency.
- FIG. 1 is a schematic structural diagram of an embodiment of a wireless forward transmission passive optical network PON system according to the present invention
- FIG. 2 is a schematic structural diagram of an embodiment of an optical line terminal OLT according to the present invention.
- FIG. 3 is a schematic structural diagram of still another embodiment of an optical line terminal OLT according to the present invention.
- FIG. 4 is a schematic structural diagram of an embodiment of an optical network unit ONU according to the present invention.
- FIG. 5 is a schematic structural diagram of still another embodiment of an optical network unit ONU according to the present invention.
- Figure 6 is a schematic diagram of 8B/10B encoding provided by the present invention.
- FIG. 7 is a flowchart of an embodiment of a wireless forward transmission passive optical network PON method according to the present invention.
- FIG. 8 is a flowchart of still another embodiment of a wireless forward passive optical network PON method according to the present invention.
- FIG. 1 is a schematic structural diagram of an embodiment of a wireless forward transmission passive optical network PON system according to the present invention.
- the wireless forward transmission PON system includes: a BBU, an optical line termination (OLT), and an optical distribution network (Optical Distribution Network (ODN), optical network unit (ONU), and radio remote unit RRU;
- ONT optical line termination
- ODN optical distribution network
- ONU optical network unit
- RRU radio remote unit
- the BBU communicates with the OLT through the CPRI on the BRU; the RRU communicates with the ONU through the CPRI interface thereon.
- the existing OLT equipment by improving the existing OLT equipment, correspondingly, the existing ONU equipment is improved to reduce the forward transmission bandwidth and improve the transmission efficiency.
- the specific improvements will be elaborated in the following apparatus and method embodiments.
- RRU that is, both Communicate with multiple RRUs.
- FIG. 2 is a schematic structural diagram of an embodiment of an optical line terminal OLT according to the present invention. As shown in FIG. 2, the device includes:
- a CPRI interface 20 configured to receive first data from a baseband processing unit BBU;
- the wireless compatibility module 21 is configured to perform first decoding of the first data and a CPRI control word extraction operation of the common public radio interface to obtain the second data and the CPRI control word;
- the data compression module 22 is configured to perform data compression processing on the second data to obtain third data.
- a framing module 23 configured to form a CPRI control word and an access network control word into a new control frame
- the frequency aggregation module 24 is configured to perform frequency aggregation processing on the third data and the control frame.
- the digital-to-analog conversion module 25 is further configured to perform digital-to-analog conversion on the frequency-aggregated data to obtain an analog signal;
- the optical transmitter 26 is configured to modulate the analog signal into an optical signal and then send the signal to the optical distribution network ODN.
- the RRU can be set at the remote base station.
- the BBU sends the user equipment (User Equipment, UE) as I/Q data, that is, two channels of data orthogonal to each other, wherein the I channel data and the Q channel data each have 15 bits, and the BBU is in the I.
- the channel data and the Q data are each added with a 1-bit CPRI protocol control word, so the I-channel data and the Q-channel data each have 16 bits, and the total number of bits is 32 bits.
- 32-bit serial data is obtained, and the data is sent to the OLT through the CPRI interface of the BBU.
- the first data received from the CPRI interface 20 needs to be wirelessly compatible through the wireless compatibility module 21. It mainly includes a decoding process corresponding to the encoding at the BBU and a CPRI control word extraction process.
- the purpose of the CPRI control word extraction process is to divide the first data into a data part and a control word part, and perform processing separately thereafter.
- the obtained data portion that is, the second data is compressed by the data compression module 22, thereby minimizing the bandwidth of the preamble.
- the extracted control word part needs to be further added to the access network control word, for example: PON management control word, in order to ensure that all control words are not in error during transmission, further, special control processing can be performed on all control words ( Control frames are obtained as FEC).
- the frequency aggregation module 24 After the data part and the control word part are processed separately, the frequency aggregation module 24 performs frequency aggregation into one channel of data, and then performs analog-to-digital conversion and modulation, and then sends the data to the ODN, and the ODN is sent to the ONU.
- the optical line terminal OLT provided by the embodiment of the present invention divides the data received from the CPRI interface of the BBU into a data part and a control word part after being wirelessly compatible, and can separately process the two parts, so that the data can be compressed as much as possible. Partly, the forward transmission bandwidth is reduced, and the transmission efficiency is improved.
- FIG. 3 is a schematic structural diagram of still another embodiment of an optical line terminal OLT according to the present invention. As shown in FIG. 3, based on the embodiment shown in FIG. 2:
- This data compression method minimizes the preamble bandwidth.
- the device may further include: a forward error correction FEC module 27, configured to perform FEC encoding on the control frame.
- a forward error correction FEC module 27 configured to perform FEC encoding on the control frame.
- the high-order modulation module 28 is configured to perform high-order modulation on the FEC-encoded control frame.
- the TS processing module 29 is configured to input the training sequence to the frequency aggregation module 24 after the high-order modulated control frame is added.
- the embodiment further provides a preferred implementation of the wireless compatibility module 21, which may include:
- a decoding unit 211 configured to decode the first data
- the serial to parallel conversion unit 212 is configured to perform serial data conversion to parallel data on the decoded first data to obtain two channels of data orthogonal to each other;
- the CPRI deframing unit 213 is configured to perform CPRI control word extraction on two mutually orthogonal data, respectively, to obtain a CPRI control word and second data including two orthogonal data.
- the embodiment further provides a preferred implementation of the frequency aggregation module 24, which may include:
- Fast Fourier Transform FFT unit 241 for performing FFT on the third data and control frame respectively Transform; wherein a plurality of FFT units 241 may be included to perform FFT transform on the multiplexed third data and control frames.
- An inverse fast Fourier transform IFFT unit 242 configured to perform an IFFT transform on the FFT-transformed third data and the control frame;
- the parallel-to-serial conversion unit 243 is configured to perform parallel data-to-serial data conversion on the IFFT-transformed third data and the control frame, and then send the data to the ODN through the digital-to-analog conversion module and the optical transmission module.
- the I channel signal and the Q channel signal have 15 bits each at the BBU, and the rate is 30.72 MS/s.
- the total number of bits after adding a one-bit CPRI control word is 32 bits.
- This data stream is then encoded, for example, after 8B/10B encoding, the standard CPRI rate of 1.228Gb/s is obtained.
- the decoding unit 211 first performs corresponding decoding, for example, 8B/10B decoding, to obtain a data stream of 983.4 Mb/s.
- the serial to parallel conversion unit 212 performs a serial/parallel conversion to restore 16 bits of I and 16 bits of Q.
- the CPRI deframing unit 213 extracts the control word again. After the constellation recombination of the second data, the bandwidth is compressed by 15 times, and after the original 30.72 MS/s signal is obtained, the frequency aggregation module is entered.
- the processed signal output bandwidth of the frequency aggregation module 24 is 20 MHz, which is greatly reduced compared to the existing 1.228 G bandwidth, and a compression efficiency of up to 40 times is obtained.
- the optical line terminal OLT provided by the embodiment of the present invention divides the data received from the CPRI interface of the BBU into a data part and a control word part after being wirelessly compatible, and can separately process the two parts, in order to avoid transmission error of the control word part.
- the error correction processing can be performed on the control word portion.
- the constellation recombination can be performed to compress the data, so that the data part can be compressed as much as possible to reduce the forward transmission bandwidth, improve the transmission efficiency, reduce the bandwidth of the required optoelectronic device and the number of required front-end optical fibers, and greatly reduce the network investment and operation and maintenance. cost.
- FIG. 4 is a schematic structural diagram of an embodiment of an optical network unit ONU according to the present invention. As shown in FIG. 4, the device includes:
- the optical receiver 41 is configured to receive an optical signal sent by the optical distribution network ODN, and convert the optical signal into an analog electrical signal;
- An analog to digital conversion module 42 for converting an analog signal into a digital signal
- the frequency de-aggregation module 43 is configured to perform frequency de-aggregation processing on the digital signal to obtain a third data and a control frame.
- a bit recombination module 44 configured to decompress the third data to obtain the second data
- a demapping module 45 configured to extract an access network control word and a CPRI control word in the control frame
- the wireless compatibility module 46 is configured to sequentially perform a CPRI frame restoration and encoding operation on the CPRI control word and the second data to obtain the first data.
- the CPRI interface 47 is configured to send the first data to the radio remote unit RRU.
- optical signal sent by the OLT is sent to the ONU through the ODN, and the processing in the ONU is basically a reverse operation processed in the OLT.
- the third data sum is obtained by the frequency deaggregation process of the frequency de-aggregation module 43. Control frame.
- the second data is compressed in the OLT device to reduce the forward transmission bandwidth.
- the data portion is decompressed and restored in the ONU, and the bit reassembly module 44 performs decompression processing to obtain the second data.
- the access network control word is added to the CPRI control word in the OLT device.
- the deframing module 45 in the OLT extracts the access network control word and the CPRI control word from the control frame.
- the wireless compatible module 46 sequentially performs the CPRI frame restoration and encoding operation on the CPRI control word and the second data to obtain the original first data, and then sends the CPRI interface of the RRU through the CPRI interface 47.
- the RRU device is sent to the UE through an antenna after a decoding operation reversed from the BBU, for example, 8B/10B decoding, serial-to-parallel conversion operation, intermediate frequency (IF) processing, and digital-to-analog conversion.
- a decoding operation reversed from the BBU for example, 8B/10B decoding, serial-to-parallel conversion operation, intermediate frequency (IF) processing, and digital-to-analog conversion.
- the optical network unit ONU provided by the embodiment of the present invention can separately process the two parts according to the wireless compatible processing of the data received from the CPRI interface of the BBU at the OLT, so that the two parts can be processed separately. It is possible to compress the data portion and reduce the forward transmission bandwidth.
- the ONU cooperates with the OLT device to perform reverse processing operations of the OLT device, thereby improving transmission efficiency.
- FIG. 5 is a schematic structural diagram of still another embodiment of an optical network unit ONU according to the present invention, as shown in FIG. 5, based on the embodiment shown in Figure 4:
- the CPRI frame sent by the original BBU device is obtained.
- 8B/10B encoding is required here, but if only the usual 8B/10B encoding is performed, the RRU device When receiving the information, the 8B/10B decoding error will never be detected, but this is not the case, so we introduce the innovative BER-based 8B/10B encoding module here.
- the channel compensation module 47 may be configured to perform channel compensation processing and forward error correction FEC encoding processing on the control frame to obtain error rate BER information of the channel.
- the wireless compatibility module 46 is specifically configured to: scramble the code according to the size relationship between the BER and the threshold.
- an appropriate BER threshold BERth can be set based on the BER.
- BER ⁇ BERth normal 8B/10B coding can be used; when BER BERth, 8B/10B coding with interference can be used.
- the wireless compatibility module 46 may be specifically configured to: add 1 after the nth bit and add 1 after the last bit if the sum of the original coded bits is greater than the set threshold n; or if the sum of the original coded bits is less than To set the threshold n, add 0 after the nth bit and add 0 after the last bit.
- n can take 4.
- the 8B/10B encoded output that introduces interference is the original 8 bits, and 1 is added after the fourth bit, at the last one. Add 1 after the bit; or, when the sum of the original 8 bits is ⁇ 4, the 8B/10B encoded output that introduces interference is the original 8 bits, adding 0 after the fourth bit, and adding 0 after the last bit.
- the embodiment further provides a specific implementation manner of the wireless compatibility module 46, which may include:
- the CPRI frame restoring unit 461 is configured to perform CPRI frame restoration on the CPRI control word and the second data in sequence;
- the encoding unit 462 is configured to encode the data restored by the CPRI frame, and send the first data to the RRU.
- the frequency de-aggregation module 43 includes:
- the serial to parallel conversion unit 431 is configured to perform serial data conversion to parallel data on the data signal
- a fast Fourier transform FFT unit 432 configured to perform FFT transform on the serial-to-parallel converted digital signal
- the inverse fast Fourier transform IFFT unit 433 is configured to perform an IFFT transform on the FFT-transformed digital signal to obtain a third data and a control frame.
- the optical network unit ONU provided by the embodiment of the present invention can separately process the two parts according to the wireless compatible processing of the data received from the CPRI interface of the BBU at the OLT, so that the two parts can be processed separately. It is possible to compress the data portion and reduce the forward transmission bandwidth.
- the ONU cooperates with the OLT device to perform reverse processing operations of the OLT device, thereby improving transmission efficiency.
- the ONU provided in this embodiment can generate a BER by means of channel compensation, so as to scramble the code according to the relationship between the BER and the threshold, so that the RRU can recognize the data information or the CPRI control word is wrong. Error message and start the appropriate error handler.
- FIG. 7 is a flowchart of an embodiment of a PON method for a wireless preamble passive optical network according to the present invention. As shown in FIG. 7, the method includes:
- S703 Perform data compression processing on the second data to obtain third data; and form a control frame by using the CPRI control word and the access network control word;
- the analog signal is modulated into an optical signal and then sent to the optical distribution network ODN.
- the first data is sequentially decoded and the CPRI control word is extracted, and the second data and the CPRI control word are obtained.
- the method may include: decoding the first data; and performing serial data on the decoded first data. Parallel data is transformed to obtain two mutually orthogonal data; CPRI control word extraction is performed on two mutually orthogonal data, respectively, to obtain a CPRI control word and second data including two orthogonal data.
- the method further includes: performing FEC encoding on the control frame.
- the method further includes: performing high-order modulation on the FEC-encoded control frame; adding a training sequence to the control frame after the high-order modulation, and performing frequency aggregation processing.
- performing data compression processing on the second data to obtain the third data may include: performing, by using the second data, constellation recombination to obtain the third data.
- performing frequency aggregation processing on the third data and the control frame may specifically include performing FFT transformation on the third data and the control frame respectively, and performing IFFT transformation on the FFT-transformed third data and the control frame;
- the third data and control frame of the IFFT transform are converted into parallel data and sent to the ODN.
- the PON method of the wireless forward transmission passive optical network provided by this embodiment corresponds to the OLT device in the embodiment shown in FIG. 1 to FIG. 3 , and the specific execution process and corresponding beneficial effects can be referred to FIG. 1 to FIG. 3 .
- the related description in the embodiment is omitted, and details are not described herein again.
- FIG. 8 is a flowchart of still another embodiment of a method for wireless forward passive optical network PON according to the present invention. As shown in FIG. 8, the method includes:
- performing frequency de-aggregation processing on the digital signal to obtain the third data and the control frame may further include: performing channel compensation processing and forward error correction FEC encoding processing on the control frame to obtain a bit error rate BER information of the channel. .
- the encoding operation of the CPRI control word and the second data may include: scrambling the encoding according to a relationship between a BER and a threshold.
- the coding is performed according to the relationship between the BER and the threshold, which may include:
- performing a CPRI frame restoration and encoding operation on the CPRI control word and the second data to obtain the first data may include: sequentially performing CPRI frame restoration on the CPRI control word and the second data; and performing restoration on the CPRI frame.
- the data is encoded and the first data is sent to the RRU.
- the frequency de-aggregation processing is performed on the digital signal to obtain the third data and the control frame, which may include: converting the serial data to the parallel data of the data signal; performing FFT transformation on the serial-converted digital signal; The FFT-transformed digital signal is subjected to IFFT conversion to obtain a third data and control frame.
- the PON method of the wireless pre-passive passive optical network provided in this embodiment corresponds to the ONU device in the embodiment shown in FIG. 4 to FIG. 6 , and the specific execution process and corresponding beneficial effects can be referred to FIG. 4 to FIG. 6 .
- the related description in the embodiment is omitted, and details are not described herein again.
- the disclosed system, apparatus, and method may be implemented in other manners.
- the device embodiments described above are merely illustrative.
- the division of the modules or units is only a logical function division.
- there may be another division manner for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
- a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
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Abstract
本发明实施例涉及一种无线前传无源光网络PON系统、光网络设备及方法,通过OLT对从BBU的CPRI接口接收到的数据进行无线兼容处理后分成数据部分和控制字部分,可以对这两部分进行分别处理,从而可以尽可能的压缩数据部分而降低前传带宽,提高了传输效率。
Description
本发明实施例涉及通信技术领域,特别涉及一种无线前传无源光网络PON系统、光网络设备及方法。
无源光网络(Passive Optical Network,PON)在宽带接入领域逐渐成为主流技术,随着各种宽带业务:视频会议、3D电视、移动回传、互动游戏的快速发展,对接入带宽的需求越来越高。面对未来的宽带演进,需要更大的带宽、长距离、大分支。
目前,无线网络基站信号回传采用的是回程链路(backhaul)方式,基带处理单元(Band width Based Unit,BBU)设备集中方式,各射频拉远单元(Radio Remote Unit,RRU)位于远端的基站上,RRU和BBU之间通过通用公共无线电接口(Common Public Radio Interface,CPRI)标准传输。
然而,RRU和BBU之间采用CPRI接口传输所需要的前传带宽非常大,从而传输效率低下。
发明内容
本发明实施例提供一种无线前传无源光网络PON系统、光网络设备及方法,以降低RRU和BBU之间采用CPRI接口传输所需要的前传带宽,提高传输效率。
第一方面,本发明实施例提供了一种光线路终端,包括:
通用公共无线电接口CPRI接口,用于从基带处理单元BBU中接收的第一数据;
无线兼容模块,用于对所述第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字;
数据压缩模块,用于对所述第二数据进行数据压缩处理,得到第三数据;
成帧模块,将CPRI控制字和接入网控制字,组成控制帧;
频率聚合模块,用于对所述第三数据和所述控制帧进行频率聚合处理;
数模转换模块,还用于对经过频率聚合处理后的数据进行数模转换,得到模拟信号;
光发射器,用于对所述模拟信号调制为光信号后发送给光分配网络ODN。
结合第一方面,在第一方面的第一种实施方式中,所述无线兼容模块具体包括:
解码单元,用于对所述第一数据进行解码;
串并转换单元,用于对经过解码的第一数据进行串行数据到并行数据的变换,得到相互正交的两路数据;
CPRI解帧单元,用于分别对所述相互正交的两路数据进行CPRI控制字提取,得到CPRI控制字和包括两路正交数据的所述第二数据。
结合第一方面或第一种实施方式,在第一方面的第二种实施方式中,还包括:
前向纠错FEC模块,用于对所述控制帧进行FEC编码。
结合第二种实施方式,在第一方面的第三种实施方式中,还包括:
高阶调制模块,用于对经过所述FEC编码后的控制帧进行高阶调制;
TS处理模块,用于在经过高阶调制后的控制帧中加入训练序列后输入至所述聚合模块。
结合第一方面或第一种实施方式或第二种实施方式或第三种实施方式,在第一方面的第四种实施方式中,所述数据压缩模块具体用于:所述第二数据进行星座图重组,得到所述第三数据。
结合第一方面或第一种实施方式或第二种实施方式或第三种实施方式或第四种实施方式,在第一方面的第五种实施方式中,所述聚合模块包括:
快速傅里叶变换FFT单元,用于分别对所述第三数据和所述控制帧进行FFT变换;
反快速傅里叶变换IFFT单元,用于对经过FFT变换后的第三数据和控制帧进行IFFT变换;
并串变换单元,用于对经过IFFT变换的第三数据和控制帧进行并行数据到串行数据的变换后发送给所述ODN。
第二方面,本发明实施例还提供一种光网络单元,包括:
光接收器,用于接收光分配网络ODN发送的光信号,并将所述光信号转换为模拟信号;
模数转换单元,用于将所述模拟信号转换为数字信号;
频率解聚合模块,用于对所述数字信号进行频率解聚合处理,得到第三数据和控制帧;
比特重组模块,用于对所述第三数据进行解压缩,得到第二数据;
解帧模块,用于在所述控制帧提取接入网控制字,得到通用公共无线电接口CPRI控制字;
无线兼容模块,用于对所述CPRI控制字和所述第二数据依次进行CPRI帧还原和编码操作,得到第一数据;
CPRI接口,用于将所述第一数据发送给射频拉远单元RRU。
结合第二方面,在第二方面的第一种实施方式中,还包括:
信道补偿模块,用于对所述控制帧进行信道补偿处理和前向纠错FEC编码处理,得到信道的误码率BER信息。
结合第二方面或第一种实施方式,在第二方面的第二种实施方式中,所述无线兼容模块具体用于:根据BER与阈值的大小关系,对编码进行加扰。
结合第二种实施方式,在第二方面的第三种实施方式中,所述无线兼容模块具体用于:若原始编码比特之和大于设定阈值n,则在第n比特后添加1并且在最后一个比特之后添加1;或者,若原始编码比特之和小于设定阈值n,则在第n比特后添加0并且在最后一个比特之后添加0,其中n为大于1的正整数。
结合第二方面或第一种实施方式或第二种实施方式或第三种实施方式,在第二方面的第四种实施方式中,所述无线兼容模块包括:
CPRI帧还原单元,用于对所述CPRI控制字和所述第二数据依次进行CPRI帧还原;
编码单元,用于对经过CPRI帧还原后的数据进行编码,将得到所述第一数据发送给所述RRU。
结合第二方面或第一种实施方式或第二种实施方式或第三种实施方式或第四种实施方式,在第二方面的第五种实施方式中,所述频率解聚合模块包
括:
串并变换单元,用于对所述数据信号进行串行数据到并行数据的变换;
快速傅里叶变换FFT单元,用于对经过串并变换的数字信号进行FFT变换;
反快速傅里叶变换IFFT单元,用于对经过FFT变换的数字信号进行IFFT变换,得到所述第三数据和所述控制帧。
第三方面,本发明实施例还提供一种无线前传无源光网络PON系统,包括基带处理单元BBU,如上第一方面所述的光线路终端OLT,光分配网络ODN,如上第二方面所述的光网络单元ONU,以及射频拉远单元RRU;
所述BBU通过其上的通用公共无线电接口CPRI与所述OLT通信;RRU通过其上的CPRI接口与所述ONU通信。
第四方面,本发明实施例还提供一种无线前传无源光网络PON方法,包括:
从基带处理单元BBU中接收的第一数据;
对所述第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字;
对所述第二数据进行数据压缩处理,得到第三数据;并将CPRI控制字和接入网控制字,组成控制帧;
对所述第三数据和所述控制帧进行频率聚合处理;
对经过频率聚合处理后的数据进行数模转换,得到模拟信号;
对所述模拟信号调制为光信号后发送给光分配网络ODN。
结合第四方面,在第一方面的第一种实施方式中,所述对所述第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字,具体包括:
对所述第一数据进行解码;
对经过解码的第一数据进行串行数据到并行数据的变换,得到相互正交的两路数据;
分别对所述相互正交的两路数据进行CPRI控制字提取,得到CPRI控制字和包括两路正交数据的所述第二数据。
结合第四方面,在第四方面的第一种实施方式中,所述将CPRI控制字
和接入网控制字,组成控制帧之后,还包括:
对所述控制帧进行FEC编码。
结合第二种实施方式,在第四方面的第三种实施方式中,所述对所述控制帧进行FEC编码之后,还包括:对经过所述FEC编码后的控制帧进行高阶调制;在经过高阶调制后的控制帧中加入训练序列后再进行频率聚合处理。
结合第四方面或第一种实施方式或第二种实施方式或第三种实施方式,在第四方面的第四种实施方式中,所述对所述第二数据进行数据压缩处理,得到第三数据,具体包括:
所述第二数据进行星座图重组,得到所述第三数据。
结合第四方面或第一种实施方式或第二种实施方式或第三种实施方式或第四种实施方式,在第四方面的第五种实施方式中,所述对所述第三数据和所述控制帧进行频率聚合处理,具体包括:
分别对所述第三数据和所述控制帧进行FFT变换;
对经过FFT变换后的第三数据和控制帧进行IFFT变换;
对经过IFFT变换的第三数据和控制帧进行并行数据到串行数据的变换后发送给所述ODN。
第五方面,本发明实施例还提供一种无线前传无源光网络PON方法,包括:
接收光分配网络ODN发送的光信号,并将所述光信号转换为模拟信号;
将所述模拟信号转换为数字信号;
对所述数字信号进行频率解聚合处理,得到第三数据和控制帧;
对所述第三数据进行解压缩,得到第二数据;
在所述控制帧提取接入网控制字,得到通用公共无线电接口CPRI控制字;
对所述CPRI控制字和所述第二数据依次进行CPRI帧还原和编码操作,得到第一数据;
将所述第一数据发送给射频拉远单元RRU。
结合第五方面,在第一方面的第一种实施方式中,所述对所述数字信号进行频率解聚合处理,得到第三数据和控制帧之后,还包括:
对所述控制帧进行信道补偿处理和前向纠错FEC编码处理,得到信道的
误码率BER信息。
结合第五方面或第一种实施方式,在第五方面的第二种实施方式中,所述对所述CPRI控制字和所述第二数据进行编码操作,具体包括:
根据BER与阈值的大小关系,对编码进行加扰。
结合第二种实施方式,在第五方面的第三种实施方式中,所述根据BER与阈值的大小关系,对编码进行加扰,具体包括:
若原始编码比特之和大于设定阈值n,则在第n比特后添加1并且在最后一个比特之后添加1;或者,若原始编码比特之和小于设定阈值n,则在第n比特后添加0并且在最后一个比特之后添加0,其中n为大于1的正整数。
结合第五方面或第一种实施方式或第二种实施方式或第三种实施方式,在第五方面的第四种实施方式中,所述对所述CPRI控制字和所述第二数据依次进行CPRI帧还原和编码操作,得到第一数据,具体包括:
对所述CPRI控制字和所述第二数据依次进行CPRI帧还原;
对经过CPRI帧还原后的数据进行编码,将得到所述第一数据发送给所述RRU。
结合第五方面或第一种实施方式或第二种实施方式或第三种实施方式或第四种实施方式,在第五方面的第五种实施方式中,所述对所述数字信号进行频率解聚合处理,得到第三数据和控制帧,具体包括:
对所述数据信号进行串行数据到并行数据的变换;
对经过串并变换的数字信号进行FFT变换;
对经过FFT变换的数字信号进行IFFT变换,得到所述第三数据和所述控制帧。
本发明实施例提供的无线前传无源光网络PON系统、光网络设备及方法,通过OLT对从BBU的CPRI接口接收到的数据进行无线兼容处理后分成数据部分和控制字部分,可以对这两部分进行分别处理,从而可以尽可能的压缩数据部分而降低前传带宽,提高了传输效率。
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面
描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明提供的无线前传无源光网络PON系统一个实施例的结构示意图;
图2为本发明提供的光线路终端OLT一个实施例的结构示意图;
图3为本发明提供的光线路终端OLT又一个实施例的结构示意图;
图4为本发明提供的光网络单元ONU的一个实施例的结构示意图;
图5为本发明提供的光网络单元ONU又一个实施例的结构示意图;
图6为本发明提供的8B/10B编码示意图;
图7为本发明提供的一种无线前传无源光网络PON方法一个实施例的流程图;
图8为本发明提供的又一种无线前传无源光网络PON方法一个实施例的流程图。
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
图1为本发明提供的无线前传无源光网络PON系统一个实施例的结构示意图,如图1,该无线前传PON系统包括:BBU,光线路终端(Optical Line Terminate,OLT),光分配网络(Optical Distribution Network,ODN),光网络单元(Optical Network Unit,ONU),以及射频拉远单元RRU;
其中,BBU通过其上的CPRI与OLT通信;RRU通过其上的CPRI接口与ONU通信。
本发明中,通过对已有的OLT设备进行改进,相应的,对已有的ONU设备进行改进实现降低前传带宽,提高传输效率。其具体的改进内容将在下面的设备及方法实施例中进行详细阐述。需要说明的是,本发明中,对于每个OLT而言,可以支持大量的BBU,也就是说每个OLT可以同时与多个BBU通信;类似的,对于每个ONU而言,也可以支持大量的RRU,即可以同时
与多个RRU通信。
图2为本发明提供的光线路终端OLT一个实施例的结构示意图,如图2所示,该设备包括:
CPRI接口20,用于从基带处理单元BBU中接收的第一数据;
无线兼容模块21,用于第一数据依次进行解码和通用公共无线电接口CPRI控制字提取操作,得到第二数据和CPRI控制字;
数据压缩模块22,用于对第二数据进行数据压缩处理,得到第三数据;
成帧模块23,用于将CPRI控制字和接入网控制字组成新的控制帧;
频率聚合模块24,用于对第三数据和控制帧进行频率聚合处理;
数模转换模块25,还用于对经过频率聚合处理后的数据进行数模转换,得到模拟信号;
光发射器26,用于对模拟信号调制为光信号后发送给光分配网络ODN。
需要说明的是,本发明中涉及的BBU,可以集中设置。而RRU可以设置在远端的基站上。
需要说明的是,BBU发给用户设备(User Equipment,UE)的为I/Q数据,也就是相互正交的两路数据,其中I路数据和Q路数据各有15个比特,BBU在I路数据和Q数据中又各加1个比特的CPRI协议控制字,因此I路数据和Q路数据各有16个比特,总比特数为32比特。BBU在对该2路数据进行并串变换后,得到32个比特的串行数据,该数据通过BBU的CPRI接口发送给OLT。
由于OLT为有线接入网中的设备,而CPRI控制字无法对接入网设备进行管理,因此,需要通过无线兼容模块21对来从CPRI接口20接收的第一数据进行无线兼容处理。主要包括与BBU处的编码相对应的解码处理以及CPRI控制字提取处理。
其中,CPRI控制字提取处理目的是将第一数据分成为数据部分和控制字部分,并在后续分别进行处理。其中,得到的数据部分,即第二数据由数据压缩模块22进行压缩处理,从而最大程度上降低了前传的带宽。提取出来的控制字部分需要进一步加入接入网控制字,例如:PON管理控制字,为了在传输过程中保证所有控制字不出错,进一步的,还可以对所有的控制字进行特殊的保护处理(如FEC)得到控制帧。
数据部分和控制字部分分别进行处理后,再由频率聚合模块24,进行频率聚合成一路数据,再经过模数转换和调制后发送给ODN,由ODN发送给ONU。
本发明实施例提供的光线路终端OLT,对从BBU的CPRI接口接收到的数据进行无线兼容处理后分成数据部分和控制字部分,可以对这两部分进行分别处理,从而可以尽可能的压缩数据部分而降低前传带宽,提高了传输效率。
图3为本发明提供的光线路终端OLT又一个实施例的结构示意图,如图3所示,在图2所示实施例的基础上:
对于一种较佳的实施方式,数据压缩模块具体用于:第二数据进行星座图重组,还原出无线信号原始的基带模拟信息(比如原始的是20MHz带宽的LTE信号,数据速率=1.228Gb/s,经过数据压缩模块后,高速信号还原成只占20MHz带宽的模拟信号,得到高达40倍压缩效率)得到第三数据。通过这种数据压缩方式可最大程度地降低前传带宽。
进一步的,为了避免CPRI控制字在传输的过程中出错,该设备还可以包括:前向纠错FEC模块27,用于对控制帧进行FEC编码。
高阶调制模块28,用于对经过FEC编码后的控制帧进行高阶调制。TS处理模块29,用于在经过高阶调制后的控制帧中加入训练序列后输入至频率聚合模块24。
另外,在图2所示实施例的基础上,本实施例还提供了无线兼容模块21的一种较佳的实施方式,可以包括:
解码单元211,用于对第一数据进行解码;
串并转换单元212,用于对经过解码的第一数据进行串行数据到并行数据的变换,得到相互正交的两路数据;
CPRI解帧单元213,用于分别对相互正交的两路数据进行CPRI控制字提取,得到CPRI控制字和包括两路正交数据的第二数据。
更进一步的,在图2所示实施例的基础上,本实施例还提供了频率聚合模块24的一种较佳的实施方式,可以包括:
快速傅里叶变换FFT单元241,用于分别对第三数据和控制帧进行FFT
变换;其中,可以包括多个FFT单元241,以对多路第三数据和控制帧进行FFT变换。
反快速傅里叶变换IFFT单元242,用于对经过FFT变换后的第三数据和控制帧进行IFFT变换;
并串变换单元243,用于对经过IFFT变换的第三数据和控制帧进行并行数据到串行数据的变换,经过数模转换模块和光发射模块后发送给ODN。
以BBU设备输出一路20MHz带宽的长期演进(Long term evolution,LTE)信号为例,在BBU处I路信号和Q路信号各有15个比特,速率30.72MS/s。各自加上一个比特的CPRI控制字后总比特数为32比特。经过串并变换后速率也相应提高32倍,变成30.72×32=983.4Mb/s。这个数据流再经过编码,例如:8B/10B编码后,得到标准CPRI速率1.228Gb/s输出。
在OLT处,解码单元211首先进行相应的解码,例如:8B/10B解码,得到983.4Mb/s的数据流。串并转换单元212再进行串/并变换还原出16比特I和16比特Q。CPRI解帧单元213再提取出控制字。对于第二数据进行星座图重组后其带宽压缩了15倍,得到原始30.72MS/s信号后,进入频率聚合模块。频率聚合模块24的处理后输出的信号带宽为20MHz,相比于现有的1.228G带宽,得到了大幅降低,得到高达40倍压缩效率。
需要说明的是,上述描述了一路1.228Gb/s LTE信号经过变换后压缩为带宽20MHz的信号,可以理解的是,该OLT还可以同时处理N(N为大于1的正整数)路信号,则频率聚合模块最终输出的总带宽为20MHz×N,所需带宽始终保证相同的带宽压缩效率。带宽压缩同时也降低了所需光纤数量。
本发明实施例提供的光线路终端OLT,对从BBU的CPRI接口接收到的数据进行无线兼容处理后分成数据部分和控制字部分,可以对这两部分进行分别处理,为了避免控制字部分传输错误,可以对控制字部分进行纠错处理。对于数据部分可以进行星座图重组来压缩数据,从而可以尽可能的压缩数据部分而降低前传带宽,提高传输效率,降低所需光电器件的带宽和所需前传光纤数量,大幅降低网络投资和运维成本。
图4为本发明提供的光网络单元ONU的一个实施例的结构示意图,如图4所示,该设备包括:
光接收器41,用于接收光分配网络ODN发送的光信号,并将光信号转换为模拟电信号;
模数转换模块42,用于将模拟信号转换为数字信号;
频率解聚合模块43,用于对数字信号进行频率解聚合处理,得到第三数据和控制帧;
比特重组模块44,用于对第三数据进行解压缩,得到第二数据;
解帧模块45,用于在控制帧提取接入网控制字和CPRI控制字;
无线兼容模块46,用于对CPRI控制字和第二数据依次进行CPRI帧还原和编码操作,得到第一数据。
CPRI接口47,用于将该第一数据发送给射频拉远单元RRU。
需要说明的是,OLT发出的光信号经过ODN发送给ONU,ONU中的处理过程基本上为OLT中处理的反向操作。
具体的:由于在OLT设备中对于数据部分和控制字部分进行了分别处理后合成为一路数据,因此,相应的,在ONU中,通过频率解聚合模块43的频率解聚合处理得到第三数据和控制帧。
在OLT设备中对第二数据进行了压缩处理来降低前传带宽,相应的,在ONU中需要进行数据部分的解压缩还原,比特重组模块44经过解压缩处理得到第二数据。在OLT设备中对CPRI控制字中加入了接入网控制字,相应的,OLT中的解帧模块45从在控制帧提取接入网控制字和CPRI控制字。
最后,无线兼容模块46对CPRI控制字和第二数据依次进行CPRI帧还原和编码操作得到原始的第一数据后,通过CPRI接口47发送RRU的CPRI接口。
RRU设备经过与BBU反向的解码操作,例如:8B/10B解码,串并变换操作,中频(IF)处理和数模转换等过程后通过天线发送给UE。
本发明实施例提供的光网络单元ONU,由于在OLT处对从BBU的CPRI接口接收到的数据进行无线兼容处理后分成数据部分和控制字部分,可以对这两部分进行分别处理,从而可以尽可能的压缩数据部分而降低前传带宽。ONU与OLT设备相配合执行OLT设备的反向处理操作,提高了传输效率。
图5为本发明提供的光网络单元ONU又一个实施例的结构示意图,如图
5所示,在图4所示实施例的基础上:
经过CPRI帧重组后,就得到了原始BBU设备发送的CPRI帧,为了与现有RRU设备的CPRI口对接,这里需要再进行8B/10B编码,但如果只进行通常的8B/10B编码,RRU设备在接收到信息时,永远不会检测到8B/10B解码错误,但实际情况并非如此,所以我们在这里引入创新的基于BER的8B/10B编码模块。
具体的,为了降低传输过程中的误码率,还可以信道补偿模块47,用于对控制帧进行信道补偿处理和前向纠错FEC编码处理,得到信道的误码率BER信息。
相应的,无线兼容模块46具体用于:根据BER与阈值的大小关系,对编码进行加扰。
具体的,可以基于BER,设置一个适当的BER阈值BERth,当BER<BERth时,则可以采用正常的8B/10B编码;当BER》BERth时,则可以采用引入干扰的8B/10B编码。
因此,无线兼容模块46可以具体用于:若原始编码比特之和大于设定阈值n,则在第n比特后添加1并且在最后一个比特之后添加1;或者,若原始编码比特之和小于设定阈值n,则在第n比特后添加0并且在最后一个比特之后添加0。其中,对于8B/10B编码而言,一般n可以取4。
以8B/10B编码为例进行说明,参见图6,当原始8个比特的和>4时,引入干扰的8B/10B编码输出为原始8个比特在第四个比特后添加1,在最后一个比特后添加1;或者,当原始8个比特的和<4时,引入干扰的8B/10B编码输出为原始8个比特在第四个比特后添加0,在最后一个比特后添加0。
进一步的,在图4所示实施例的基础上,本实施例还进一步提供了无线兼容模块46的具体实施方式,可以包括:
CPRI帧还原单元461,用于对CPRI控制字和第二数据依次进行CPRI帧还原;
编码单元462,用于对经过CPRI帧还原后的数据进行编码,将得到第一数据发送给RRU。
在图4所示实施例的基础上,本实施例还进一步提供了频率解聚合模块43的具体实施方式,频率解聚合模块43包括:
串并变换单元431,用于对数据信号进行串行数据到并行数据的变换;
快速傅里叶变换FFT单元432,用于对经过串并变换的数字信号进行FFT变换;
反快速傅里叶变换IFFT单元433,用于对经过FFT变换的数字信号进行IFFT变换,得到第三数据和控制帧。
本发明实施例提供的光网络单元ONU,由于在OLT处对从BBU的CPRI接口接收到的数据进行无线兼容处理后分成数据部分和控制字部分,可以对这两部分进行分别处理,从而可以尽可能的压缩数据部分而降低前传带宽。ONU与OLT设备相配合执行OLT设备的反向处理操作,提高了传输效率。另外,本实施例提供的ONU,可以通过信道补偿的方式生成BER,从而根据BER与阈值的大小关系,对编码进行加扰,保证在数据信息或者CPRI控制字出错的情况下,RRU能够识别出错误信息,并启动相应的错误处理程序。
图7为本发明提供的一种无线前传无源光网络PON方法一个实施例的流程图,如图7所示,该方法包括:
S701、从基带处理单元BBU中接收的第一数据;
S702、对第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字;
S703、对第二数据进行数据压缩处理,得到第三数据;并将CPRI控制字和接入网控制字,组成控制帧;
S704、对第三数据和控制帧进行频率聚合处理;
S705、对经过频率聚合处理后的数据进行数模转换,得到模拟信号;
S706、对模拟信号调制为光信号后发送给光分配网络ODN。
可选的,对第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字,具体可以包括:对第一数据进行解码;对经过解码的第一数据进行串行数据到并行数据的变换,得到相互正交的两路数据;分别对相互正交的两路数据进行CPRI控制字提取,得到CPRI控制字和包括两路正交数据的第二数据。
可选的,将CPRI控制字和接入网控制字,组成控制帧之后,还可以包括:对控制帧进行FEC编码。
可选的,对控制帧进行FEC编码之后,还可以包括:对经过FEC编码后的控制帧进行高阶调制;在经过高阶调制后的控制帧中加入训练序列后再进行频率聚合处理。
可选的,对第二数据进行数据压缩处理,得到第三数据,具体可以包括:第二数据进行星座图重组,得到第三数据。
可选的,对第三数据和控制帧进行频率聚合处理,具体可以包括:分别对第三数据和控制帧进行FFT变换;对经过FFT变换后的第三数据和控制帧进行IFFT变换;对经过IFFT变换的第三数据和控制帧进行并行数据到串行数据的变换后发送给ODN。
本实施例提供的无线前传无源光网络PON方法,与图1到图3所示实施例中的OLT设备相对应,其具体的执行过程及对应的有益效果均可参考图1到图3所示实施例中的相关描述,在此不再赘述。
图8为本发明提供的无线前传无源光网络PON方法又一个实施例的流程图,如图8所示,该方法包括:
S801、接收光分配网络ODN发送的光信号,并将光信号转换为模拟信号;
S802、将模拟信号转换为数字信号;
S803、对数字信号进行频率解聚合处理,得到第三数据和控制帧;
S804、对第三数据进行解压缩,得到第二数据;
S805、在控制帧提取接入网控制字,得到通用公共无线电接口CPRI控制字;
S806、对CPRI控制字和第二数据依次进行CPRI帧还原和编码操作,得到第一数据;
S807、将第一数据发送给射频拉远单元RRU。
可选的,对数字信号进行频率解聚合处理,得到第三数据和控制帧之后,还可以包括:对控制帧进行信道补偿处理和前向纠错FEC编码处理,得到信道的误码率BER信息。
可选的,对CPRI控制字和第二数据进行编码操作,具体可以包括:根据BER与阈值的大小关系,对编码进行加扰。
可选的,根据BER与阈值的大小关系,对编码进行加扰,具体可以包括:
若原始编码比特之和大于设定阈值n,则在第n比特后添加1并且在最后一个比特之后添加1;或者,若原始编码比特之和小于设定阈值n,则在第n比特后添加0并且在最后一个比特之后添加0,其中n为大于1的正整数。
可选的,对CPRI控制字和第二数据依次进行CPRI帧还原和编码操作,得到第一数据,具体可以包括:对CPRI控制字和第二数据依次进行CPRI帧还原;对经过CPRI帧还原后的数据进行编码,将得到第一数据发送给RRU。
可选的,对数字信号进行频率解聚合处理,得到第三数据和控制帧,具体可以包括:对数据信号进行串行数据到并行数据的变换;对经过串并变换的数字信号进行FFT变换;对经过FFT变换的数字信号进行IFFT变换,得到第三数据和控制帧。
本实施例提供的无线前传无源光网络PON方法,与图4到图6所示实施例中的ONU设备相对应,其具体的执行过程及对应的有益效果均可参考图4到图6所示实施例中的相关描述,在此不再赘述。
所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,仅以上述各功能模块的划分进行举例说明,实际应用中,可以根据需要而将上述功能分配由不同的功能模块完成,即将装置的内部结构划分成不同的功能模块,以完成以上描述的全部或者部分功能。上述描述的系统,装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。
在本申请所提供的几个实施例中,应该理解到,所揭露的系统,装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述模块或单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,在本申请各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(ROM,Read-Only Memory)、随机存取存储器(RAM,Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述,以上实施例仅用以说明本申请的技术方案,而非对其限制;尽管参照前述实施例对本申请进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。
Claims (25)
- 一种光线路终端,其特征在于,包括:通用公共无线电接口CPRI接口,用于从基带处理单元BBU中接收的第一数据;无线兼容模块,用于对所述第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字;数据压缩模块,用于对所述第二数据进行数据压缩处理,得到第三数据;成帧模块,将CPRI控制字和接入网控制字,组成控制帧;频率聚合模块,用于对所述第三数据和所述控制帧进行频率聚合处理;数模转换模块,还用于对经过频率聚合处理后的数据进行数模转换,得到模拟信号;光发射器,用于对所述模拟信号调制为光信号后发送给光分配网络ODN。
- 根据权利要求1所述的光线路终端,其特征在于,所述无线兼容模块具体包括:解码单元,用于对所述第一数据进行解码;串并转换单元,用于对经过解码的第一数据进行串行数据到并行数据的变换,得到相互正交的两路数据;CPRI解帧单元,用于分别对所述相互正交的两路数据进行CPRI控制字提取,得到CPRI控制字和包括两路正交数据的所述第二数据。
- 根据权利要求1或2所述的光线路终端,其特征在于,还包括:前向纠错FEC模块,用于对所述控制帧进行FEC编码。
- 根据权利要求3所述的光线路终端,其特征在于,还包括:高阶调制模块,用于对经过所述FEC编码后的控制帧进行高阶调制;TS处理模块,用于在经过高阶调制后的控制帧中加入训练序列后输入至所述聚合模块。
- 根据权利要求1-4任一项所述的光线路终端,其特征在于,所述数据压缩模块具体用于:所述第二数据进行星座图重组,得到所述第三数据。
- 根据权利要求1-5任一项所述的光线路终端,其特征在于,所述聚合模块包括:快速傅里叶变换FFT单元,用于分别对所述第三数据和所述控制帧进行FFT变换;反快速傅里叶变换IFFT单元,用于对经过FFT变换后的第三数据和控制帧进行IFFT变换;并串变换单元,用于对经过IFFT变换的第三数据和控制帧进行并行数据到串行数据的变换后发送给所述ODN。
- 一种光网络单元,其特征在于,包括:光接收器,用于接收光分配网络ODN发送的光信号,并将所述光信号转换为模拟信号;模数转换单元,用于将所述模拟信号转换为数字信号;频率解聚合模块,用于对所述数字信号进行频率解聚合处理,得到第三数据和控制帧;比特重组模块,用于对所述第三数据进行解压缩,得到第二数据;解帧模块,用于在所述控制帧提取接入网控制字,得到通用公共无线电接口CPRI控制字;无线兼容模块,用于对所述CPRI控制字和所述第二数据依次进行CPRI帧还原和编码操作,得到第一数据;CPRI接口,用于将所述第一数据发送给射频拉远单元RRU。
- 根据权利要求7所述的光网络单元,其特征在于,还包括:信道补偿模块,用于对所述控制帧进行信道补偿处理和前向纠错FEC编码处理,得到信道的误码率BER信息。
- 根据权利要求8所述的光网络单元,其特征在于,所述无线兼容模块具体用于:根据BER与阈值的大小关系,对编码进行加扰。
- 根据权利要求9所述的光网络单元,其特征在于,所述无线兼容模块具体用于:若原始编码比特之和大于设定阈值n,则在第n比特后添加1并且在最后一个比特之后添加1;或者,若原始编码比特之和小于设定阈值n,则在第n比特后添加0并且在最后一个比特之后添加0,其中n为大于1的正整数。
- 根据权利要求7-10任一项所述的光网络单元,其特征在于,所述无线兼容模块包括:CPRI帧还原单元,用于对所述CPRI控制字和所述第二数据依次进行CPRI帧还原;编码单元,用于对经过CPRI帧还原后的数据进行编码,将得到所述第一数据发送给所述RRU。
- 根据权利要求7-11任一项所述的光网络单元,其特征在于,所述频率解聚合模块包括:串并变换单元,用于对所述数据信号进行串行数据到并行数据的变换;快速傅里叶变换FFT单元,用于对经过串并变换的数字信号进行FFT变换;反快速傅里叶变换IFFT单元,用于对经过FFT变换的数字信号进行IFFT变换,得到所述第三数据和所述控制帧。
- 一种无线前传无源光网络PON系统,其特征在于,包括基带处理单元BBU,如权利要求1-6任一项所述的光线路终端OLT,光分配网络ODN,如权利要求7-12任一项所述的光网络单元ONU,以及射频拉远单元RRU;所述BBU通过其上的通用公共无线电接口CPRI与所述OLT通信;RRU通过其上的CPRI接口与所述ONU通信。
- 一种无线前传无源光网络PON方法,其特征在于,包括:从基带处理单元BBU中接收的第一数据;对所述第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字;对所述第二数据进行数据压缩处理,得到第三数据;并将CPRI控制字和接入网控制字,组成控制帧;对所述第三数据和所述控制帧进行频率聚合处理;对经过频率聚合处理后的数据进行数模转换,得到模拟信号;对所述模拟信号调制为光信号后发送给光分配网络ODN。
- 根据权利要求14所述的方法,其特征在于,所述对所述第一数据依次进行解码和CPRI控制字提取操作,得到第二数据和CPRI控制字,具体包括:对所述第一数据进行解码;对经过解码的第一数据进行串行数据到并行数据的变换,得到相互正交 的两路数据;分别对所述相互正交的两路数据进行CPRI控制字提取,得到CPRI控制字和包括两路正交数据的所述第二数据。
- 根据权利要求14或15所述的方法,其特征在于,所述将CPRI控制字和接入网控制字,组成控制帧之后,还包括:对所述控制帧进行FEC编码。
- 根据权利要求16所述的方法,其特征在于,所述对所述控制帧进行FEC编码之后,还包括:对经过所述FEC编码后的控制帧进行高阶调制;在经过高阶调制后的控制帧中加入训练序列后再进行频率聚合处理。
- 根据权利要求14-17任一项所述的方法,其特征在于,所述对所述第二数据进行数据压缩处理,得到第三数据,具体包括:所述第二数据进行星座图重组,得到所述第三数据。
- 根据权利要求14-18任一项所述的方法,其特征在于,所述对所述第三数据和所述控制帧进行频率聚合处理,具体包括:分别对所述第三数据和所述控制帧进行FFT变换;对经过FFT变换后的第三数据和控制帧进行IFFT变换;对经过IFFT变换的第三数据和控制帧进行并行数据到串行数据的变换后发送给所述ODN。
- 一种无线前传无源光网络PON方法,其特征在于,包括:接收光分配网络ODN发送的光信号,并将所述光信号转换为模拟信号;将所述模拟信号转换为数字信号;对所述数字信号进行频率解聚合处理,得到第三数据和控制帧;对所述第三数据进行解压缩,得到第二数据;在所述控制帧提取接入网控制字,得到通用公共无线电接口CPRI控制字;对所述CPRI控制字和所述第二数据依次进行CPRI帧还原和编码操作,得到第一数据;将所述第一数据发送给射频拉远单元RRU。
- 根据权利要求20所述的方法,其特征在于,所述对所述数字信号进 行频率解聚合处理,得到第三数据和控制帧之后,还包括:对所述控制帧进行信道补偿处理和前向纠错FEC编码处理,得到信道的误码率BER信息。
- 根据权利要求21所述的方法,其特征在于,所述对所述CPRI控制字和所述第二数据进行编码操作,具体包括:根据BER与阈值的大小关系,对编码进行加扰。
- 根据权利要求22所述的方法,其特征在于,所述根据BER与阈值的大小关系,对编码进行加扰,具体包括:若原始编码比特之和大于设定阈值n,则在第n比特后添加1并且在最后一个比特之后添加1;或者,若原始编码比特之和小于设定阈值n,则在第n比特后添加0并且在最后一个比特之后添加0,其中n为大于1的正整数。
- 根据权利要求20-23任一项所述的方法,其特征在于,所述对所述CPRI控制字和所述第二数据依次进行CPRI帧还原和编码操作,得到第一数据,具体包括:对所述CPRI控制字和所述第二数据依次进行CPRI帧还原;对经过CPRI帧还原后的数据进行编码,将得到所述第一数据发送给所述RRU。
- 根据权利要求20-24任一项所述的方法,其特征在于,所述对所述数字信号进行频率解聚合处理,得到第三数据和控制帧,具体包括:对所述数据信号进行串行数据到并行数据的变换;对经过串并变换的数字信号进行FFT变换;对经过FFT变换的数字信号进行IFFT变换,得到所述第三数据和所述控制帧。
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| EP14909395.7A EP3242418B1 (en) | 2014-12-30 | 2014-12-30 | Wireless fronthaul passive optical network (pon) system, optical network device and method |
| CN201480037530.1A CN106170934B (zh) | 2014-12-30 | 2014-12-30 | 无线前传无源光网络pon系统、光网络设备及方法 |
| PCT/CN2014/095631 WO2016106584A1 (zh) | 2014-12-30 | 2014-12-30 | 无线前传无源光网络pon系统、光网络设备及方法 |
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| CN106534006A (zh) * | 2016-10-25 | 2017-03-22 | 孔令斌 | 一种通用公共无线接口信息的处理系统和方法 |
| CN107846417A (zh) * | 2017-12-13 | 2018-03-27 | 天津光电通信技术有限公司 | 一种基于fpga的cpri自适应解码系统及实现方法 |
| WO2019051868A1 (en) * | 2017-09-15 | 2019-03-21 | Huawei Technologies Co., Ltd. | ORDERING AND MANAGING A FIRST PON USING A SECOND PON |
| WO2020253628A1 (zh) * | 2019-06-19 | 2020-12-24 | 华为技术有限公司 | 一种数据处理方法、光传输设备及数字处理芯片 |
| CN115314109A (zh) * | 2022-04-12 | 2022-11-08 | 中国人民解放军战略支援部队航天工程大学 | 一种用fpga实现的多通道光纤传输 |
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| CN112118069B (zh) * | 2019-06-20 | 2023-05-05 | 中国移动通信有限公司研究院 | 前传网络的管控方法及网络设备 |
| CN110418219B (zh) * | 2019-07-30 | 2021-09-07 | 南京信息工程大学 | 一种基于星座压缩的pon动态带宽分配系统及方法 |
| CN114765704B (zh) * | 2021-01-15 | 2024-11-08 | 中国移动通信有限公司研究院 | 家庭基站网络系统及应用于其的上行传输带宽分配方法 |
| CN116489539A (zh) * | 2022-08-16 | 2023-07-25 | 中兴通讯股份有限公司 | 下行帧长的处理方法及装置、存储介质、电子装置 |
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| CN106170934B (zh) | 2019-06-21 |
| EP3242418A4 (en) | 2018-01-10 |
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