CN103856836A - Method for sending user data in passive optical network (PON), method for receiving user data in PON, system for sending and receiving user data in PON, and equipment - Google Patents
Method for sending user data in passive optical network (PON), method for receiving user data in PON, system for sending and receiving user data in PON, and equipment Download PDFInfo
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Abstract
The invention discloses a method for sending user data in a passive optical network (PON). The method comprises the following steps: a transmission convergence (TC) layer of a sending end encapsulates user data into a multi-frame; and a physical medium dependent (PMD) layer of the sending end performs frequency division multiplexing (FDM) modulation on the multi-frame and sends the FDM modulated multi-frame to a receiving end through an optical fiber. The invention further discloses a method for receiving user data in a PON, a system for sending and receiving user data in a PON, and a piece of equipment. According to the scheme of the invention, user data transmission of any granularity can be realized.
Description
Technical field
The present invention relates to the sending and receiving technology of user data, relate in particular to the method for sending and receiving of user data in a kind of EPON and system, equipment.
Background technology
Frequency division multiplexing (FDM) technology comprises OFDM (OFDM) technology, OFDM technology is assigned to the bit information of high speed serialization on the mutually orthogonal subcarrier of each frequency spectrum dynamically, each subcarrier adopts the contour rank of quadrature amplitude modulation (QAM) modulating mode simultaneously, effectively the spectrum efficiency of elevator system.The data-signal duration of light OFDM symbol on each subcarrier increases relatively, add the employing of Cyclic Prefix technology, thereby effectively overcome the intersymbol interference that chromatic dispersion in optical fiber link and polarization mode dispersion bring.
OFDM PON network topology structure as shown in Figure 1, comprises optical line unit (OLT), optical network unit (ONU) and optical distribution network (ODN).The protocol layer architecture of OLT and ONU as shown in Figure 2, user data from upper strata customer data layer carries out OFDM modulation at OFDM medium Dependent Layer (PMD) after the framing adaptation of Transmission Convergence (TC) layer, then via arriving ONU after Optical Fiber Transmission.The OFDM pmd layer of ONU carries out after OFDM demodulation, transfers to customer data layer processing after recovering customer data in TC layer.
Transmitting terminal OFDM pmd layer structure as shown in Figure 3, comprises data sending processing unit and light transmission processing unit, and data sending processing unit comprises Digital Signal Processing (DSP) module, D/A converter module, IQ modulation and up-converter module.In DSP module, comprise serial/parallel modular converter, QAM mapping block and inverse fast fourier transform (IFFT) module.The high-speed serial data that comes from upper strata processing unit enters after DSP module, first carry out serial/parallel conversion, converting high-speed serial is become to multidiameter delay low speed data, the corresponding subcarrier of every road low speed data, after serial/parallel conversion, every circuit-switched data is through the mapping of QAM mapping block, form a complex points of planisphere, each complex points is modulated on a subcarrier, after the modulation of IFFT module, multidiameter delay data are modulated on corresponding subcarrier, complete the conversion of frequency domain to time domain, export digital OFDM baseband signal, be divided into homophase (In-phase) and orthogonal (Quadrature) two components, real part and the imaginary part of corresponding symbol respectively, DSP module converts digital OFDM baseband signal to simulation OFDM baseband signal, send into IQ modulation and up-converter module, IQ modulation and up-converter module are modulated to homophase and quadrature component respectively on radio-frequency carrier, complete rf modulations, finally, radiofrequency signal is sent into laser and is emitted to receiving terminal to light carrier by light transmission processing cells modulate.
Receiving terminal OFDM pmd layer structure as shown in Figure 4, comprises light-receiving processing unit and data receiver processing unit, and data receiver processing unit comprises down-conversion and IQ demodulation module, analog-to-digital conversion module and digital signal (DSP) processing module.In DSP module, comprise fast Fourier transform (FFT) module, QAM demapping module and parallel/serial modular converter.Radiofrequency signal from optical fiber converts the analog radio frequency signal of telecommunication to through light-receiving processing unit.Radiofrequency signal is through down-conversion and the demodulation of IQ demodulation module, form simulation OFDM baseband signal, be divided into homophase and orthogonal two-way component, simulation OFDM baseband signal is through analog-to-digital conversion module, be converted to digital OFDM baseband signal, and send into DSP resume module, first DSP module does fast Fourier transform to digital OFDM baseband signal, complete the conversion of time domain to frequency domain, recover the data symbol being modulated on each subcarrier, export reception & disposal unit, upper strata to through QAM demapping module and parallel/serial modular converter recovery high-speed data afterwards.
In current passive optical network, TC framing layer carries out sending and receiving using physical layer as an integral passage, the physical layer of receiving terminal and TC layer are processed all reception data, and select to filter according to the address information of the packet receiving, be unfavorable for realizing the user data transmission of any granularity.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method for sending and receiving of user data in a kind of EPON and system, equipment, can realize the user data transmission of any granularity.
For achieving the above object, technical scheme of the present invention is achieved in that
The sending method of user data in a kind of EPON provided by the invention, the method comprises:
User data is packaged into multi-frame by Transmission Convergence (TC) layer of transmitting terminal; The medium Dependent Layer (PMD) of transmitting terminal carries out frequency division multiplexing (FDM) modulation to described multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal.
In such scheme, the TC layer of described transmitting terminal is packaged into multi-frame by user data and is:
It is adaptive that transmitting terminal carries out EPON packaged type (GEM) encapsulation by the Service Data Unit of customer data layer in the adaptive sublayer of business of TC layer, obtains different GEM groupings, and each GEM grouping is added to GEM packets headers; In the framing sublayer of TC layer,, be encapsulated in a multi-frame subframe payload arranged together the GEM grouping that need to transmit in same subchannel according to the address information of GEM packets headers, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload; Each multi-frame subframe is merged in a multi-frame.
In such scheme, the method also comprises: described TC layer is by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe and finish Frequency point and notify pmd layer by data-interface.
In such scheme, the pmd layer of described transmitting terminal carries out FDM to multi-frame and is modulated to: the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length of each multi-frame subframe that the pmd layer of described transmitting terminal sends by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
In such scheme, describedly notify pmd layer by data-interface, comprise in-band method or out-band method notice pmd layer;
Described in-band method notice pmd layer is by data field notice pmd layer special in multi-frame frame structure;
Described out-band method notice pmd layer is the internal data interface notice pmd layer by EPON, does not take real data passage.
In such scheme, described transmitting terminal is optical line unit (OLT) or optical network unit (ONU).
The method of reseptance of user data in a kind of EPON provided by the invention, the method comprises:
The pmd layer of receiving terminal receives the multi-frame after FDM modulation via optical fiber, and carries out FDM demodulation;
The multi-frame decapsulation of the TC layer of receiving terminal after to demodulation obtains user data.
In such scheme, described FDM is demodulated into: according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame.
In such scheme, the multi-frame decapsulation of the TC layer of described receiving terminal after to demodulation obtains user data and is: the multi-frame after described demodulation is each multi-frame subframe, receiving terminal is in the framing sublayer of TC layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
In such scheme, described reception configuration sends to receiving terminal by transmitting terminal by management channels.
In such scheme, described receiving terminal is ONU or OLT.
The sending and receiving system of user data in a kind of EPON provided by the invention, this system comprises: transmitting terminal and receiving terminal, wherein,
Transmitting terminal, is packaged into multi-frame for the TC layer at self by user data, at the pmd layer of self, multi-frame is carried out to FDM modulation, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal;
Receiving terminal, receives the multi-frame after FDM modulation for the pmd layer at self via optical fiber, and carries out FDM demodulation; Multi-frame decapsulation after self TC layer is to demodulation obtains user data.
In such scheme, described transmitting terminal comprises: encapsulation unit and modulation sending unit, wherein,
Encapsulation unit, is packaged into multi-frame for the TC layer at transmitting terminal by user data;
Modulation sending unit, carries out FDM modulation for the pmd layer at transmitting terminal to multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal.
In such scheme, described encapsulation unit, adaptive specifically for the Service Data Unit of the customer data layer of transmitting terminal is carried out to GEM encapsulation in the adaptive sublayer of business of TC layer, obtain different GEM groupings, each GEM grouping is added to GEM packets headers; In the framing sublayer of TC layer,, be encapsulated in a multi-frame subframe payload arranged together the GEM grouping that need to transmit in same subchannel according to the address information of GEM packets headers, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload; Each multi-frame subframe is merged in a multi-frame.
In such scheme, described encapsulation unit, also for by TC layer by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe with finish Frequency point and notify pmd layer by data-interface.
In such scheme, described modulation sending unit, specifically in the pmd layer of transmitting terminal, the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length of the each multi-frame subframe sending by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
In such scheme, described receiving terminal comprises: receiving demodulation unit and decapsulation unit, wherein,
Receiving demodulation unit, receives the multi-frame after FDM modulation for the pmd layer at receiving terminal via optical fiber, and carries out FDM demodulation;
Decapsulation unit, the multi-frame decapsulation for the TC layer at receiving terminal after to demodulation obtains user data.
In such scheme, described receiving demodulation unit, specifically in the pmd layer of receiving terminal, according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame.
In such scheme, described decapsulation unit, specifically in the framing sublayer of the TC of receiving terminal layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
In such scheme, described reception configuration is sent to the receiving demodulation unit of receiving terminal by management channels by transmitting terminal.
Transmitting terminal in a kind of EPON provided by the invention, described transmitting terminal comprises: encapsulation unit and modulation sending unit, wherein,
Encapsulation unit, is packaged into multi-frame for the TC layer at transmitting terminal by user data;
Modulation sending unit, carries out FDM modulation for the pmd layer at transmitting terminal to multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal.
Receiving terminal in a kind of EPON provided by the invention, described receiving terminal comprises: receiving demodulation unit and decapsulation unit, wherein,
Receiving demodulation unit, receives the multi-frame after FDM modulation for the pmd layer at receiving terminal via optical fiber, and carries out FDM demodulation;
Decapsulation unit, the multi-frame decapsulation for the TC layer at receiving terminal after to demodulation obtains user data.
The invention provides the method for sending and receiving of user data in a kind of EPON and system, equipment, user data is packaged into multi-frame by the TC layer of transmitting terminal; The pmd layer of transmitting terminal carries out FDM modulation to multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal; The pmd layer of receiving terminal receives the multi-frame after FDM modulation via optical fiber, and the multi-frame of FDM modulation is carried out to demodulation; The multi-frame decapsulation of the TC layer of receiving terminal after to demodulation obtains user data; So, can realize the user data transmission of any granularity.
Accompanying drawing explanation
Fig. 1 is the OFDM PON network topology structure schematic diagram of prior art;
Fig. 2 is the OLT of prior art and the protocol layer architecture schematic diagram of ONU;
Fig. 3 is the transmitting terminal OFDM pmd layer structural representation of prior art;
Fig. 4 is the receiving terminal OFDM pmd layer structural representation of prior art;
Fig. 5 is the schematic flow sheet of the sending method of user data in EPON provided by the invention;
Fig. 6 is the schematic flow sheet that the TC layer of transmitting terminal of the present invention is packaged into user data multi-frame;
Fig. 7 is the frame head structural representation of multi-frame of the present invention;
Fig. 8 is the schematic flow sheet of the method for reseptance of user data in EPON provided by the invention;
Fig. 9 is the structural representation of the sending and receiving system of user data in EPON provided by the invention.
Embodiment
Basic thought of the present invention is: user data is packaged into multi-frame by the TC layer of transmitting terminal; The pmd layer of transmitting terminal carries out FDM modulation to multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal; The pmd layer of receiving terminal receives the multi-frame after FDM modulation via optical fiber, and the multi-frame of FDM modulation is carried out to demodulation; The multi-frame decapsulation of the TC layer of receiving terminal after to demodulation obtains user data.
Below by drawings and the specific embodiments, the present invention is described in further detail.
The present invention realizes the sending method of user data in a kind of EPON, and as shown in Figure 5, the method comprises following step:
Step 101: user data is packaged into multi-frame by the TC layer of transmitting terminal;
Concrete, as shown in Figure 6, transmitting terminal carries out EPON packaged type (GEM by the Service Data Unit of customer data layer (SDU) in the adaptive sublayer of business of TC layer, GPON EncapsulationMethod) encapsulation adaptation, obtain different GEM groupings, each GEM grouping is added to GEM packets headers H; In the framing sublayer of TC layer, according to the address information of GEM packets headers, each GEM grouping is reordered or dispatched, arranged together in order the GEM grouping that need to transmit in same subchannel, be encapsulated in a multi-frame subframe payload, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload, described multi-frame subframe frame head is for transmitting the common control information of subchannel used; Each multi-frame subframe is merged in a multi-frame; Described multi-frame takies 125 microseconds;
This step also comprises: the TC layer of transmitting terminal is by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe and finish Frequency point and notify pmd layer by data-interface.
Describedly notify pmd layer by data-interface, comprise in-band method or out-band method notice pmd layer;
Described in-band method notice pmd layer is by data field notice pmd layer special in multi-frame frame structure; Described out-band method notice pmd layer is the internal data interface notice pmd layer by EPON, does not take real data passage;
In described multi-frame frame structure, special data field is generally the frame head of multi-frame, the frame head of described multi-frame as shown in Figure 7, the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length that comprises each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point.
Step 102: the pmd layer of transmitting terminal carries out FDM modulation to multi-frame, the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal;
In this step, the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length of each multi-frame subframe that the pmd layer of described transmitting terminal sends by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
The present invention realizes the method for reseptance of user data in a kind of EPON, and as shown in Figure 8, the method comprises following step:
Step 201: the pmd layer of receiving terminal receives the multi-frame after FDM modulation via optical fiber, carries out FDM demodulation to the multi-frame of FDM modulation;
Described FDM is demodulated into: according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame;
Described reception configuration sends to receiving terminal by transmitting terminal by management channels.
Step 202: the multi-frame decapsulation of the TC layer of receiving terminal after to demodulation obtains user data;
Concrete, multi-frame after described demodulation is each multi-frame subframe of multi-frame, receiving terminal is in the framing sublayer of TC layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
In above-mentioned two embodiment, described transmitting terminal can be OLT or ONU, and described receiving terminal can be ONU or OLT, that is:, when transmitting terminal is OLT, receiving terminal is ONU; When transmitting terminal is ONU, receiving terminal is OLT.
Based on the method for sending and receiving of user data in above-mentioned EPON, the present invention also provides the sending and receiving system of user data in a kind of EPON, and as shown in Figure 9, this system comprises: transmitting terminal 11 and receiving terminal 12, wherein,
Transmitting terminal 11, is packaged into multi-frame for the TC layer at self by user data; Pmd layer at self carries out FDM modulation to multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal 12;
Receiving terminal 12, receives the multi-frame after FDM modulation for the pmd layer at self via optical fiber, and the multi-frame of FDM modulation is carried out to demodulation; Multi-frame decapsulation after self TC layer is to demodulation obtains user data;
Described transmitting terminal 11 comprises: encapsulation unit 111 and modulation sending unit 112, wherein,
Encapsulation unit 111, is packaged into multi-frame for the TC layer at transmitting terminal 11 by user data;
Described encapsulation unit 111, adaptive specifically for the Service Data Unit of the customer data layer of transmitting terminal 11 is carried out to GEM encapsulation in the adaptive sublayer of business of TC layer, obtain different GEM groupings, each GEM grouping is added to GEM packets headers; In the framing sublayer of TC layer, according to the address information of GEM packets headers, the GEM that need to transmit in same subchannel is divided into groups arranged together in order, be encapsulated in a multi-frame subframe payload, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload; Each multi-frame subframe is merged in a multi-frame; Described multi-frame takies 125 microseconds;
Described encapsulation unit 111, also for by TC layer by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe with finish Frequency point and notify pmd layer by data-interface.
Describedly notify pmd layer by data-interface, comprise in-band method or out-band method notice pmd layer;
Described in-band method notice pmd layer is by data field notice pmd layer special in multi-frame frame structure; Described out-band method notice pmd layer is the internal data interface notice pmd layer by EPON, does not take real data passage;
In described multi-frame frame structure, special data field is generally the frame head of multi-frame, the frame head of described multi-frame as shown in Figure 7, the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length that comprises each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point;
Described modulation sending unit 112, specifically in the pmd layer of transmitting terminal 11, the beginning subcarrier of FDM modulation corresponding to the beginning byte of the length of the each multi-frame subframe sending by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish subcarrier, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
Described receiving terminal 12 comprises: receiving demodulation unit 121 and decapsulation unit 122, wherein,
Receiving demodulation unit 121, receives the multi-frame after FDM modulation for the pmd layer at receiving terminal 12 via optical fiber, and the multi-frame of FDM modulation is carried out to FDM demodulation;
Decapsulation unit 122, the multi-frame decapsulation for the TC layer at receiving terminal 12 after to demodulation obtains user data;
Described receiving demodulation unit 121, specifically in the pmd layer of receiving terminal 12, according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame; Described reception configuration is sent to the receiving demodulation unit 121 of receiving terminal 12 by management channels by transmitting terminal 11;
Described decapsulation unit 122, specifically in the framing sublayer of the TC of receiving terminal 12 layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
Based on above-mentioned sending and receiving system, the present invention also provides the transmitting terminal in a kind of EPON, and as shown in Figure 9, described transmitting terminal 11 comprises: encapsulation unit 111 and modulation sending unit 112, wherein,
Encapsulation unit 111, is packaged into multi-frame for the TC layer at transmitting terminal 11 by user data;
Described encapsulation unit 111, adaptive specifically for the Service Data Unit of the customer data layer of transmitting terminal 11 is carried out to GEM encapsulation in the adaptive sublayer of business of TC layer, obtain different GEM groupings, each GEM grouping is added to GEM packets headers; In the framing sublayer of TC layer, according to the address information of GEM packets headers, the GEM that need to transmit in same subchannel is divided into groups arranged together in order, be encapsulated in a multi-frame subframe payload, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload; Each multi-frame subframe is merged in a multi-frame; Described multi-frame takies 125 microseconds;
Described encapsulation unit 111, also for by TC layer by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe with finish Frequency point and notify pmd layer by data-interface.
Describedly notify pmd layer by data-interface, comprise in-band method or out-band method notice pmd layer;
Described in-band method notice pmd layer is by data field notice pmd layer special in multi-frame frame structure;
Described out-band method notice pmd layer is the internal data interface notice pmd layer by EPON, does not take real data passage;
In described multi-frame frame structure, special data field is generally the frame head of multi-frame, the frame head of described multi-frame as shown in Figure 7, the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length that comprises each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point;
Described modulation sending unit 112, specifically in the pmd layer of transmitting terminal 11, the beginning subcarrier of FDM modulation corresponding to the beginning byte of the length of the each multi-frame subframe sending by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish subcarrier, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
Based on above-mentioned sending and receiving system, the present invention also provides the receiving terminal in a kind of EPON, and as shown in Figure 9, described receiving terminal 12 comprises: receiving demodulation unit 121 and decapsulation unit 122, wherein,
Receiving demodulation unit 121, receives the multi-frame after FDM modulation for the pmd layer at receiving terminal 12 via optical fiber, and the multi-frame of FDM modulation is carried out to FDM demodulation;
Decapsulation unit 122, the multi-frame decapsulation for the TC layer at receiving terminal 12 after to demodulation obtains user data;
Described receiving demodulation unit 121, specifically in the pmd layer of receiving terminal 12, according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame; Described reception configuration is sent to the receiving demodulation unit 121 of receiving terminal 12 by management channels by transmitting terminal 11;
Described decapsulation unit 122, specifically in the framing sublayer of the TC of receiving terminal 12 layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
In sum, utilize FDM technology to carry out in the EPON of physical layer modulation demodulation, TC framing adaptation layer can be the subchannel of some variable grain degree according to the different demarcation of frequency by physical layer, and in the time that sending, physical layer sends data according to subchannel, receiving terminal can selective reception at least from the data of a subchannel, and process without the data to all subchannels.And the granularity of subchannel can be adjusted dynamically, thereby realize the scheduling of any granularity, solved the restriction of prior art.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (28)
1. a sending method for user data in EPON, is characterized in that, the method comprises:
User data is packaged into multi-frame by Transmission Convergence (TC) layer of transmitting terminal; The medium Dependent Layer (PMD) of transmitting terminal carries out frequency division multiplexing (FDM) modulation to described multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal.
2. sending method according to claim 1, is characterized in that, the TC layer of described transmitting terminal is packaged into multi-frame by user data and is:
It is adaptive that transmitting terminal carries out EPON packaged type (GEM) encapsulation by the Service Data Unit of customer data layer in the adaptive sublayer of business of TC layer, obtains different GEM groupings, and each GEM grouping is added to GEM packets headers; In the framing sublayer of TC layer,, be encapsulated in a multi-frame subframe payload arranged together the GEM grouping that need to transmit in same subchannel according to the address information of GEM packets headers, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload; Each multi-frame subframe is merged in a multi-frame.
3. sending method according to claim 2, it is characterized in that, the method also comprises: described TC layer is by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe and finish Frequency point and notify pmd layer by data-interface.
4. sending method according to claim 1, it is characterized in that, the pmd layer of described transmitting terminal carries out FDM to multi-frame and is modulated to: the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length of each multi-frame subframe that the pmd layer of described transmitting terminal sends by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
5. sending method according to claim 3, is characterized in that, describedly notifies pmd layer by data-interface, comprises in-band method or out-band method notice pmd layer;
Described in-band method notice pmd layer is by data field notice pmd layer special in multi-frame frame structure;
Described out-band method notice pmd layer is the internal data interface notice pmd layer by EPON, does not take real data passage.
6. sending method according to claim 1, is characterized in that, described transmitting terminal is optical line unit (OLT) or optical network unit (ONU).
7. a method of reseptance for user data in EPON, is characterized in that, the method comprises:
The pmd layer of receiving terminal receives the multi-frame after FDM modulation via optical fiber, and carries out FDM demodulation;
The multi-frame decapsulation of the TC layer of receiving terminal after to demodulation obtains user data.
8. method of reseptance according to claim 7, it is characterized in that, described FDM is demodulated into: according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame.
9. method of reseptance according to claim 7, it is characterized in that, the multi-frame decapsulation of the TC layer of described receiving terminal after to demodulation obtains user data and is: the multi-frame after described demodulation is each multi-frame subframe, receiving terminal is in the framing sublayer of TC layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
10. method of reseptance according to claim 8, is characterized in that, described reception configuration sends to receiving terminal by transmitting terminal by management channels.
11. method of reseptances according to claim 7, is characterized in that, described receiving terminal is ONU or OLT.
In 12. 1 kinds of EPONs, the sending and receiving system of user data, is characterized in that, this system comprises: transmitting terminal and receiving terminal, wherein,
Transmitting terminal, is packaged into multi-frame for the TC layer at self by user data, at the pmd layer of self, multi-frame is carried out to FDM modulation, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal;
Receiving terminal, receives the multi-frame after FDM modulation for the pmd layer at self via optical fiber, and carries out FDM demodulation; Multi-frame decapsulation after self TC layer is to demodulation obtains user data.
13. sending and receiving systems according to claim 12, is characterized in that, described transmitting terminal comprises: encapsulation unit and modulation sending unit, wherein,
Encapsulation unit, is packaged into multi-frame for the TC layer at transmitting terminal by user data;
Modulation sending unit, carries out FDM modulation for the pmd layer at transmitting terminal to multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal.
14. sending and receiving systems according to claim 13, it is characterized in that, described encapsulation unit, it is adaptive specifically for the Service Data Unit of the customer data layer of transmitting terminal is carried out to GEM encapsulation in the adaptive sublayer of business of TC layer, obtain different GEM groupings, each GEM grouping is added to GEM packets headers; In the framing sublayer of TC layer,, be encapsulated in a multi-frame subframe payload arranged together the GEM grouping that need to transmit in same subchannel according to the address information of GEM packets headers, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload; Each multi-frame subframe is merged in a multi-frame.
15. sending and receiving systems according to claim 14, it is characterized in that, described encapsulation unit, also for by TC layer by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe with finish Frequency point and notify pmd layer by data-interface.
16. sending and receiving systems according to claim 13, it is characterized in that, described modulation sending unit, specifically in the pmd layer of transmitting terminal, the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length of the each multi-frame subframe sending by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
17. sending and receiving systems according to claim 12, is characterized in that, described receiving terminal comprises: receiving demodulation unit and decapsulation unit, wherein,
Receiving demodulation unit, receives the multi-frame after FDM modulation for the pmd layer at receiving terminal via optical fiber, and carries out FDM demodulation;
Decapsulation unit, the multi-frame decapsulation for the TC layer at receiving terminal after to demodulation obtains user data.
18. sending and receiving systems according to claim 17, it is characterized in that, described receiving demodulation unit, specifically in the pmd layer of receiving terminal, according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame.
19. sending and receiving systems according to claim 18, it is characterized in that, described decapsulation unit, specifically in the framing sublayer of the TC of receiving terminal layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
20. sending and receiving systems according to claim 18, is characterized in that, described reception configuration is sent to the receiving demodulation unit of receiving terminal by management channels by transmitting terminal.
Transmitting terminal in 21. 1 kinds of EPONs, is characterized in that, described transmitting terminal comprises: encapsulation unit and modulation sending unit, wherein,
Encapsulation unit, is packaged into multi-frame for the TC layer at transmitting terminal by user data;
Modulation sending unit, carries out FDM modulation for the pmd layer at transmitting terminal to multi-frame, and the multi-frame after modulating via optical fiber transmission FDM is to receiving terminal.
22. transmitting terminals according to claim 21, it is characterized in that, described encapsulation unit, adaptive specifically for the Service Data Unit of the customer data layer of transmitting terminal is carried out to GEM encapsulation in the adaptive sublayer of business of TC layer, obtain different GEM groupings, each GEM grouping is added to GEM packets headers; In the framing sublayer of TC layer,, be encapsulated in a multi-frame subframe payload arranged together the GEM grouping that need to transmit in same subchannel according to the address information of GEM packets headers, obtain multi-frame subframe at the additional multi-frame subframe frame head of multi-frame subframe payload; Each multi-frame subframe is merged in a multi-frame.
23. transmitting terminals according to claim 22, it is characterized in that, described encapsulation unit, also for by TC layer by the beginning Frequency point of the beginning byte of the length of each multi-frame subframe, subchannel assignment information, each multi-frame subframe and end byte and FDM modulation corresponding to each multi-frame subframe with finish Frequency point and notify pmd layer by data-interface.
24. transmitting terminals according to claim 21, it is characterized in that, described modulation sending unit, specifically in the pmd layer of transmitting terminal, the beginning Frequency point of FDM modulation corresponding to the beginning byte of the length of the each multi-frame subframe sending by data-interface according to TC layer, subchannel assignment information, each multi-frame subframe and end byte and each multi-frame subframe and finish Frequency point, each multi-frame subframe of multi-frame is carried out to FDM modulation, be modulated to corresponding subchannel.
Receiving terminal in 25. 1 kinds of EPONs, is characterized in that, described receiving terminal comprises: receiving demodulation unit and decapsulation unit, wherein,
Receiving demodulation unit, receives the multi-frame after FDM modulation for the pmd layer at receiving terminal via optical fiber, and carries out FDM demodulation;
Decapsulation unit, the multi-frame decapsulation for the TC layer at receiving terminal after to demodulation obtains user data.
26. receiving terminals according to claim 25, it is characterized in that, described receiving demodulation unit, specifically in the pmd layer of receiving terminal, according to receiving the beginning Frequency point of FDM modulation corresponding to the beginning byte of length, the subchannel assignment information of each multi-frame subframe of comprising in configuration, each multi-frame subframe and end byte and each multi-frame subframe and finishing Frequency point, at each subchannel, each multi-frame subframe of multi-frame is carried out to FDM demodulation, demodulate each multi-frame subframe of multi-frame.
27. receiving terminals according to claim 25, it is characterized in that, described decapsulation unit, specifically in the framing sublayer of the TC of receiving terminal layer, to the decapsulation of each multi-frame subframe, obtain each GEM grouping, in the adaptive sublayer of business of TC layer, the decapsulation that each GEM grouping is carried out to GEM obtains the Service Data Unit of customer data layer afterwards.
28. receiving terminals according to claim 26, is characterized in that, described reception configuration sends to described receiving demodulation unit by transmitting terminal by management channels.
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