CN101959091A - Data transmission method, system and operator fringe node - Google Patents

Data transmission method, system and operator fringe node Download PDF

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Publication number
CN101959091A
CN101959091A CN2009101670993A CN200910167099A CN101959091A CN 101959091 A CN101959091 A CN 101959091A CN 2009101670993 A CN2009101670993 A CN 2009101670993A CN 200910167099 A CN200910167099 A CN 200910167099A CN 101959091 A CN101959091 A CN 101959091A
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xpon
mac frame
pon
frame
physical layer
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CN101959091B (en
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郑若滨
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers

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Abstract

The embodiment of the invention discloses a data transmission method, a data transmission system and an operator fringe node. The method in the embodiment of the invention comprises the following steps of: performing passive optical network (PON) physical layer processing to acquire a PON media access control (MAC) frame; processing the PON MAC frame to acquire the next generation of xPON MAC frame, wherein the PON MAC frame is positioned in a load of the xPON MAC frame; and performing xPON physical layer processing on the xPON MAC frame to acquire an xPON physical layer signal and sending the xPON physical layer signal. The embodiment of the invention also provides a data transmission system and related equipment. The data transmission method, the data transmission system and the operator fringe node in the embodiment of the invention can effectively reduce the data transmission cost, prolong the optical transmission distance and reduce the realization complexity.

Description

A kind of data transmission method, system and Provider Edge node
Technical field
The present invention relates to communication field, relate in particular to a kind of data transmission method, system and Provider Edge node.
Background technology
EPON (PON, Passive Optical Network) technology is a kind of light access technology of point-to-multipoint mode, by optical network unit (ONU, Optical Network Unit), optical branching device, light path destination node (OLT, Optical Line Termination) and the optical fiber that connects this equipment are formed.OLT is as local side apparatus, be connected with optical branching device (Optical splitter) by a trunk optical fiber, optical branching device connects each ONU by independent branch optical fiber, down direction, optical branching device is realized the beam split function, by branch optical fiber the downlink optical signal of OLT is sent to all ONU; Up direction, optical branching device is realized the light signal aggregation feature, the light signal that all ONU are sent converges, and sends to OLT by trunk optical fiber.
Growth along with broadband services, EPON (PON, Passive Optical Network) technology is also in continuous evolution, from asynchronous transfer mode EPON (APON, Asynchronous TransferMode PON), broadband passive optical network (BPON, Broadband PON) is to Ethernet passive optical network (EPON, Ethernet PON), gigabit passive optical network (GPON, Gigabit PON), 10GEPON and 10G GPON, transmission bandwidth constantly increases.
The transmission range of PON is usually less than 20 kilometers, and in order effectively to promote the transmission range of PON, a kind of data transmission method of the prior art is:
Employing places Optical Transmission Network OTN (OTN with PON, Optical Transport Network) mode, it is the mode of PON over OTN, PON is carried on wavelength division multiplexing (WDM, Wavelength DivisionMultiplexing) on the network, extended the transmission range between optical network unit (ONU, Optical Network Unit) and the light path destination node (OLT, Optical Line Termination).
But that WDM adopts is the point-to-point (P2P of glory, Point to Point) technology, promptly be all to be coloured near the WDM equipment of ONU or near the WDM equipment of OLT, need on WDM equipment, provide an optical transceiver for each wavelength, and P2P optical fiber can not be shared, so the cost of such data transmission procedure is than higher;
Secondly, because PON (for example GPON/EPON) adopts time-multiplexed mode to carry out optical transmission usually, be that PON adopts burst mode to carry out optical transmission usually, existing OTN then adopts WDM equipment to carry out the optical transmission of continuous mode, therefore the data transfer mode of PON over OTN need be supported the conversion of burst mode to continuous mode, realizes complicated.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method, system and Provider Edge node, can effectively reduce the transfer of data cost, prolongs the optical transmission distance, and reduces implementation complexity.
A kind of data transmission method that the embodiment of the invention provides comprises: the passive optical network PON physical layer signal is handled obtaining PON media interviews control mac frame; Described PON mac frame handled obtaining next-generation passive optical network xPON media interviews control mac frame, described PON mac frame is arranged in the load of described xPON mac frame; Described xPON mac frame is carried out the xPON physical layer process obtain the xPON physical layer signal, and send described xPON physical layer signal.
The another kind of data transmission method that the embodiment of the invention provides comprises: the xPON physical layer signal is handled obtaining the xPON mac frame; Read the data in the load of described xPON mac frame; According to the frame head of described xPON mac frame the data in the load of described xPON mac frame are handled and to be obtained the PON mac frame; Described PON mac frame is carried out the PON physical layer process obtain the PON physical layer signal, and send described PON physical layer signal.
A kind of data transmission system that the embodiment of the invention provides comprises: customer edge nodes, be used to receive the data that subscriber terminal side sends, and described data are sent to the Provider Edge node; Described Provider Edge node, be used for the PON physical layer signal of described data handled and obtain the PON mac frame, described PON mac frame handled obtain the xPON mac frame, described PON mac frame is arranged in the load of described xPON mac frame, described xPON mac frame is carried out the xPON physical layer process obtain the xPON physical layer signal, and send described xPON physical layer signal.
The another kind of data transmission system that the embodiment of the invention provides, comprise: the Provider Edge node, being used for that the data that receive are reached the xPON physical layer signal handles and obtains the xPON mac frame, read the data in the load of described xPON mac frame, according to the frame head of described xPON mac frame the data in the load of described xPON mac frame are handled and to be obtained the PON mac frame, described PONMAC frame is carried out the PON physical layer process obtain the PON physical layer signal, and send described PON physical layer signal; Customer edge nodes is used to receive the PON physical layer signal that described Provider Edge node sends.
A kind of Provider Edge node that the embodiment of the invention provides comprises: a PON physical layer processing unit is used for the PON physical layer signal handled obtaining the PON mac frame; The first one-tenth frame processing unit is used for described PON mac frame handled obtaining the xPON mac frame, and described PON mac frame is arranged in the load of described xPON mac frame; The one xPON physical layer processing unit is used for that described xPON mac frame is carried out the xPON physical layer process and obtains the xPON physical layer signal, and sends described xPON physical layer signal.
The another kind of Provider Edge node that the embodiment of the invention provides comprises: the 2nd xPON physical layer processing unit is used for the xPON physical layer signal handled obtaining the xPON mac frame; The second one-tenth frame processing unit is used for reading the data of the load of described xPON mac frame, the data in the load of described xPON mac frame is handled obtaining the PON mac frame according to the frame head of described xPONMAC frame; The 2nd PON physical layer processing unit is used for that described PON mac frame is carried out the PON physical layer process and obtains the PON physical layer signal, and sends described PON physical layer signal.
The another kind of data transmission method that the embodiment of the invention provides comprises: the operation layer data are handled obtaining passive optical network PON media interviews control mac frame; Described PON mac frame handled obtaining next-generation passive optical network xPON media interviews control mac frame, described PON mac frame is arranged in the load of described xPON mac frame; Described xPON mac frame is carried out the xPON physical layer process obtain the xPON physical layer signal, and send described xPON physical layer signal.
The another kind of data transmission method that the embodiment of the invention provides comprises: the xPON physical layer signal that receives is handled obtaining the xPON mac frame; Read the data in the load of described xPON mac frame; According to the frame head of described xPON mac frame the data in the load of described xPON mac frame are handled and to be obtained the PON mac frame; Described PON mac frame handled obtain the operation layer data and send described operation layer data.
The another kind of Provider Edge node that the embodiment of the invention provides comprises: at least one PON MAC layer processing unit is used for the operation layer data are handled obtaining the PON mac frame; The one xPON MAC layer processing unit is used for described PON mac frame handled obtaining the xPON mac frame, and described PONMAC framing bit is in the load of described xPON mac frame; The xPON physical layer processing unit is used for that described xPON mac frame is carried out the xPON physical layer process and obtains the xPON physical layer signal, and sends described xPON physical layer signal.
The technical scheme of the embodiment of the invention can be with PON media interviews control (MAC, MediaAccess Control) frame is carried on the load of xPON mac frame, and by this xPON mac frame of xPON physical layer transmission, so can realize the data transfer mode of PON over xPON, and since near the xONU equipment replacement of ONU WDM equipment, xONU equipment is normally colourless, promptly need on xONU, not provide an optical transceiver for each wavelength, and if adopt P2MP (Point tomultipoint, point is to multiple spot) xPON can also realize the shared of optical fiber, therefore can effectively prolong the optical transmission distance, reduce the transfer of data cost; And by the characteristic of xPON as can be known, the data transfer mode of PON overxPON does not need to support the conversion of burst mode to continuous mode, so realize simple.
Description of drawings
Fig. 1 is a data transmission scheme configuration diagram in the embodiment of the invention;
Fig. 2 is embodiment schematic diagram of data transmission method in the embodiment of the invention;
Fig. 3 is another embodiment schematic diagram of data transmission method in the embodiment of the invention;
Fig. 4 is another embodiment schematic diagram of data transmission method in the embodiment of the invention;
Fig. 5 is another embodiment schematic diagram of data transmission method in the embodiment of the invention;
Fig. 6 (a) is a PON mac frame segmentation schematic diagram in the embodiment of the invention;
Fig. 6 (b) is a PON mac frame reorganization schematic diagram in the embodiment of the invention;
Fig. 7 (a)～Fig. 7 (c) is that frame head is handled schematic diagram in the embodiment of the invention;
Fig. 8 (a) is a PON mac frame segmentation schematic diagram in the embodiment of the invention;
Fig. 8 (b) is a PON mac frame reorganization schematic diagram in the embodiment of the invention;
Fig. 9 (a)～Fig. 9 (c) is that frame head is handled schematic diagram in the embodiment of the invention;
Figure 10 is the data transmission system embodiment schematic diagram in the embodiment of the invention;
Figure 11 is embodiment schematic diagram of Provider Edge node in the embodiment of the invention;
Figure 12 is another embodiment schematic diagram of Provider Edge node in the embodiment of the invention;
Figure 13 is another embodiment schematic diagram of data transmission method in the embodiment of the invention;
Figure 14 is another embodiment schematic diagram of data transmission method in the embodiment of the invention;
Figure 15 is another embodiment schematic diagram of Provider Edge node in the embodiment of the invention;
Figure 16 shows that xPON mac frame structural representation in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of data transmission method, system and Provider Edge, is used to reduce the transfer of data cost, and reduces implementation complexity.
The scheme of the embodiment of the invention proposes the data transmission method of a kind of PON over xPON, different PON lattice nestings, and for example GPON is nested with PON of future generation (NG-PON), and wherein ONU and OLT are GPON equipment, and xONU and xOLT are NG-PON equipment.
See also Fig. 1, be data transmission scheme configuration diagram in the embodiment of the invention.With the PON mac frame head (for example TC frame/GEM frame/EPON mac frame) of " PON n " expression next stage network, represent the PON mac frame head of upper level network with " PON n+1 " in the present embodiment.
The next stage network is expressed as PON in the present embodiment, the upper level network is expressed as xPON in the present embodiment, xPON can be NG-PON (as NG-GPON, NG-EPON) or WDM PON, and PON over xPON (PON is carried on xPON) realizes different PON lattice nestings.Wherein, xONU and xOLT can have for first hand operator, and OLT1 can be had by the second tame operator, and OLT2 can be had by the 3rd tame operator, realize that the xPON network can be shared by how tame operator.XOLT and OLT1-OLTn can be implemented in same physical equipment.
Wherein, customer edge nodes (CE-Node, Customer Edge Node) is made of the ONU/ONT/OLT of next stage network usually, is positioned at customer network edge;
Provider Edge node (PE-Node, Provider Edge Node) constitutes by xONU/xOLT equipment usually, be positioned at the carrier network edge, be used to add xPON connection identifier (PON n+1 added) or remove xPON connection identifier (PON n+1 removed), to converge (the PON-based Connection of the connection based on PON between CE-Node and the CE-Node, being designated hereinafter simply as PON connects), the tunnel based on xPON between PE-Node and PE-Node (xPON-based Tunnel) finally makes to constitute the complete connection based on PON between CE-Node and the CE-Node.
The transfer of data of PON over xPON in the embodiment of the invention be divided into the CE node to the uplink of PE node and PE node to the downlink transfer of CE node, be introduced respectively below:
One, the CE node is to the uplink of PE node:
See also Fig. 2, embodiment of data transmission method comprises in the embodiment of the invention:
201, the PON physical layer signal is handled obtained the PON mac frame;
In the present embodiment, the PON physical layer signal that the PE node sends the CE node is handled and can be got access to the PON mac frame.
PON mac frame in the present embodiment can be Transmission Convergence (TC in actual applications, Transmission Convergence) frame, or gigabit passive optical network encapsulation mode (GEM, GPONEncapsulation Method) frame, or EPON mac frame, or the PON mac frame of other types, specifically do not limit herein.
In the present embodiment, it is those skilled in the art's common practise that the PE node is handled the process that obtains the PON mac frame to the PON physical layer signal, does not limit herein.
202, the PON mac frame is handled obtained the xPON mac frame, the PON mac frame is arranged in the load of xPON mac frame;
In the present embodiment, after the PE node gets access to the PON mac frame, in order to realize the data transfer mode of PON overxPON, can handle this PON mac frame and obtain the xPON mac frame, specifically the PON mac frame can be carried in the load of xPON mac frame, concrete processing mode will be described in detail in subsequent embodiment.
203, this xPON mac frame is carried out the xPON physical layer process, and send the xPON physical layer signal.
After the PE node obtains the xPON mac frame, this xPON mac frame can be carried out the xPON physical layer process and obtain the xPON physical layer signal, and send the PE node of this xPON physical layer signal, thereby can realize that the xPON mac frame that carries the PON mac frame transmits in xPON to the other end.
In the present embodiment, the PE node can be carried on the PON mac frame load of xPON mac frame, can generate the xPON mac frame according to the PON mac frame, and by this xPONMAC frame of xPON physical layer transmission, so can realize the data transfer mode of PON over xPON, prolong the optical transmission distance, reduce the transfer of data cost; And the data transfer mode of PON over xPON does not need to support the conversion of burst mode to continuous mode in the present embodiment, can reduce implementation complexity.
For ease of understanding, with an instantiation uplink process of above-mentioned CE node to the PE node is described in detail below, in the present embodiment, the CE node is specially ONU, and the PE node is specially xONU.See also Fig. 3, another embodiment of the data transmission method in the embodiment of the invention comprises:
301, the PON physical layer signal is handled obtained the PON mac frame;
Step 301 in the present embodiment is identical with step 201 among the embodiment shown in Figure 2, repeats no more herein.
302, according to the relation between the length of PON mac frame and the length threshold that presets the PONMAC frame is carried out segmentation or reorganization;
In the present embodiment, after getting access to the PON mac frame, can determine its length.
Set in advance length threshold in the present embodiment, this length threshold comprises maximum length thresholding and minimum length threshold, and this length threshold can be relevant with the load of xPON mac frame size, perhaps can also with other parameter correlation, do not limit herein.
After the length of having determined the PON mac frame, this length and maximum length thresholding and minimum length threshold can be compared.
Concrete comparison procedure can for:
Obtain the length of PON mac frame;
Whether the length of judging the PON mac frame is less than the minimum length threshold that presets or greater than the maximum length thresholding that presets;
If the length of PON mac frame is then recombinated to a plurality of PON mac frames less than the minimum length threshold that presets, the length after a plurality of PON mac frame reorganization is less than or equal to the maximum length thresholding;
If the length of PON mac frame is then carried out segmentation with the PON mac frame greater than the maximum length thresholding that presets, the length of each segmentation of PON mac frame is more than or equal to minimum length threshold.
303, the data according to segmentation or reorganization generate the xPON mac frame;
After the PON mac frame being carried out segmentation or reorganization, can generate the xPON mac frame according to the data of segmentation or reorganization, concrete generative process can for:
If the PON mac frame is recombinated, PON mac frame after then will recombinating maps to the load of xPON mac frame fully, and mapping fully described herein is meant certain part in the load that copies to the xPON mac frame that the frame head of PON mac frame and payload is complete;
If the PON mac frame has been carried out segmentation, then can obtain a plurality of PON mac frames, each PONMAC frame comprises the frame head of PON mac frame and segmentation payload separately, afterwards each the PON mac frame after the segmentation is mapped to the load of different xPON mac frames respectively;
Finish after the mapping, add frame head for the load of xPON mac frame and generate the xPON mac frame.
Need to prove that if the PON mac frame is the TC frame, then its frame head is the TC frame head, if the PONMAC frame is the GEM frame, then its frame head is the GEM frame head, if the PON mac frame is the EPON mac frame, then its frame head is an EPON mac frame lead code;
If the xPON mac frame is the xGEM frame, then its frame head is the xGEM frame head, wherein comprise payload length indication (PLI, PDU Length Indicator), port-mark (Port ID), payload type indication (PTI, PDU Type Indicator), type of service (Type) and the wrong control of head (HEC, HeaderError Control), wherein, Port ID has represented the PON port-mark.Last segmentation when the least significant bit of PTI is used to refer to the GEM Frame and whether is segment processing for example, will be established with PTI and represent that for " 000 " this segmentation is not last segmentation, suppose with PTI to be that " 001 " represents that this is segmented into last segmentation.
In the present embodiment, utilizing certain territory (as the PTI territory) of the frame head of xGEM to indicate the PON mac frame is recombinated, is the reorganization of a plurality of PON mac frames as the load that shows xGEM when PTI is 111.
In the present embodiment, can also utilize certain territory (as the Type territory) of the frame head of xGEM to indicate the payload traffic type of xGEM frame, for example payload can be the TC/GEM frame of GPON or EPON be the EPON mac frame of sign with LLID, also can be the TC/xGEM frame of NG-GPON or NG-EPON be the NG-EPON mac frame of sign with LLID.
If the xPON mac frame is the NG-EPON mac frame, then its frame head is the ethernet mac frame head of band NG-EPON frame preamble sign indicating number.
In the present embodiment, can also pass through certain territory of the frame head of expansion NG-EPON mac frame, as EthernetType (ethernet type) territory or subtype (subtype) territory, indicate the payload traffic type of NG-EPON mac frame, for example payload can be the TC/GEM frame of GPON or EPON be the EPON mac frame of sign with LLID, also can be the TC/xGEM frame of NG-GPON or NG-EPON be the NG-EPON mac frame of sign with LLID.
In the present embodiment, can utilize NG-EPON mac frame lead code to indicate the PON mac frame is recombinated.
In the present embodiment, PON mac frame before the PE node processing can be called " C-PON (Customer PON) ", corresponding GPON packaged type port-mark (GPID, GEM Port ID)/LLID (LLID, Logical Link Identifier) is internal layer connection identifier (being the PON-basedConnection sign), be called " C-GEM (Customer GEM or Inner GEM) " for GPON, be called " C-LLID (Customer LLID or Inner LLID) " for EPON;
XPON mac frame after the PE node processing can be called " S-PON (Service PON) ", the xPON connection identifier that adds is outer connection identifier (being xPON-based Tunnel sign), be called " S-GEM (Service GEM or Outer GEM) " for NG-GPON, be called " S-LLID (Service LLID or Outer LLID) " for NG-EPON.
In the present embodiment, the GEM frame is the C-GEM frame, and the EPON mac frame is C-LLID place frame; The xGEM frame is the S-GEM frame, and the NG-EPON mac frame is S-LLID place frame.
In the present embodiment, for PON over xGEM, can add the xGEM frame head to the PON mac frame and obtain the xGEM frame, PON-based Connection is converged in xPON-based Tunnel, thereby realize TC/GEM/EPON mac frame over xGEM (TC/GEM frame/EPON mac frame is carried on the xGEM frame);
For PON over NG-EPON, can add the Ethernet frame head of band NG-EPON mac frame lead code to the PON mac frame, obtain the NG-EPON mac frame, PON-based Connection is converged in xPON-based Tunnel, thereby realize TC/GEM/EPON mac frame overNG-EPON mac frame.
304, carry out the xPON physical layer process, and send the xPON physical layer signal.
Step 304 in the present embodiment is identical with step 203 among the embodiment shown in Figure 2, repeats no more herein.
In the present embodiment, PE node xONU can recombinate the PON mac frame or segmentation, and generate the xPON mac frame according to the reorganization or the data of segmentation, and by this xPONMAC frame of xPON physical layer transmission, can realize the data transfer mode of PON over xPON, and since near the xONU equipment replacement of ONU the WDM equipment among the OTN, and xONU equipment is normally colourless, need on xONU, not provide an optical transceiver for each wavelength, therefore can effectively prolong the optical transmission distance, reduce the transfer of data cost; And the data transfer mode of PON over xPON does not need to support the conversion of burst mode to continuous mode in the present embodiment, can reduce implementation complexity.
Two, the PE node is to the downlink transfer of CE node:
See also Fig. 4, another embodiment of data transmission method comprises in the embodiment of the invention:
401, the xPON physical layer signal is handled obtained the xPON mac frame;
In the present embodiment, the PE node is handled the xPON physical layer signal that receives can get access to the xPON mac frame.
XPON mac frame in the present embodiment can specifically not limit for the xPON mac frame of xTC frame (the TC frame of NG GPON), xGEM frame, NG-EPON mac frame or other types in actual applications herein.
In the present embodiment, it is those skilled in the art's common practise that the PE node is handled the process that obtains the xPONMAC frame to the xPON physical layer signal that receives, and does not limit herein.
402, read data in the load of xPON mac frame;
After getting access to the xPON mac frame, in order to realize the downlink transfer from PE to CE, then need from this xPON mac frame, to obtain the PON mac frame, since at CE in the uplink of PE, the PON mac frame is arranged in the load of xPON mac frame, so can at first read the data in the load of xPON mac frame.
403, according to the frame head of xPON mac frame the data in the load of xPON mac frame are handled and obtained the PON mac frame;
In the present embodiment, after the data in the load that gets access to the xPON mac frame, can therefrom read out the PON mac frame according to the frame head of xPON mac frame, concrete mode will be described in detail in follow-up embodiment.
404, carry out the PON physical layer process, and send the PON physical layer signal.
After the PE node reads out the PON mac frame, can carry out the PON physical layer process to this PON mac frame and obtain the PON physical layer signal, and send this PON physical layer signal, thereby can realize that this PON mac frame transfers to PON from xPON to the CE node.
In the present embodiment, the PE node reads out the PON mac frame from the load of xPON mac frame, and by this PON mac frame of PON physical layer transmission, can realize the data transfer mode of PON over xPON, prolongs the optical transmission distance, reduces the transfer of data cost; And the data transfer mode of PON overxPON does not need to support the conversion of burst mode to continuous mode in the present embodiment, can reduce implementation complexity.
For ease of understanding, with an instantiation downlink transmission process of above-mentioned PE node to the CE node is described in detail below, see also Fig. 5, another embodiment of the data transmission method in the embodiment of the invention comprises:
501, the xPON physical layer signal is handled obtained the xPON mac frame;
PE node xONU obtains the xPON physical layer signal that sends from the PE node xOLT of the other end, this xPON physical layer signal is handled obtaining the xPON mac frame.
502～503, the frame head according to the xPON mac frame carries out segmentation or reorganization to the data in the load of xPON mac frame, and the frame head of deletion xPON mac frame obtains the PON mac frame;
After the data of PE node xONU in the load that gets access to the xPON mac frame, can carry out segmentation or reorganization to the data in the load of xPON mac frame according to the frame head of xPON mac frame, and obtain the PON mac frame by the frame head of deletion xPON mac frame, specifically following certain situation can be arranged:
A, to represent load when the frame head of xPON mac frame be the PON mac frame, and when comprising a plurality of complete PON mac frame in the load of an xPON mac frame, the frame head of deletion xPON mac frame, and according to the frame head of the PON mac frame in the load of xPON mac frame the data in the load of xPON mac frame are carried out segmentation and obtain a plurality of PON mac frames:
For example can utilize certain territory (as the Type territory) of the frame head of xGEM to indicate the payload traffic type of xGEM frame, perhaps pass through certain territory of the frame head of expansion NG-EPON mac frame, as EthernetType (ethernet type) territory or subtype (subtype) territory, indicate the payload traffic type of NG-EPON mac frame.
The xPON mac frame that for example receives is an xGEM frame, and the PTI in the frame head of this xGEM frame is 111, represent that then this xGEM frame is formed by a plurality of PON mac frame reorganization, then can directly delete the frame head of this xGEM frame, in the payload of this xGEM frame, divide and to determine a plurality of PON mac frames according to the frame head of PON mac frame.
B, to represent load when the frame head of xPON mac frame be the PON mac frame, and when comprising the partial data of a PON mac frame in the load of an xPON mac frame, determine a plurality of xPON mac frames according to the frame head of xPON mac frame, the frame head of a plurality of xPON mac frames that deletion is determined, make up the data of the load of these a plurality of xPON mac frames and obtain a PON mac frame:
The xPON mac frame that for example receives is the xGEM frame, and the PTI in the frame head of this xGEM frame is 000, then represent to comprise in the load of this xGEM frame the partial data of a PON mac frame, promptly form by the segmentation of a PON mac frame, then need to continue to receive the xGEM frame, the PTI in the frame head of the xGEM that receives is 001, then the frame head of these xGEM frames is deleted, and the data of taking out load make up, thereby can access a PON mac frame.
Need to prove that aforementioned xPON mac frame can be the xGEM frame, or the NG-EPON mac frame, aforementioned PON mac frame can be the TC frame, or the GEM frame, or the EPON mac frame.
In the present embodiment, for PON over xGEM, can remove the xGEM frame head to the xGEM frame after the xPON physical layer process, from xPON-based Tunnel, tell PON-basedConnection, thereby realize TC/GEM/EPON mac frame over xGEM (TC/GEM frame/EPONMAC frame is carried on the xGEM frame);
For PON over NG-EPON, can be to the deletion of the NG-EPON mac frame after NG-EPON physical layer process NG-EPON mac frame lead code, obtain TC/GEM frame/EPONMAC frame, from xPON-based Tunnel, divide and send PON-based Connection, thereby realize TC/GEM/EPON mac frame over NG-EPON mac frame.
504, carry out the PON physical layer process, and send the PON physical layer signal.
Step 504 in the present embodiment is identical with step 404 among the embodiment shown in Figure 4, repeats no more herein.
In the present embodiment, xONU receives the xPON physical layer signal from xOLT, and convert this xPON physical layer signal to the xPON mac frame, from the load of xPON mac frame, read out the PON mac frame, and by this PON mac frame of PON physical layer transmission, can realize the data transfer mode of PON over xPON, and since near the xONU equipment replacement of ONU the WDM equipment among the OTN, and xONU equipment is normally colourless, need on xONU, not provide an optical transceiver for each wavelength, therefore can effectively prolong the optical transmission distance, reduce the transfer of data cost; And the data transfer mode of PON overxPON does not need to support the conversion of burst mode to continuous mode, can reduce implementation complexity.
For ease of understanding, with two concrete examples above-mentioned up and downlink data transmission process is described below:
(1) the PON mac frame is the TC/GEM/EPON mac frame, and the xPON mac frame is the xGEM frame:
Up process:
A1, the PON physical layer signal handled obtain TC/GEM frame/EPON mac frame;
A2, GTC framing are handled;
Step a2 in the present embodiment can comprise mapping and two steps of framing:
A21, the TC/GEM/EPON mac frame is carried out segmentation or reorganization, each segmentation or reorganization are mapped to the load of an xGEM frame;
Specifically see also Fig. 6 (a) and Fig. 6 (b), wherein, shown in Fig. 6 (a)
Figure B2009101670993D0000121
Be the schematic diagram of segment processing, the TC/EPON mac frame is divided into a plurality of segmentations, and the TC/EPON mac frame data of each section are mapped to the loading section of an xGEM frame respectively, and the per minute section has all been duplicated TC frame head/EPON mac frame lead code;
The schematic diagram for the reorganization processing shown in Fig. 6 (b), a plurality of TC/EPON mac frame simple combination keep TC frame head/EPON mac frame lead code separately, are mapped to the loading section of an xGEM frame.
A22, each segmentation or reorganization are added the xGEM frame head and are constituted the xGEM frame;
After segmentation of TC/GEM/EPON mac frame or the reorganization, the TC/GEM/EPONMAC frame data of each segmentation or reorganization are mapped to the loading section of xGEM frame, add the xGEM frame head again, fill in the Type territory to show that load is the TC/GEM/EPON mac frame, fill in PTI to show segmentation or reorganization, promptly constitute an xGEM frame.
A3, send each xGEM frame by the xPON physical layer in order.
Descending process:
B1, the xPON physical layer signal handled obtain the xGEM frame;
B2, the loading section of xGEM frame is taken out;
B3, according to the Type territory and the PTI of xGEM frame, the data of a plurality of taking-ups of xGEM frame are recombinated, obtain the TC/GEM/EPON mac frame;
B4, the TC/GEM/EPON mac frame is carried out the PON physical layer process mail to CE.
In the present embodiment, all need the frame head of xGEM frame is handled at up and down direction, concrete processing procedure can be as Fig. 7 (a) to shown in Fig. 7 (c):
Wherein, Fig. 7 (a) is the transmitting uplink data mode (descending similar) of EPON MAC over xGEM, and wherein xONU does the processing of adding the xGEM frame head, and xOLT does the processing of removing the xGEM frame head.
Fig. 7 (b) is the transmitting uplink data mode of TC over xGEM, and wherein xONU does the processing of adding the xGEM frame head, and xOLT does the processing of removing the xGEM frame head.
Fig. 7 (c) is the downlink data transmission mode of TC over xGEM, and wherein xOLT does the processing of adding the xGEM frame head, and xONU does the processing of removing the xGEM frame head.
(2) the PON mac frame is the TC/GEM/EPON mac frame, and the xPON mac frame is the NG-EPONMAC frame:
Up process:
A1, the PON physical layer signal handled obtain TC/GEM frame/EPON mac frame;
A2, reconciliation sublayer (RS, Reconciliation Sublayer) are handled;
Step a2 in the present embodiment can comprise mapping and two steps of framing:
A21, TC/GEM frame/EPON mac frame is carried out segmentation or reorganization, each segmentation or reorganization are mapped to the load of a NG-EPON mac frame;
Specifically see also Fig. 8 (a) and Fig. 8 (b), wherein, shown in Fig. 8 (a) is the schematic diagram of segment processing, and the TC/GEM frame is divided into a plurality of segmentations, the TC/GEM frame data of each section are mapped to the loading section of a NG-EPON mac frame respectively, and the per minute section has all been duplicated the TC/GEM frame head;
The schematic diagram for the reorganization processing shown in Fig. 8 (b), a plurality of TC/GEM frame simple combination keep TC/GEM frame head separately, are mapped to the loading section of a NG-EPON mac frame.
The Ethernet frame head of band NG-EPON mac frame lead code is added in a22, each segmentation or reorganization, fills in the EthernetType territory to show that load is the TC/GEM/EPON mac frame, revises lead code to show segmentation or reorganization, constitutes the NG-EPON mac frame;
After segmentation of TC/GEM/EPON mac frame or the reorganization, the TC/GEM frame data of each segmentation or reorganization are mapped to the loading section of NG-EPON mac frame, add the Ethernet frame head of band NG-EPON mac frame lead code again, promptly constitute a NG-EPON mac frame.A kind of NG-EPON mac frame lead code comprises LLID delimiter initial (SLD, 8 bits), LLID (16 bit) and CRC (CRC, 8 bits).
A3, send each NG-EPON mac frame by the xPON physical layer in order.
Descending process:
B1, the xPON physical layer signal handled obtain the NG-EPON mac frame;
The Ethernet frame head of b2, removal band NG-EPON mac frame lead code obtains the TC/GEM/EPONMAC frame;
B3, according to NG-EPON mac frame lead code, the data of a plurality of taking-ups of NG-EPON mac frame lead code are recombinated, obtain the TC/GEM/EPON mac frame;
B4, the TC/GEM/EPON mac frame is carried out the PON physical layer process mail to CE.
In the present embodiment, all need the frame head of NG-EPON mac frame is handled at up and down direction, concrete processing procedure can be as Fig. 9 (a) to shown in Fig. 9 (c):
Wherein, Fig. 9 (a) is the transmitting uplink data mode (descending similar) of GEM over NG-EPON MAC, and wherein xONU does the processing of adding NG-EPON mac frame head, and xOLT does the processing of removing NG-EPON mac frame head.
Fig. 9 (b) is the transmitting uplink data mode of TC over NG-EPON MAC, and wherein xONU does the processing of adding NG-EPON mac frame head, and xOLT does the processing of removing NG-EPON mac frame head.
Fig. 9 (c) is the downlink data transmission mode of TC over NG-EPON MAC, and wherein xOLT does the processing of adding NG-EPON mac frame head, and xONU does the processing of removing NG-EPON mac frame head.
Below the data transmission system in the embodiment of the invention is described, sees also Figure 10, the data transmission system in the embodiment of the invention comprises:
Customer edge nodes 1001 is used to receive the data that subscriber terminal side sends, and these data are sent to Provider Edge node 1002 by the PON physical layer signal;
Provider Edge node 1002, be used for the PON physical layer signal that customer edge nodes 1001 sends is handled the PON mac frame that obtains customer edge nodes 1001 transmissions, the PON mac frame handled obtain the xPON mac frame, make the PON mac frame be arranged in the load of xPON mac frame, the xPON mac frame is carried out the xPON physical layer process obtain the xPON physical layer signal, and send the xPON physical layer signal.
Customer edge nodes 1001 can comprise ONU and OLT in the present embodiment, and Provider Edge node 1002 can comprise xOUN and xOLT.
The PONMAC frame in PON mac frame in the present embodiment and xPON mac frame and the previous embodiment and the implication of xPON mac frame are identical, repeat no more herein.
What describe in the present embodiment is the transmitting uplink data mode of customer edge nodes 1001 to Provider Edge node 1002,1001 downlink data transmission mode is described below from Provider Edge node 1002 to customer edge nodes, see also Figure 10 equally, another embodiment of communication system comprises in the embodiment of the invention:
Provider Edge node 1002, be used for the xPON physical layer signal that receives handled and obtain the xPON mac frame, read the data in the load of xPON mac frame, according to the frame head of xPON mac frame the data in the load of xPON mac frame are handled and to be obtained the PON mac frame, the PONMAC frame is carried out the PON physical layer process obtain the PON physical layer signal, send the PON physical layer signal;
Customer edge nodes 1001 is used to receive the PON physical layer signal that Provider Edge node 1002 sends.
Customer edge nodes 1001 can comprise ONU and OLT in the present embodiment, and Provider Edge node 1002 can comprise xOUN and xOLT.
The PONMAC frame in PON mac frame in the present embodiment and xPON mac frame and the previous embodiment and the implication of xPON mac frame are identical, repeat no more herein.
In the present embodiment, Provider Edge node 1002 can be changed PON mac frame and xPON mac frame mutually, and can pass through xPON physical layer transmission xPON mac frame, by PON physical layer transmission PON mac frame, so can realize the data transfer mode of PON over xPON, prolong the optical transmission distance, effectively reduce the transfer of data cost; And the data transfer mode of PON over xPON does not need to support the conversion of burst mode to continuous mode in the present embodiment, can reduce implementation complexity.
Introduce the Provider Edge node embodiment in the embodiment of the invention below, see also Figure 11, embodiment of the Provider Edge node in the embodiment of the invention comprises:
The one PON physical layer processing unit 1101 is used for PON (for example GPON or EPON) physical layer signal handled obtaining the PON mac frame;
The first one-tenth frame processing unit 1103 is used for the PON mac frame handled obtaining the xPON mac frame, and the PON mac frame is arranged in the load of xPON mac frame;
For example for PON over xGEM, can add the xGEM frame head to the PON mac frame and obtain the xGEM frame, PON-based Connection is converged in xPON-based Tunnel, thereby realize TC/GEM/EPON mac frame over xGEM (TC/GEM frame/EPON mac frame is carried on the xGEM frame);
For example for PON over NG-EPON, can add the Ethernet frame head of band NG-EPONMAC frame preamble sign indicating number to the PON mac frame, obtain the NG-EPON mac frame, PON-basedConnection is converged in xPON-based Tunnel, thereby realize TC/GEM/EPON mac frame over NG-EPON mac frame.
The one xPON physical layer processing unit 1104 is used for the xPON mac frame is carried out xPON (for example 10G-GPON or 10G-EPON) physical layer process, obtains the xPON physical layer signal and sends this xPON physical layer signal.
Provider Edge node in the present embodiment can further include:
Multiplexing Unit 1102, relation between the length threshold that is used for the length of the PONMAC frame that obtains according to a PON physical layer processing unit 1101 and presets is carried out segmentation or reorganization to the PON mac frame, the PON mac frame after segmentation or the reorganization is sent to the first one-tenth frame processing unit 1103 handles.
What describe in the present embodiment is the transmitting uplink data mode of CE node to the PE node, for ease of understanding, describes with a concrete application scenarios below:
In the present embodiment, 1101 pairs of PON physical layer signals of a PON physical layer processing unit are handled and can be got access to the PON mac frame.
After getting access to the PON mac frame, Multiplexing Unit 1102 can be determined its length, and this length and the maximum length thresholding and the minimum length threshold that preset are compared, and according to comparative result the PON mac frame is carried out segmentation or reorganization.
This maximum length thresholding and minimum length threshold are default value, and be concrete relevant with practical application, do not limit herein.
The comparison procedure of describing among concrete comparison procedure and the aforementioned method embodiment shown in Figure 3 is consistent, repeats no more herein.
Multiplexing Unit 1102 is after carrying out segmentation or reorganization to the PON mac frame, the first one-tenth frame processing unit 1103 can generate the xPON mac frame according to the data of segmentation or reorganization, the generative process of describing among concrete generative process and the aforementioned method embodiment shown in Figure 2 is consistent, repeats no more herein.
After the first one-tenth frame processing unit 1103 obtains the xPON mac frame, the one xPON physical layer processing unit 1104 can be carried out the xPON physical layer process to this xPON mac frame and be obtained the xPON physical layer signal, and send this xPON physical layer signal, thereby can realize that the xPON mac frame that carries the PON mac frame transmits in xPON.
In the present embodiment, Multiplexing Unit 1102 can be recombinated the PON mac frame or segmentation, the first one-tenth frame processing unit 1103 generates the xPON mac frame according to the data of reorganization or segmentation, and an xPON physical layer processing unit 1104 is by this xPON mac frame of xPON physical layer transmission, so can realize the data transfer mode of PON over xPON, effectively reduce the transfer of data cost; And the data transfer mode of PON over xPON does not need to support the conversion of burst mode to continuous mode in the present embodiment, can reduce implementation complexity.
See also Figure 12, another embodiment of Provider Edge node in the embodiment of the invention comprises:
The 2nd xPON physical layer processing unit 1201 is used for xPON (for example 10G-GPON or 10G-EPON) physical layer signal handled obtaining the xPON mac frame;
The second one-tenth frame processing unit 1203 is used for reading the data of the load of xPON mac frame, the data in the load of xPON mac frame is handled obtaining the PONMAC frame according to the frame head of xPON mac frame;
For example for PON over xGEM, can remove the xGEM frame head to the xGEM frame after the xPON physical layer process, from xPON-based Tunnel, tell PON-based Connection, thereby realize TC/GEM/EPON mac frame over xGEM (TC/GEM frame/EPON mac frame is carried on the xGEM frame);
For example for PON over NG-EPON, can be to the deletion of the NG-EPON mac frame after NG-EPON physical layer process NG-EPON mac frame lead code, obtain TC/GEM frame/EPONMAC frame, from xPON-based Tunnel, divide and send PON-based Connection, thereby realize TC/GEM/EPON mac frame over NG-EPON mac frame.
The 2nd PON physical layer processing unit 1204 is used for the PON mac frame is carried out PON (for example GPON or EPON) physical layer process, obtains the PON physical layer signal and sends this PON physical layer signal;
For GPON, finish the GPM sublayer function of GPON, when PON data link layer frame is GTC TC frame, need produce the lead code (preamble) of GTC TC frame again; For EPON, finish the PHY layer function of EPON, comprise PDM, PMA, PCS, when PON data link layer frame is the EPON mac frame, need produce the lead code (preamble) of EPON mac frame again.
Provider Edge node in the present embodiment can further include:
Demultiplexing unit 1202, the data that are used for the load of xPONMAC frame that the 2nd xPON physical layer processing unit 1201 is obtained are carried out segmentation or reorganization, the data after segmentation or the reorganization are sent to the second one-tenth frame processing unit 1203 handle.
What describe in the present embodiment is the transmitting uplink data mode of PE node to the CE node, for ease of understanding, describes with a concrete application scenarios below:
In the present embodiment, 1201 pairs of xPON physical layer signals of the 2nd xPON physical layer processing unit are handled and can be got access to the xPON mac frame.
XPON mac frame in the present embodiment can be the xGEM frame in actual applications, or the NG-EPON mac frame, or the xPON mac frame of other types, does not specifically limit herein.
In the present embodiment, it is those skilled in the art's common practise that 1201 pairs of xPON physical layer signals of the 2nd xPON physical layer processing unit are handled the process that obtains the xPON mac frame, does not limit herein.
After the 2nd xPON physical layer processing unit 1201 gets access to data in the load of xPON mac frame, demultiplexing unit 1202 can carry out segmentation or reorganization to the data in the load of xPON mac frame according to the frame head of xPON mac frame, the second one-tenth frame processing unit 1203 obtains the PON mac frame by the frame head of deleting the xPON mac frame, detailed process is consistent with the aforementioned middle process of describing embodiment illustrated in fig. 5, repeats no more herein.
After the second one-tenth frame processing unit 1203 reads out the PON mac frame, the 2nd PON physical layer processing unit 1204 can be carried out the PON physical layer process and be obtained the PON physical layer signal, and send this PON physical layer signal, thereby can realize that this PON mac frame transfers to PON from xPON.
In the present embodiment, demultiplexing unit 1202 can be recombinated the PON mac frame or segmentation, the second one-tenth frame processing unit 1203 generates the xPON mac frame according to the data of reorganization or segmentation, the 2nd PON physical layer processing unit 1204 is by this xPON mac frame of xPON physical layer transmission, so can realize the data transfer mode of PON over xPON, reduce the transfer of data cost; And in the present embodiment, the data transfer mode of PON over xPON does not need to support the conversion of burst mode to continuous mode, can reduce implementation complexity.
A kind of data transmission method is provided in the embodiment of the invention in addition, as shown in figure 13, has comprised:
1301, the operation layer data are handled obtained the PON mac frame;
In the present embodiment, these operation layer data can be IP packet, ethernet frame or time multiplexing date bag.PON mac frame in the present embodiment can be Transmission Convergence (TC in actual applications, Transmission Convergence) frame, or gigabit passive optical network encapsulation mode (GEM, GPONEncapsulation Method) frame, or EPON mac frame, or the PON mac frame of other types, specifically do not limit herein.
In the present embodiment, encapsulation obtains the common practise of the process of PON mac frame for those skilled in the art to PE node xOLT to data, does not limit herein.
1302, the PON mac frame is handled obtained the xPON mac frame, make the PON mac frame be arranged in the load of xPON mac frame;
In the present embodiment, when the PE node to the data processing that receives and after obtaining the PON mac frame, in order to realize the data transfer mode of PON over xPON, can handle this PON mac frame and obtain the xPON mac frame, specifically the PON mac frame can be carried in the load of xPON mac frame, for example, can add the xGEM frame head to the PON mac frame and obtain the xGEM frame, to converge into tunnel based on the connection of PON, thereby realize TC/GEM/EPON mac frame over xGEM (the TC/GEM/EPON mac frame is carried in the xGEM frame) based on xPON; Again for example, can add the Ethernet frame head of band NG-EPON mac frame lead code, obtain the NG-EPON mac frame, thereby realize that the TC/GEM/EPON mac frame is carried in the NG-EPON mac frame the PON mac frame.The PONMAC frame is being handled in the process that obtains the xPON mac frame, also can carried out segmentation or reorganization to the PON mac frame according to the content in the previous embodiment.
Is transparent in order to make the xPON mac frame to the carrying of PON MAC, promptly the propagation delay time of all data on xPON is identical, a kind of method of the xPON of encapsulation mac frame is provided in the embodiment of the invention, make xPON mac frame structure divide fixing transmission block of bytes (data partition among the figure) for each PON, and guarantee that the order of these block of bytes is constant according to the PON bandwidth.As shown in figure 16, for being 4 times of bandwidth of PON when the bandwidth of xPON, when the PON mac frame is the TC frame, then comprise 4 fixing PON TC frame data subregions in the xPON TC frame after the encapsulation.
1303, this xPON mac frame is carried out the xPON physical layer process, and send the xPON physical layer signal.
After PE node xOLT obtains the xPON mac frame, this xPON mac frame can be carried out the xPON physical layer process and obtain the xPON physical layer signal, and send the PE node xONU of this xPON physical layer signal, thereby can realize that the xPON mac frame that carries the PON mac frame transmits in xPON to the other end.
The above embodiment of the present invention can either realize that optical network device and other send the intercommunication of the equipment of operation layer data, the PON mac frame can be carried on the load of xPON mac frame again, and by this xPON mac frame of xPON physical layer transmission, so can realize the data transfer mode of PON over xPON, prolong the optical transmission distance, reduce the transfer of data cost; And in the present embodiment, the data transfer mode of PON over xPON does not need to support the conversion of burst mode to continuous mode, has reduced implementation complexity.
Another data transmission method is provided in the embodiment of the invention, has comprised:
1401, receive the xPON physical layer signal, this xPON physical layer signal is handled obtaining the xPONMAC frame;
In the present embodiment, PE node xOLT handles the xPON physical layer signal that receives can get access to the xPON mac frame.
XPON mac frame in the present embodiment can specifically not limit for the xPON mac frame of xTC frame (the TC frame of NG GPON), xGEM frame, NG-EPON mac frame or other types in actual applications herein.
In the present embodiment, it is those skilled in the art's common practise that PE node xOLT handles the process that obtains the xPON mac frame to the xPON physical layer signal that receives, and does not limit herein.
1402, read data in the load of xPON mac frame;
After getting access to the xPON mac frame, for data are transferred to other non-optical network devices by PON, need from this xPON mac frame, obtain the PON mac frame, because in the transmission of PON over xPON, the PON mac frame is arranged in the load of xPON mac frame, so can at first read the data in the load of xPON mac frame.
1403, according to the frame head of xPON mac frame the data in the load of xPON mac frame are handled and obtained the PON mac frame;
In the present embodiment, after the data in the load that gets access to the xPON mac frame, xOLT can therefrom read out the PON mac frame according to the frame head of xPON mac frame, and concrete mode is referring to the foregoing description.If be at xONU the PON mac frame has been carried out segmentation or reorganization, then xOLT also needs the data in the load of xPON mac frame are recombinated or segmentation accordingly, just can obtain correct PON mac frame.
1404, the PON mac frame that obtains is handled, obtained operation layer data and transmission.
When PE node xOLT after the xPON mac frame obtains the PON mac frame, this PON mac frame is handled, the operation layer data that the network equipment that obtains being connected with this PE node can transmit also send.For example,, then need the PON mac frame handled obtaining ethernet frame, then this ethernet frame is sent to the Ethernet that is connected with xOLT if xOLT is connected to Ethernet.
In the present embodiment, xOLT can read out the PON mac frame from the load of xPON mac frame, then this PON mac frame is generated operation layer data and transmission, can realize the data transfer mode of PON over xPON, prolong the optical transmission distance, reduce the transfer of data cost; And in the present embodiment, the data transfer mode of PONover xPON does not need to support the conversion of burst mode to continuous mode, has reduced implementation complexity.
The embodiment of the invention also provides a kind of Provider Edge node, is used to realize above-mentioned Figure 13 and/or method shown in Figure 14, and this Provider Edge node comprises as shown in figure 15:
At least one PON MAC layer processing unit 1501 is used for the operation layer data are handled obtaining the PON mac frame, and wherein, these operation layer data can be IP bag or ethernet frame.
The one xPON MAC layer processing unit 1503 is used for the PON mac frame that PON MAC layer processing unit 1501 obtains handled obtaining the xPON mac frame, and the PON mac frame is arranged in the load of xPONMAC frame, and concrete processing method can be with reference to the foregoing description.
When described Provider Edge node comprises two or more PON MAC layer processing unit, is transparent in order to make the xPON mac frame to the carrying of PON MAC, promptly the propagation delay time of all data on xPON is identical, a kind of method of the xPON of encapsulation mac frame is provided in the embodiment of the invention, make xPON mac frame structure divide fixing transmission block of bytes (data partition among the figure) for each PON, and guarantee that the order of these block of bytes is constant according to the PON bandwidth.As shown in figure 16, for being 4 times of bandwidth of PON when the bandwidth of xPON, when the PON mac frame is the TC frame, then comprise 4 fixing PON TC frame data subregions in the xPON TC frame after the encapsulation.
XPON physical layer processing unit 1504 is used for the xPON mac frame is handled, and obtains the xPON physical layer signal, and sends described xPON physical layer signal.
Provider Edge node in the present embodiment can further include:
Multiplex/demultiplex unit 1502, relation between the length threshold that is used for the length of the PONMAC frame that obtains according to PON MAC layer processing unit 1501 and presets is carried out segmentation or reorganization to the PON mac frame, the PON mac frame after segmentation or the reorganization is sent to an xPON MAC layer processing unit 1503 handles.
XPON physical layer processing unit 1504 in the Provider Edge node in the embodiment of the invention, the xPON physical layer signal that can also be used for receiving converts the xPON mac frame to.
Provider Edge node in the present embodiment can further include: the 2nd xPON mac frame processing unit 1505, be used for reading the data of the load of the xPON mac frame that x PON physical layer processing unit 1504 obtains, frame head according to the xPON mac frame obtains the PON mac frame to the data processing in the load of xPON mac frame, and concrete processing method can be with reference to the foregoing description; When comprising multiplex/demultiplex unit 1502 in the Provider Edge node, described multiplex/demultiplex unit 1502 also is used for the data of the load of xPON mac frame that the 2nd xPON mac frame processing unit 1505 is obtained and carries out segmentation or reorganization, the data after segmentation or the reorganization is sent to PON mac frame processing unit 1501 handles.Described PON mac frame processing unit also is used for the PONMAC frame that receives is handled, and obtains the operation layer data.
XPON MAC layer processing unit 1503 in the above embodiment of the present invention and the 2nd xPONMAC layer processing unit 1505 can divide and be arranged, also can be arranged in the same module, Multiplexing Unit and demultiplexing unit also can separately be arranged in multiplex/demultiplex unit 1502 wherein.
In the present embodiment, the Provider Edge node can read out the PONMAC frame from the load of xPON mac frame, then this PON mac frame is generated operation layer data and transmission, can realize the data transfer mode of PON overxPON, prolong the optical transmission distance, reduce the transfer of data cost; And in the present embodiment, the data transfer mode of PON over xPON does not need to support the conversion of burst mode to continuous mode, has reduced implementation complexity.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than a kind of data transmission method provided by the present invention, system and relevant device are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (18)

1. a data transmission method is characterized in that, comprising:
The passive optical network PON physical layer signal handled obtain PON media interviews control mac frame;
Described PON mac frame handled obtaining next-generation passive optical network xPON media interviews control mac frame, described PON mac frame is arranged in the load of described xPON mac frame;
Described xPON mac frame is carried out the xPON physical layer process obtain the xPON physical layer signal, and send described xPON physical layer signal.
2. method according to claim 1 is characterized in that, the described PON mac frame is handled obtains next-generation passive optical network xPON media interviews control mac frame and comprise:
According to the relation between the length of described PON mac frame and the length threshold that presets described PON mac frame is carried out segmentation or reorganization;
Data according to segmentation or reorganization generate the xPON mac frame, and the data of described each segmentation or reorganization are positioned at the load of described xPON mac frame.
3. method according to claim 2 is characterized in that, described according to described PON mac frame length and described PON mac frame is carried out segmentation to the relation between the length threshold that presets or reorganization comprises:
Obtain the length of described PON mac frame;
Whether the length of judging described PON mac frame is less than the minimum length threshold that presets or greater than the maximum length thresholding that presets;
If the length of described PON mac frame is then recombinated to a plurality of PONMAC frames less than the minimum length threshold that presets, the length after described a plurality of PON mac frame reorganization is less than or equal to the maximum length thresholding;
If the length of described PON mac frame is then carried out segmentation with described PONMAC frame greater than the maximum length thresholding that presets, the length of each segmentation of described PON mac frame is more than or equal to minimum length threshold.
4. method according to claim 2 is characterized in that, described data according to segmentation or reorganization generate the xPON mac frame and comprise:
PON mac frame after the reorganization is mapped to the load of xPON mac frame fully, or each segmentation of described PON mac frame is mapped to the load of different xPON mac frames;
Add frame head for the load of described xPON mac frame and generate the xPON mac frame.
5. method according to claim 4 is characterized in that,
Comprise payload type indication PTI or lead code in the described frame head, described payload type indication PTI or lead code are used for indicating the load of described xPON mac frame to include the PON mac frame;
Or,
Comprise type of service parameter field or newly-increased parameter field in the described frame head, described type of service parameter field or newly-increased parameter field are used for indicating the load of described xPON mac frame to include the PON mac frame.
6. a data transmission method is characterized in that, comprising:
The xPON physical layer signal handled obtain the xPON mac frame;
Read the data in the load of described xPON mac frame;
According to the frame head of described xPON mac frame the data in the load of described xPON mac frame are handled and to be obtained the PON mac frame;
Described PON mac frame is carried out the PON physical layer process obtain the PON physical layer signal, and send described PON physical layer signal.
7. method according to claim 6 is characterized in that, described frame head according to described xPON mac frame is handled the data in the load of described xPON mac frame and obtained the PON mac frame and comprise:
When in the frame head of described xPON mac frame is represented the load of an xPON mac frame, comprising a plurality of complete PON mac frame, delete the frame head of described xPON mac frame;
According to the frame head of the PON mac frame in the load of described xPON mac frame the data in the load of described xPONMAC frame are carried out segmentation and obtain a plurality of PON mac frames;
Or,
When in the frame head of described xPON mac frame is represented the load of an xPON mac frame, comprising the partial data of a PON mac frame, determine a plurality of xPONMAC frames according to the frame head of described xPON mac frame;
Delete the frame head of described definite a plurality of xPON mac frames, the data of the load of described a plurality of xPON mac frames are made up obtain a PON mac frame.
8. a data transmission system is characterized in that, comprising:
Customer edge nodes is used to receive the data that subscriber terminal side sends, and described data are sent to the Provider Edge node;
Described Provider Edge node, be used for the PON physical layer signal of described data handled and obtain the PON mac frame, described PON mac frame handled obtain the xPON mac frame, described PONMAC framing bit is in the load of described xPON mac frame, described xPON mac frame is carried out the xPON physical layer process obtain the xPON physical layer signal, and send described xPON physical layer signal.
9. a data transmission system is characterized in that, comprising:
The Provider Edge node, being used for that the data that receive are reached the xPON physical layer signal handles and obtains the xPON mac frame, read the data in the load of described xPON mac frame, according to the frame head of described xPON mac frame the data in the load of described xPON mac frame are handled and to be obtained the PON mac frame, described PON mac frame is carried out the PON physical layer process obtain the PON physical layer signal, and send described PON physical layer signal;
Customer edge nodes is used to receive the PON physical layer signal that described Provider Edge node sends.
10. a Provider Edge node is characterized in that, comprising:
The one PON physical layer processing unit is used for the PON physical layer signal handled obtaining the PONMAC frame;
The first one-tenth frame processing unit is used for described PON mac frame handled obtaining the xPON mac frame, and described PON mac frame is arranged in the load of described xPON mac frame;
The one xPON physical layer processing unit is used for that described xPON mac frame is carried out the xPON physical layer process and obtains the xPON physical layer signal, and sends described xPON physical layer signal.
11. Provider Edge node according to claim 10 is characterized in that, described Provider Edge node also comprises:
Multiplexing Unit, relation between the length threshold that is used for the length of the PON mac frame that obtains according to a described PON physical layer processing unit and presets is carried out segmentation or reorganization to described PON mac frame, the PON mac frame after segmentation or the reorganization is sent to the first one-tenth frame processing unit handles.
12. a Provider Edge node is characterized in that, comprising:
The 2nd xPON physical layer processing unit is used for the xPON physical layer signal handled obtaining the xPON mac frame;
The second one-tenth frame processing unit is used for reading the data of the load of described xPON mac frame, the data in the load of described xPON mac frame is handled obtaining the PON mac frame according to the frame head of described xPON mac frame;
The 2nd PON physical layer processing unit is used for that described PON mac frame is carried out the PON physical layer process and obtains the PON physical layer signal, and sends described PON physical layer signal.
13. Provider Edge node according to claim 12 is characterized in that, described Provider Edge node also comprises:
Demultiplexing unit, the data that are used for the load of xPON mac frame that described the 2nd xPON physical layer processing unit is obtained are carried out segmentation or reorganization, the data after segmentation or the reorganization are sent to described the second one-tenth frame processing unit handle.
14. a data transmission method is characterized in that, comprising:
The operation layer data are handled obtain passive optical network PON media interviews control mac frame;
Described PON mac frame handled obtaining next-generation passive optical network xPON media interviews control mac frame, described PON mac frame is arranged in the load of described xPON mac frame;
Described xPON mac frame is carried out the xPON physical layer process obtain the xPON physical layer signal, and send described xPON physical layer signal.
15. a data transmission method is characterized in that, comprising:
The xPON physical layer signal that receives handled obtain the xPON mac frame;
Read the data in the load of described xPON mac frame;
According to the frame head of described xPON mac frame the data in the load of described xPON mac frame are handled and to be obtained the PON mac frame;
Described PON mac frame handled obtain the operation layer data and send described operation layer data.
16. a Provider Edge node is characterized in that, comprising:
At least one PON MAC layer processing unit is used for the operation layer data are handled obtaining the PONMAC frame;
The one xPON MAC layer processing unit is used for described PON mac frame handled obtaining the xPON mac frame, and described PON mac frame is arranged in the load of described xPON mac frame;
The xPON physical layer processing unit is used for that described xPON mac frame is carried out the xPON physical layer process and obtains the xPON physical layer signal, and sends described xPON physical layer signal.
17. Provider Edge node according to claim 16, it is characterized in that, described Provider Edge node also comprises the 2nd xPON MAC layer processing unit, and described xPON physical layer processing unit also is used for the xPON physical layer signal that receives handled and obtains the xPON mac frame;
Described the 2nd xPON MAC layer processing unit is used for reading the data of the load of described xPON mac frame, the data in the load of described xPON mac frame handled obtaining the PON mac frame according to the frame head of described xPON mac frame.
18. Provider Edge node according to claim 17, it is characterized in that, described PON MAC layer processing unit also is used for the PON mac frame that described the 2nd xPON MAC layer processing unit obtains is handled, and obtains the operation layer data and sends described operation layer data.
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