CN101959091B - Data transmission method, system and operator fringe node - Google Patents

Abstract

The embodiment of the present invention discloses a data transmission method, system, and operator edge node. The method described in the embodiment of the present invention includes: performing passive optical network PON physical layer processing to obtain a PON media access control MAC frame; The frame is processed to obtain a next-generation passive optical network xPON media access control MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame; xPON physical layer processing is performed on the xPON MAC frame to obtain an xPON physical layer signal, and the transmission The xPON physical layer signal. The embodiment of the present invention also provides a data transmission system and related equipment. The embodiment of the present invention can effectively reduce data transmission cost, prolong optical transmission distance, and reduce implementation complexity.

Description

A data transmission method, system and carrier edge node

technical field

The present invention relates to the communication field, in particular to a data transmission method, system and operator edge node.

Background technique

Passive Optical Network (PON, Passive Optical Network) technology is a point-to-multipoint optical access technology, which consists of an optical network unit (ONU, Optical Network Unit), an optical splitter, and an optical path termination point (OLT, Optical Line Termination) and the optical fiber connecting this device. As the central office equipment, the OLT is connected to the optical splitter (Optical splitter) through a trunk fiber, and the optical splitter connects each ONU through a separate branch fiber. Send the downlink optical signal of the OLT to all ONUs; in the uplink direction, the optical splitter realizes the optical signal aggregation function, aggregates the optical signals sent by all ONUs, and sends them to the OLT through the backbone optical fiber.

With the growth of broadband services, passive optical network (PON, Passive Optical Network) technology is also evolving, from asynchronous transfer mode passive optical network (APON, Asynchronous TransferMode PON), broadband passive optical network (BPON, Broadband PON) ) to Ethernet passive optical network (EPON, Ethernet PON), gigabit passive optical network (GPON, Gigabit PON), 10GEPON and 10G GPON, the transmission bandwidth is increasing continuously.

The transmission distance of PON is usually less than 20 kilometers. In order to effectively improve the transmission distance of PON, a data transmission method in the prior art is:

The PON is placed on the Optical Transport Network (OTN, Optical Transport Network), that is, the PON over OTN method, and the PON is carried on the wavelength division multiplexing (WDM, Wavelength Division Multiplexing) network, extending the optical network unit (ONU, Optical Network Unit) and the transmission distance between the Optical Line Termination (OLT, Optical Line Termination).

However, WDM adopts the point-to-point (P2P, Point to Point) technology of colored light, that is, both the WDM equipment near the ONU and the WDM equipment near the OLT are colored, and it is necessary to provide an optical transceiver for each wavelength on the WDM equipment. device, and P2P fiber cannot be shared, so the cost of such data transmission process is relatively high;

Secondly, because PON (such as GPON/EPON) usually uses time division multiplexing for optical transmission, that is, PON usually uses burst mode for optical transmission, while the existing OTN uses WDM equipment for continuous mode optical transmission, so PON The data transmission method of over OTN needs to support the conversion from burst mode to continuous mode, which is complicated to implement.

Contents of the invention

Embodiments of the present invention provide a data transmission method, system, and operator edge node, which can effectively reduce data transmission costs, extend optical transmission distance, and reduce implementation complexity.

A data transmission method provided by an embodiment of the present invention includes: processing a PON physical layer signal of a passive optical network to obtain a PON media access control MAC frame; processing the PON MAC frame to obtain a next-generation passive optical network xPON medium access control MAC frame, the PON MAC frame is located in the load of the xPON MAC frame; xPON physical layer processing is performed on the xPON MAC frame to obtain an xPON physical layer signal, and the xPON physical layer signal is sent.

Another data transmission method provided by the embodiment of the present invention includes: processing the xPON physical layer signal to obtain an xPON MAC frame; reading the data in the load of the xPON MAC frame; The data in the load of the xPON MAC frame is processed to obtain a PON MAC frame; the PON physical layer processing is performed on the PON MAC frame to obtain a PON physical layer signal, and the PON physical layer signal is sent.

A data transmission system provided by an embodiment of the present invention includes: a user edge node, configured to receive data sent by a user terminal side, and send the data to an operator edge node; The PON physical layer signal in the data is processed to obtain a PON MAC frame, and the PON MAC frame is processed to obtain an xPON MAC frame, the PON MAC frame is located in the load of the xPON MAC frame, and the xPON MAC frame is processed The xPON physical layer is processed to obtain the xPON physical layer signal, and the xPON physical layer signal is sent.

Another data transmission system provided by an embodiment of the present invention includes: an operator edge node, configured to process xPON physical layer signals in received data to obtain xPON MAC frames, and read the load of the xPON MAC frames According to the frame header of the xPON MAC frame, the data in the load of the xPON MAC frame is processed to obtain a PON MAC frame, and the PON physical layer processing is performed on the PON MAC frame to obtain a PON physical layer signal, and the described PON physical layer signal; the user edge node is configured to receive the PON physical layer signal sent by the operator edge node.

An operator edge node provided by an embodiment of the present invention includes: a first PON physical layer processing unit, configured to process a PON physical layer signal to obtain a PON MAC frame; a first framing processing unit, configured to process the PON MAC frame The MAC frame is processed to obtain an xPON MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame; the first xPON physical layer processing unit is used to perform xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal , and send the xPON physical layer signal.

Another carrier edge node provided by an embodiment of the present invention includes: a second xPON physical layer processing unit, configured to process xPON physical layer signals to obtain xPON MAC frames; a second framing processing unit, configured to read the xPON MAC frame The data in the load of the xPON MAC frame is processed according to the frame header of the xPON MAC frame to obtain the PON MAC frame for the data in the load of the xPON MAC frame; the second PON physical layer processing unit is used to process the PON The MAC frame is processed at the PON physical layer to obtain a PON physical layer signal, and the PON physical layer signal is sent.

Another data transmission method provided by an embodiment of the present invention includes: processing the service layer data to obtain a passive optical network PON media access control MAC frame; processing the PON MAC frame to obtain a next-generation passive optical network xPON media access control MAC frame, the PON MAC frame is located in the load of the xPON MAC frame; xPON physical layer processing is performed on the xPON MAC frame to obtain an xPON physical layer signal, and the xPON physical layer signal is sent.

Another data transmission method provided by the embodiment of the present invention includes: processing the received xPON physical layer signal to obtain an xPON MAC frame; reading the data in the load of the xPON MAC frame; The head processes the data in the load of the xPON MAC frame to obtain a PON MAC frame; processes the PON MAC frame to obtain service layer data and sends the service layer data.

Another operator edge node provided by an embodiment of the present invention includes: at least one PON MAC layer processing unit, used to process service layer data to obtain a PON MAC frame; a first xPON MAC layer processing unit, used to process the The PON MAC frame is processed to obtain an xPON MAC frame, and the PONMAC frame is located in the load of the xPON MAC frame; the xPON physical layer processing unit is used to perform xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and Send the xPON physical layer signal.

The technical solution of the embodiment of the present invention can carry the PON media access control (MAC, MediaAccess Control) frame in the load of the xPON MAC frame, and transmit the xPON MAC frame through the xPON physical layer, so the data transmission mode of PON over xPON can be realized, Since the xONU equipment close to the ONU replaces the WDM equipment, the xONU equipment is usually colorless, that is, there is no need to provide an optical transceiver for each wavelength on the xONU, and if P2MP (Point tomultipoint, point to multipoint) is used The xPON can also realize the sharing of optical fibers, so it can effectively extend the optical transmission distance and reduce the cost of data transmission; and from the characteristics of xPON, the data transmission mode of PON overxPON does not need to support the conversion from burst mode to continuous mode, so the realization of Simple.

Description of drawings

FIG. 1 is a schematic diagram of a data transmission scheme architecture in an embodiment of the present invention;

FIG. 2 is a schematic diagram of an embodiment of a data transmission method in an embodiment of the present invention;

FIG. 3 is a schematic diagram of another embodiment of the data transmission method in the embodiment of the present invention;

FIG. 4 is a schematic diagram of another embodiment of the data transmission method in the embodiment of the present invention;

FIG. 5 is a schematic diagram of another embodiment of the data transmission method in the embodiment of the present invention;

Fig. 6 (a) is the segmental schematic diagram of PON MAC frame in the embodiment of the present invention;

Fig. 6 (b) is the recombination schematic diagram of PON MAC frame in the embodiment of the present invention;

7(a) to 7(c) are schematic diagrams of frame header processing in the embodiment of the present invention;

Fig. 8 (a) is the schematic diagram of PON MAC frame segmentation in the embodiment of the present invention;

Fig. 8 (b) is the schematic diagram of PON MAC frame reorganization in the embodiment of the present invention;

Figure 9(a) to Figure 9(c) are schematic diagrams of frame header processing in the embodiment of the present invention;

FIG. 10 is a schematic diagram of an embodiment of a data transmission system in an embodiment of the present invention;

FIG. 11 is a schematic diagram of an embodiment of an operator edge node in an embodiment of the present invention;

FIG. 12 is a schematic diagram of another embodiment of an operator edge node in the embodiment of the present invention;

Fig. 13 is a schematic diagram of another embodiment of the data transmission method in the embodiment of the present invention;

FIG. 14 is a schematic diagram of another embodiment of the data transmission method in the embodiment of the present invention;

FIG. 15 is a schematic diagram of another embodiment of an operator edge node in the embodiment of the present invention;

FIG. 16 is a schematic diagram of an xPON MAC frame structure in an embodiment of the present invention.

Detailed ways

Embodiments of the present invention provide a data transmission method, system and operator edge, which are used to reduce data transmission costs and implementation complexity.

The scheme of the embodiment of the present invention proposes a data transmission method of PON over xPON. Different PON networks are nested, for example, GPON and the next generation PON (NG-PON) are nested, wherein ONU and OLT are GPON devices, and xONU and xOLT are NG-PON equipment.

Please refer to FIG. 1 , which is a schematic diagram of an architecture of a data transmission solution in an embodiment of the present invention. In this embodiment, "PON n" represents the PON MAC frame header of the next-level network (such as TC frame/GEM frame/EPON MAC frame), and "PON n+1" represents the PON MAC frame header of the upper-level network.

The next-level network is represented as PON in this embodiment, and the upper-level network is represented as xPON in this embodiment, and xPON can be NG-PON (such as NG-GPON, NG-EPON) or WDM PON, PON over xPON ( PON is carried by xPON) to realize different PON network nesting. Among them, xONU and xOLT can be owned by the first operator, OLT1 can be owned by the second operator, and OLT2 can be owned by the third operator, so that the xPON network can be shared by multiple operators. xOLT and OLT1-OLTn can be implemented in the same physical device.

Among them, the customer edge node (CE-Node, Customer Edge Node) is usually composed of the ONU/ONT/OLT of the next-level network and is located at the edge of the customer network;

Provider Edge Node (PE-Node, Provider Edge Node) is usually composed of xONU/xOLT equipment, located at the edge of the operator network, used to add xPON connection identification (PON n+1 added) or remove xPON connection identification (PON n+1 removed), to aggregate the PON-based connection between CE-Node and CE-Node (PON-based Connection, hereinafter referred to as PON connection), and the xPON-based tunnel between PE-Node and PE-Node (xPON- based Tunnel), and finally make a complete PON-based connection between CE-Node and CE-Node.

The data transmission of PON over xPON in the embodiment of the present invention is divided into uplink transmission from CE node to PE node and downlink transmission from PE node to CE node, which are introduced respectively below:

1. Uplink transmission from CE node to PE node:

Referring to Figure 2, an embodiment of the data transmission method in the embodiment of the present invention includes:

201. Process the PON physical layer signal to obtain the PON MAC frame;

In this embodiment, the PE node can obtain the PON MAC frame by processing the PON physical layer signal sent by the CE node.

The PON MAC frame in the present embodiment can be transmission convergence (TC, Transmission Convergence) frame, or gigabit passive optical network encapsulation mode (GEM, GPONEncapsulation Method) frame in practical application, or EPON MAC frame, or other types The PON MAC frame, which is not limited here.

In this embodiment, the process that the PE node processes the PON physical layer signal to obtain the PON MAC frame is common knowledge of those skilled in the art, and is not limited here.

202. Process the PON MAC frame to obtain an xPON MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame;

In this embodiment, after the PE node obtains the PON MAC frame, in order to realize the data transmission mode of PON overxPON, the PON MAC frame can be processed to obtain the xPON MAC frame, and the PON MAC frame can be carried in the payload of the xPON MAC frame specifically. , the specific processing methods will be described in detail in subsequent embodiments.

203. Perform xPON physical layer processing on the xPON MAC frame, and send an xPON physical layer signal.

After the PE node obtains the xPON MAC frame, it can process the xPON MAC frame at the xPON physical layer to obtain the xPON physical layer signal, and send the xPON physical layer signal to the PE node at the other end, so as to realize the xPON MAC frames are transmitted in xPON.

In this embodiment, the PE node can carry the PON MAC frame in the load of the xPON MAC frame, can generate the xPON MAC frame according to the PON MAC frame, and transmit the xPON MAC frame through the xPON physical layer, so the data transmission of PON over xPON can be realized The method can extend the optical transmission distance and reduce the cost of data transmission; and the data transmission mode of PON over xPON in this embodiment does not need to support the conversion from burst mode to continuous mode, which can reduce the complexity of implementation.

For ease of understanding, the above-mentioned uplink transmission process from the CE node to the PE node is described in detail below with a specific example. In this embodiment, the CE node is specifically an ONU, and the PE node is specifically an xONU. Referring to Fig. 3, another embodiment of the data transmission method in the embodiment of the present invention includes:

301. Process the PON physical layer signal to obtain the PON MAC frame;

Step 301 in this embodiment is the same as step 201 in the embodiment shown in FIG. 2 , and will not be repeated here.

302. Segment or reassemble the PON MAC frame according to the length of the PON MAC frame and the relationship between the preset length threshold;

In this embodiment, the length of the PON MAC frame can be determined after it is acquired.

In this embodiment, a length threshold is preset, and the length threshold includes a maximum length threshold and a minimum length threshold. The length threshold may be related to the payload size of the xPON MAC frame, or may also be related to other parameters, which are not limited here.

After determining the length of the PON MAC frame, the length can be compared with the maximum length threshold and the minimum length threshold.

The specific comparison process can be as follows:

Get the length of the PON MAC frame;

Determine whether the length of the PON MAC frame is less than a preset minimum length threshold or greater than a preset maximum length threshold;

If the length of the PON MAC frame is less than the preset minimum length threshold, multiple PON MAC frames are reassembled, and the reassembled length of multiple PON MAC frames is less than or equal to the maximum length threshold;

If the length of the PON MAC frame is greater than the preset maximum length threshold, the PON MAC frame is segmented, and the length of each segment of the PON MAC frame is greater than or equal to the minimum length threshold.

303. Generate an xPON MAC frame according to segmented or reassembled data;

After the PON MAC frame is segmented or reassembled, an xPON MAC frame can be generated according to the segmented or reassembled data. The specific generation process can be as follows:

If the PON MAC frame is reassembled, the reassembled PON MAC frame is completely mapped to the payload of the xPON MAC frame. The complete mapping described here refers to the complete copying of the frame header and payload of the PON MAC frame to the xPON MAC a part of the payload of the frame;

If the PON MAC frame is segmented, multiple PON MAC frames will be obtained, and each PON MAC frame contains the frame header of the PON MAC frame and its respective segmented payload, and then each segmented PON MAC frame is mapped to The load of different xPON MAC frames;

After the mapping is completed, add a frame header to the payload of the xPON MAC frame to generate an xPON MAC frame.

It should be noted that if the PON MAC frame is a TC frame, its frame header is a TC frame header; if the PON MAC frame is a GEM frame, its frame header is a GEM frame header; if the PON MAC frame is an EPON MAC frame, its frame header is The header is the EPON MAC frame preamble;

If the xPON MAC frame is an xGEM frame, its frame header is an xGEM frame header, which includes a payload length indicator (PLI, PDU Length Indicator), a port identifier (Port ID), and a payload type indicator (PTI, PDU Type Indicator), Business type (Type) and header error control (HEC, HeaderError Control), wherein, Port ID represents the PON port identification. The least significant bit of PTI is used to indicate whether the GEM data frame is the last segment during segment processing. For example, the PTI will be set to "000" to indicate that the segment is not the last segment. Suppose the PTI is "001" Indicates that this segment is the last segment.

In this embodiment, a certain field (such as the PTI field) of the frame header of the xGEM is used to indicate that the PON MAC frame is reassembled, such as when the PTI is 111, it indicates that the load of the xGEM is the reassembly of multiple PON MAC frames.

In this embodiment, a certain field (such as the Type field) of the frame header of xGEM can also be used to indicate the payload service type of the xGEM frame, for example, the payload can be the TC/GEM frame of GPON or the LLID of EPON The EPON MAC frame can also be the TC/xGEM frame of NG-GPON or the NG-EPON MAC frame of NG-EPON marked with LLID.

If the xPON MAC frame is an NG-EPON MAC frame, its frame header is the Ethernet MAC frame header with the NG-EPON frame preamble.

In this embodiment, it is also possible to indicate the payload service type of the NG-EPON MAC frame by extending a certain field of the frame header of the NG-EPON MAC frame, such as the EthernetType (Ethernet type) field or subtype (subtype) field , for example, the payload can be GPON TC/GEM frame or EPON EPON MAC frame marked with LLID, or NG-GPON TC/xGEM frame or NG-EPON NG-EPON MAC frame marked with LLID .

In this embodiment, the preamble of the NG-EPON MAC frame can be used to indicate the reassembly of the PON MAC frame.

In this embodiment, the PON MAC frame before the PE node processing can be called "C-PON (Customer PON)", and the corresponding GPON encapsulation mode port identification (GPID, GEM Port ID)/logical link identification (LLID, Logical Link Identifier) is the inner layer connection identifier (ie PON-basedConnection identifier), which is called "C-GEM (Customer GEM or Inner GEM)" for GPON, and "C-LLID (Customer LLID or Inner LLID)" for EPON;

The xPON MAC frame processed by the PE node can be called "S-PON (Service PON)", the added xPON connection identifier is the outer layer connection identifier (that is, the xPON-based Tunnel identifier), and it is called "S-PON" for NG-GPON. GEM (Service GEM or Outer GEM)" is called "S-LLID (Service LLID or Outer LLID)" for NG-EPON.

In this embodiment, the GEM frame is the C-GEM frame, the EPON MAC frame is the frame where the C-LLID is located; the xGEM frame is the S-GEM frame, and the NG-EPON MAC frame is the frame where the S-LLID is located.

In this embodiment, for PON over xGEM, the xGEM frame header can be added to the PON MAC frame to obtain the xGEM frame, and the PON-based Connection is converged into the xPON-based Tunnel, thereby realizing TC/GEM/EPON MAC frame over xGEM (TC/ GEM frame/EPON MAC frame is carried in xGEM frame);

For PON over NG-EPON, an Ethernet frame header with NG-EPON MAC frame preamble can be added to the PON MAC frame to obtain the NG-EPON MAC frame, and the PON-based Connection can be aggregated into the xPON-based Tunnel to realize TC /GEM/EPON MAC frame overNG-EPON MAC frame.

304. Perform xPON physical layer processing, and send an xPON physical layer signal.

Step 304 in this embodiment is the same as step 203 in the embodiment shown in FIG. 2 , and will not be repeated here.

In this embodiment, the PE node xONU can reassemble or segment the PON MAC frame, and generate an xPON MAC frame according to the reorganized or segmented data, and transmit the xPON MAC frame through the xPON physical layer, which can realize PON over xPON data transmission way, and because the xONU equipment close to the ONU replaces the WDM equipment in the OTN, and the xONU equipment is usually colorless, there is no need to provide an optical transceiver for each wavelength on the xONU, so the optical transmission distance can be effectively extended. Reduce the cost of data transmission; and the data transmission mode of PON over xPON in this embodiment does not need to support the conversion from burst mode to continuous mode, which can reduce the complexity of implementation.

2. Downlink transmission from PE node to CE node:

Referring to Figure 4, another embodiment of the data transmission method in the embodiment of the present invention includes:

401. Processing xPON physical layer signals to obtain xPON MAC frames;

In this embodiment, the PE node can obtain the xPON MAC frame by processing the received xPON physical layer signal.

The xPON MAC frame in this embodiment can be an xTC frame (TC frame of NG GPON), xGEM frame, NG-EPON MAC frame or other types of xPON MAC frame in practical application, and is not specifically limited here.

In this embodiment, the process of the PE node processing the received xPON physical layer signal to obtain the xPONMAC frame is common knowledge of those skilled in the art, and is not limited here.

402. Read the data in the payload of the xPON MAC frame;

After obtaining the xPON MAC frame, in order to realize the downlink transmission from PE to CE, it is necessary to obtain the PON MAC frame from the xPON MAC frame, because in the uplink transmission from CE to PE, the PON MAC frame is located in the load of the xPON MAC frame , so the data in the payload of the xPON MAC frame can be read first.

403. Process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame;

In this embodiment, after obtaining the data in the payload of the xPON MAC frame, the PON MAC frame can be read out therefrom according to the frame header of the xPON MAC frame, and the specific manner will be described in detail in subsequent embodiments.

404. Perform PON physical layer processing, and send a PON physical layer signal.

After the PE node reads the PON MAC frame, it can perform PON physical layer processing on the PON MAC frame to obtain the PON physical layer signal, and send the PON physical layer signal to the CE node, so that the PON MAC frame can be transmitted from xPON to PON.

In this embodiment, the PE node reads the PON MAC frame from the load of the xPON MAC frame, and transmits the PON MAC frame through the PON physical layer, which can realize the data transmission mode of PON over xPON, extend the optical transmission distance, and reduce the data transmission distance. cost; and the data transmission mode of PON overxPON in this embodiment does not need to support the conversion from burst mode to continuous mode, which can reduce the complexity of implementation.

For ease of understanding, the following is a detailed description of the downlink transmission process from the PE node to the CE node with a specific example. Please refer to FIG. 5. Another embodiment of the data transmission method in the embodiment of the present invention includes:

501. Process xPON physical layer signals to obtain xPON MAC frames;

The PE node xONU obtains the xPON physical layer signal sent from the PE node xOLT at the other end, and processes the xPON physical layer signal to obtain the xPON MAC frame.

502～503, segment or reorganize the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame, delete the frame header of the xPON MAC frame to obtain the PON MAC frame;

After the PE node xONU obtains the data in the payload of the xPON MAC frame, it can segment or reassemble the data in the payload of the xPON MAC frame according to the header of the xPON MAC frame, and delete the header of the xPON MAC frame to obtain PON MAC frame, specifically, the following situations can be encountered:

A. When the frame header of the xPON MAC frame indicates that the load is a PON MAC frame, and the load of an xPON MAC frame contains multiple complete PON MAC frames, delete the frame header of the xPON MAC frame and follow the load of the xPON MAC frame The frame header of the PON MAC frame segments the data in the payload of the xPON MAC frame to obtain multiple PON MAC frames:

For example, a field (such as the Type field) of the frame header of xGEM can be used to indicate the payload service type of the xGEM frame, or a field of the frame header of the extended NG-EPON MAC frame, such as the EthernetType (Ethernet type) field or subtype (subtype) field to indicate the payload service type of the NG-EPON MAC frame.

For example, the received xPON MAC frame is an xGEM frame, and the PTI in the frame header of the xGEM frame is 111, which means that the xGEM frame is recombined from multiple PON MAC frames, and the frame header of the xGEM frame can be deleted directly , multiple PON MAC frames can be determined by dividing the payload of the xGEM frame according to the frame header of the PON MAC frame.

B. When the frame header of the xPON MAC frame indicates that the load is a PON MAC frame, and the load of an xPON MAC frame contains part of the data of a PON MAC frame, determine multiple xPON MAC frames according to the frame header of the xPON MAC frame, and delete them The frame headers of multiple xPON MAC frames are combined to obtain a PON MAC frame by combining the load data of the multiple xPON MAC frames:

For example, if the received xPON MAC frame is an xGEM frame, and the PTI in the frame header of the xGEM frame is 000, it means that the load of the xGEM frame contains part of the data of a PON MAC frame, that is, it is segmented by a PON MAC frame. If it is successful, you need to continue to receive xGEM frames until the PTI in the received xGEM frame header is 001, then delete the frame headers of these xGEM frames, and take out the payload data to combine, so that a PON MAC frame can be obtained.

It should be noted that the aforementioned xPON MAC frame may be an xGEM frame, or an NG-EPON MAC frame, and the aforementioned PON MAC frame may be a TC frame, or a GEM frame, or an EPON MAC frame.

In this embodiment, for PON over xGEM, the xGEM frame header can be removed from the xGEM frame processed by the xPON physical layer, and the PON-basedConnection can be separated from the xPON-based Tunnel, thereby realizing TC/GEM/EPON MAC frame over xGEM ( TC/GEM frame/EPONMAC frame is carried in xGEM frame);

For PON over NG-EPON, the NG-EPON MAC frame preamble can be deleted from the NG-EPON MAC frame processed by the NG-EPON physical layer, and the TC/GEM frame/EPONMAC frame can be obtained, and the PON can be distributed from the xPON-based Tunnel -based Connection, so as to realize TC/GEM/EPON MAC frame over NG-EPON MAC frame.

504. Perform PON physical layer processing, and send a PON physical layer signal.

Step 504 in this embodiment is the same as step 404 in the embodiment shown in FIG. 4 , and will not be repeated here.

In this embodiment, the xONU receives the xPON physical layer signal from the xOLT, and converts the xPON physical layer signal into an xPON MAC frame, reads the PON MAC frame from the load of the xPON MAC frame, and transmits the PON MAC frame through the PON physical layer frame, which can realize the data transmission mode of PON over xPON, and because the xONU equipment close to the ONU replaces the WDM equipment in the OTN, and the xONU equipment is usually colorless, there is no need to provide an optical transceiver for each wavelength on the xONU , so it can effectively extend the optical transmission distance and reduce the cost of data transmission; and the data transmission mode of PON overxPON does not need to support the conversion from burst mode to continuous mode, which can reduce the complexity of implementation.

For ease of understanding, the above-mentioned uplink and downlink data transmission processes are described below with two specific examples:

(1) PON MAC frame is TC/GEM/EPON MAC frame, xPON MAC frame is xGEM frame:

Uplink process:

a1. Process the PON physical layer signal to obtain TC/GEM frame/EPON MAC frame;

a2, GTC framing processing;

Step a2 in this embodiment may include two steps of mapping and framing:

a21. Segment or reassemble the TC/GEM/EPON MAC frame, each segment or reassembly is mapped to the load of an xGEM frame;

为分段处理的示意图，TC/EPON MAC帧分为多个分段，各段的TC/EPON MAC帧数据分别映射到一个xGEM帧的负载部分，每分段都复制有TC帧头/EPON MAC帧前导码；Please refer to Figure 6(a) and Figure 6(b) for details, where, as shown in Figure 6(a)

It is a schematic diagram of segmentation processing. The TC/EPON MAC frame is divided into multiple segments, and the TC/EPON MAC frame data of each segment is mapped to the payload part of an xGEM frame, and each segment is copied with the TC frame header/EPON MAC frame preamble;

Figure 6(b) is a schematic diagram of reassembly processing. Multiple TC/EPON MAC frames are simply combined, and their respective TC frame headers/EPON MAC frame preambles are reserved, which are mapped to the payload of an xGEM frame.

a22. Each segment or recombination adds an xGEM frame header to form an xGEM frame;

After the TC/GEM/EPON MAC frame is segmented or reassembled, each segmented or reassembled TC/GEM/EPONMAC frame data is mapped to the payload part of the xGEM frame, then the xGEM frame header is added, and the Type field is filled in to indicate that the payload is TC/GEM /EPON MAC frame, fill in PTI to indicate segmentation or reassembly, which constitutes an xGEM frame.

a3. Send each xGEM frame through the xPON physical layer in sequence.

Downstream process:

b1. Process xPON physical layer signals to obtain xGEM frames;

b2, taking out the payload part of the xGEM frame;

b3. According to the Type field and PTI of the xGEM frame, reorganize the data taken out of the xGEM frame to obtain the TC/GEM/EPON MAC frame;

b4. Perform PON physical layer processing on the TC/GEM/EPON MAC frame and send it to CE.

In this embodiment, the frame header of the xGEM frame needs to be processed in both the uplink and downlink directions, and the specific processing process can be shown in Figure 7(a) to Figure 7(c):

Among them, Figure 7(a) shows the uplink data transmission mode of EPON MAC over xGEM (downlink is similar), where xONU performs processing of adding xGEM frame header, and xOLT performs processing of removing xGEM frame header.

Figure 7(b) shows the uplink data transmission mode of TC over xGEM, in which xONU performs processing of adding xGEM frame header, and xOLT performs processing of removing xGEM frame header.

Figure 7(c) shows the downlink data transmission mode of TC over xGEM, where xOLT adds the xGEM frame header, and xONU removes the xGEM frame header.

(2) PON MAC frame is TC/GEM/EPON MAC frame, xPON MAC frame is NG-EPONMAC frame:

Uplink process:

a1. Process the PON physical layer signal to obtain TC/GEM frame/EPON MAC frame;

a2, coordination sublayer (RS, Reconciliation Sublayer) processing;

Step a2 in this embodiment may include two steps of mapping and framing:

a21. Segment or reassemble the TC/GEM frame/EPON MAC frame, each segment or reorganization is mapped to the load of an NG-EPON MAC frame;

Please refer to Figure 8(a) and Figure 8(b) for details, wherein Figure 8(a) shows a schematic diagram of segmentation processing, the TC/GEM frame is divided into multiple segments, and the TC/GEM frame of each segment The data are respectively mapped to the payload part of an NG-EPON MAC frame, and each segment is copied with a TC/GEM frame header;

Figure 8(b) is a schematic diagram of reassembly processing. Multiple TC/GEM frames are simply assembled, and their respective TC/GEM frame headers are reserved, which are mapped to the payload part of an NG-EPON MAC frame.

a22. Add an Ethernet frame header with NG-EPON MAC frame preamble for each segmentation or reassembly, fill in the EthernetType field to indicate that the load is a TC/GEM/EPON MAC frame, modify the preamble to indicate segmentation or reassembly, and form NG - EPON MAC frame;

After the TC/GEM/EPON MAC frame is segmented or reassembled, each segmented or reassembled TC/GEM frame data is mapped to the load part of the NG-EPON MAC frame, and then the Ethernet frame header with the NG-EPON MAC frame preamble is added , which constitutes an NG-EPON MAC frame. A NG-EPON MAC frame preamble includes LLID start delimiter (SLD, 8 bits), LLID (16 bits) and cyclic redundancy check (CRC, 8 bits).

a3. Send each NG-EPON MAC frame through the xPON physical layer in sequence.

Downstream process:

b1. Process xPON physical layer signals to obtain NG-EPON MAC frames;

b2. Remove the Ethernet frame header with the NG-EPON MAC frame preamble to obtain the TC/GEM/EPONMAC frame;

b3. According to the preamble of the NG-EPON MAC frame, recombine the data extracted from the preamble of the NG-EPON MAC frame to obtain the TC/GEM/EPON MAC frame;

b4. Perform PON physical layer processing on the TC/GEM/EPON MAC frame and send it to CE.

In this embodiment, the frame header of the NG-EPON MAC frame needs to be processed in the upstream and downstream directions, and the specific processing process can be as shown in Figure 9 (a) to Figure 9 (c):

Among them, Figure 9(a) shows the uplink data transmission mode of GEM over NG-EPON MAC (downlink is similar), where xONU performs the processing of adding NG-EPON MAC frame header, and xOLT performs the processing of removing NG-EPON MAC frame header.

Figure 9(b) shows the uplink data transmission mode of TC over NG-EPON MAC, where xONU adds NG-EPON MAC frame header, and xOLT removes NG-EPON MAC frame header.

Figure 9(c) shows the downlink data transmission mode of TC over NG-EPON MAC, where xOLT adds the NG-EPON MAC frame header, and xONU removes the NG-EPON MAC frame header.

The data transmission system in the embodiment of the present invention is described below, please refer to FIG. 10, the data transmission system in the embodiment of the present invention includes:

The user edge node 1001 is configured to receive data sent by the user terminal side, and send the data to the operator edge node 1002 through a PON physical layer signal;

The operator edge node 1002 is used to process the PON physical layer signal sent by the user edge node 1001 to obtain the PON MAC frame sent by the user edge node 1001, and to process the PON MAC frame to obtain an xPON MAC frame, so that the PON MAC frame is located in the xPON MAC frame In the frame load, the xPON physical layer processing is performed on the xPON MAC frame to obtain the xPON physical layer signal, and the xPON physical layer signal is sent.

In this embodiment, the user edge node 1001 may include an ONU and an OLT, and the operator edge node 1002 may include an xOUN and an xOLT.

The PON MAC frame and the xPON MAC frame in this embodiment have the same meaning as the PON MAC frame and the xPON MAC frame in the foregoing embodiments, and will not be repeated here.

This embodiment describes the uplink data transmission mode from the user edge node 1001 to the operator edge node 1002. The following describes the downlink data transmission mode from the operator edge node 1002 to the user edge node 1001. Also refer to FIG. 10, the present invention Another embodiment of the communication system in the embodiment includes:

The operator edge node 1002 is used to process the received xPON physical layer signal to obtain the xPON MAC frame, read the data in the load of the xPON MAC frame, and analyze the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame Process to obtain a PON MAC frame, perform PON physical layer processing on the PONMAC frame to obtain a PON physical layer signal, and send a PON physical layer signal;

The user edge node 1001 is configured to receive the PON physical layer signal sent by the operator edge node 1002 .

In this embodiment, the user edge node 1001 may include an ONU and an OLT, and the operator edge node 1002 may include an xOUN and an xOLT.

The PON MAC frame and the xPON MAC frame in this embodiment have the same meaning as the PON MAC frame and the xPON MAC frame in the foregoing embodiments, and will not be repeated here.

In this embodiment, the operator edge node 1002 can convert the PON MAC frame and the xPON MAC frame to each other, and can transmit the xPON MAC frame through the xPON physical layer, and transmit the PON MAC frame through the PON physical layer, so the data of PON over xPON can be realized The transmission mode extends the optical transmission distance and effectively reduces the cost of data transmission; and the data transmission mode of PON over xPON in this embodiment does not need to support the conversion from burst mode to continuous mode, which can reduce the complexity of implementation.

The following describes the embodiment of the operator's edge node in the embodiment of the present invention. Please refer to FIG. 11. An embodiment of the operator's edge node in the embodiment of the present invention includes:

The first PON physical layer processing unit 1101 is used to process PON (such as GPON or EPON) physical layer signals to obtain PON MAC frames;

The first framing processing unit 1103 is used to process the PON MAC frame to obtain an xPON MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame;

For example, for PON over xGEM, you can add xGEM frame header to PON MAC frame to get xGEM frame, and converge PON-based Connection into xPON-based Tunnel, so as to realize TC/GEM/EPON MAC frame over xGEM (TC/GEM frame/EPON MAC frames are carried in xGEM frames);

For example, for PON over NG-EPON, an Ethernet frame header with NG-EPONMAC frame preamble can be added to the PON MAC frame to obtain the NG-EPON MAC frame, and the PON-basedConnection can be aggregated into the xPON-based Tunnel, thereby realizing TC/ GEM/EPON MAC frame over NG-EPON MAC frame.

The first xPON physical layer processing unit 1104 is configured to perform xPON (such as 10G-GPON or 10G-EPON) physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal and send the xPON physical layer signal.

The operator edge node in this embodiment may further include:

The multiplexing unit 1102 is used to segment or reorganize the PON MAC frame according to the length of the PON MAC frame obtained by the first PON physical layer processing unit 1101 and the relationship between the preset length threshold, and segment or reorganize the PON MAC frame The MAC frame is sent to the first framing processing unit 1103 for processing.

This embodiment describes the uplink data transmission mode from a CE node to a PE node. For ease of understanding, a specific application scenario is used for illustration below:

In this embodiment, the first PON physical layer processing unit 1101 can obtain the PON MAC frame by processing the PON physical layer signal.

After obtaining the PON MAC frame, the multiplexing unit 1102 can determine its length, compare the length with the preset maximum length threshold and minimum length threshold, and segment or reassemble the PON MAC frame according to the comparison result.

Both the maximum length threshold and the minimum length threshold are preset values, which are specifically related to practical applications, and are not limited here.

The specific comparison process is consistent with the comparison process described in the aforementioned method embodiment shown in FIG. 3 , and will not be repeated here.

After the multiplexing unit 1102 segments or reassembles the PON MAC frame, the first framing processing unit 1103 can generate an xPON MAC frame according to the segmented or reassembled data, and the specific generation process is the same as the method embodiment shown in Figure 2 above. The generation process described in is consistent and will not be repeated here.

After the first framing processing unit 1103 obtains the xPON MAC frame, the first xPON physical layer processing unit 1104 can perform xPON physical layer processing on the xPON MAC frame to obtain the xPON physical layer signal, and send the xPON physical layer signal, thereby being able to Realize the transmission of xPON MAC frames carrying PON MAC frames in xPON.

In this embodiment, the multiplexing unit 1102 can reorganize or segment the PON MAC frame, the first framing processing unit 1103 generates an xPON MAC frame according to the reorganized or segmented data, and the first xPON physical layer processing unit 1104 passes the xPON The physical layer transmits the xPON MAC frame, so the data transmission mode of PON over xPON can be realized, and the cost of data transmission is effectively reduced; and the data transmission mode of PON over xPON in the present embodiment does not need to support the conversion from burst mode to continuous mode, Can reduce implementation complexity.

Please refer to Figure 12, another embodiment of the operator edge node in the embodiment of the present invention includes:

The second xPON physical layer processing unit 1201 is used to process xPON (such as 10G-GPON or 10G-EPON) physical layer signals to obtain xPON MAC frames;

The second framing processing unit 1203 is used to read the data in the load of the xPON MAC frame, and process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PONMAC frame;

For example, for PON over xGEM, the xGEM frame header can be removed from the xGEM frame processed by the xPON physical layer, and the PON-based Connection can be separated from the xPON-based Tunnel, so as to realize TC/GEM/EPON MAC frame over xGEM (TC/GEM frame/EPON MAC frame is carried in xGEM frame);

For example, for PON over NG-EPON, the NG-EPON MAC frame preamble can be deleted from the NG-EPON MAC frame processed by the NG-EPON physical layer, and the TC/GEM frame/EPONMAC frame can be obtained and distributed from the xPON-based Tunnel PON-based Connection, so as to realize TC/GEM/EPON MAC frame over NG-EPON MAC frame.

The second PON physical layer processing unit 1204 is used to carry out PON (such as GPON or EPON) physical layer processing to the PON MAC frame, obtain the PON physical layer signal and send the PON physical layer signal;

For GPON, the GPM sublayer function of GPON is completed. When the PON data link layer frame is a GTC TC frame, the preamble of the GTC TC frame needs to be regenerated; for EPON, the PHY layer function of EPON is completed, including PDM, PMA , PCS, when the PON data link layer frame is an EPON MAC frame, the preamble (preamble) of the EPON MAC frame needs to be regenerated.

The operator edge node in this embodiment may further include:

The demultiplexing unit 1202 is configured to segment or reassemble the data in the load of the xPONMAC frame obtained by the second xPON physical layer processing unit 1201, and send the segmented or reassembled data to the second framing processing unit 1203 for further processing. deal with.

This embodiment describes the uplink data transmission mode from a PE node to a CE node. For ease of understanding, a specific application scenario is used for illustration below:

In this embodiment, the second xPON physical layer processing unit 1201 can obtain the xPON MAC frame by processing the xPON physical layer signal.

The xPON MAC frame in this embodiment may be an xGEM frame, or an NG-EPON MAC frame, or another type of xPON MAC frame in practical applications, which is not specifically limited here.

In this embodiment, the process of the second xPON physical layer processing unit 1201 processing the xPON physical layer signal to obtain the xPON MAC frame is common knowledge of those skilled in the art, and is not limited here.

After the second xPON physical layer processing unit 1201 obtains the data in the load of the xPON MAC frame, the demultiplexing unit 1202 can segment or recombine the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame, The second framing processing unit 1203 obtains the PON MAC frame by deleting the frame header of the xPON MAC frame. The specific process is consistent with the process described in the embodiment shown in FIG. 5 above, and will not be repeated here.

After the second framing processing unit 1203 reads the PON MAC frame, the second PON physical layer processing unit 1204 can perform PON physical layer processing to obtain a PON physical layer signal, and send the PON physical layer signal, thereby realizing the PON MAC frames are transferred from xPON to PON.

In this embodiment, the demultiplexing unit 1202 can reorganize or segment the PON MAC frame, the second framing processing unit 1203 generates an xPON MAC frame according to the reorganized or segmented data, and the second PON physical layer processing unit 1204 passes the xPON The physical layer transmits the xPON MAC frame, so the data transmission mode of PON over xPON can be realized, and the data transmission cost is reduced; and in the present embodiment, the data transmission mode of PON over xPON does not need to support the conversion from burst mode to continuous mode, and can Reduce implementation complexity.

The embodiment of the present invention also provides a data transmission method, as shown in Figure 13, including:

1301. Process the service layer data to obtain a PON MAC frame;

In this embodiment, the service layer data may be an IP data packet, an Ethernet frame or a time-division multiplexed data packet. The PON MAC frame in the present embodiment can be transmission convergence (TC, Transmission Convergence) frame, or gigabit passive optical network encapsulation mode (GEM, GPONEncapsulation Method) frame in practical application, or EPON MAC frame, or other types The PON MAC frame, which is not limited here.

In this embodiment, the process of the PE node xOLT encapsulating data to obtain the PON MAC frame is common knowledge of those skilled in the art, and is not limited here.

1302. Process the PON MAC frame to obtain an xPON MAC frame, so that the PON MAC frame is located in the load of the xPON MAC frame;

In this embodiment, after the PE node processes the received data and obtains the PON MAC frame, in order to realize the PON over xPON data transmission mode, the PON MAC frame can be processed to obtain the xPON MAC frame, specifically, the PON MAC frame can be carried In the load of xPON MAC frame, for example, xGEM frame header can be added to PON MAC frame to obtain xGEM frame, and PON-based connection can be aggregated into xPON-based tunnel, so as to realize TC/GEM/EPON MAC frame over xGEM (TC/GEM /EPON MAC frame is carried in xGEM frame); as another example, an Ethernet frame header with NG-EPON MAC frame preamble can be added to a PON MAC frame to obtain an NG-EPON MAC frame, thereby realizing TC/GEM/EPON MAC frame Carried in NG-EPON MAC frame. In the process of processing the PONMAC frame to obtain the xPON MAC frame, the PON MAC frame can also be segmented or reassembled according to the content in the foregoing embodiments.

In order to make the xPON MAC frame transparent to the bearer of the PON MAC, that is, the transmission delay of all data on the xPON is the same, a method for encapsulating the xPON MAC frame is provided in the embodiment of the present invention, so that the structure of the xPON MAC frame follows The PON bandwidth divides fixed transmission byte blocks (data partitions in the figure) for each PON, and ensures that the order of these byte blocks remains unchanged. As shown in Figure 16, when the bandwidth of xPON is 4 times the bandwidth of PON, and the PON MAC frame is a TC frame, the encapsulated xPON TC frame includes 4 fixed PON TC frame data partitions.

1303. Perform xPON physical layer processing on the xPON MAC frame, and send an xPON physical layer signal.

After the PE node xOLT obtains the xPON MAC frame, it can process the xPON MAC frame at the xPON physical layer to obtain the xPON physical layer signal, and send the xPON physical layer signal to the PE node xONU at the other end, so that it can carry the PON MAC Frame xPON MAC frames are transported in xPON.

The above embodiments of the present invention can not only realize the intercommunication between the optical network equipment and other equipment sending service layer data, but also carry the PON MAC frame in the load of the xPON MAC frame, and transmit the xPON MAC frame through the xPON physical layer, so it can realize The PON over xPON data transmission method extends the optical transmission distance and reduces the data transmission cost; and in this embodiment, the PON over xPON data transmission method does not need to support the conversion from burst mode to continuous mode, which reduces the implementation complexity.

Another data transmission method is provided in the embodiment of the present invention, including:

1401. Receive an xPON physical layer signal, and process the xPON physical layer signal to obtain an xPONMAC frame;

In this embodiment, the PE node xOLT processes the received xPON physical layer signal to obtain the xPON MAC frame.

The xPON MAC frame in this embodiment can be an xTC frame (TC frame of NG GPON), xGEM frame, NG-EPON MAC frame or other types of xPON MAC frame in practical application, and is not specifically limited here.

In this embodiment, the process that the PE node xOLT processes the received xPON physical layer signal to obtain the xPON MAC frame is common knowledge of those skilled in the art, and is not limited here.

1402. Read the data in the payload of the xPON MAC frame;

After obtaining the xPON MAC frame, in order to transmit data to other non-optical network devices through PON, it is necessary to obtain the PON MAC frame from the xPON MAC frame, because in the transmission of PON over xPON, the PON MAC frame is located in the xPON MAC frame In the payload, the data in the payload of the xPON MAC frame can be read first.

1403. Process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame;

In this embodiment, after obtaining the data in the payload of the xPON MAC frame, the xOLT can read the PON MAC frame from it according to the frame header of the xPON MAC frame. For details, refer to the above-mentioned embodiment. If the PON MAC frame is segmented or reassembled at the xONU, the xOLT also needs to reorganize or segment the data in the payload of the xPON MAC frame accordingly to obtain the correct PON MAC frame.

1404. Process the obtained PON MAC frame to obtain and send the service layer data.

After the PE node xOLT obtains the PON MAC frame from the xPON MAC frame, it processes the PON MAC frame to obtain and send the service layer data that can be transmitted by the network equipment connected to the PE node. For example, if the xOLT is connected to the Ethernet, it is necessary to process the PON MAC frame to get the Ethernet frame, and then send the Ethernet frame to the Ethernet connected to the xOLT.

In this embodiment, the xOLT can read the PON MAC frame from the load of the xPON MAC frame, and then generate and send the service layer data of the PON MAC frame, which can realize the data transmission mode of PON over xPON, extend the optical transmission distance, reduce Data transmission costs; and in this embodiment, the data transmission mode of PONover xPON does not need to support the conversion from burst mode to continuous mode, which reduces the complexity of implementation.

The embodiment of the present invention also provides an operator edge node, which is used to implement the method shown in FIG. 13 and/or FIG. 14. The operator edge node, as shown in FIG. 15, includes:

At least one PON MAC layer processing unit 1501 is used to process the service layer data to obtain a PON MAC frame, wherein the service layer data can be an IP packet or an Ethernet frame.

The first xPON MAC layer processing unit 1503 is used to process the PON MAC frame obtained by the PON MAC layer processing unit 1501 to obtain an xPON MAC frame, and the PON MAC frame is located in the load of the xPONMAC frame. The specific processing method can refer to the above-mentioned embodiments.

When the operator edge node includes two or more PON MAC layer processing units, in order to make the bearer of the xPON MAC frame transparent to the PON MAC, that is, the transmission delay of all data on the xPON is the same, A method for encapsulating xPON MAC frames is provided in the embodiment of the present invention, so that the xPON MAC frame structure divides fixed transmission byte blocks (data partitions in the figure) for each PON according to the PON bandwidth, and ensures the integrity of these byte blocks The order does not change. As shown in Figure 16, when the bandwidth of xPON is 4 times the bandwidth of PON, and the PON MAC frame is a TC frame, the encapsulated xPON TC frame includes 4 fixed PON TC frame data partitions.

The xPON physical layer processing unit 1504 is configured to process the xPON MAC frame, obtain the xPON physical layer signal, and send the xPON physical layer signal.

The operator edge node in this embodiment may further include:

The multiplexing/demultiplexing unit 1502 is used to segment or reorganize the PON MAC frame according to the length of the PONMAC frame obtained by the PON MAC layer processing unit 1501 and the relationship between the preset length threshold, and segment or reassemble the PON MAC frame. The PON MAC frame is sent to the first xPON MAC layer processing unit 1503 for processing.

The xPON physical layer processing unit 1504 in the operator's edge node in the embodiment of the present invention can also be used to convert the received xPON physical layer signal into an xPON MAC frame.

The operator edge node in this embodiment may further include: a second xPON MAC frame processing unit 1505, configured to read the data in the load of the xPON MAC frame obtained by the xPON physical layer processing unit 1504, according to the xPON MAC frame The frame header processes the data in the load of the xPON MAC frame to obtain the PON MAC frame, and the specific processing method can refer to the above-mentioned embodiment; when the operator edge node includes a multiplexing/demultiplexing unit 1502, the multiplexing/demultiplexing The unit 1502 is also used to segment or reorganize the data in the load of the xPON MAC frame obtained by the second xPON MAC frame processing unit 1505, and send the segmented or reorganized data to the PON MAC frame processing unit 1501 for processing. The PON MAC frame processing unit is also used to process the received PON MAC frame to obtain service layer data.

The first xPON MAC layer processing unit 1503 and the second xPONMAC layer processing unit 1505 in the above-mentioned embodiments of the present invention can be set separately, and can also be set in the same module, and the multiplexing/demultiplexing unit 1502 can also be set separately. multiplexing unit and demultiplexing unit.

In this embodiment, the operator's edge node can read the PONMAC frame from the load of the xPON MAC frame, and then generate and send the service layer data of the PON MAC frame, which can realize the data transmission mode of PON overxPON and extend the optical transmission distance. Reduce data transmission costs; and in this embodiment, the data transmission mode of PON over xPON does not need to support the conversion from burst mode to continuous mode, which reduces the complexity of implementation.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the above-mentioned storage The medium can be read-only memory, magnetic or optical disk, etc.

A data transmission method, system and related equipment provided by the present invention have been introduced in detail above. For those of ordinary skill in the art, according to the idea of the embodiment of the present invention, there will be changes in the specific implementation and application scope. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (13)

1. A data transmission method, characterized in that, comprising: Process the passive optical network PON physical layer signal to obtain the PON media access control MAC frame; The PON MAC frame is processed to obtain a next-generation passive optical network xPON media access control MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame; Carrying out xPON physical layer processing to described xPON MAC frame obtains xPON physical layer signal, and sends described xPON physical layer signal; The PON MAC frame is processed to obtain the next generation passive optical network xPON media access control MAC frame including: According to the relationship between the length of the PON MAC frame and the preset length threshold, the PON MAC frame is segmented or reassembled; An xPON MAC frame is generated from segmented or reassembled data, each segmented or reassembled data being in the payload of the xPON MAC frame. 2. method according to claim 1, is characterized in that, described according to the relation between the length of described PON MAC frame and the preset length threshold, segmenting or reorganizing described PON MAC frame comprises: Obtain the length of the PON MAC frame; Judging whether the length of the PON MAC frame is less than a preset minimum length threshold or greater than a preset maximum length threshold; If the length of the PON MAC frame is less than the preset minimum length threshold, multiple PONMAC frames are reorganized, and the reorganized length of the multiple PON MAC frames is less than or equal to the maximum length threshold; If the length of the PON MAC frame is greater than the preset maximum length threshold, the PON MAC frame is segmented, and the length of each segment of the PON MAC frame is greater than or equal to the minimum length threshold. 3. method according to claim 1, is characterized in that, described generation xPON MAC frame according to the data of segmentation or recombination comprises: fully mapping the reassembled PON MAC frame to the load of the xPON MAC frame, or mapping each segment of the PON MAC frame to the load of a different xPON MAC frame; Adding a frame header to the payload of the xPON MAC frame generates an xPON MAC frame. 4. The method of claim 3, wherein, The frame header includes a payload type indication PTI or a preamble, and the payload type indicates that the PTI or the preamble is used to indicate that the load of the xPON MAC frame contains a PON MAC frame; or, The frame header includes a service type parameter field or a newly added parameter field, and the service type parameter field or the newly added parameter field is used to indicate that the load of the xPON MAC frame contains a PON MAC frame. 5. A data transmission method, characterized in that, comprising: Process xPON physical layer signals to obtain xPON MAC frames; Read the data in the payload of the xPON MAC frame; Process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame; Performing PON physical layer processing on the PON MAC frame to obtain a PON physical layer signal, and sending the PON physical layer signal; According to the frame header of the xPON MAC frame, the data in the load of the xPON MAC frame is processed to obtain the PON MAC frame including: When the frame header of the xPON MAC frame represents a plurality of complete PON MAC frames in the load of the xPON MAC frame, delete the frame header of the xPON MAC frame; According to the header of the PON MAC frame in the load of the xPON MAC frame, the data in the load of the xPON MAC frame is segmented to obtain a plurality of PON MAC frames; or, When the frame header of the xPON MAC frame indicates that the load of an xPON MAC frame includes a part of the data of a PON MAC frame, a plurality of xPONMAC frames are determined according to the frame header of the xPON MAC frame; Deleting the frame headers of the determined multiple xPON MAC frames, combining the load data of the multiple xPON MAC frames to obtain a PON MAC frame. 6. A data transmission system, characterized in that, comprising: The user edge node is configured to receive the data sent by the user terminal side, and send the data to the operator edge node; The operator edge node is used to process the PON physical layer signal in the data to obtain a PON MAC frame, and process the PON MAC frame to obtain an xPON MAC frame, and the PONMAC frame is located at the end of the xPON MAC frame In the load, performing xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and sending the xPON physical layer signal; When processing the PON MAC frame to obtain the xPON MAC frame, the operator edge node is specifically used for: According to the relationship between the length of the PON MAC frame and the preset length threshold, the PON MAC frame is segmented or reassembled; An xPON MAC frame is generated from segmented or reassembled data, each segmented or reassembled data being in the payload of the xPON MAC frame. 7. A data transmission system, characterized in that, comprising: The operator's edge node is used to process the xPON physical layer signal in the received data to obtain the xPON MAC frame, read the data in the load of the xPON MAC frame, and process the xPON MAC frame according to the frame header of the xPON MAC frame. Processing the data in the load of the MAC frame to obtain a PON MAC frame, performing PON physical layer processing on the PON MAC frame to obtain a PON physical layer signal, and sending the PON physical layer signal; The user edge node is configured to receive the PON physical layer signal sent by the operator edge node; When processing the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame, the operator edge node is specifically used for: When the frame header of the xPON MAC frame represents a plurality of complete PON MAC frames in the load of the xPON MAC frame, delete the frame header of the xPON MAC frame; According to the header of the PON MAC frame in the load of the xPON MAC frame, the data in the load of the xPON MAC frame is segmented to obtain a plurality of PON MAC frames; or, When the frame header of the xPON MAC frame indicates that the load of an xPON MAC frame includes a part of the data of a PON MAC frame, a plurality of xPONMAC frames are determined according to the frame header of the xPON MAC frame; Deleting the frame headers of the determined multiple xPON MAC frames, combining the load data of the multiple xPON MAC frames to obtain a PON MAC frame. 8. A carrier edge node, characterized in that it comprises: The first PON physical layer processing unit is used to process PON physical layer signals to obtain PONMAC frames; The first framing processing unit is used to process the PON MAC frame to obtain an xPON MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame; The first xPON physical layer processing unit is used to perform xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and send the xPON physical layer signal; The operator edge node also includes: The multiplexing unit is used to segment or reassemble the PON MAC frame according to the relationship between the length of the PON MAC frame obtained by the first PON physical layer processing unit and the preset length threshold, and segment or reassemble The subsequent PON MAC frame is sent to the first framing processing unit for processing. 9. A carrier edge node, characterized in that it comprises: The second xPON physical layer processing unit is used to process xPON physical layer signals to obtain xPON MAC frames; The second framing processing unit is used to read the data in the load of the xPON MAC frame, and process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame; According to the frame header of the xPON MAC frame, processing the data in the load of the xPON MAC frame to obtain the PON MAC frame includes: when the frame header of the xPON MAC frame indicates that the load of an xPON MAC frame contains multiple complete During the PON MAC frame, delete the frame header of the xPON MAC frame; segment the data in the load of the xPON MAC frame according to the frame header of the PON MAC frame in the load of the xPON MAC frame to obtain multiple PON MAC frame; Or, when the frame header of described xPON MAC frame represents the partial data of a PON MAC frame in the load of described xPON MAC frame, determine a plurality of xPON MAC frames according to the frame header of described xPON MAC frame; Delete all Describe the frame header of a plurality of xPON MAC frames determined, and combine the data of the load of the plurality of xPON MAC frames to obtain a PON MAC frame; The second PON physical layer processing unit is used to perform PON physical layer processing on the PON MAC frame to obtain a PON physical layer signal, and send the PON physical layer signal; The operator edge node also includes: The demultiplexing unit is used to segment or reorganize the data in the load of the xPON MAC frame obtained by the second xPON physical layer processing unit, and send the segmented or reorganized data to the second framing process unit is processed. 10. A data transmission method, characterized in that, comprising: Process the business layer data to obtain the passive optical network PON media access control MAC frame; The PON MAC frame is processed to obtain a next-generation passive optical network xPON media access control MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame; Carrying out xPON physical layer processing to described xPON MAC frame obtains xPON physical layer signal, and sends described xPON physical layer signal; The PON MAC frame is processed to obtain the next generation passive optical network xPON media access control MAC frame including: According to the relationship between the length of the PON MAC frame and the preset length threshold, the PON MAC frame is segmented or reassembled; An xPON MAC frame is generated from segmented or reassembled data, each segmented or reassembled data being in the payload of the xPON MAC frame. 11. A data transmission method, characterized in that, comprising: Process the received xPON physical layer signal to obtain xPON MAC frame; Read the data in the payload of the xPON MAC frame; Process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame; Process the PON MAC frame to obtain service layer data and send the service layer data; According to the frame header of the xPON MAC frame, the data in the load of the xPON MAC frame is processed to obtain the PON MAC frame including: When the frame header of the xPON MAC frame represents a plurality of complete PON MAC frames in the load of the xPON MAC frame, delete the frame header of the xPON MAC frame; According to the header of the PON MAC frame in the load of the xPON MAC frame, the data in the load of the xPON MAC frame is segmented to obtain a plurality of PON MAC frames; or, When the frame header of the xPON MAC frame indicates that the load of an xPON MAC frame includes a part of the data of a PON MAC frame, a plurality of xPONMAC frames are determined according to the frame header of the xPON MAC frame; Deleting the frame headers of the determined multiple xPON MAC frames, combining the load data of the multiple xPON MAC frames to obtain a PON MAC frame. 12. A carrier edge node, characterized in that it comprises: At least one PON MAC layer processing unit is used to process the business layer data to obtain the PONMAC frame; The first xPON MAC layer processing unit is used to process the PON MAC frame to obtain an xPON MAC frame, and the PON MAC frame is located in the load of the xPON MAC frame; the processing of the PON MAC frame to obtain an xPON MAC frame include: According to the relationship between the length of the PON MAC frame and the preset length threshold, the PON MAC frame is segmented or reassembled; the xPON MAC frame is generated according to the segmented or reassembled data, and each segment or reassembled The data is located in the payload of the xPON MAC frame; The xPON physical layer processing unit is used to perform xPON physical layer processing on the xPON MAC frame to obtain an xPON physical layer signal, and send the xPON physical layer signal; The operator edge node also includes a second xPON MAC layer processing unit, and the xPON physical layer processing unit is also used to process received xPON physical layer signals to obtain xPON MAC frames; The second xPON MAC layer processing unit is used to read the data in the load of the xPON MAC frame, and process the data in the load of the xPON MAC frame according to the frame header of the xPON MAC frame to obtain the PON MAC frame; the data in the load of the xPON MAC frame is processed to obtain the PON MAC frame and includes: when the frame header of the xPON MAC frame indicates that the load of an xPON MAC frame contains multiple complete PON MAC frames, delete the The frame header of the xPON MAC frame; according to the frame header of the PON MAC frame in the load of the xPON MAC frame, the data in the load of the xPON MAC frame is segmented to obtain multiple PON MAC frames; or, when the xPON MAC frame When the frame header indicates that the load of an xPON MAC frame contains part of the data of a PON MAC frame, determine multiple xPON MAC frames according to the frame header of the xPON MAC frame; delete the frame headers of the determined multiple xPON MAC frames , combining the load data of the multiple xPON MAC frames to obtain a PON MAC frame. 13. The operator edge node according to claim 12, wherein the PON MAC layer processing unit is also used to process the PON MAC frame obtained by the second xPON MAC layer processing unit to obtain service layer data And send the business layer data.

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