WO2017197856A1 - Data communication method, apparatus and system - Google Patents

Abstract

Provided is a data communication method. The method comprises: a receiving device receiving, from each channel, a forward error correction codeword (FEC codeword) sent by a sending device; the receiving device obtaining a delay deviation of each channel; the receiving device parsing a data message from the FEC codeword to obtain a reception time when a first bit in the data message is received on each channel; the receiving device adjusting the reception time when the first bit in the data message is received on each channel according to the delay deviation of each channel; and the receiving device recombining received messages according to the adjusted reception time of the first bit in the data message, such that the delay measurement accuracy of each channel in a next-generation EPON system can reach a bit level.

Description

Data communication method, device and system Technical field

The present invention relates to the field of optical communication technologies, and in particular, to a data communication method, apparatus, and system.

Background technique

Passive Optical Network (PON) technology is a point-to-multipoint fiber access technology. With the continuous development of technology, EPON (Ethernet Passive Optical Network) and GPON have emerged. (Gigabit passive Optical Network, Gigabit-capacity passive optical network) and NG PON (Next-Generation PON). 1 shows a network structure of an existing EPON. The EPON 100 may include at least one optical line terminal (OLT) 110, an optical distribution network 120 (ODN), and a plurality of optical network units (ONUs) 130. The ODN sends Ethernet packets to multiple ONUs. To distinguish between different ONUs, you need to set a unique Logical Link Identifier (LLID) for each ONU to uniquely identify each ONU.

In order to further expand the application of PON and meet the greater bandwidth demand in the future, based on the original EPON and 10GEPON, 100G EPON is proposed. 100GEPON is the next-generation EPON system after 10G EPON. At present, the physical layer of EPON architecture can only achieve 25Gbps. The rate, to reach the system rate of 100Gbps, needs to bind 4 channels of 25Gbps to carry 100Gbps traffic. In the EPON of the 100G, the OLT distributes the data packets of one service flow to the four wavelength channels for transmission, and the ONU needs to receive the data packets from the four wavelength channels, and the data packets of the four channels are received. Reorganize to form a business flow.

In the prior art, the ONU reassembles the data packet according to the receiving time of the first bit in the received data packet. When the ONU receives and reassembles the data packet, it assumes that the overall delay of each wavelength channel from the transmitting side to the receiving side is the same and constant. In actual situations, each channel may pass different lengths of optical fibers and different wavelengths. If the channel uses different wavelengths, the delay between the channels of the wavelengths is not the same. This makes the ONU receive the first bit of the data packet according to the calculation, and the data packet of the ONU is reorganized. sequence.

Summary of the invention

Embodiments of the present invention provide a data communication method, related device, and system, which are used to solve data that is reassembled by a receiving device due to a delay of a wavelength channel in a next-generation EPON system. The problem of out-of-order of the message enables the delay measurement accuracy of each channel of the next-generation EPON system to reach the bit level, so that the receiving device can accurately reassemble the message regardless of the circumstances, which greatly improves the reliability of the system. Sex.

In one aspect, an embodiment of the present application provides a data communication method, which is applied to a receiving device in a passive optical network system, where the receiving device receives data through at least two channels, and the method includes:

Receiving, by the receiving device, a forward error correction code code word FEC codeword sent by the sending device; the receiving device obtains a delay deviation of each channel; the receiving device parses out from the FEC codeword Receiving, by the data packet, a receiving time of receiving the first bit in the data packet from each channel; the receiving device adjusting the receiving the datagram on each channel according to the delay deviation of each channel The receiving time of the first bit in the text; the receiving device reassembles the received message according to the receiving time of the first bit in the adjusted data message. Through the solution provided by the embodiment, the delay measurement accuracy of each channel of the next-generation EPON system can reach the bit level, so that the receiving device can accurately reassemble the message regardless of the circumstances, thereby greatly improving the system. reliability.

In a possible design, the receiving device obtains the delay deviation of each channel specifically includes:

When the receiving device detects that the number of the FEC codeword received on each channel is the same, the recorded receiving time of the specific bit of the FEC codeword received by each channel; and calculating each time according to the receiving time of the recorded specific bit The delay of the channel.

In one possible design, the receiving device records the reception time of a particular bit of the FEC codeword received by each channel.

In a possible design, the receiving device obtains the delay deviation of each channel specifically includes:

When the receiving device detects that the numbers of the FEC codewords received on the respective channels are the same, the delay deviation of each channel is calculated according to the receiving time of the recorded specific bits.

In a possible design, the receiving device obtains the delay deviation of each channel specifically includes:

When the receiving device detects that the synchronization header Sync Header of the FEC codeword received by each channel is a specific value, the receiving time of the specific bit of the FEC codeword is received according to the recorded channel, and the delay of each channel is calculated. Time offset; wherein the Sync Header is a sync header Sync Header in the parity block Parity Block in the FEC codeword.

In a possible design, the receiving device adjusts according to the delay deviation of each channel. The receiving time of receiving the first bit in the data packet on each channel specifically includes:

The receiving device compensates for the arrival time of the first bit of the data packet on each channel according to the delay deviation of each channel, and obtains the data packet after compensation on each channel. The reception time of the first bit.

In a possible design, the receiving device reassembling the received message according to the receiving time of the first bit in the adjusted data packet includes:

The receiving device reassembles the received message according to the sequence of the arrival time of the first bit of the data data packet on the adjusted channel.

On the other hand, an embodiment of the present application provides a receiving device, where the receiving device includes:

The receiving port unit receives the forward error correction code code word FEC codeword sent by the sending device by using a channel corresponding to the interface unit, and sends the received FEC codeword to the FEC processor; the FEC processor is configured to The received FEC codeword is parsed, and the parsed data packet is sent to a timer; the timer is configured to record a receiving time of receiving the first bit in the data packet from each channel; The receiving time of the first bit of each channel is sent to the delay compensator; the delay calculator is used to calculate the delay deviation of each channel, and the delay deviation of each channel is sent to the delay compensator; The delay compensator is configured to adjust, according to the delay deviation of each channel, a receiving time of receiving the first bit in the data packet on each channel; the message reassembler is used according to the The receiving time of the first bit in the adjusted data message is used to reassemble the received message. Through the solution provided by the embodiment, the delay measurement accuracy of each channel of the next-generation EPON system can reach the bit level, so that the receiving device can accurately reassemble the message regardless of the circumstances, thereby greatly improving the system. reliability.

In a possible design, the FEC processor is specifically configured to: when the receiving device detects that the number of the FEC codeword received on each channel is the same, the received bit of the FEC codeword received by each channel is received. The time delay is sent to the delay calculator; the delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record.

In a possible design, the FEC processor is specifically configured to record a receiving time of a specific bit of the FEC codeword received by each channel; when it is detected that the number of the FEC codeword received on each channel is the same, the The received time of the record is sent to the delay calculator;

The delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record.

In a possible design, the FEC processor is specifically configured to record a receiving time of a specific bit of the FEC codeword received by each channel; when detecting that the synchronization header Sync Header of the FEC codeword received by each channel is a specific value, Transmitting the received time of the record to the delay calculator; wherein the Sync Header is a sync header Sync Header in the Parity Block of the FEC codeword; the delay calculator is specifically used for Based on the received time of the record, the delay deviation of each channel is calculated.

In a possible design, the delay compensator is specifically configured to compensate for the arrival time of the first bit of the data packet on each channel according to the delay deviation of each channel, and obtain the The receiving time of the first bit of the data message after compensation on each channel is described.

On the other hand, an embodiment of the present application provides an optical network unit, where the optical network unit includes any one of the receiving devices provided in the above related possibilities.

On the other hand, the embodiment of the present application provides an optical line terminal, which includes any one of the receiving devices provided in the above related possibilities.

In one aspect, the embodiment of the present application provides a passive optical network system, where the passive optical network system includes: a sending device and a receiving device, where the sending device sends data through at least two channels, and the receiving device passes at least The two channels receive data; the sending device is used for the forward error correction code code word FEC codeword sent in each channel; the receiving device is any one of the receiving devices mentioned above. Through the solution provided by the embodiment, the delay measurement accuracy of each channel of the next-generation EPON system can reach the bit level, so that the receiving device can accurately reassemble the message regardless of the circumstances, thereby greatly improving the system. reliability.

In a possible design, the sending device is specifically configured to align the FEC codeword to be sent on each channel, and send the aligned FEC codeword.

In a possible design, the sending device is specifically configured to set a value of a sync header Sync Header of a parity block Parity block in the FEC codeword to be sent to a specific value, and send the Sync Header to a FEC codeword of a specific value.

On the other hand, the embodiment of the present application provides a passive optical network system, where the passive optical network system includes: an optical line terminal, a wavelength division multiplexer/demultiplexer, a beam splitter, and at least one optical network. a unit, the optical line terminal and the optical network unit are connected by the optical splitter, and the optical line terminal and any one of the optical network units have at least two channels, and the optical network unit includes any of the above mentioned A receiving device. Through the solution provided by the embodiment, the delay measurement accuracy of each channel of the next-generation EPON system can reach the bit level, so that the receiving device can accurately reassemble the message regardless of the circumstances, thereby greatly improving the system. reliability.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments and the prior art description will be briefly described below. Obviously, the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those of ordinary skill in the art based on these drawings without any inventive labor.

1 is a schematic diagram of a network architecture of a PON system provided by the prior art;

2 is a schematic diagram of a network architecture of a next-generation EPON system according to an embodiment of the present invention;

FIG. 3 is a data communication method according to an embodiment of the present invention;

4A is a frame structure diagram of an FEC codeword according to an embodiment of the present invention;

4B is a schematic diagram of sending an FEC codeword according to an embodiment of the present invention;

4C is a schematic diagram of delay deviation of a channel according to an embodiment of the present invention;

4D is a sequence diagram of receiving a first bit in a data packet according to an embodiment of the present invention;

4E is a timing diagram of receiving a first bit in a data packet according to an embodiment of the present invention;

4F is a schematic diagram of a packet reassembly according to a first bit arrival time of a modified packet according to an embodiment of the present disclosure;

4G is a schematic diagram of a recombined FEC codeword according to an embodiment of the present invention;

4H is a schematic diagram of a packet distribution manner sent by a sending device according to an embodiment of the present disclosure;

4I is a schematic diagram of a reassembly packet of a receiving device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a receiving device according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a network of another PON system according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another receiving device according to an embodiment of the present invention.

detailed description

The embodiment of the present invention provides a data communication method, a related device, and a system, which are used to solve the problem of out-of-order data packets received by the receiving device due to the delay of the wavelength channel in the next-generation EPON system, and realize the next generation. The delay measurement accuracy of each channel of the EPON system can reach the bit level, so that the receiving device can accurately reassemble the message regardless of the circumstances, which greatly improves the reliability of the system.

In order to make the object, the features and the advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

2 is a schematic diagram of a network architecture of a next-generation EPON system. As shown in FIG. 2, the next-generation EPON system 100 includes an OLT 110, a plurality of ONUs 120, and an Optical Distribution Network (ODN) 130.

The following describes the network structure of Figure 2 below. The OLT 110 includes a message distributor and respective downlink ports. The illustration is given by the message distributor as a demultiplexer DeMultiplexing, which is given as four downlink ports in the example of the downlink port diagram, here given as an example, at least two downlink ports are provided. An electrical signal is generated between the DeMultiplexing and the port, and the DeMultiplexing and the downlink port are both disposed on a board of the OLT, and each of the downlink ports can convert an electrical signal into an optical signal and output through the port. The four downlink ports of the OLT and the multiplexer WDM are connected by a branch fiber, and optical signals are transmitted in each branch fiber. The wavelengths of the optical signals transmitted in the branched fibers may be the same or different. It should be noted that if the WDM is set in the OLT, the downlink ports of the OLT and the WDM are connected by a waveguide. The WDM and the beam splitter 130 are connected by a trunk fiber, and the beam splitter 130 is connected to the WDM of the terminal side through a branch fiber. The WDM is connected to the message reassembler through the uplink ports of the terminal-side device ONU, and the message reassembler is a multiplexer or a multiplexer in the example of FIG. 2, including but not limited to the multiplexer or the multiplexer. Waves. The WDM on the terminal side and the uplink ports on the ONU 120 transmit optical signals through the branch fibers. When the WDM of the terminal is set on the ONU 120, the WDM and the ONU 120 are connected by a waveguide for transmitting an optical signal. Each uplink port on the ONU 120 converts the optical signal into The electrical signal is transmitted to the Multiplxing for message reassembly, and an electrical signal is transmitted between the respective uplink ports and the Multiplxing. Finally, the ONU sends the reassembled service flow to the user through each downlink port (not shown in FIG. 2).

The network structure diagram of FIG. 2 is described in the following manner: the OLT receives a service flow from the network side, and distributes the service flow through at least two channels through each downlink port, and FIG. 2 gives For example, four channels are respectively transmitted for λ0-λ4, wherein the one service stream is split into data packets of variable lengths and transmitted through respective channels. The WDM aggregates the data packets of the respective channels, and transmits them to the WDM of each terminal side through the optical splitter 130, and demultiplexes them to the respective channels λ0-λ4 of the respective ONUs 120 by the WDM on the terminal side, and performs datagrams through the respective channels. The transmission of the text finally reorganizes the message through Multiplexing, and sends the reassembled data packet, that is, the service flow, to the user.

The above channel can be understood as a wavelength channel, or it can be another channel. The channel can be a logical channel or a physical layer fiber link. In the above network architecture diagram, the channel can be understood as a logical or physical link from each downlink port of the OLT to each uplink port of the ONU.

In addition, the network architecture of the above-mentioned next-generation EPON is an example of a 100GEPON architecture, that is, data transmission is performed between the OLT and the ONU through four channels, each channel carrying 25 Gbps data packets, and a total of 100 Gbps data packets can be transmitted. It should be noted that if the OLT and the ONU transmit data through two channels, each channel carries 25 Gbps data packets, and a total of 50 Gbps data packets can be transmitted. The architecture of the above example can also be a 50 G EPON architecture. There are no restrictions here.

The data packet transmitted between the OLT and the ONU may be Ethernet data or a forward error correction code code word FEC codeword, and the Ethernet data is encapsulated and transmitted in the payload data block of the FEC codeword.

Based on the network architecture provided in FIG. 2 above, a data communication method is provided, as shown in FIG. The receiving device is applied to the receiving device in the optical network system. The receiving device may be the receiving device included in the OLT in FIG. 2 or the receiving device on the ONU side. The receiving device receives data through at least two channels, and the method includes:

S300. The receiving device receives, from each channel, a forward error correction code sent by the sending device. Code word FEC codeword.

S302. The receiving device obtains a delay deviation of each channel.

Optionally, the receiving device obtains the delay deviation of each channel in the following manners:

The first type is that the receiving device can perform the number statistics on the FEC codeword. When the receiving device detects that the number of the FEC codeword received on each channel is the same, the receiving time of the specific bit of the FEC codeword received by each channel is recorded; The delay deviation of each channel is calculated based on the reception time of the recorded specific bit.

The specific method for calculating the delay deviation of each channel by the receiving device is as follows:

The receiving device uses the receiving time of the specific bit of the receiving FEC codeword on any one of the wavelength channels as a reference value, and calculates the receiving time and the specific bit of the same number of FEC codeword received on the other wavelength channel. The difference between the reference values, which is the delay deviation of other wavelength channels.

The specific methods for calculating the delay deviation of each channel by the receiving device in the following manners are the same, and will not be described here.

The second type is that the receiving device records the receiving time of the specific bit of the FEC codeword received by each channel; when the receiving device detects that the number of the FEC codeword received on each channel is the same, according to the specificity of the record The bit delay time is calculated, and the delay deviation of each channel is calculated.

The third type is that when the receiving device detects that the synchronization header Sync Header of the FEC codeword received by each channel is a specific value, the receiving time of the specific bit of the FEC codeword is received according to the recorded channel, and the calculation is performed. The delay deviation of each channel; wherein the Sync Header is a sync header Sync Header in the parity block Parity Block in the FEC codeword.

The delay deviation of the above calculation channel can be buffered in a certain period, and the delay deviation of each wavelength channel of the buffer can be used in the set period, and the delay deviation of each wavelength channel is refreshed again according to the above manner in the next cycle. .

In addition, it should be noted that the specific bit of the FEC codeword may be any bit of the FEC codeword, for example, the first bit of the FEC codeword, or the last bit, and the like. The frame structure diagram of the FEC codeword can be seen in Figure 4, specifically This is the frame structure of the FEC codeword defined in the prior art, for example, the standard of IEEE802.3. The 66-bit code block generated by the coding as shown in the figure is a data code block or a control code block, and includes an idle code block corresponding to the frame interval (including invalid data), and uniformly performs FEC coding by using 27 code blocks as one packet. According to 27 code blocks, 4 Parity code blocks are obtained. The common data code block and the control code block use 01 and 10 as synchronization heads respectively, and the 4 Parity code blocks adopt 00, 11, and 11, respectively. 00 as a sync header. Please refer to the relevant chapters of the standard for the description of Figure 4 here, and will not repeat them.

Specifically, the above various manners are specifically described below.

Step 1: The sending device aligns the FEC codewords of the four channels and sends them. As shown in Figure 4B.

The sending device controls the FEC codeword of the four channels so that the timing of each channel is aligned, thereby ensuring that the FEC codeword is aligned and transmitted.

Step 2: The receiving device detects the receiving time of the specific bit of the FECcodeword of each channel, and can calculate the delay deviation of the remaining channels relative to the reference channel by using a specified channel as the reference channel, and the delay deviation can be positive or negative, and the delay is generated. table.

The specific delay deviation is combined with Figure 4C and Table 1.

Table 1 shows the delay deviation table for each channel:

Table 1

Lane channel Delay difference #1 / #2 △t2 #3 △t3 #4 △t4

The specific derivation formula is: te1=ts1+d1; te2=ts2+d2; te3=ts3+d3; te4=ts4+d4; ts1 is the sending device sending FEC codeword on channel 1 after the sending device's aligned FEC codeword is sent. The sending time, ts2 is the sending time of the sending device to send the FEC codeword on channel 2, and so on. Obviously, the sending time of ts1-ts4 is equal, therefore, Δt2=te2-te1=d2-d1, and so on. Generating a delay time table of the above wavelength channel and each channel, the table records each The delay skew of the wavelength channel.

S304. The receiving device parses the data packet from the FEC codeword, and obtains a receiving time of receiving the first bit in the data packet from each channel.

The structure of the FEC codeword is as shown in FIG. 4, and the data block of the payload block is obtained as a data packet, and the receiving time of receiving the first bit in the data packet on each channel is recorded.

S306. The receiving device adjusts, according to the delay deviation of each channel, a receiving time of receiving the first bit in the data packet on each channel.

The receiving device compensates for the arrival time of the first bit of the data packet on each channel according to the delay deviation of each channel, and obtains the data packet after compensation on each channel. The reception time of the first bit.

For details of the above steps S304 and S306, please refer to the following detailed description:

Table 2 below is a comparison table of receiving the reception time of the first bit in the data message and the reception time of the corrected first bit from the respective channels.

Table 2

Specifically, a timing diagram of receiving the first bit in the data packet from each channel is shown in FIG. 4D and FIG. 4E.

Where t1_x' = t1_x, t2_x' = t2_x + Δt2, t3_x' = t3_x + Δt3, t4_x' = t4_x + Δt4.

S308. The receiving device reassembles the received packet according to the receiving time of the first bit in the adjusted data packet.

Receiving, according to the receiving time of the first bit in the adjusted data packet, the receiving device After the order, the received message is reorganized.

The receiving device reassembles the packet according to the time when the first packet of the corrected packet reaches the time, as shown in FIG. 4F.

The specific relationship of the above several tables can be uniformly described by the following table:

Table 3 is a table of generated channel delay differences:

table 3

Lane Delay difference #1 / #2 △t2 #3 △t3 #4 △t4

Table 4 shows the receiving time of the first bit in the data packet received by the receiving device:

Table 4

Table 5 shows the time of the first bit of the received data packet according to Table 3 and Table 4. Table 5 shows the first bit reception time of the modified corrected packet for each wavelength channel:

table 5

The time delay of Table 4 is used to correct the time of Table 3, and the time of Table 5 obtained by the modification is used for message reorganization.

The receiving device calculates the delay of each channel according to the receiving time of the specific bit of the FEC codeword of each channel, and records the receiving time of the first bit in the data packet of the FEC codeword of each channel, and the first bit of each channel packet. The receiving time is corrected, and the packet reassembly is performed according to the corrected first bit receiving time of each channel packet, that is, the packet is scheduled from each channel queue according to the first bit arrival time of each channel packet, and the first bit arrival time is more Early, the first to get the schedule.

The receiving device can calculate the delay deviation of each channel for each FEC codeword, or calculate the delay deviation of each channel according to a certain period. For example, the delay deviation update of each channel is performed once every N FEC codewords.

Further, when the receiving device calculates the delay deviation of each channel according to a certain period, the periodic calculation can be implemented by setting a counter. For example, a counter is set for each channel, and each FEC codeword is incremented by one, when the counter reaches N. Reset the counter and trigger the Delay Calculator to calculate the delay deviation of each channel. You can also set a timer for each channel. The initial value is N. Each time an FEC codeword is received, the timer is reset. When the timer is 0, the timer is reset. At the same time, the receiving device is triggered to calculate the delay deviation of each channel.

Further, when the receiving device calculates the delay deviation of each channel according to a certain period, the synchronization header Sync Header of the parity block Parity block of the partial FEC codeword may also be flipped in a certain period, when the Sync Header of the inverted Parity Block is detected. After that, the receiving device is triggered to calculate the delay deviation of each channel.

Taking FEC of 10G EPON as an example, each FEC codeword is composed of 27 payload blocks and 4 Parity blocks, and the Sync Headers of 4 Parity blocks are 00, 11, respectively. 11, 00, the Sync Header of the Parity block of the FEC codeword is flipped, that is, the Sync Headers of the four Parity blocks are 11, 00, 00, and 11, respectively.

Optionally, in order to improve reliability, the Sync Header of the Parity block of consecutive multiple FEC code words may be flipped in a certain period.

The setting specific value of the Sync Header of the Parity block of the specific FEC code word can be as shown in FIG. 4G.

In addition, the packet distribution manner sent by the sending device can be as shown in FIG. 4H.

The receiving device reassembly message can be as shown in FIG. 4I.

Through the data communication method provided in this embodiment, the delay measurement accuracy of each channel of the next-generation EPON system can reach the bit level, so that the receiving device can accurately reassemble the message regardless of the circumstances, and greatly improve The reliability of the system.

The embodiment of the invention further provides a receiving device. As shown in FIG. 5, the receiving device includes:

The receiving port unit Port receives the forward error correction code code word FEC codeword sent by the sending device by using a channel corresponding to the interface unit, and sends the received FEC codeword to the FEC processor.

The receiving port unit Port may be at least two receiving port units such as port-1 and port-2.

The FEC processor FEC-X is configured to parse the received FEC codeword and send the parsed data packet to a timer.

The FEC-X may be FEC-1, FEC-2 or the like.

The timer Timer-x is configured to record a receiving time of receiving the first bit in the data packet from each channel, and send a receiving time of the first bit of each channel to a delay compensator.

The Timer-x may be Timer-1, Timer-2, or the like.

The delay calculator Delay Caculator is used to calculate the delay deviation of each channel, and send the delay deviation of each channel to the delay compensator.

The delay compensator is configured to adjust a receiving time of receiving the first bit in the data packet on each channel according to the delay deviation of each channel.

The packet reassembler Pcket Combiner is configured to reassemble the received packet according to the receiving time of the first bit in the adjusted data packet.

Further, the FEC processor is specifically configured to: when the receiving device detects that the number of the FEC codeword received on each channel is the same, the received time of the specific bit of the FEC codeword received by each channel is recorded; The received time of the record is sent to the delay calculator.

The delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record.

Optionally, the FEC processor is specifically configured to record a receiving time of a specific bit of the FEC codeword received by each channel; and when it is detected that the number of the FEC codeword received on each channel is the same, the receiving of the record is performed. The time is sent to the delay calculator.

The delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record.

Optionally, the FEC processor is specifically configured to record a receiving time of a specific bit of the FEC codeword received by each channel; when detecting that the synchronization header Sync Header of the FEC codeword received by each channel is a specific value, The receiving time of the record is sent to the delay calculator; wherein the Sync Header is a sync header Sync Header in the parity block Parity Block in the FEC codeword;

The delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record.

Further, the delay compensator is specifically configured to compensate for the arrival time of the first bit of the data packet on each channel according to the delay deviation of each channel, to obtain the channels The received time of the first bit of the compensated data message.

The buffer buffer can also be included in the foregoing Figure 5 for buffering the foregoing data packet.

For details, refer to the detailed description of the embodiment shown in FIG. 3 above, and details are not described herein again.

In addition, as shown in the optical network unit in the system of FIG. 2, the optical network unit includes: any one of the receiving devices as described above; or an optical line terminal in the system of FIG. 2, the line terminal includes: Any of the receiving devices described.

With the receiving device provided in this embodiment, the delay measurement accuracy of each channel of the next-generation EPON system can reach the bit level, so that the receiving device can implement the packet in any case. Indeed, reorganization has greatly improved the reliability of the system.

The embodiment of the present invention further provides a passive optical network system. As shown in FIG. 6, the system includes: a sending device and a receiving device, where the sending device sends data through at least two channels, and the receiving device passes at least The two channels receive data; the sending device is used for the forward error correction code code word FEC codeword sent in each channel; the receiving device may be any one of the receiving devices described in the foregoing embodiments.

Further, the sending device is specifically configured to align the FEC codeword to be sent on each channel, and send the aligned FEC codeword.

Further, the sending device is specifically configured to set a value of a synchronization header Sync Header of the parity block Parity block in the FEC codeword to be sent to a specific value, and send the Sync Header to a FEC codeword of a specific value.

The function performed by each unit of the transmitting device can be referred to the receiving device, which is the reverse process of the receiving device.

As shown in FIG. 2, an embodiment of the present invention further provides a passive optical network system, where the passive optical network system includes: an optical line terminal, a wavelength division multiplexer/demultiplexer, a beam splitter, and at least one light. a network unit, the optical line terminal and the optical network unit are connected by the optical splitter, and the optical line terminal and any one of the optical network units have at least two channels, and the optical network unit includes the foregoing embodiment description. Any one of the receiving devices.

An embodiment of the present invention further provides a receiving device. As shown in FIG. 7, the receiving device includes: a processor, a memory, and a bus system, where the processor and the memory are connected by the bus system, and the memory For storing instructions, the processor is configured to execute the instructions stored by the memory,

The processor is configured to: receive, from each channel, a forward error correction code code word FEC codeword sent by the sending device; obtain a delay deviation of each channel; and parse the data packet from the FEC codeword, Obtaining a receiving time of receiving the first bit in the data packet from each channel; adjusting a receiving time of receiving the first bit in the data packet on each channel according to the delay deviation of each channel And reassembling the received message according to the receiving time of the first bit in the adjusted data packet.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the above units is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated. Go to another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The above-described integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, server or network device, etc., and in particular a processor in a computer device) to perform all or part of the steps of the above-described methods of various embodiments of the present invention. The foregoing storage medium may include: a U disk, a mobile hard disk, a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), and the like. The media of the sequence code.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims (18)

A data communication method is applied to a receiving device in a passive optical network system, where the receiving device receives data through at least two channels, wherein the method includes: Receiving, by the receiving device, the forward error correction code code word FEC codeword sent by the sending device from each channel; The receiving device obtains a delay deviation of each channel; The receiving device parses the data packet from the FEC codeword, and obtains a receiving time of receiving the first bit in the data packet from each channel; Receiving, by the receiving device, the receiving time of receiving the first bit in the data packet on each channel according to the delay deviation of each channel; The receiving device reassembles the received packet according to the receiving time of the first bit in the adjusted data packet. The data communication method according to claim 1, wherein the obtaining the delay deviation of each channel by the receiving device comprises: When the receiving device detects that the number of the FEC codeword received on each channel is the same, the receiving time of the specific bit of the FEC codeword received by each channel is recorded; The delay deviation of each channel is calculated based on the reception time of the recorded specific bit. The data communication method according to claim 1, wherein the method further comprises: The receiving device records the reception time of a specific bit of the FEC codeword received by each channel. The data communication method according to claim 3, wherein the receiving device obtains the delay deviation of each channel specifically includes: When the receiving device detects that the numbers of the FEC codewords received on the respective channels are the same, the delay deviation of each channel is calculated according to the receiving time of the recorded specific bits. The data communication method according to claim 3, wherein the receiving device obtains the delay deviation of each channel specifically includes: When the receiving device detects that the synchronization header SyncHeader of the FEC codeword received by each channel is a specific value, the delay time of each channel is calculated according to the receiving time of the specific bit of the FEC codeword received by each channel of the record. Deviation; wherein the Sync Header is a sync header Sync Header in the parity block Parity Block in the FEC codeword. The data communication method according to claim 1, wherein said receiving device And adjusting, according to the delay deviation of each channel, the receiving time of receiving the first bit in the data packet on each channel, specifically: The receiving device compensates for the arrival time of the first bit of the data packet on each channel according to the delay deviation of each channel, and obtains the data packet after compensation on each channel. The reception time of the first bit. A receiving device, wherein the receiving device comprises: The receiving port unit receives the forward error correction code code word FEC codeword sent by the sending device by using a channel corresponding to the interface unit, and sends the received FEC codeword to the FEC processor; The FEC processor is configured to parse the received FEC codeword, and send the parsed data packet to a timer; The timer is configured to record a receiving time of receiving the first bit in the data packet from each channel, and send a receiving time of the first bit of each channel to a delay compensator; The delay calculator is configured to calculate a delay deviation of each channel, and send the delay deviation of each channel to the delay compensator; The delay compensator is configured to adjust, according to the delay deviation of each channel, a receiving time of receiving the first bit in the data packet on each channel; The message reassembler is configured to reassemble the received message according to the receiving time of the first bit in the adjusted data message. The receiving device according to claim 7, wherein the FEC processor is specifically configured to: when the receiving device detects that the number of the FEC codeword received on each channel is the same, the recorded channels receive a receiving time of a specific bit of the FEC codeword; sending the received time of the record to the delay calculator; The delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record. The receiving device according to claim 7, wherein the FEC processor is specifically configured to record a receiving time of a specific bit of the FEC codeword received by each channel; when detecting that the FEC codeword is received on each channel If the numbers are the same, the receiving time of the record is sent to the delay calculator; The delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record. The receiving device according to claim 7, wherein the FEC processor is specifically configured to record a receiving time of a specific bit of the FEC codeword received by each channel; and when detecting the synchronization of the FEC codeword received by each channel The Sync Header is a specific value, and the received time of the record is sent to the delay calculator; wherein the Sync Header is a sync header Sync Header in the parity block Parity Block in the FEC codeword; The delay calculator is specifically configured to calculate a delay deviation of each channel according to the received time of the record. The receiving device according to claim 6, wherein the delay compensator is specifically configured to: arrive at a first bit of the data packet on each channel according to a delay deviation of each channel The time is compensated to obtain the reception time of the first bit of the data message after compensation on each channel. An optical network unit, characterized in that the optical network unit comprises: any one of the receiving devices according to claims 6-11. An optical line terminal, characterized in that the optical line terminal comprises: any one of the receiving devices according to claims 6-11. A passive optical network system, characterized in that the passive optical network system comprises: a transmitting device and a receiving device, wherein the transmitting device transmits data through at least two channels, and the receiving device receives data through at least two channels. The transmitting device is configured to transmit a forward error correction code code word FEC codeword in each channel; the receiving device is any one of the receiving devices according to claims 6-11. The passive optical network system according to claim 14, wherein the transmitting device is specifically configured to align the FEC codeword to be sent on each channel, and send the aligned FEC codeword. The passive optical network system according to claim 14, wherein the sending device is configured to set a value of a synchronization header Sync Header of a parity block Parity block to be a specific value, and send the location The Sync Header is a FEC codeword of a specific value. A passive optical network system, comprising: an optical line terminal, a wavelength division multiplexer/demultiplexer, a beam splitter, and at least one optical network unit, the optical line terminal and the light The network unit is connected by the optical splitter, and the optical line terminal and any one of the optical network units have at least two channels, wherein the optical network unit comprises the following claims 6-11 Any one of the receiving devices. A receiving device, comprising: a processor, a memory, and a bus system, wherein the processor and the memory are connected by the bus system, wherein the memory is used to store an instruction, and the processor uses Executing instructions stored in the memory, The processor is configured to: receive, from each channel, a forward error correction code code word FEC codeword sent by the sending device; obtain a delay deviation of each channel; and parse the data packet from the FEC codeword, Obtaining a receiving time of receiving the first bit in the data packet from each channel; adjusting a receiving time of receiving the first bit in the data packet on each channel according to the delay deviation of each channel And reassembling the received message according to the receiving time of the first bit in the adjusted data packet.

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