CN106685591B - Data transmission method and equipment - Google Patents
Data transmission method and equipment Download PDFInfo
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- CN106685591B CN106685591B CN201611130586.9A CN201611130586A CN106685591B CN 106685591 B CN106685591 B CN 106685591B CN 201611130586 A CN201611130586 A CN 201611130586A CN 106685591 B CN106685591 B CN 106685591B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
Abstract
A data transmission method and device, the method includes: receiving an uplink scheduling grant sent by an optical line terminal OLT, wherein the uplink scheduling grant comprises at least two grant channels and the grant starting time and the grant time length of each grant channel in the at least two grant channels; according to transmission data and authorization starting time and authorization time length of each authorization channel, constructing at least two data frames corresponding to the at least two authorization channels one by one, wherein each data frame of the at least two data frames comprises at least one code word, each data frame carries a sequence number, the sequence number carried by each data frame is used for indicating the position of a first code word in the code words included in each data frame in transmission data, and when each data frame comprises two or more code words, the code words included in each data frame are continuous in the transmission data; and respectively sending the at least two data frames to the OLT through the corresponding authorization channels. The embodiment of the invention can improve the data transmission efficiency.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method and device.
Background
With the continuous development of broadband access technology, the scale of Passive Optical Network (PON) is becoming larger. However, as the demand of users for data streams increases, the bandwidth in the existing PON cannot meet the demand of users. In order to solve the above problems, a channel binding method is proposed in the industry, that is, data is transmitted through a plurality of channels simultaneously. At present, a commonly used data transmission method is: the transmission data is mapped on different channels in units of Forward Error Correction (FEC) codewords. However, in this method, in order to ensure that an Optical Line Terminal (OLT) can correctly identify the relative positions of FEC codewords transmitted in different channels in a data stream, an FEC codeword sequence number needs to be added to the head of each FEC codeword, so that the number of bits used by the FEC codewords for transmitting data is reduced, thereby reducing the data transmission efficiency.
Disclosure of Invention
The embodiment of the invention discloses a data transmission method and equipment, which are used for improving the data transmission efficiency.
A first aspect discloses a data transmission method, which is applied to an Optical Network Unit (ONU), and receives an uplink scheduling grant including at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels, which are sent by an OLT, constructs at least two data frames corresponding to the at least two grant channels one to one according to transmission data and the grant start time and the grant time length of each of the at least two grant channels, and sends the at least two data frames to the OLT through the corresponding grant channels. Each data frame of the at least two data frames comprises at least one code word, each data frame carries a serial number, the serial number carried by each data frame is used for indicating the position of a first code word in the code words included in each data frame in transmission data, and when each data frame comprises two or more code words, the code words included in each data frame are continuous in the transmission data, so that the OLT can realize the recombination of the at least two data frames through the serial number of the first code word carried by each data frame, and each data frame only needs to carry the serial number of one code word in the transmission data, so that the number of the serial numbers carried in the data frames is reduced, more data can be transmitted in the data frames, and the data transmission efficiency is improved. The transmission data, that is, the data that the ONU needs to transmit to the OLT.
In one embodiment, the first code word in each data frame may include a first code block and a second code block, the first code block is used for synchronization of a self-scrambling code, the second code block is used for delimitation and synchronization of a coordination sub-layer (RS), a sequence number carried by each data frame may be carried in the second code block in each data frame, the sequence number of the first code word may be carried by the second code block without changing the data frame, no extra bit in the data frame may be used to carry the sequence number, and data transmission efficiency may be improved.
In an embodiment, the first code word in each data frame may include a first code block, the first code block is used for synchronization of a self-scrambling code, the sequence number carried by each data frame may be carried in the first code block in each data frame, and the sequence number of the first code word may be carried by using the first code block.
In an embodiment, each data frame carries a sequence number, which may carry padding bits in each data frame, and since the padding bits in the data frame may carry the sequence number of the first codeword, the first code block and the second code block in the data frame may be deleted, so that data may be transmitted at the positions of the first code block and the second code block, which may shorten the length of the data frame, thereby improving the data transmission efficiency and further improving the data transmission rate.
In an embodiment, each data frame may further carry a Logical Link Identifier (LLID) and a number of code words of at least one code word included in the data frame, where the LLID is used to identify an ONU, so that the OLT may determine, according to the LLID carried in the data frame, that the data frame is sent by the ONU, and may implement reassembly of the data frame faster according to the number of code words of at least one code word included in the data frame carried in the data frame.
In one embodiment, the codeword included in each data frame may be an FEC codeword, and may also be another codeword or another code block.
A second aspect discloses a data transmission method, which is applied to an OLT, and receives at least two data frames sent by an ONU through at least two grant channels, where each of the at least two data frames includes at least one codeword, each data frame carries a sequence number, and the sequence number is used to indicate a position of a first codeword in the codewords included in each data frame in transmission data, obtain a sequence number carried by each data frame, and recombine the at least two data frames according to the obtained sequence numbers to obtain the transmission data, when the number of the data frames is 2 and the sequence number carried by the first data frame is smaller than the sequence number carried by the second data frame, a first codeword in the transmission data is a first codeword in the first data frame, and when the sequence number carried by the second data frame is a next sequence number adjacent to the sequence number carried by the first data frame, and when the sequence number carried by the second data frame is not the next sequence number adjacent to the sequence number carried by the first data frame, the second code word in the transmission data is the second code word in the first data frame. Because each data frame only carries the sequence number of the first code word in the at least one code word in the transmission data, the number of the sequence numbers carried in the data frame is reduced, so that more data can be transmitted in the data frame, and the data transmission efficiency is improved. The transmission data is data that the OLT can receive from the ONUs.
In one embodiment, the first code word in each data frame may include a first code block and a second code block, the first code block is used for synchronization of a self-scrambling code, the second code block is used for delimitation and synchronization of an RS, a sequence number carried by each data frame may be carried in the second code block in each data frame, the sequence number of the first code word may be carried by the second code block without changing the data frame, no extra bit in the data frame may be used to carry the sequence number, and data transmission efficiency may be improved.
In an embodiment, the first code word in each data frame may include a first code block, the first code block is used for synchronization of a self-scrambling code, the sequence number carried by each data frame may be carried in the first code block in each data frame, and the sequence number of the first code word may be carried by using the first code block.
In an embodiment, the sequence number carried by each data frame may be carried in padding bits in each data frame, and since the padding bits in the data frame may carry the sequence number of the first code word, the first code block and the second code block in the data frame may be deleted, so that data may be transmitted at the positions of the first code block and the second code block, the length of the data frame may be shortened, and thus, the data transmission rate may be further increased while the data transmission efficiency is increased.
In an embodiment, each data frame may further carry an LLID and a code number of at least one code included, the LLID is used to identify the ONU, and the at least two data frames are recombined according to the obtained serial number to obtain the transmission data, or the at least two data frames are recombined according to the obtained serial number, the LLID, and the code number to obtain the transmission data transmitted by the ONU. The OLT may determine which data frames are sent by that ONU according to the LLIDs carried in the data frames, and implement reassembly of the data frames faster according to the number of codewords of at least one codeword included in the data frames carried in the data frames.
In one embodiment, the codeword included in each data frame may be an FEC codeword, and may be another codeword or another code block.
A third aspect discloses an ONU comprising means for performing the data transmission method of the first aspect or any one of its possible implementations.
A fourth aspect discloses an ONU comprising a processor for storing program code, a memory for executing the program code, and a transceiver for communicating with an OLT. The program code stored in the memory, when executed by the processor, causes the processor to perform the data transfer method disclosed in the first aspect or any one of the possible implementations of the first aspect.
A fifth aspect discloses a readable storage medium storing program code for an ONU to perform the data transmission method disclosed by the first aspect or any one of the possible implementations of the first aspect.
A sixth aspect discloses an OLT comprising means for performing the data transmission method provided by the second aspect or any one of the possible implementations of the second aspect.
A seventh aspect discloses an OLT comprising a processor for storing program code, a memory for executing the program code, and a transceiver for communicating with the OLT. The program code stored in the memory, when executed by the processor, causes the processor to perform the data transfer method disclosed in the second aspect or any of its possible implementations.
An eighth aspect discloses a readable storage medium storing program code for an OLT to perform the data transmission method disclosed by the second aspect or any one of the possible implementations of the second aspect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a network architecture according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an uplink burst data frame structure in an EPON system according to an embodiment of the present invention
Fig. 3 is a schematic flow chart of a data transmission method disclosed in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an ONU disclosed in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of another ONU disclosed in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of an OLT according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another OLT according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of an authorized channel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an extended second code block according to an embodiment of the disclosure;
FIG. 10 is a schematic diagram of another data frame disclosed in embodiments of the invention;
fig. 11 is a schematic diagram of a modified first code block disclosed in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a data transmission method and equipment, which are used for improving the data transmission efficiency. The following are detailed below.
In order to better understand a data transmission method and device disclosed in the embodiments of the present invention, a network architecture used in the embodiments of the present invention is described below. Referring to fig. 1, fig. 1 is a schematic diagram of a network architecture according to an embodiment of the present invention. As shown in fig. 1, the network architecture may include an OLT101 and at least two ONUs 102. The OLT101 and at least two ONUs 102 may communicate with each other through optical fiber channels, where the wavelengths of light that can be transmitted on optical fibers in each optical fiber channel are different, and one ONU102 may transmit data to the OLT101 through multiple optical fiber channels at the same time. The signal from OLT101 to ONU102 is a downstream signal, and the signal from ONU102 to OLT101 is an upstream signal. In the PON system, uplink and downlink signals may both adopt wavelength division multiplexing, but uplink and downlink multiplexing modes may be different. For example, the downlink signal is in a continuous mode, and the data stream is not interrupted; while the upstream signal is in burst mode, OLT101 can only receive data sent by one ONU102 for a certain period of time. Referring to fig. 2, fig. 2 is a schematic diagram of an uplink burst data frame structure in an Ethernet passive optical network (Ethernet PON, EPON) system according to an embodiment of the present invention. As shown in fig. 2, the data frame may include a synchronization code (SyncPattern), a Burst Delimiter (BD), an FEC codeword, and an End Of Burst (EOB) in sequence. The synchronization code is used for realizing data and clock synchronization of the OLT to the ONU, the BD is used for identifying the start position of the burst packet, the FEC code word is used for transmitting data, and the EOB is used for identifying the end of the burst packet. The data structure shown in fig. 2 includes N FEC code words, where a first FEC code word arranged after the BD includes a first code block and a second code block, the first code block is used for synchronization of the self-scrambling code, and the second code block is used for delimiting and synchronizing the RS. The first code block and the second code block are both 66-bit code blocks. Wherein the code block has a length smaller than the code word, and one code word may include at least one code block.
Referring to fig. 3, fig. 3 is a schematic flow chart of a data transmission method according to an embodiment of the present invention based on the network architecture shown in fig. 1. Wherein the data transmission method is described from the perspective of the OLT101 and the ONUs 102. As shown in fig. 3, the data transmission method may include the following steps.
301. And when transmission data needing to be transmitted to the OLT exist, the ONU sends a bandwidth request carrying the required bandwidth to the OLT.
In this embodiment, when there is transmission data that needs to be transmitted to the OLT in the ONU, the ONU determines a bandwidth required for transmitting the transmission data according to the capacity of the transmission data, and sends a bandwidth request carrying the required bandwidth to the OLT. The bandwidth request may be sent to the OLT through any channel between the ONU and the OLT in a report (report) message manner, or may be sent to the OLT through any channel between the ONU and the OLT in another manner.
302. The OLT sends an uplink scheduling grant including at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels to the ONU.
In this embodiment, after receiving a bandwidth request carrying a required bandwidth and sent by an ONU, an OLT determines, according to an occupation situation of each channel between the ONU and the OLT, the bandwidth of each channel, and the required bandwidth, at least two grant channels granted by the ONU and an grant start time and a grant time length of each of the at least two grant channels, and sends an uplink scheduling grant including the grant start time and the grant time length of each of the at least two grant channels and each of the at least two grant channels to the ONU. When the bandwidth of each channel is the same, the number of channels required to be authorized for the ONU is determined according to the bandwidth of each channel and the required bandwidth, then the authorized channel authorized for the ONU is determined according to the number of channels and the occupation condition of each channel, the authorization start time and the authorization time length of the authorized channel are determined, and the channel which is idle first can be authorized to the ONU. Referring to fig. 8, fig. 8 is a schematic diagram of an authorized channel according to an embodiment of the disclosure. As shown in fig. 8, in order to increase the upstream transmission bandwidth by channel bonding, there should be an overlapping portion between the grant channels so that the upstream transmission bandwidth reaches a maximum value at the portion where the grant channels overlap.
For example, when the bandwidth of each channel is 25G and the required bandwidth is 100G, it may be determined that 4 authorized channels are required according to 100G and 25G, and then the first idle authorized channel with 4 channels as an OUN is selected from the channels between the OLT and the ONU. When the bandwidth of each channel is different and the required bandwidth is 100G, the first idle channel in the channels between the OLT and the ONU is channel 1, the bandwidth of channel 1 is 50G, the second idle channel is channel 2, the bandwidth of channel 2 is 25G, the third idle channel is channel 3, and the bandwidth of channel 3 is 25G, so that channel 1, channel 2, and channel 3 can be authorized to the ONU.
303. And the ONU constructs at least two data frames which are in one-to-one correspondence with the at least two authorization channels according to the transmission data and the authorization starting time and the authorization time length of each authorization channel.
In this embodiment, after receiving an uplink scheduling grant, which includes at least two grant channels and a grant start time and a grant time length of each grant channel in the at least two grant channels, sent by an OLT, an ONU constructs a data frame for each grant channel according to transmission data and the grant start time and the grant time length of each grant channel to obtain at least two data frames, where each data frame in the at least two data frames includes at least one codeword, each data frame carries a sequence number, and the sequence number is used to indicate a position of a first codeword in the codewords included in each data frame in transmission data, and when each data frame carries two or more codewords, the codewords included in each data frame are consecutive in the transmission data, that is, the codewords included in the at least two data frames are consecutive in the transmission frame, for example: when the number of the data frames is 2, the sequence numbers of the code words included in the first data frame in the transmission data are sequentially 1, 3 and 5, and the sequence numbers of the code words included in the second data frame in the transmission data are sequentially 2, 4, 6 and 7, although the sequence numbers of the code words included in each data frame in the transmission data may be discontinuous, the sequence numbers of all the code words included in the first data frame and the second data frame in the transmission data frame are 1 to 7 and are continuous. The code words included in at least two data frames may be FEC code words, or may be other code words or other code blocks, such as 66b code blocks or 64b code blocks. In addition, at least two data frames must include codewords of the same length.
In this embodiment, when the number of the grant channels is 2, a first codeword in a first data frame corresponding to a first grant channel may be a first codeword in transmission data, when the length of the codeword is greater than a length that can carry data between the grant start time of the first grant channel and the grant start time of a second grant channel, a first codeword in a second data frame corresponding to a second grant channel is a second codeword in the transmission data, and when the length of the codeword is less than or equal to a length that can carry data between the grant start time of the first grant channel and the grant start time of the second grant channel, a second codeword in the first data frame is a second codeword in the transmission data. And the authorization starting time of the first authorization channel is earlier than that of the second authorization channel.
In this embodiment, based on the data frame structure shown in fig. 2, a sequence number carried by each data frame and used for indicating a position of a first codeword in transmission data in a codeword included in each data frame may be carried in the second code block, and in addition, the second code block may also carry an LLID and a number of codewords of at least one codeword included in each data frame, where the LLID is used to identify an ONU, that is, to identify that the data frame is generated or sent by that ONU. Referring to fig. 9, fig. 9 is a schematic diagram of an extended second code block according to an embodiment of the disclosure. As shown in fig. 9, bytes 0 and 7 carry start and end characters, respectively, bytes 1 and 2 are used to carry LLID, bytes 3 and 4 are used to carry the number of FEC codewords, and bytes 5 and 6 are used to carry the sequence number of the first FEC codeword in the data frame.
In this embodiment, based on the data frame structure shown in fig. 2, a sequence number carried by each data frame and used for indicating a position of a first codeword in transmission data in a codeword included in each data frame may be carried in the first code block, because the first code block and the second code block respectively perform synchronization of a self-scrambling code and synchronization of an RS, and the second code block is meaningless in practical application, the second code block in the data frame may be deleted, and according to a self-scrambling code polynomial of an existing standard, only 58 bits are needed to complete scrambling code synchronization, and the remaining 8 bits are also redundant, so that 8 bits in the first code block may be used to carry the sequence number of the first codeword in the data frame. Referring to fig. 10, fig. 10 is a schematic diagram of another data frame according to an embodiment of the disclosure. As shown in fig. 10, the modified data frame only includes the first code block and does not include the second code block, 1 indicates the sequence number of the first code word in the data frame corresponding to the first grant channel in the transmission data, 3 indicates the sequence number of the first code word in the data frame corresponding to the second grant channel in the transmission data, and 4 indicates the sequence number of the first code word in the data frame corresponding to the first grant channel in the transmission data. Referring to fig. 11, fig. 11 is a schematic diagram of a modified first code block according to an embodiment of the disclosure. As shown in fig. 11, the modified first code block carries a sequence number SN of a first codeword in transmission data in at least one codeword included in each data frame. It can be seen that, since the first codeword only needs to include the first code block and does not need to include the second code block, the number of bits of data carried by the first codeword can be increased, and thus the data transmission rate can be increased. In addition, the first code block may also carry the LLID and the number of codewords of at least one codeword included in each data frame,
in this embodiment, the first code block and the second code block are implementation manners of an existing 10G EPON standard, and in implementation manners of subsequent standards, if there are other manners capable of replacing functions of the first code block and the second code block, the two code blocks may be omitted. The FEC code type adopted by the current standard is RS (255, 223), and the line coding mode of 66b64b adopted in 10G EPON is that an integer number of 66b code blocks enter the FEC encoder every time, and the first two bits of each 66b code block are synchronization headers, and only two values of 01 and 10 are provided, so that only 1 bit needs to be protected, and 65 bits all enter the FEC encoder for each 66b code block. When each FEC code word is encoded, 27 65-bit code blocks still do not reach the payload required by the code word, and 29-bit 0 s need to be filled in front of each code word, and then 223 bytes can be made for FEC encoding. After the FEC coding is completed, the padded 0 with 29 bits is not sent out through the physical layer, but is directly deleted, and the receiving end needs to firstly pad 0 with 29 bits when decoding, so that the complete FEC code word is decoded. Thus, the sequence number carried by each data frame to indicate the position in the transmission data of the first one of the codewords comprised by each data frame may carry a padding bit in each data frame. For example, when the codeword included in each data frame is an FEC codeword, a part of the 29-bit padding bits may be taken out as a first FEC codeword sequence number, the ONU places the sequence number of the first FEC codeword in the 29-bit padding bits in a padding (padding) manner, and after FEC encoding is completed, the 29-bit padding bits are deleted and then sent to the OLT through the physical layer. When the OLT decodes, the 0 with 29 bits is filled for decoding, and because the filling bit has the serial number of the first code when the ONU sends data, the decoder detects that the filling bit has an error code pattern and corrects the error code pattern. As long as it is within the error correction range of the FEC code pattern, the OLT may recover the first codeword sequence number of the ONU, and may use the sequence number for the reassembly of the binding traffic. The ONU may carry, in the padding bit, besides the sequence number of the first codeword, information such as an LLID, the number of codewords of at least one codeword included in each data frame, and the like. Since the first code block and the second code block in the first codeword are deleted, the number of bits of data carried by the first codeword is increased, and thus the data transmission rate can be improved.
304. And the ONU sends the at least two data frames to the OLT through the corresponding authorization channels respectively.
305. The OLT acquires the serial number carried in each data frame and recombines at least two data frames according to the acquired serial numbers to obtain transmission data.
In this embodiment, after receiving at least two data frames sent by the ONU, the OLT acquires a serial number carried by each data frame, and then reassembles the at least two data frames according to the acquired serial numbers to obtain transmission data. When the number of the data frames is 2 and the sequence number carried by the first data frame is smaller than the sequence number carried by the second data frame, a first code word in the transmission data is the first code word in the first data frame, when the sequence number carried by the second data frame is the next sequence number adjacent to the sequence number carried by the first data frame, a second code word in the transmission data is the first code word in the second data frame, and when the sequence number carried by the second data frame is not the next sequence number adjacent to the sequence number carried by the first data frame, the second code word in the transmission data is the second code word in the first data frame.
In this embodiment, when each data frame further carries the LLID and the number of code words including at least one code word, at least two data frames may be recombined according to the obtained serial number, the LLID, and the number of code words, so as to obtain transmission data transmitted by the ONU. Wherein the sequence numbers of at least one codeword in each data frame are not necessarily consecutive, for example: the transmission data comprises 8 code words in total, the first data frame comprises 1 and 6 code words, the second data frame comprises 2 and 5 code words, the third data frame comprises 3 and 8 code words, and the fourth data frame comprises 4 and 7 code words.
In the data transmission method described in fig. 3, the ONU receives an uplink scheduling grant, which includes at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels and is sent by the OLT, and according to the transmission data and the grant start time and the grant time length of each of the at least two grant channels, at least two data frames corresponding to the at least two grant channels one to one are sent to the OLT through the corresponding grant channels, respectively. Each data frame of the at least two data frames comprises at least one code word, each data frame carries a serial number, the serial number carried by each data frame is used for indicating the position of a first code word in the code words included in each data frame in transmission data, and when each data frame comprises two or more code words, the code words included in each data frame are continuous in the transmission data, so that the OLT can realize the recombination of the at least two data frames through the serial number of the first code word carried by each data frame, and each data frame only needs to carry the serial number of one code word in the transmission data, so that the number of the serial numbers carried in the data frames is reduced, more data can be transmitted in the data frames, and the data transmission efficiency is improved. The transmission data, that is, the data that the ONU needs to transmit to the OLT.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an ONU according to an embodiment of the present invention, based on the network architecture shown in fig. 1. As shown in fig. 4, the ONU may include:
a receiving unit 401, configured to receive an uplink scheduling grant sent by an OLT, where the uplink scheduling grant includes at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels;
a constructing unit 402, configured to construct at least two data frames corresponding to at least two grant channels one to one according to the grant start time and the grant time length of each grant channel included in the uplink scheduling grant received by the data transmission and reception unit 401, where each data frame of the at least two data frames includes at least one codeword, each data frame carries a sequence number, the sequence number carried by each data frame is used to indicate a position of a first codeword in the codewords included in each data frame in transmission data, and when each data frame includes two or more codewords, the codewords included in each data frame are consecutive in the transmission data;
a sending unit 403, configured to send the at least two data frames constructed by the constructing unit 402 to the OLT through corresponding authorization channels, respectively.
As a possible implementation, the first code word in each data frame includes a first code block and a second code block, the first code block is used for synchronization of the self-scrambling code, and the second code block is used for delimitation and synchronization of the RS;
each data frame carrying a sequence number includes:
the second code block in each data frame carries a sequence number.
As a possible implementation, the first code word in each data frame includes a first code block, and the first code block is used for synchronization of the self-scrambling code;
each data frame carrying a sequence number includes:
the first code block in each data frame carries a sequence number.
As a possible implementation, each data frame carrying a sequence number includes:
the padding bits in each data frame carry a sequence number.
As a possible implementation, each data frame further carries an LLID and a number of code words including at least one code word, and the LLID is used to identify the ONU.
As a possible implementation, the codeword included in each data frame may be an FEC codeword.
In the ONU described in fig. 4, the ONU receives an uplink scheduling grant including at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels, which are sent by the OLT, and according to transmission data and the grant start time and the grant time length of each of the at least two grant channels, at least two data frames corresponding to the at least two grant channels one to one, and sends the at least two data frames to the OLT through the corresponding grant channels, respectively. Each data frame of the at least two data frames comprises at least one code word, each data frame carries a serial number, the serial number carried by each data frame is used for indicating the position of a first code word in the code words included in each data frame in transmission data, and when each data frame comprises two or more code words, the code words included in each data frame are continuous in the transmission data, so that the OLT can realize the recombination of the at least two data frames through the serial number of the first code word carried by each data frame, and each data frame only needs to carry the serial number of one code word in the transmission data, so that the number of the serial numbers carried in the data frames is reduced, more data can be transmitted in the data frames, and the data transmission efficiency is improved. The transmission data, that is, the data that the ONU needs to transmit to the OLT.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another ONU disclosed in the embodiment of the present invention based on the network architecture shown in fig. 1. As shown in fig. 5, the ONU may include: a processor 501, a memory 502, a transceiver 503, and a bus 504. Wherein:
a bus 504 for enabling connections between these components;
a transceiver 503, configured to receive an uplink scheduling grant sent by the OLT, where the uplink scheduling grant may include at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels;
the memory 502 has a set of program codes stored therein, and the processor 501 is configured to call the program codes stored in the memory 502 to perform the following operations:
according to transmission data and authorization starting time and authorization time length of each authorization channel, constructing at least two data frames corresponding to the at least two authorization channels one by one, wherein each data frame of the at least two data frames comprises at least one code word, each data frame carries a sequence number, the sequence number carried by each data frame is used for indicating the position of a first code word in the code words included in each data frame in transmission data, and when each data frame comprises two or more code words, the code words included in each data frame are continuous in the transmission data;
the transceiver 503 is further configured to send at least two data frames to the OLT through corresponding grant channels.
As a possible implementation, the first code word in each data frame includes a first code block and a second code block, the first code block is used for synchronization of the self-scrambling code, and the second code block is used for delimitation and synchronization of the RS;
each data frame carrying a sequence number includes:
the second code block in each data frame carries a sequence number.
As a possible implementation, the first code word in each data frame includes a first code block, and the first code block is used for synchronization of the self-scrambling code;
each data frame carrying a sequence number includes:
the first code block in each data frame carries a sequence number.
As a possible implementation, each data frame carrying a sequence number includes:
the padding bits in each data frame carry a sequence number.
As a possible implementation, each data frame further carries an LLID and a number of code words including at least one code word, and the LLID is used to identify the ONU.
As a possible implementation, the codeword included in each data frame may be an FEC codeword.
In the ONU described in fig. 5, the ONU receives an uplink scheduling grant, which is sent by the OLT and includes at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels, and according to transmission data and the grant start time and the grant time length of each of the at least two grant channels, at least two data frames corresponding to the at least two grant channels one to one, and sends the at least two data frames to the OLT through the corresponding grant channels, respectively. Each data frame of the at least two data frames comprises at least one code word, each data frame carries a serial number, the serial number carried by each data frame is used for indicating the position of a first code word in the code words included in each data frame in transmission data, and when each data frame comprises two or more code words, the code words included in each data frame are continuous in the transmission data, so that the OLT can realize the recombination of the at least two data frames through the serial number of the first code word carried by each data frame, and each data frame only needs to carry the serial number of one code word in the transmission data, so that the number of the serial numbers carried in the data frames is reduced, more data can be transmitted in the data frames, and the data transmission efficiency is improved. The transmission data, that is, the data that the ONU needs to transmit to the OLT.
Referring to fig. 6, based on the network architecture shown in fig. 1, fig. 6 is a schematic structural diagram of an OLT according to an embodiment of the present invention. As shown in fig. 6, the OLT may include:
a receiving unit 601, configured to receive at least two data frames sent by an ONU through at least two grant channels, where each data frame in the at least two data frames includes at least one codeword, and each data frame carries a sequence number, where the sequence number is used to indicate a position of a first codeword in codewords included in each data frame in transmission data;
an obtaining unit 602, configured to obtain a sequence number carried in each data frame received by the receiving unit 601;
a reassembling unit 603, configured to reassemble at least two data frames received by the receiving unit 601 according to the sequence number acquired by the acquiring unit 602 to obtain transmission data, where when the number of the data frames is 2 and the sequence number carried by the first data frame is smaller than the sequence number carried by the second data frame, a first codeword in the transmission data is a first codeword in the first data frame, when the sequence number carried by the second data frame is a next sequence number adjacent to the sequence number carried by the first data frame, a second codeword in the transmission data is a first codeword in the second data frame, and when the sequence number carried by the second data frame is not a next sequence number adjacent to the sequence number carried by the first data frame, a second codeword in the transmission data is a second codeword in the first data frame.
As a possible implementation, the first code word in each data frame includes a first code block and a second code block, the first code block is used for synchronization of the self-scrambling code, and the second code block is used for delimitation and synchronization of the RS;
each data frame carrying a sequence number includes:
the second code block in each data frame carries a sequence number.
As a possible implementation, the first code word in each data frame includes a first code block, and the first code block is used for synchronization of the self-scrambling code;
each data frame carrying a sequence number includes:
the first code block in each data frame carries a sequence number.
As a possible implementation, each data frame carrying a sequence number includes:
the padding bits in each data frame carry a sequence number.
As a possible implementation manner, each data frame further carries an LLID and a code number of at least one code word included in the LLID, where the LLID is used to identify an ONU;
the reassembly unit 603 is specifically configured to reassemble the at least two data frames according to the obtained serial number, LLID, and number of code words, so as to obtain transmission data transmitted by the ONU.
As a possible implementation, the codeword included in each data frame may be an FEC codeword.
In the OLT depicted in fig. 6, the OLT receives at least two data frames sent by the ONU through at least two grant channels, each of the at least two data frames includes at least one code word, each data frame carries a sequence number, the sequence number is used to indicate a position of a first code word in the code words included in each data frame in transmission data, obtain a sequence number carried by each data frame, and recombine the at least two data frames according to the obtained sequence number to obtain transmission data, when the number of the data frames is 2 and the sequence number carried by the first data frame is smaller than the sequence number carried by the second data frame, a first code word in the transmission data is the first code word in the first data frame, and when the sequence number carried by the second data frame is a next sequence number adjacent to the sequence number carried by the first data frame, a second code word in the transmission data is the first code word in the second data frame, when the sequence number carried by the second data frame is not the next sequence number adjacent to the sequence number carried by the first data frame, the second codeword in the transmission data is the second codeword in the first data frame. Because each data frame only carries the sequence number of the first code word in the at least one code word in the transmission data, the number of the sequence numbers carried in the data frame is reduced, so that more data can be transmitted in the data frame, and the data transmission efficiency is improved. Wherein the transmission data OLT is capable of transmitting data received from the ONUs.
Referring to fig. 7, based on the network architecture shown in fig. 1, fig. 7 is a schematic structural diagram of another OLT according to an embodiment of the present invention. As shown in fig. 7, the OLT may include: a processor 701, a memory 702, a transceiver 703 and a bus 704. Wherein:
a bus 704 for enabling connection between these components;
a transceiver 703, configured to receive at least two data frames sent by an ONU through at least two grant channels, where each data frame in the at least two data frames includes at least one codeword, and each data frame carries a sequence number, where the sequence number is used to indicate a position of a first codeword in transmission data in the codewords included in each data frame;
the memory 702 has a set of program codes stored therein, and the processor 701 is configured to call the program codes stored in the memory 702 to perform the following operations:
acquiring a sequence number carried in each data frame;
and recombining at least two data frames according to the obtained serial numbers to obtain transmission data, wherein when the number of the data frames is 2 and the serial number carried by the first data frame is smaller than the serial number carried by the second data frame, a first code word in the transmission data is a first code word in the first data frame, when the serial number carried by the second data frame is a next serial number adjacent to the serial number carried by the first data frame, a second code word in the transmission data is a first code word in the second data frame, and when the serial number carried by the second data frame is not a next serial number adjacent to the serial number carried by the first data frame, a second code word in the transmission data is a second code word in the first data frame.
As a possible implementation, the first code word in each data frame includes a first code block and a second code block, the first code block is used for synchronization of the self-scrambling code, and the second code block is used for delimitation and synchronization of the RS;
each data frame carrying a sequence number includes:
the second code block in each data frame carries a sequence number.
As a possible implementation, the first code word in each data frame includes a first code block, and the first code block is used for synchronization of the self-scrambling code;
each data frame carrying a sequence number includes:
the first code block in each data frame carries a sequence number.
As a possible implementation, each data frame carrying a sequence number includes:
the padding bits in each data frame carry a sequence number.
As a possible implementation manner, each data frame further carries an LLID and a code number of at least one code word included in the LLID, where the LLID is used to identify an ONU;
the processor 701 performs reassembly on at least two data frames according to the obtained sequence numbers to obtain transmission data, including:
and recombining at least two data frames according to the obtained serial number, the LLID and the number of the code words to obtain the transmission data transmitted by the ONU.
As a possible implementation, the codeword included in each data frame may be an FEC codeword.
In the OLT depicted in fig. 7, the OLT receives at least two data frames sent by the ONU through at least two grant channels, each of the at least two data frames includes at least one code word, each data frame carries a sequence number, the sequence number is used to indicate a position of a first code word in the code words included in each data frame in transmission data, obtain a sequence number carried by each data frame, and recombine the at least two data frames according to the obtained sequence number to obtain transmission data, when the number of the data frames is 2 and the sequence number carried by the first data frame is smaller than the sequence number carried by the second data frame, a first code word in the transmission data is the first code word in the first data frame, and when the sequence number carried by the second data frame is a next sequence number adjacent to the sequence number carried by the first data frame, a second code word in the transmission data is the first code word in the second data frame, when the sequence number carried by the second data frame is not the next sequence number adjacent to the sequence number carried by the first data frame, the second codeword in the transmission data is the second codeword in the first data frame. Because each data frame only carries the sequence number of the first code word in the at least one code word in the transmission data, the number of the sequence numbers carried in the data frame is reduced, so that more data can be transmitted in the data frame, and the data transmission efficiency is improved. Wherein the transmission data OLT is capable of transmitting data received from the ONUs.
The embodiment of the invention also discloses a readable storage medium, which stores the program code used by the ONU or the OLT to execute the data transmission method shown in the figure 3.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: flash disks, read-only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The data transmission method and the data transmission device disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (24)
1. A data transmission method is applied to an Optical Network Unit (ONU), and comprises the following steps:
receiving an uplink scheduling grant sent by an Optical Line Terminal (OLT), wherein the uplink scheduling grant comprises at least two grant channels and a grant starting time and a grant time length of each grant channel in the at least two grant channels;
constructing at least two data frames corresponding to the at least two authorization channels one to one according to transmission data and authorization start time and authorization time length of each authorization channel, wherein each data frame of the at least two data frames comprises at least one code word, each data frame carries a sequence number, the sequence number is used for indicating the position of a first code word in the code words included in each data frame in the transmission data, and when each data frame comprises two or more code words, the code words included in each data frame are continuous in the transmission data;
and respectively sending the at least two data frames to the OLT through corresponding authorization channels.
2. The method of claim 1, wherein a first codeword in each data frame comprises a first code block and a second code block, wherein the first code block is used for synchronization of self-scrambling codes, and wherein the second code block is used for coordinating delimitation and synchronization of sub-layer RSs;
each data frame carrying a sequence number comprises:
the second code block in each data frame carries a sequence number.
3. The method of claim 1, wherein a first codeword in each data frame comprises a first code block, and wherein the first code block is used for synchronization of a self-scrambling code;
each data frame carrying a sequence number comprises:
the first code block in each data frame carries a sequence number.
4. The method of claim 1, wherein the each data frame carrying a sequence number comprises:
and the padding bit in each data frame carries a sequence number.
5. The method according to any of claims 1-4, wherein each data frame further carries a logical link identification LLID and a number of codewords of the at least one codeword included, the LLID being used to identify the ONU.
6. The method according to any of claims 1-4, wherein each data frame comprises a codeword that is a forward error correction, FEC, codeword.
7. A data transmission method is applied to an Optical Line Terminal (OLT), and comprises the following steps:
receiving at least two data frames sent by an optical network unit ONU through at least two authorized channels, wherein each data frame of the at least two data frames comprises at least one code word, each data frame carries a sequence number, and the sequence number is used for indicating the position of a first code word in the code words included in each data frame in transmission data;
acquiring a sequence number carried in each data frame;
the at least two data frames are recombined according to the obtained serial numbers to obtain the transmission data, when the number of the data frames is 2 and the serial number carried by the first data frame is smaller than the serial number carried by the second data frame, a first code word in the transmission data is a first code word in the first data frame, when the serial number carried by the second data frame is a next serial number adjacent to the serial number carried by the first data frame, a second code word in the transmission data is a first code word in the second data frame, and when the serial number carried by the second data frame is not a next serial number adjacent to the serial number carried by the first data frame, a second code word in the transmission data is a second code word in the first data frame.
8. The method of claim 7, wherein a first codeword in each data frame comprises a first code block and a second code block, wherein the first code block is used for synchronization of self-scrambling codes, and wherein the second code block is used for coordinating delimitation and synchronization of sub-layer RSs;
each data frame carrying a sequence number comprises:
the second code block in each data frame carries a sequence number.
9. The method of claim 7, wherein a first codeword in each data frame comprises a first code block, and wherein the first code block is used for synchronization of a self-scrambling code;
each data frame carrying a sequence number comprises:
the first code block in each data frame carries a sequence number.
10. The method of claim 7, wherein the each data frame carrying a sequence number comprises:
and the padding bit in each data frame carries a sequence number.
11. The method according to any of claims 7-10, wherein each data frame further carries a logical link identification LLID for identifying the ONU and a number of codewords of the at least one codeword included;
the recombining the at least two data frames according to the obtained sequence numbers to obtain the transmission data includes:
and recombining the at least two data frames according to the obtained serial number, the LLID and the number of the code words to obtain the transmission data transmitted by the ONU.
12. The method according to any of claims 7-10, wherein said codeword included in each data frame is a forward error correction, FEC, codeword.
13. An optical network unit, ONU, comprising:
a receiving unit, configured to receive an uplink scheduling grant sent by an optical line terminal OLT, where the uplink scheduling grant includes at least two grant channels and a grant start time and a grant time length of each of the at least two grant channels;
a constructing unit, configured to construct at least two data frames corresponding to the at least two grant channels one to one according to grant start time and grant time length of each grant channel included in the uplink scheduling grant received by the receiving unit, where each data frame of the at least two data frames includes at least one codeword, each data frame carries a sequence number, the sequence number is used to indicate a position of a first codeword in the codewords included in each data frame in the transmission data, and when each data frame includes two or more codewords, the codewords included in each data frame are consecutive in the transmission data;
and the sending unit is used for sending the at least two data frames constructed by the construction unit to the OLT through corresponding authorization channels.
14. The ONU of claim 13, wherein the first codeword in each data frame comprises a first code block and a second code block, wherein the first code block is used for synchronization of self-scrambling codes, and wherein the second code block is used for coordinating delimitation and synchronization of sublayer RSs;
each data frame carrying a sequence number comprises:
the second code block in each data frame carries a sequence number.
15. The ONU of claim 13, wherein the first codeword in each data frame comprises a first code block, and wherein the first code block is used for synchronization of a self-scrambling code;
each data frame carrying a sequence number comprises:
the first code block in each data frame carries a sequence number.
16. The ONU of claim 13, wherein the each data frame carrying a sequence number comprises:
and the padding bit in each data frame carries a sequence number.
17. The ONU according to any of claims 13-16, wherein each data frame further carries a logical link identification LLID for identifying the ONU and the number of code words of the at least one code word included.
18. The ONU according to any of claims 13-16, wherein each data frame comprises codewords that are forward error correction, FEC, codewords.
19. An optical line termination, OLT, comprising:
a receiving unit, configured to receive at least two data frames sent by an optical network unit ONU through at least two grant channels, where each data frame in the at least two data frames includes at least one codeword, and each data frame carries a sequence number, where the sequence number is used to indicate a position of a first codeword in codewords included in each data frame in transmission data;
an obtaining unit, configured to obtain a sequence number carried in each data frame received by the receiving unit;
a reassembly unit configured to reassemble the at least two data frames received by the receiving unit according to the sequence number acquired by the acquiring unit to obtain the transmission data, when the number of data frames is 2, and the sequence number carried by the first data frame is less than the sequence number carried by the second data frame, the first codeword in the transmission data is the first codeword in the first data frame, when the sequence number carried by the second data frame is the next sequence number adjacent to the sequence number carried by the first data frame, the second codeword in the transmission data is the first codeword in the second data frame, when the sequence number carried by the second data frame is not the next sequence number adjacent to the sequence number carried by the first data frame, the second codeword in the transmission data is the second codeword in the first data frame.
20. The OLT of claim 19, wherein a first code word in each data frame comprises a first code block and a second code block, wherein the first code block is used for synchronization of self-scrambling codes, and wherein the second code block is used for coordinating delimitation and synchronization of sublayer RSs;
each data frame carrying a sequence number comprises:
the second code block in each data frame carries a sequence number.
21. The OLT of claim 19, wherein a first code word in each data frame comprises a first code block, the first code block being used for synchronization of a self-scrambling code;
each data frame carrying a sequence number comprises:
the first code block in each data frame carries a sequence number.
22. The OLT of claim 19, wherein each data frame carrying a sequence number comprises:
and the padding bit in each data frame carries a sequence number.
23. The OLT of any of claims 19-22, wherein each data frame further carries a logical link identification LLID and a number of codewords of the at least one codeword included, the LLID identifying the ONU;
the reassembly unit is specifically configured to reassemble the at least two data frames according to the obtained serial number, the LLID, and the number of codewords, so as to obtain the transmission data transmitted by the ONU.
24. The OLT of any of claims 19-22, wherein each data frame comprises a codeword that is a Forward Error Correction (FEC) codeword.
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| CN108650561B (en) * | 2018-04-13 | 2020-10-09 | 烽火通信科技股份有限公司 | System and method for managing code in 100G EPON |
| EP3782307A4 (en) * | 2018-09-24 | 2021-06-23 | Huawei Technologies Co., Ltd. | Multiple-rate optical network unit (onu) activation |
| CN112866308B (en) * | 2019-11-12 | 2023-03-10 | 华为技术有限公司 | Data reorganization method and device |
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