WO2017113349A1 - Procédé et appareil d'analyse syntaxique de données et de transmission de données - Google Patents

Procédé et appareil d'analyse syntaxique de données et de transmission de données Download PDF

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Publication number
WO2017113349A1
WO2017113349A1 PCT/CN2015/100244 CN2015100244W WO2017113349A1 WO 2017113349 A1 WO2017113349 A1 WO 2017113349A1 CN 2015100244 W CN2015100244 W CN 2015100244W WO 2017113349 A1 WO2017113349 A1 WO 2017113349A1
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Prior art keywords
fec
fec codeword
codeword
onu
data frame
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PCT/CN2015/100244
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English (en)
Chinese (zh)
Inventor
景磊
高波
赵殿博
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华为技术有限公司
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Priority to PCT/CN2015/100244 priority Critical patent/WO2017113349A1/fr
Publication of WO2017113349A1 publication Critical patent/WO2017113349A1/fr

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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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H04J3/0605—Special codes used as synchronising signal
    • H04J3/0608—Detectors therefor, e.g. correlators, state machines
    • 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

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data parsing and data transmission method and apparatus.
  • the PON Passive Optical Network
  • the PON network is generally composed of an OLT (Optical Line Termination), a POS (Passive Optical Splitter), and an ONU (Optical Network Unit).
  • OLT Optical Line Termination
  • POS Passive Optical Splitter
  • ONU Optical Network Unit
  • the downlink data of the OLT to the ONU in the PON is broadcast to all ONUs in the working state in the form of frames. Each ONU parses all data after accepting the frame message and discards the data requested by other ONUs.
  • XGPON 10G-GPON, 10 Gigabit Passive Optical Network
  • XGPON's downlink data frame XGTC XGPON transmission convergence, 10 Gigabit Passive Optical Network Transmission Convergence
  • FEC Forward Error Correction, Forward
  • the error correction code block is required to be divided into a plurality of FEC code blocks, and the FEC coded information code block and the check bits of each FEC code block together constitute an FEC code word.
  • a certain number of FEC codewords are combined into a payload to scramble the payload.
  • the scrambled payload plus the fields used for synchronization together constitute a PHY (Physical Layer) frame of the XGPON downlink.
  • PHY Physical Layer
  • the data is first synchronized according to the synchronization field, then the payload portion is descrambled, and the starting position of the FEC is delimited to correctly parse the FEC encoding.
  • the optical components of the XGPON system will age, making the link power budget tight, the bit error rate rising, and even failing to work properly.
  • the synchronization difficulty will increase under high error codes, affecting customer satisfaction.
  • Embodiments of the present invention provide a data parsing method, including: an optical network unit ONU from an optical line
  • the terminal OLT receives a downlink data frame, where the downlink data frame includes a first forward error correction FEC code protected first FEC codeword, and a second FEC code protected second FEC codeword, the second FEC codeword
  • the error correction capability of the second FEC code used is stronger than the first FEC code used by the first FEC codeword, and the first FEC codeword includes the second FEC codeword start position information and the first Two FEC codeword end position information
  • the ONU parses the start position information and the end position information of the second FEC codeword from the first FEC codeword
  • the ONU parses the start location information and the location
  • the second FEC codeword determined by the end location information is obtained to obtain user data.
  • the embodiment of the present invention further provides a data transmission method, including: an optical line terminal OLT generates a downlink data frame, where the downlink data frame includes a first forward error correction FEC code protected first FEC codeword, and a second FEC Encoding a protected second FEC codeword, the second FEC code used by the second FEC codec has a stronger error correction capability than the first FEC codeword used by the first FEC codeword, the first FEC code
  • the word includes the second FEC codeword start position information and the second FEC codeword end position information; the OLT sends the downlink data frame to the optical network unit ONU.
  • An embodiment of the present invention further provides an optical network unit ONU, including: a receiving unit, configured to receive a downlink data frame from an optical line terminal OLT, where the downlink data frame includes a first forward error correction FEC code protection first FEC a codeword, and a second FEC code-protected second FEC codeword, wherein the second FEC code uses a second FEC coded error correction capability that is stronger than the first FEC codeword uses the first FEC code And the first FEC codeword includes the second FEC codeword start location information and the second FEC codeword end location information.
  • a parsing unit configured to parse starting position information and ending position information of the second FEC codeword from the first FEC codeword, and parse a second FEC determined according to the starting location information and the ending location information Codewords to get user data.
  • An embodiment of the present invention further provides an optical line terminal OLT, including: a data generating unit, configured to generate a downlink data frame, where the downlink data frame includes a first forward error correction FEC code protected first FEC codeword, and a second FEC code protected second FEC codeword, the second FEC code used by the second FEC code has a stronger error correction capability than the first FEC codeword used by the first FEC codeword,
  • the first FEC codeword includes the second FEC codeword start location information and the second FEC codeword end location information
  • the sending unit is configured to send the downlink data frame to the optical network unit ONU.
  • the data frame exchanged between the OLT and the ONU includes the first FEC coded first FEC codeword and the second FEC coded second FEC codeword, in the first FEC code.
  • the start position information and the end position information of the second FEC codeword are saved in the word. Since the error correction capability of the second FEC code is stronger than the first FEC code, the technical solution of the embodiment of the present invention can reduce the bit error rate, thereby improving synchronization. effectiveness.
  • different users in the same PON can select the FEC coding mode according to the link quality, which can be compatible with users with different needs and improve user satisfaction.
  • FIG. 1 is a schematic diagram of an embodiment of a PON.
  • FIG. 2 is a schematic structural diagram of a downlink data frame according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a downlink data frame according to another embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a part of a downlink data frame according to an embodiment of the present invention.
  • Figure 5 is a schematic illustration of an embodiment of a synchronous state machine.
  • FIG. 6 is a schematic structural diagram of a downlink data frame according to another embodiment of the present invention.
  • FIG. 7 is a flowchart of a data parsing method according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of an ONU according to an embodiment of the present invention.
  • FIG. 9 is a structural diagram of an OLT according to an embodiment of the present invention.
  • the PON 100 can be a point-to-multipoint network, including an Optical Line Terminal (OLT) 110, a plurality of Optical Network Units (ONUs) 120, and an Optical Distribution Network (ODN). 130, wherein the ODN 130 can be coupled to the OLT 110 and the plurality of ONUs 120.
  • OLT 110 may be located at a Central Office (CO)
  • CO Central Office
  • the plurality of ONUs 120 may be located at a plurality of customer premises
  • the ODN 130 is disposed between the OLT 110 and the ONU 120.
  • the PON 100 may be a communication network that does not require any active devices to implement data distribution between the OLT 110 and the ONU 120. Instead, the PON 100 can distribute data between the OLT 110 and the ONU 120 using passive optical devices in the ODN 130.
  • the PON 100 may be a GPON system, downlink data may be broadcast at a rate of approximately 2.5 Gigabits per second (Gbps), and uplink data may be transmitted at a rate of approximately 1.25 Gbps.
  • the PON 100 can be an NGA system that can be configured to transmit data frames with greater reliability and efficiency and through greater bandwidth.
  • the PON 100 can be a 10 Gbps GPON (also known as XGPON) with a downstream bandwidth of approximately 10 Gbps and an upstream bandwidth of at least approximately 2.5 Gbps.
  • other examples that may be applied to the PON 100 include: an asynchronous transmission mode passive optical network defined by the ITU-T G.983 standard.
  • the OLT 110 may be any component for transferring data between the plurality of ONUs 120 and another network (not shown).
  • the OLT 110 can act as a medium between the plurality of ONUs 120 and the other network described above.
  • the OLT 110 can forward data received from the other network to the plurality of ONUs 120 and forward data received from the plurality of ONUs 120 to the other network.
  • the specific configuration of the OLT 110 may vary depending on the particular type of PON 100, in one embodiment, the OLT 110 may include a transmitter and a receiver.
  • the OLT 110 If the network protocol used by the other network is different from the PON protocol used by the PON 100, for example, the other network uses an Ethernet protocol or a Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) protocol, the OLT 110.
  • a converter may be further included for converting the above network protocol into a PON protocol.
  • the converter of the OLT 110 can also convert the PON protocol into the above network protocol.
  • the OLT 110 is typically located at a central location, such as a central office, but may be located at other locations as well.
  • the plurality of ONUs 120 can be any device for communicating with the OLT 110 and a customer or user (not shown).
  • the plurality of ONUs 120 can act as a medium between the OLT 110 and the user.
  • the plurality of ONUs 120 can forward data received from the OLT 110 to the user and forward data received from the user to the OLT 110.
  • the ONUs 120 may include a light for transmitting optical signals to the OLT 110.
  • the ONU 120 may further comprise a converter for converting an optical signal into an electrical signal for a user, such as a signal based on an Ethernet protocol or an ATM protocol; and another transmitter and/or receiver for the The user transmits and/or receives an electrical signal from the user.
  • the ONU 120 is similar to an Optical Network Terminal (ONT), and thus, the ONU and the ONT are interchangeable in this document.
  • the plurality of ONUs may be located in a distributed location, such as a customer premises, but may be located elsewhere.
  • the ODN 130 can be a data distribution system that can include fiber optic cables, couplers, splitters, distributors, and/or other devices.
  • the fiber optic cable, coupler, splitter, distributor, and/or other device may be a passive optical device.
  • the fiber optic cable, coupler, splitter, distributor, and/or other device may be a device that does not require a power source when distributing data signals between the OLT 110 and the plurality of ONUs 120.
  • the ODN 130 may also include one or more processing devices, such as optical amplifiers.
  • the ODN 130 may specifically extend from the OLT 110 to the ONU 120, but may also be configured in other point-to-multipoint configurations.
  • the OLT 110 and the ONU 120 may perform data exchange, and the data may be encapsulated in a frame or message, such as an Ethernet frame.
  • the frame may include a payload and a frame header, wherein the frame header may include synchronization and configuration information.
  • a Transmission Convergence (TC) frame can be used to transmit a downlink message based on the GPON Transmission Aggregation (GTC) protocol layer.
  • GTC GPON Transmission Aggregation
  • Information such as from the OLT 110 to the ONU 120.
  • the transport convergence layer is defined in the ITU-T G.984.3 standard, the contents of which are incorporated herein by reference.
  • the TC may also include a Physical Synchronization (Psync) field, which may indicate the beginning of the TC frame.
  • Psync Physical Synchronization
  • the Psync field may include a fixed code, which may have a fixed code value of "0xB6AB31E0" (hexadecimal format) to indicate the beginning of the frame.
  • the field can be equal to approximately four bytes (Bytes).
  • the OLT 110 or the receiver of the ONU 120 may delimit the frame using the Psync field in the received frame, such as separating or distinguishing the frames.
  • frame 200 may include FEC encoded control and/or user data and synchronization information.
  • frame 200 may correspond to a GTC or XGTC frame, such as a downstream frame from OLT 110 to ONU 120, and may be transmitted within a fixed time window.
  • Frame 200 can include a first portion 210 and a second portion 211.
  • the first portion 210 can correspond to a GTC or XGTC PCBd or header and can include time or synchronization information.
  • the second portion 211 can correspond to a GTC or XGTC payload and can include a plurality of codewords that may be FEC encoded.
  • the second portion 211 can include an integer number of FEC code words.
  • the downlink data frame XGTC frame is divided into a plurality of FEC information code blocks according to the FEC code block requirement, and the FEC coded information code block and the check bit (P) of each FEC code block together constitute an FEC code word.
  • a certain number of FEC codewords are combined into a payload of 125us PHY Frame and scrambled.
  • the scrambled PHY frame payload plus the field psbd for synchronization together form the PHY frame of the XGPON downlink.
  • the data synchronization is first performed according to the PSBD, then the payload portion is descrambled, and the starting position of the FEC is delimited to correctly parse the FEC encoding.
  • the second portion 311 can correspond to a GTC or XGTC payload and can include a plurality of codewords that may be FEC encoded.
  • the second portion 311 can include an integer number of FEC code words.
  • the GTC or XGTC payload may include a payload length downstream (Plend) 312, an upstream bandwidth map (US BWmap) 314, at least one physical layer operation, management and maintenance (PLOAM) field 316, and a payload 318.
  • Plend 312 may include multiple subfields including B length (Blen) and cyclic redundancy check (CRC). Blen may indicate the length of the US BWmap 314, for example in bytes.
  • the CRC can be used, for example, to verify at the ONU 120 whether there is an error in the received frame 300. For example, when the CRC fails, frame 300 can be discarded.
  • the subfield may also include an A length subfield that indicates the length of the ATM payload, which may include a portion of frame 300.
  • the US BWmap 314 can include an array of blocks or subfields, each of which can include a single bandwidth allocation to a single transmitter (TC) that can be used to manage upstream bandwidth allocations in the GTC layer.
  • the TC may be a transport entity in the GTC layer that may be configured to communicate higher layer information from the input to the output, such as from the OLT to the ONU.
  • Each block in BWmap 314 may include multiple subfields, such as an allocation identifier (Alloc-ID), a flag, a start time (SStart), a stop time (SStop), a CRC, or a combination of the above.
  • the PLOAM field 316 can include a PLOAM message that can be sent from the OLT to the ONU and includes an Operation, Management and Maintenance (OAM) related alarm or a threshold violation alarm triggered by a system event.
  • the PLOAM field 316 can include multiple subfields, such as an ONU identifier (ONU-ID), a message identifier (message ID), message data, and a CRC.
  • ONU-ID may include an address that may be assigned to one of the ONUs and used by the ONU to detect its intended message.
  • the message ID may indicate the type of PLOAM message and the message data may include the payload of the PLOAM message.
  • the CRC can be used to verify if there is an error in the received PLOAM message.
  • Frame 300 may include different PLOAMs 316 corresponding to different ONUs, which may be indicated by different ONU-IDs.
  • Payload 318 can include broadcast data (eg, User data).
  • payload 318 can include a GPON encapsulation method (GEM) payload.
  • GEM GPON encapsulation method
  • FIG. 4 illustrates another embodiment of a frame portion 400 that may include synchronization information.
  • frame portion 400 may correspond to a PSBd in a downstream GTC or XGTC frame.
  • the PSBd 410 can include a PSync mode 412, a superframe structure 414, and a PON-ID structure 420.
  • frame portion 200 or PSBd may include approximately 24 bytes, wherein each of Psync mode 412, superframe structure 414, and PON-ID structure 420 may include approximately eight bytes.
  • each of superframe structure 414 and PON-ID structure 420 can include HEC encoding that can be used to detect/correct errors in corresponding fields.
  • PSync mode 412 can be used to detect the beginning of a PSBd in a frame and can include approximately 64 bits.
  • the ONU can use PSync mode 412 to align frames on downstream frame boundaries.
  • the PSync mode 412 can include a fixed mode, such as 0xC5E51840FD59BB49.
  • Superframe structure 414 can include superframe counter 416 and HEC code 418.
  • Superframe counter 416 may correspond to approximately 51 most significant bits of superframe structure 414 and may specify the order of the downstream frames transmitted. For each downstream (XGTC or GTC) frame, superframe counter 416 may include a value greater than the previously transmitted downstream frame. When the superframe counter 316 reaches a maximum value, the subsequent superframe counter 316 in subsequent downstream frames may be set to approximately zero.
  • the HEC code 418 may correspond to approximately the 13 least significant bits of the superframe structure 414 and may be configured in a manner substantially similar to the HEC field described above.
  • HEC code 418 may be a combination of a BCH code that operates on approximately 63 initial bits of a frame header and a single parity bit.
  • the PON-ID structure 420 can include a PON-ID 422 and a second HEC code 424.
  • PON-ID 422 may correspond to approximately 51 bits of PON-ID structure 420, and the HEC code may correspond to the remaining approximately 13 bits.
  • the PON-ID 422 can be set by the OLT and used by the ONU to detect a protection switching event or to generate a security key.
  • the configuration of the second HEC code 424 can be substantially similar to the HEC field described above.
  • HEC code 418 can be used to detect/correct errors in superframe counter 416
  • second HEC code 424 can be used to detect/correct errors in PON-ID 422.
  • the HEC code can be added to the synchronization information in the additional bytes as described in the frame portion 300 or the frame portion 400, To provide sufficient or acceptable error detection/correction capabilities for synchronizing information at the ONU.
  • this HEC coding scheme can provide efficient error detection/correction. For example, when the ONU is in a deep sleep situation, the ONU can relock to the OLT at each particular time period (eg, every approximately 10 microseconds). Thus, in the case of a false lock, multiple errors may occur in additional bytes (eg, approximately 24 bytes) that are not subject to FEC encoding. However, with the HEC code in the extra bytes, the probability of preventing or resolving these errors can be quite high.
  • FIG. 5 illustrates an embodiment of a synchronization state machine 500 that can be used by an ONU to synchronize downstream transmission frames, such as frame 200.
  • Synchronization state machine 500 may use a PSync mode in the downstream frame that may not be FEC encoded, such as PSync mode 312 or PSync mode 412.
  • the PSync mode may be located in a portion of the downstream frame, such as PSBd, frame portion 300, or first portion 210.
  • the specific format of the PSBd frame may refer to FIG.
  • the PSync mode may be protected by HEC code, such as HEC fields.
  • the ONU can implement the synchronization state machine 500, for example, using software, hardware, or both.
  • Synchronization state machine 500 can begin in a seek state 510 where a search for PSync mode can be performed in all possible alignments (eg, bit and/or byte alignment). If the correct PSync mode is found, the synchronization state machine 500 can transition to a Pre-Sync state 520 in which a fixed length of time (eg, approximately 125 microseconds) can be performed after the last detected PSync mode. Search for the second PSync mode. If the second PSync mode is not successfully found in the pre-synchronization state 520, the synchronization state machine 500 can return from the pre-synchronization state 520 to the seek state 510.
  • the synchronization state machine 500 can transition to the Sync state 530. If the synchronization state 530 is reached, the synchronization state machine 500 can announce that the downstream frames are successfully synchronized, and then begin processing the frames. In an embodiment, if the ONU detects M consecutive incorrect PSync fields or modes (M is an integer), the synchronization state machine 500 may declare that the synchronization of the downstream frame was unsuccessful and return to the seek state 510. For example, M can be equal to two.
  • the GTC frame and the XGTC frame are mentioned above.
  • the XGTC frame is taken as an example.
  • the structure of the XGTC frame can be referred to FIG. 3.
  • the GTC frame can also be applied to the data parsing method of the present invention.
  • the degradation of different users under the same passive optical network is different, and the quality of the user link is very different.
  • the unified device upgrade will generate a large waste and increase the investment pressure of the customer.
  • the first FEC codeword in the XGTC frame can be protected by using the existing first FEC code, and the error correction capability is stronger than the first FEC code.
  • Two FEC encodings to protect the second FEC codeword in the XGTC frame There may be multiple first FEC codewords in the first FEC encoded protected XGTC frame, and multiple second FEC codewords in the XGTC frame protected by the second FEC encoding.
  • FIG. 6 is a format of an XGTC frame according to an embodiment of the present invention. Unlike the XGTC frame format of FIG. 2, the XGTC frame includes first FEC code words 614 and 618 protected by a first FEC coded RS (248, 216). In addition, second FEC code protected second FEC code words 622 and 626 that are stronger than the first FEC encoding error correction capability are also included.
  • the specified location join pointer indicates the start and end position of the second FEC codeword encoded by the second FEC, the finger It is visible to all ONUs protected by the second FEC encoding, and is invisible to the ONUs protected by the first FEC encoding, that is, only the ONUs protected by the second FEC encoding can parse the second FEC codewords, using the first FEC encoding.
  • the protected ONU does not have the function of parsing the second FEC codeword.
  • the location where the pointer is stored includes, but is not limited to, the following fields: a profile message field in the PLOA message, a new field in the BWmap, and a fixed position of the last first FEC codeword in each frame.
  • the ONU protected by the second FEC code can parse the first FEC codeword in addition to the second FEC codeword.
  • the ONU protected by the second FEC code is wired according to the following steps:
  • the ONU protected by the second FEC encoding is synchronized according to the state machine described in FIG. 5, wherein the value of M can be increased from 2 to 6, and the fault tolerant bit of Psync can be increased from 2 to 4.
  • the ONU protected by the second FEC encoding parses the first FEC codeword, and acquires pointer information from the first FEC codeword. For this ONU link, the message may be incorrect due to insufficient protection of FEC encoding. Confirmation is carried out in a consistent manner for four consecutive receptions.
  • the ONU protected by the second FEC code confirms that the second FEC codeword is parsed after the start and end of the second FEC codeword, and the second FEC codeword is included in the XGTC frame that the second FEC coded protected ONU interacts with the OLT.
  • a second FEC codeword may also include start location information and end location information of other second FEC codewords, such that the second FEC code-protected ONU that normally goes online may obtain other second FEC codes from the second FEC codeword.
  • the start position information and the end position information of the word since the probability of the error of the second FEC code word is lower than the first FEC code word, the position information can be resolved from the second FEC code word more quickly and accurately.
  • the start and stop positions (starting position and ending position) of the second FEC codeword required for the second FEC encoding cannot occur every frame. Change, that is, the position of the second FEC codeword cannot be One frame changes, but the adjustment is made as needed to maintain the starting and ending position to the next adjustment.
  • the designated location in the area protected by the first FEC-encoded RS (248, 216), the designated location is added to the pointer, which is visible to all ONUs protected by the second FEC encoding, and protected by the first FEC encoding.
  • the ONU is not visible, and the pointer content is used to indicate the ONUID of the ONU protected by the second FEC encoding and the start and end position of the second FEC codeword encoded by the second FEC.
  • a pointer is added in the area protected by the second FEC code, and the pointer is visible to all ONUs that are encoded by the second FEC, and is used to indicate start position information and end position information of the second FEC code word of the next frame.
  • the location where the pointer is stored includes, but is not limited to, the following fields: an attribute message field in the PLOAM message, a new field in the BWmap, and a fixed position of the last first FEC codeword in each frame.
  • the ONU protected by the second FEC encoding can parse the first FEC codeword in addition to the second FEC codeword.
  • the ONU protected by the second FEC code is uplinked according to the following steps: the ONU protected by the second FEC code is synchronized according to the state machine described in FIG. 5, wherein the value of M can be increased from 2 to 6, and the fault tolerance bit of Psync can be 2 increased to 4.
  • the ONU protected by the second FEC encoding receives an XGTC frame from the OLT, the XGTC frame includes a first FEC codeword, the ONU protected by the second FEC encoding parses the first FEC codeword, and obtains a pointer from the first FEC codeword information.
  • the message may be incorrect due to insufficient FEC protection.
  • the ONU protected by the second FEC encoding adopts a method of attempting to go online, and the second FEC codeword is correctly parsed as long as the start position information and the end position information of the second FEC codeword are correctly found once. After that, the start position information and the end position information of the second FEC code word can be found.
  • the ONU protected by the second FEC code confirms the start position information and the end position information of the second FEC codeword, and then parses the second FEC codeword included in the XGTC frame that the ONU interacts with the OLT to Get user data.
  • a second FEC codeword may also include start location information and end location information of other second FEC codewords, such that the second FEC code-protected ONU that normally goes online may obtain other second FEC codes from the second FEC codeword.
  • the start position information and the end position information of the word since the probability of the error of the second FEC code word is lower than the first FEC code word, the position information can be resolved from the second FEC code word more quickly and accurately.
  • the start position and the end position of the second FEC codeword of each XGTC frame are not required to be the same, and the real-time performance is improved.
  • FIG. 7 is a schematic diagram of a data parsing method according to an embodiment of the present invention, the method includes:
  • the ONU receives a downlink data frame from the OLT, where the downlink data frame includes a first FEC codeword protected by the first FEC encoding, and a second FEC codeword protected by the second FEC encoding.
  • the format of the downlink data frame can refer to FIG. 3, and the ONU can parse the second FEC codeword and parse the first FEC codeword.
  • the error correction capability of the second FEC code used by the second FEC codeword is stronger than the first FEC code used by the first FEC codeword, and the first FEC codeword includes the second FEC codeword.
  • Location information and the second FEC codeword end location information.
  • S720 The ONU parses the start position information and the end position information of the second FEC codeword from the first FEC codeword.
  • the ONU Since the ONU has the ability to parse the first FEC codeword, the ONU parses the start location information and the end location information of the second FEC codeword from the first FEC codeword.
  • the second FEC codeword start location information and the second FEC codeword end location information may be located in an attribute message field in a PLOAM message of the downlink data frame, where The field added in the row data frame BWmap message, or the pre-set position of the last first FEC codeword in the downlink data frame.
  • the first FEC codeword includes a Psync field of 64 bits in length. As shown in FIG. 4, the Psync field may be part of the PSBd, and the ONU receives the downlink data frame, and parses the first FEC of the downlink data frame. Before the codeword, the method further includes: the ONU searches for the Psync field included in the first FEC codeword, and after matching the M1 Psync fields, confirms that the downlink data frame is synchronized, and the Psync field of the first FEC codeword The matching includes matching N1 bits in the Psync field of the first FEC codeword.
  • the value of M1 may take 2
  • the value of N1 may take 62, that is, the fault-tolerant bit of the Psync field of the first FEC codeword is 2 bits.
  • the ONU may parse from the plurality of first FEC codewords, and the start position information and the end position information of the parsed second FEC codeword are both When the same, the position of the second FEC code word is determined based on the start position information and the end position information.
  • the ONU parses the second FEC codeword determined according to the start location information and the end location information to acquire user data.
  • the ONU can locate the second FEC codeword according to the start location information and the end location information of the second FEC codeword, and can obtain the user data after parsing the second FEC codeword.
  • the second FEC codeword may include a Psync field of 64 bits in length
  • the method further includes: the ONU reading a Psync field included in the second FEC codeword, After matching the M2 Psync fields, parsing the second FEC codeword according to the start position and the end position of the second FEC codeword to obtain user data, and the matching of the Psync field of the second FEC codeword includes matching N2 bits in the Psync field of the second FEC codeword, the M2 is greater than M1, and the N2 is less than N1.
  • the value of M2 may be 6, and the value of N2 may be 60, that is, the error-tolerant bit of the Psync field of the second FEC codeword is 4 bits.
  • the data parsing method of the embodiment of the present invention may further include the following steps:
  • the ONU acquires start position information and a knot of the other second FEC codeword from the second FEC codeword. Beam position information;
  • the ONU parses the second FEC codeword determined according to the start location information and the end location information of the other second FEC codewords to obtain user data.
  • the ONU determines the other second FEC codewords according to the start location information and the end location information of the other second FEC codewords, and parses the other second FEC codewords to obtain user data.
  • the data frame exchanged between the OLT and the ONU includes the first FEC coded first FEC codeword and the second FEC coded second FEC codeword, in the first FEC codeword.
  • the start location information and the end location information of the second FEC codeword are saved. Since the error correction capability of the second FEC encoding is stronger than the first FEC encoding, the technical solution of the embodiment of the present invention can reduce the error rate and improve the synchronization efficiency. .
  • different users in the same PON can select the FEC coding mode according to the link quality, which can be compatible with users with different needs and improve user satisfaction.
  • FIG. 8 is a structural diagram of an ONU according to an embodiment of the present invention, where the ONU includes:
  • the receiving unit 810 is configured to receive, by the OLT, a downlink data frame, where the downlink data frame includes a first FEC code protected first FEC codeword, and a second FEC code protected second FEC codeword, the second FEC code
  • the error correction capability of the second FEC code used by the word is stronger than the first FEC code used by the first FEC codeword
  • the first FEC codeword includes the second FEC codeword start position information and The second FEC codeword end position information is described.
  • the parsing unit 820 is configured to parse the start location information and the end location information of the second FEC codeword from the first FEC codeword, and parse the second determined according to the start location information and the end location information FEC codeword to get user data.
  • the second FEC codeword start location information and the second FEC codeword end location information may be located in an attribute message field in a PLOAM message of the downlink data frame, where the downlink data frame BWmap message is An added field, or a pre-set position of the last first FEC codeword in the downstream data frame.
  • the ONU may further include a search unit 830, where the first FEC codeword may include a physical synchronization Psync field of length 64 bits before the parsing unit 820 parses the first FEC codeword of the downlink data frame
  • the search unit 830 searches for the Psync field included in the first FEC codeword, and after matching the M1 Psync fields, confirms that the downlink data frame is synchronized, and the matching of the Psync field of the first FEC codeword includes matching N1 bits in the Psync field of the first FEC codeword.
  • the second FEC codeword may also include a physical synchronization Psync field of 64 bits.
  • the searching unit 830 may be further configured to: read the second FEC codeword.
  • the Psync field includes, after matching the M2 Psync fields, parsing the second FEC codeword according to the start position and the end position of the second FEC codeword to obtain user data, and the PSF of the second FEC codeword
  • the matching of the fields includes matching N2 bits in the Psync field of the second FEC codeword, the M2 being greater than M1, and the N2 being less than N1.
  • the receiving unit 810 of the embodiment of the present invention may be a receiver, the parsing unit 820 may be a decoder, and the function of the searching unit 830 may be implemented by a processor.
  • FIG. 9 is a structural diagram of an OLT according to an embodiment of the present invention, where the OLT includes:
  • the data generating unit 910 is configured to generate a downlink data frame, where the downlink data frame includes a first forward error correction FEC code protected first FEC codeword, and a second FEC code protected second FEC codeword, where The error correction capability of the second FEC code used by the second FEC codeword is stronger than the first FEC code used by the first FEC codeword, and the first FEC codeword includes the start position of the second FEC codeword Information and the second FEC codeword end location information;
  • the sending unit 920 is configured to send the downlink data frame to the optical network unit ONU.
  • the second FEC codeword in the downlink data frame generated by the data generating unit 910 may include start location information and end location information of other second FEC codewords.
  • the data generating unit 910 may be a framer, and the transmitting unit 920 may be a Transmitter.
  • the data frame exchanged between the OLT and the ONU includes the first FEC coded first FEC codeword and the second FEC coded second FEC codeword, in the first FEC codeword.
  • the start location information and the end location information of the second FEC codeword are saved. Since the error correction capability of the second FEC encoding is stronger than the first FEC encoding, the technical solution of the embodiment of the present invention can reduce the error rate and improve the synchronization efficiency. .
  • different users in the same PON can select the FEC coding mode according to the link quality, which can be compatible with users with different needs and improve user satisfaction.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • 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 in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and 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.
  • 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 integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • 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.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention concerne un procédé d'analyse syntaxique de données, comprenant : une unité de réseau optique (ONU) reçoit une trame de données de liaison descendante de la part d'un terminal de ligne optique (OLT). La trame de données de liaison descendante comprend un premier mot de code FEC protégé par le biais d'un premier codage de correction d'erreur directe (FEC) et un deuxième mot de code FEC protégé par un deuxième codage FEC, la capacité de correction d'erreur du deuxième codage FEC adopté par le deuxième mot de code FEC est plus forte que celle du premier codage FEC adopté par le premier mot de code FEC, et le premier mot de code FEC comprend des informations de position de départ à propos du deuxième mot de code FEC et des informations de position de fin à propos du deuxième mot de code FEC. L'ONU effectue une analyse syntaxique des informations de position de départ et des informations de position de fin à propos du deuxième mot de code FEC à partir du premier mot de code FEC, et l'ONU effectue une analyse syntaxique du deuxième mot de code FEC déterminé conformément aux informations de position de départ et aux informations de position de fin afin d'acquérir des données d'utilisateur. Le procédé d'analyse syntaxique de données selon les modes de réalisation de la présente invention permet de réduire un taux d'erreurs binaires, ce qui améliore l'efficacité de la synchronisation. L'invention concerne également un procédé de transmission de données correspondant, une ONU correspondante et un OLT.
PCT/CN2015/100244 2015-12-31 2015-12-31 Procédé et appareil d'analyse syntaxique de données et de transmission de données WO2017113349A1 (fr)

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