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WO2009152758A1 - Procédé et équipement permettant de transmettre les données de salve de la liaison montante dans le système de réseau optique passif - Google Patents

Procédé et équipement permettant de transmettre les données de salve de la liaison montante dans le système de réseau optique passif Download PDF

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Publication number
WO2009152758A1
WO2009152758A1 PCT/CN2009/072290 CN2009072290W WO2009152758A1 WO 2009152758 A1 WO2009152758 A1 WO 2009152758A1 CN 2009072290 W CN2009072290 W CN 2009072290W WO 2009152758 A1 WO2009152758 A1 WO 2009152758A1
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WO
WIPO (PCT)
Prior art keywords
burst
data
sequence
mirroring
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2009/072290
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English (en)
Chinese (zh)
Inventor
耿东玉
封东宁
李靖
梁伟光
埃芬博格·弗兰克
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/CN2008/073140 external-priority patent/WO2009152668A1/fr
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to HK11104606.5A priority Critical patent/HK1150690B/en
Priority to EP09765397.6A priority patent/EP2299609B1/fr
Publication of WO2009152758A1 publication Critical patent/WO2009152758A1/fr
Anticipated expiration legal-status Critical
Priority to US12/973,639 priority patent/US8571069B2/en
Priority to US13/473,166 priority patent/US8724661B2/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal

Definitions

  • the present invention relates to the field of passive optical network technologies, and in particular, to a method and apparatus for transmitting uplink burst data in a passive optical network system.
  • Passive Optical Network is the leader in optical access technology due to its advantages of easy maintenance, high bandwidth, and low cost. It is an ideal combination for accessing voice, data, video and other services through a single platform. Physical platform. PON technology is point-to-multipoint (P2MP) fiber access technology. The PON is composed of an Optical Line Terminal (OLT), an Opitcal Network Unit (ONU), and an Optical Distribution Network (ODN). Its advantages are derived from the passive optical splitter/combiner in the ODN. (Splitter/Coupler), so PON does not need to use components with amplification and relaying capabilities.
  • TDM time-division multiplexing
  • TDMA uplink time-division multiple access
  • the PON performs a burst-to-point burst mode (Burst) communication method.
  • the uplink transmission of the PON uses TDMA access to share its uplink channel.
  • the OLT allocates different time slots to each ONU.
  • the ONU only sends its own data information block in the time slot specified by the OLT.
  • the OLT Since the distance between different ONUs and OLTs is different in the PON system, the strength of the signals transmitted by the OLTs belonging to different ONUs will be different. Therefore, after the OLT receives the burst data frame of the ONU, it is necessary for the OLT receiving end to use the synchronization mode sequence (preamble) in the frame for automatic gain (AGC) and clock recovery (Clock Data Recovery, CDR). Then, the OLT uses the Burst Delimiter to match the received burst frame. When the sequence in the received frame matches the burst delimiter, the OLT can know the data in the burst frame. The starting position, thereby receiving data.
  • AGC automatic gain
  • CDR clock recovery
  • the burst frame structure of the uplink transmission of the existing PON system defines a sequence of 0, 1 interval, binary "1010" (the hexadecimal is "0x55") as an existing sequence of synchronization patterns.
  • the synchronous mode sequence is used by the OLT to perform automatic gain and clock recovery on the received burst frame. It has been found that the spectrum of the synchronous mode sequence signal is concentrated at high frequency components, which is disadvantageous for using a low complexity equalizer at the OLT receiving end. And the frequency of the hopping is fast, which makes the existing peak detector unable to detect the actual peak value of the received signal, which may cause degradation of the receiver sensitivity.
  • Embodiments of the present invention provide a method for providing uplink burst data in a PON system, wherein a spectrum component of a synchronous mode sequence is relatively flat throughout a spectrum interval, which enables a receiver of a high-speed PON system to use a relatively simple equalizer. .
  • Embodiments of the present invention provide a method for transmitting uplink burst data in a passive optical network system, including:
  • a synchronization mode sequence for transmitting uplink burst data wherein the synchronization pattern sequence length is an integer multiple of 66 bits, and is connected by a 66-bit gene block unit;
  • an embodiment of the present invention provides an apparatus for providing uplink burst data in a passive optical network system, where the apparatus includes:
  • the synchronization pattern sequence length being 66 An integer multiple of a bit, connected by a 66-bit gene block;
  • the present invention further provides a signal consisting of a bit stream, the signal being uplink burst data in a passive optical network system, wherein the signal is connected end-to-end with a gene block of 66 bits in length.
  • the resulting sync pattern sequence, the burst delimiter, the data subject to forward error correction protection, and the burst end delimiter, the length of the signal being an integer multiple of 66 bits.
  • the embodiment of the invention further provides a method for transmitting an uplink burst in a passive optical network, where the method is:
  • the synchronization pattern sequence length being an integer multiple of 32 bits, and being connected by a 32-bit gene block unit;
  • the burst frame header is used to detect a link error rate, an optical network unit identifier, and a real-time status report of the optical network unit;
  • a device for transmitting an uplink burst in a passive optical network includes: a synchronization mode sequence sending unit, configured to send a synchronization mode sequence, where the synchronization mode sequence length is an integer multiple of 32 bits, and is 32 The genetic blocks of bits are connected in units;
  • a burst delimiter sending unit configured to send a burst delimiter
  • a burst frame header sending unit configured to send a burst frame header, where the burst frame header is used to detect a link error rate, an optical network unit identifier, and a real-time status report of the optical network unit;
  • the transmission convergence layer data frame header sending unit is configured to send a transmission convergence layer data frame header; and the data payload sending unit is configured to send a data payload.
  • a signal consisting of a bit stream which is uplink burst data in a passive optical network system, and the signal includes:
  • the spectral components of the synchronous mode sequence are relatively flat throughout the spectrum interval, which enables a relatively simple equalizer to be used at the receiving end of the high speed PON system.
  • FIG. 1 is a schematic structural diagram of burst data transmitted in the uplink according to an embodiment of the present invention
  • FIG. 2 is a block diagram of a synchronous mode sequence according to an embodiment of the present invention
  • FIG. 3 is a diagram showing changes in content in a FIFO queue according to an embodiment of the present invention
  • FIG. 5 is a spectrum diagram of a synchronization pattern sequence generated by the end of the gene 1;
  • FIG. The embodiment of the invention provides a block diagram of the uplink burst data in the passive optical network system.
  • FIG. 7 is a schematic diagram of the structure of the burst data transmitted in the uplink according to the second embodiment of the present invention
  • FIG. 8 is a schematic diagram of transmitting the uplink burst according to the second embodiment of the present invention
  • FIG. 9 is a frequency spectrum diagram of a sequence of genes 10
  • FIG. 10 is a block diagram of an apparatus for uplink burst data according to a second embodiment of the present invention.
  • the technical solution is described by taking a 10GEPON (10G Ethernet Passive Optical Network) system as an example.
  • the synchronous mode sequence and the burst delimiter are not protected by the FEC encoding, and the burst delimiter is followed by the FEC codeword, that is, the FEC protected Ethernet data.
  • the burst delimiter is used to identify the beginning of the FEC protected portion of the data in the burst.
  • the synchronization pattern sequence is used by the OLT to perform automatic gain and clock recovery on the received burst frame.
  • the synchronization pattern sequence designed by the embodiment of the present invention is composed of 66-bit gene blocks.
  • Figure 2 provides a set of gene blocks that can be used to generate a synchronized pattern sequence as described in the embodiments of the present invention, and the basic gene block is shown in Figure 2.
  • a new gene block designing a synchronous pattern sequence can be obtained by inverting or mirroring or cyclically shifting the basic gene block shown in FIG. 2.
  • the synchronization pattern sequence designed in the embodiment of the present invention is composed of these gene blocks in units of head and tail.
  • More gene blocks that can be used to generate the synchronized pattern sequences of the present invention can be derived from the basic gene block of Figure 2.
  • the basic gene block 1 is reversed to generate a gene block:
  • the basic gene block 1 is generated by image processing:
  • the image processing can be understood as reverse processing, for example, the result of the ABCD image processing is DCBA.
  • the basic gene block 1 cyclic shift generates a gene block: The above is a cyclic shift 1 bit processing, and any bit can be moved in practical applications.
  • more gene blocks can be obtained by inverting, mirroring or cyclically shifting the basic gene block provided in Figure 2. And the gene block can still be obtained by reversing the basic gene block or reversing the shift after mirroring.
  • the basic gene block is:
  • the basic gene blocks provided in Figure 2 and the gene blocks obtained by the basic gene block have the following special features.
  • the synchronization mode sequence designed in the embodiment of the present invention has an integer multiple of 66 bits, and the synchronization mode sequence is composed of a 66-bit gene block unit end-to-end;
  • the synchronous mode sequence designed by the embodiment of the present invention is a DC balanced sequence, and the runs of 0 and 1 are the same, and the maximum run length is 6.
  • the ONU is a switch that needs to control the transmitter laser.
  • the ONU's laser should be turned off to avoid affecting the transmission of the adjacent ONU.
  • the switch of the laser is controlled by a data detector. When the data detector detects that the data to be transmitted arrives, the ONU turns on the laser.
  • a variation of the contents of the first in first out (FIFO) queue in the embodiment of the present invention describes a method of providing uplink burst data.
  • the FIFOs before and after replacement can be used as follows:
  • IDLE is the value of the original FIFO queue tail. Disturbed IDLE
  • IDLE BD is replaced with sync burst delimiter
  • the FIFO sequence number 0 is the queue header and N-1 is the queue tail.
  • the values before and after replacement are in block (block), which is an integer multiple of 66 bits.
  • N is the length of the queue and is related to the synchronization time. The data in the queue is then sent out in turn according to the first in first out rule.
  • the FIFO adopts a first-in first-out rule, firstly a sequence of synchronization patterns of the uplink burst data, for example, using a synchronization pattern sequence, which is N-3 66-bit genes 1 of FIG. 2 provided by the embodiment of the present invention, that is, N-3.
  • a synchronization pattern sequence which is N-3 66-bit genes 1 of FIG. 2 provided by the embodiment of the present invention, that is, N-3.
  • the head and tail are connected to each other.
  • a burst delimiter for the upstream burst data is then provided.
  • the FEC protected data in the upstream burst data is then provided.
  • a burst end delimiter of the uplink burst data is provided.
  • each part of the uplink burst data provided by the ONU that is, the ONU will burst data.
  • the various parts mentioned here include: Synchronous mode sequence, burst delimiter, subject to FEC The protected data, and the burst end delimiter are four parts.
  • the foregoing method for providing uplink burst data in a passive optical network system that is, a method for transmitting uplink burst data in a passive optical network system includes:
  • Step 11 Send a synchronization pattern sequence of uplink burst data, where the sequence length of the synchronization pattern is an integer multiple of 66 bits, and is connected by a 66-bit gene block unit;
  • Step 12 Send a burst delimiter of the uplink burst data
  • Step 13 Send data that is protected by forward error correction in the uplink burst data.
  • Step 14 Send a burst end delimiter of the uplink burst data.
  • the data of the uplink burst is finally generated, which is a signal composed of a bit stream, and the signal is a synchronous mode sequence which is connected by a gene block of 66 bits in length.
  • the burst delimiter, the FEC protected data, and the burst end delimiter, the length of the signal is an integer multiple of 66 bits.
  • the synchronous mode sequence is a DC balanced sequence, and the runs of 0 and 1 in the binary code are the same, and the maximum run is 6.
  • the 66-bit gene block described in the application can be obtained from the basic gene block shown in Figure 2 or by inversion or mirroring or cyclic shift processing of the basic gene block, and the basic gene block is inverted or mirrored and recirculated. Gene blocks are still available. Burst data is sent to the OLT. The OLT receiver will use the transition between 0 and 1 of the burst synchronization pattern in the burst data to clock recovery and automatic gain of the received data.
  • the synchronous mode sequence designed by the embodiment of the present invention is a DC balanced sequence, and the run lengths of 0 and 1 are the same, and the maximum run length is 6, so that the peak detector at the receiving end can detect the peak level of the received signal close to 100%.
  • Figure 5 is a spectrogram of a synchronized pattern sequence generated by the end of the gene 1 connection. It can be seen from FIG. 5 that the spectrum of the synchronization pattern sequence of the uplink burst data in this embodiment is a solid line, and the entire frequency interval is relatively flat. The dashed line is the spectrogram of the prior art synchronous mode sequence, and the spectral components are concentrated at high frequencies. It can be seen from the figure that the implementation has received relatively good results.
  • the embodiment of the present invention further provides an apparatus for providing uplink burst data in a passive optical network system.
  • the apparatus 5 includes: a unit 501 for providing a synchronization pattern sequence of the uplink burst data, wherein the synchronization pattern sequence length is an integer multiple of 66 bits, and is formed by connecting 66-bit gene blocks as a unit end-to-end;
  • a unit 504 that provides a burst end delimiter for the upstream burst data.
  • the synchronization mode sequence provided by the unit of the synchronization mode sequence of the uplink burst data is a DC balance sequence, and the runs of 0 and 1 in the binary code are the same, and the maximum run is 6.
  • the 66-bit gene block described in the application may be obtained by the basic gene block shown in FIG. 2 or by inversion or mirroring or cyclic shift processing of the basic gene block, and the basic gene block is inverted or mirrored and then recirculated and shifted. Gene blocks are still available.
  • the second embodiment of the present invention describes a technical solution by taking a Gigabit-Capable Passive Optical Network (GPON) system as an example.
  • the uplink burst data sent by the ONU is composed of PLOu (Physical Layer Overhead upstream), GTC (GPON Transmission Convergence) overhead (data frame header) and GTC payload (data payload) fields.
  • PLOu Physical Layer Overhead upstream
  • GTC GPON Transmission Convergence
  • GTC payload data payload
  • the physical control header of the ONU uplink burst frame of the GPON system is composed of a synchronization mode sequence, a delimiter and a burst frame header, and the synchronization pattern sequence and delimiter are all formulated according to the parameters included in the Upstream_Overhead sent by the OLT. .
  • the sync pattern sequence is used by the OLT to perform automatic gain and clock recovery for the received burst frame.
  • This embodiment further provides a method for transmitting an uplink burst in a passive optical network. As shown in Figure 8:
  • S101 Send a synchronization mode sequence of uplink burst data, where the sequence length of the synchronization mode is an integer multiple of 32 bits, and is formed by connecting 32-bit gene blocks.
  • the sequence of synchronization patterns transmitted in practice consists of a 32-bit gene block that is extended.
  • Table 1 provides a set of gene blocks that can be used to generate the synchronized pattern sequences described in the Examples of the present invention, and the basic gene blocks are shown in Table 1.
  • a new gene block designing a synchronous pattern sequence can be obtained by inverting or mirroring or cyclically shifting the basic gene block shown in Table 1.
  • the synchronization pattern sequence designed in the embodiment of the present invention is composed of these gene blocks as a unit end to end.
  • the basic gene block 10 is inverted to generate a gene block:
  • the basic gene block 10 is generated by mirroring:
  • the mirroring process can be understood as a reverse processing, for example, the result of the ABCD mirroring process is DCBA.
  • the basic gene block 10 cyclically shifts to generate a gene block:
  • more gene blocks can be obtained by inverting, mirroring or cyclically shifting the basic gene block provided in Table 1. And the gene block can still be obtained by reversing the basic gene block or reversing the shift after mirroring.
  • the basic gene blocks provided in Table 1 and the gene blocks obtained by the basic gene block have the following characteristics:
  • the length of the synchronization pattern sequence designed in this embodiment is an integer multiple of 32 bits, and the synchronization pattern sequence is composed of a 32-bit gene block unit end-to-end;
  • the synchronous mode sequence designed by the embodiment of the present invention is a DC balanced sequence, and the runs of 0 and 1 are the same, and the maximum run length is 4.
  • the OLT selects the corresponding delimiter sequence from Table 1 according to the requirements of different systems.
  • the system can select a sequence of 32 bits defined as Ox BB52 1E26 (binary is 1011 1011 0101 0010 0001 1110 0010 0110).
  • the OLT sender defines this sequence in Upstream_Overhead, and then the OLT's pre-defined Upstream_Overhead is embedded in the downstream PLOAMd signaling.
  • the ONU transmits a sequence of synchronization patterns of its uplink bursts according to the sequence of synchronization patterns in Upstream_Overhead received in PLOAMd.
  • the synchronization mode sequence sent by the embodiment of the present invention is a DC balance sequence, and the runs of 0 and 1 are the same, and the maximum run length is 4.
  • the transmission of the uplink burst is completed, and the above-mentioned one bit stream is combined to form a signal.
  • the OLT receiving end After the OLT receiving end receives the uplink burst data sent by the ONU, the OLT receiving end will use the transition between 0 and 1 of the burst synchronization mode sequence in the burst data to perform clock recovery on the received data. Automatic gain.
  • Figure 9 is a spectrogram of the sequence of the gene 10 in Table 1 of the present Example. It can be seen from Fig. 9 that the spectrum of the synchronization pattern sequence of the uplink burst data in this embodiment is a solid line, and the entire spectrum interval is relatively flat. The dashed line is the spectrogram of the synchronous mode sequence in the prior art, and the spectral components are concentrated at high frequencies. It can be seen from the figure that this embodiment has received relatively good results. This embodiment allows the peak detector at the receiving end to detect a peak level of nearly 100% of the received signal.
  • the device 90 includes:
  • the synchronization mode sequence transmitting unit 901 is configured to send a synchronization mode sequence, the sequence length of which is an integer multiple of 32 bits, and is connected by a 32-bit gene block unit.
  • the synchronization pattern sequence transmitted by the synchronization pattern sequence transmission unit 901 is a DC balance sequence, and the runs of 0 and 1 are the same, and the maximum run length is 4.
  • the 32-bit gene block described in the application may be the basic gene block shown in Table 1 or obtained by inverting or mirroring or cyclically shifting the basic gene block. Obtained, and the gene block is still obtained by reversing the basic gene block or reversing the shift after mirroring.
  • the burst delimiter sending unit 902 is configured to send a burst delimiter.
  • a burst header transmission unit 903 is configured to send a burst header, and the burst header is used to detect a link error rate, a real-time status report identifying the ONU-ID, and the ONU.
  • the transmission convergence layer data frame header sending unit 904 is configured to send a transmission convergence layer data frame header.
  • the data payload sending unit 905 is configured to send a data payload.
  • the spectrum component of the synchronous mode sequence transmitted by the apparatus of the embodiment of the present invention is relatively flat throughout the spectrum interval, which enables the receiver of the high speed system to use a relatively simple equalizer.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention se rapporte à un procédé permettant de transmettre les données de salve de la liaison montante dans le système de réseau optique passif, le procédé consistant à : transmettre la configuration de synchronisation des données de salve de la liaison montante, la longueur de la configuration de synchronisation étant un multiple entier de 66 bits et les unités constituées de blocs de gène de 66 bits étant reliées pour former la configuration de synchronisation (S11) ; transmettre le délimiteur de salve des données de salve de la liaison montante (S12) ; transmettre les données protégées par correction d'erreurs sans voie de retour dans les données de salve de la liaison montante (S13) ; transmettre l’extrémité du délimiteur de salve des données de salve de la liaison montante (S14).
PCT/CN2009/072290 2008-06-19 2009-06-16 Procédé et équipement permettant de transmettre les données de salve de la liaison montante dans le système de réseau optique passif Ceased WO2009152758A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
HK11104606.5A HK1150690B (en) 2008-06-19 2009-06-16 Method and equipment for transmitting the uplink burst data in the passive optical network system
EP09765397.6A EP2299609B1 (fr) 2008-06-19 2009-06-16 Procédé et équipement permettant de transmettre les données de salve de la liaison montante dans le système de réseau optique passif
US12/973,639 US8571069B2 (en) 2008-06-19 2010-12-20 Method and device for sending uplink burst data in passive optical network system
US13/473,166 US8724661B2 (en) 2008-06-19 2012-05-16 Method and device for sending uplink burst data in passive optical network system

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN200810068007.1 2008-06-19
CN200810068007 2008-06-19
PCT/CN2008/073140 WO2009152668A1 (fr) 2008-06-19 2008-11-21 Procédé et appareil pour produire des données en rafale de liaison montante dans un réseau optique passif
CNPCT/CN2008/073140 2008-11-21
CN2009100081031A CN101610429B (zh) 2008-06-19 2009-03-02 提供无源光网络系统中上行突发数据的方法及装置
CN200910008103.1 2009-03-02

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/973,639 Continuation US8571069B2 (en) 2008-06-19 2010-12-20 Method and device for sending uplink burst data in passive optical network system

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WO2009152758A1 true WO2009152758A1 (fr) 2009-12-23

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Cited By (2)

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US20130114962A1 (en) * 2010-07-26 2013-05-09 Nec Corporation Communication device, communication system, communication method, and program
CN112655220A (zh) * 2018-09-10 2021-04-13 华为技术有限公司 数据传输方法、相关装置及系统

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CN1848731A (zh) * 2005-04-13 2006-10-18 华为技术有限公司 一种千兆无源光网络系统

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HUAWEI: "10G EPON Upstream Synchronizer Performance", IEEE P802.3AV TASK FORCE, 1 May 2008 (2008-05-01), pages 1 - 4, XP008141075, Retrieved from the Internet <URL:www.ieee802.org/3/av/public/200805/3av0805effenberger2.pdf> *
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130114962A1 (en) * 2010-07-26 2013-05-09 Nec Corporation Communication device, communication system, communication method, and program
CN112655220A (zh) * 2018-09-10 2021-04-13 华为技术有限公司 数据传输方法、相关装置及系统
EP3780646A4 (fr) * 2018-09-10 2021-07-07 Huawei Technologies Co., Ltd. Procédé de transmission de données, appareil et système associés
CN112655220B (zh) * 2018-09-10 2022-08-26 华为技术有限公司 数据传输方法、相关装置及系统
US11509395B2 (en) 2018-09-10 2022-11-22 Huawei Technologies Co., Ltd. Data transmission method, related apparatus, and system
US11909446B2 (en) 2018-09-10 2024-02-20 Huawei Technologies Co., Ltd. Data transmission method, related apparatus, and system

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