WO2019128287A1 - Procédé et système d'échange de cellules basés sur un service flexe - Google Patents

Procédé et système d'échange de cellules basés sur un service flexe Download PDF

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Publication number
WO2019128287A1
WO2019128287A1 PCT/CN2018/103426 CN2018103426W WO2019128287A1 WO 2019128287 A1 WO2019128287 A1 WO 2019128287A1 CN 2018103426 W CN2018103426 W CN 2018103426W WO 2019128287 A1 WO2019128287 A1 WO 2019128287A1
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Prior art keywords
slice
packet
module
slice packet
length
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PCT/CN2018/103426
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English (en)
Chinese (zh)
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蔡林洋
海增强
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烽火通信科技股份有限公司
武汉飞思灵微电子技术有限公司
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Publication of WO2019128287A1 publication Critical patent/WO2019128287A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • H04J3/1658—Optical Transport Network [OTN] carrying packets or ATM cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/90—Buffering arrangements
    • H04L49/9057—Arrangements for supporting packet reassembly or resequencing
    • 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
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • 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
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0057—Operations, administration and maintenance [OAM]
    • H04J2203/006—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols

Definitions

  • the present invention relates to the field of communications, and in particular, to a cell exchange method and system based on a FlexE service.
  • FlexE (Flex Ethernet) technology is a new flexible Ethernet technology that has not only achieved MAC address and physical interface rate decoupling, but also greatly enhanced Ethernet interface application flexibility, and can expand FlexE shim exchange and OAM extension. , ultra-fast protection switching technology, clock synchronization and other technologies, as an important solution for the mobile backhaul network in the 5G era.
  • Flex Ethernet is an intermediation layer established between the MAC and the physical layer (PHY) or the Entity Coding Sublayer (PCS), which is used to adjust the elastic mechanism of matching from the MAC rate and the PCS rate to obtain information about the packet and Information on the data rate and instruct the PCS to recode as needed.
  • PHY physical layer
  • PCS Entity Coding Sublayer
  • a flexible packet length cell switching mechanism is established through the packet switching mechanism based on Flex Ethernet service transmission. After the data packet passes through the cell switching matrix, And then restore the content and rate of the FLEX client 66B stream. This mechanism can increase the protection and management capabilities of data streams, more flexible device capacity expansion, and enable ultra-low service delays.
  • the breakthrough in distributed FLEXE cell switching technology is that FLEXE becomes ultra-large-scale and ultra-low-latency. The necessary conditions for the core bearer network technology.
  • the FLEX Client 66B data stream that has not been sliced is directly cached and forwarded into a complete package. It takes a long time for the cache to forward a complete package, and the cache time is long and is not added.
  • the data packet field cannot monitor the delay time and link status. When the data transmission error occurs, the error data cannot be quickly located and cannot be recovered in time, resulting in low transmission efficiency and poor reliability of the FLEX data stream. .
  • the object of the present invention is to provide a method for implementing ultra-low delay cell switching based on the FlexE service, and buffering and forwarding the slice packet after slicing, so that the transmission efficiency is high and the reliability is good. .
  • a cell exchange method based on FlexE service comprising the steps of:
  • the receiving end buffers the received slice package, parses the packet overhead before or after buffering the slice package, obtains a time stamp of the slice package, and obtains a path of the slice package according to the time stamp of the slice package and the time when the receiving end receives the slice package. Delay, determining whether the path delay of the slice packet exceeds a preset maximum line delay, and if not, reading the slice packet, and stripping the packet overhead of the slice packet to reassemble the slice packet payload, if , an alarm signal is sent.
  • the method further includes the step of: performing time synchronization by using a synchronization signal in the transmitting end and the receiving end in the FLEX cell packet switching system.
  • the FLEX data stream is sequentially divided into a plurality of slices.
  • the method before determining whether the path delay of the slice packet exceeds a preset maximum line delay, the method further includes the step of: detecting, by the receiving end, whether the length of the received slice packet is consistent with the configured slice packet length. If the information is inconsistent, an alarm signal is generated, and the packet content of the corresponding byte is added to the slice packet whose length is inconsistent, so that the length of the supplemented slice packet is consistent with the configured slice packet length.
  • the method before determining whether the path delay of the slice packet exceeds a preset maximum line delay, the method further includes the steps of: performing a CRC check on the received slice packet, and if the CRC check is incorrect, issuing Alarm signal.
  • the invention also provides a cell switching system based on the FlexE service, comprising a slicing module, a cell switching matrix, a receiving end caching module and a recombining module:
  • the slicing module is configured to sequentially split the FLEX data stream into a plurality of slice packets at the transmitting end, and insert a time-stamped packet overhead into the slice packet, and send the slice packet after inserting the packet overhead to the cell switching matrix. ;
  • the cell switching matrix is configured to send the received slice packet to a receiving end of the corresponding link according to the channel link;
  • the receiving end cache module is configured to cache the received slice package at the receiving end
  • the reassembly module is configured to parse the packet overhead before or after buffering the slice packet, obtain a time stamp of the slice packet, and obtain a path delay of the slice packet according to a time stamp of the slice packet and a time when the receiver receives the slice packet, Determining whether the path delay of the slice packet exceeds a preset maximum line delay. If not, the slice packet is read, and the packet payload of the slice packet is stripped, and the payload of the slice packet is reassembled. Alarm signal.
  • a clock module is further included, and the clock module is connected to the slicing module and the recombining module, where the clock module is used to perform synchronization signals on a transmitting end and a receiving end in a FLEX cell packet switching system. Time synchronization.
  • the system further includes a control module, configured to generate a plurality of sets of slice control signals according to the configured slice packet length, each set of slice control signals including a start pulse control signal and an end pulse control signal;
  • the sculpt module is further configured to receive the start pulse control signal and the end pulse control signal, and after receiving the start pulse control signal, start to read the data code stream byte by byte from the buffer module of the transmitting end, and receive After the end of the pulse control signal, the data stream is stopped to be read, and the read data stream is used as a slice packet.
  • the system further includes a slice packet length detecting module and a processing module, where the slice packet length detecting module is configured to detect, at the receiving end, whether the length of the received slice packet is consistent with the configured slice packet length. If they are inconsistent, an alarm signal is sent;
  • the processing module is configured to: after receiving the alarm signal of the slice packet length detecting module, supplement the data packet content of the corresponding byte in the slice packet whose length is inconsistent, so that the length of the added slice packet and the configured slice packet length Consistent.
  • the verification module is further configured to perform a CRC check on the received slice packet at the receiving end before determining whether the path delay of the slice packet exceeds a preset maximum line delay. If the CRC check is incorrect, an alarm signal is issued.
  • the present invention has the advantages that the FlexE service-based cell exchange method of the present invention slices the FLEX data stream, divides it into a plurality of smaller unit cell slice packets, and inserts Packet overhead, because the number of bytes per packet is small, the time required for buffering and transmission is short, so that the path delay to the receiving end is small, realizing ultra-low latency cell switching, and when smaller slice packets appear
  • the slice packet abnormality can be quickly detected, and the abnormal slice package can be repaired in time, thereby making the transmission of the FLEX data stream more efficient and reliable.
  • FIG. 1 is a flowchart of a method for exchanging a cell based on a FlexE service according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a clearing synchronization performed by a transmitting end and a receiving end by a time stamp synchronization signal according to an embodiment of the present invention
  • FIG. 3 is a structural block diagram of a cell switching system based on a FlexE service according to an embodiment of the present invention.
  • an embodiment of the present invention provides a method for exchanging a cell based on a FlexE service, which is used for transmitting a FLEX client 66B code stream slice data packet, and is applicable to various MAC rate services in a FlexE system, including steps. :
  • S1 The sender and the receiver in the FLEX cell packet switching system perform time synchronization by using a time stamp synchronization signal
  • the sender buffers the FLEX data stream, and divides the FLEX data stream into a plurality of slice packets according to the configured slice length.
  • a packet with a time stamp is inserted into the slice package.
  • S3 the cell switching matrix performs data packet exchange on the received slice packet according to the channel link, and sends the packet to the receiving end of the corresponding link;
  • S4 The receiving end buffers the received slice packet
  • S5 parsing the packet overhead field before or after buffering the slice packet, obtaining a time stamp of the slice packet, and obtaining a path delay of the slice packet according to a time stamp of the slice packet and a time when the receiver receives the slice packet, and determining a path of the slice package Whether the delay is within the preset maximum line delay. If it is not exceeded, the buffered slice packet is read, and the packet overhead of the slice packet is stripped, and the slice packet payload is reorganized to restore the data stream content of the slice packet payload. If it is exceeded, an alarm signal is sent.
  • step S1 specifically includes the following steps:
  • S101 The system generates a periodic synchronization signal and a stable reference clock, the synchronization signal is a periodic pulse signal, and the synchronization signal and the reference clock are simultaneously connected to the transmitting end and the receiving end;
  • S102 The transmitting end and the receiving end generate a cyclic time stamp according to the synchronization signal and the reference clock, and the time stamp is accumulated by using the reference clock.
  • the accumulator is cleared, the time stamp starts counting from 0, and the time is agreed.
  • the maximum value of the tag is MAX_TIME.
  • the maximum value of the time stamp MAX_TIME should be greater than the preset maximum line delay.
  • the time synchronization between the transmitting end and the receiving end in the FLEX cell packet switching system is synchronized by the synchronization signal, so that the time consistency between the transmitting end and the receiving end can be ensured, so that the path delay of the obtained slice packet is more accurate. , reliability is good.
  • step S2 The specific steps of the above step S2 are:
  • S202 The sending end continuously buffers the serial FLEX client 66B data code stream
  • the system After the number of bytes of the FLEX data stream buffered by the sending end reaches a slice packet length, according to the configured slice packet length, the system generates a start pulse control signal and an end pulse control signal of the sliced packet, when the transmitting end receives After the start of the pulse control signal, the data stream is read byte by byte from the buffered FLEX data stream, and after receiving the end pulse control signal, the reading of the data stream is stopped, and each group of slice control signals is The data stream read between the start pulse control signal and the end pulse control signal is used as a slice packet, and the packet overhead field further includes a packet start field corresponding to the start pulse control signal and a packet end field corresponding to the end pulse control signal. , packet data valid field, time stamp, slice packet sequence, link status, and CRC field;
  • S204 Send the slice packet to the cell switching matrix after inserting the packet overhead in the slice packet.
  • S205 Repeat the above steps S203-S204 when the number of bytes of the FLEX data stream buffered by the sender reaches the next slice packet length.
  • the configured slice packet length is the number of bytes of one slice packet
  • the start pulse control signal and the end pulse control signal correspond to the configured slice packet length, that is, at the start pulse control signal and the end pulse control.
  • the number of bytes of the data stream read between the signals is the number of bytes of one slice.
  • S401 Configure the receiving end to read the start of the slice packet.
  • S402 Detect whether an error occurs in the control information of the received slice packet, such as a continuous header or a continuous packet tail, or a slice packet length error;
  • S403 The receiving end buffers the received slice packet and the time when the slice packet is received.
  • step S5 The specific steps of the above step S5 are:
  • S501 After reading a slice packet, parsing a packet overhead field of the slice packet, obtaining a time stamp of the slice package, a slice packet sequence, a link state and a CRC field, a packet start field, a packet end field, and a packet data valid field, and the like. .
  • step S502 performing slice packet length detection, slice packet sequence detection, link state detection, and CRC check on the slice packet at the same time, and only after the slice packet length detection, the slice packet sequence detection, the link state detection, and the CRC check are all qualified, Go to step S503.
  • the process of detecting the length of the sliced packet is: detecting whether the length of the received sliced packet is consistent with the length of the configured sliced packet, and if it is consistent, it indicates that the sliced packet length is qualified. If not, the sliced packet length is determined. If the alarm signal is not met, the system will add the data packet of the corresponding byte in the received slice packet after receiving the alarm signal, so that the length of the supplemented slice packet is consistent with the configured slice packet length. The length of the slice package is changed from unqualified to qualified.
  • the process of detecting the sequence of the sliced packet is: detecting whether the sequence of the sliced packet conforms to the sequence order.
  • the sequence of the packet is 1 to 8 cycles, and if the sequence of the sliced packet is 1, the sequence of the next slice is 2, and then A slice packet sequence is 3, and so on. If the slice packet sequence is not in accordance with the sequence order, it indicates that there is packet loss, the slice packet sequence is unqualified, and an alarm signal is sent. If the sequence order is met, the slice packet sequence detection is performed. qualified.
  • the link state detection process is as follows: when the link state is abnormal, an alarm signal is sent, indicating that the link state detection is unqualified. When the link state is normal, the link state detection is qualified.
  • the link status includes link normal status, signal weakening, signal failure, service layer signal failure, non-FLEX Client 66b code stream transmission, and reservation status, and uses 0x1, 0x2, 0x3, 0x4, 0x7 and respectively in the packet overhead field. Other indications.
  • the process of CRC check is: in order to ensure the robustness of the slice packet transmission, the packet overhead field added by the sender in the slice packet is inserted into the 4-bit CRC field, and the receiving end performs CRC on the received slice packet according to the parsed CRC field.
  • S503 Obtain a path delay of the slice packet according to a time stamp of the slice packet and a time when the receiver receives the slice packet, where the maximum line delay is a maximum packet path delay time allowed by the system, and whether the path delay of the slice packet is determined. If the range is within the preset maximum line delay, the process goes to step S504, and if it is not within the range, the process goes to step S505.
  • S504 Stripping the packet overhead of the slice packet, accumulating the slice packet payload to more than one byte of a field of the output code stream, and re-splicing the accumulated slice packet payload into a continuous FLEX client 66B code stream, and re-splicing
  • the spliced FLEX client 66B code stream is buffered into the data cache to complete the reorganization of the slice packet payload.
  • S505 Send an alarm signal.
  • the method for exchanging a cell based on FlexE service of the present invention performs slice processing on a FLEX data stream, divides it into slice packets of a plurality of smaller unit cells, and inserts a packet overhead, and outputs the corresponding link to the corresponding chain through the cell exchange matrix.
  • the time required for buffering and transmission is short, so that the path delay to the receiving end is small, and ultra-low delay cell switching is realized, and when a small slice packet is obtained
  • the slice packet abnormality can be quickly detected, and the abnormal slice package can be repaired in time, thereby making the transmission of the FLEX data stream more efficient and reliable.
  • an embodiment of the present invention further provides a cell switching system based on a FlexE service, including a clock module, a sender buffer module, a slicing module, a cell switching matrix, a receiving buffer module, and a reassembly module.
  • the clock module is used for time synchronization by the synchronization signal at the transmitting end and the receiving end in the FLEX cell packet switching system.
  • the sender cache module is configured to cache the FLEX data stream on the sender side.
  • the slicing module is configured to sequentially split the FLEX data stream into a plurality of slice packets according to the configured slice length of the slice at the transmitting end, and insert a time-stamped packet overhead into the slice package when the slice is completed, and the packet overhead is inserted.
  • the slice packet is sent to the cell switching matrix, and the packet overhead field includes a time stamp.
  • the cell switching matrix is configured to send the received slice packet to the receiving end of the corresponding link according to the channel link.
  • the receiving end cache module is configured to buffer the received slice package at the receiving end.
  • the reassembly module is configured to parse the packet overhead before or after buffering the slice packet, obtain the time stamp of the slice packet, and obtain the path delay of the slice packet according to the time stamp of the slice packet and the time when the receiver receives the slice packet, and determine the slice packet. Whether the path delay exceeds the preset maximum line delay. If not, the packet payload is reassembled after the packet overhead of the slice packet is removed. If it exceeds, an alarm signal is sent.
  • the clock module is connected to the slicing module and the recombining module, and the clock module generates a periodic synchronizing signal and a reference clock, and simultaneously sends the synchronizing signal and the reference clock to the slicing module and the recombining module, and the slicing module and the recombining module are synchronized according to the synchronization.
  • the signal and reference clock generate a cycle time stamp. When the sync signal is valid, the time stamp starts counting from 0, and the time synchronization between the transmitter and the receiver is completed.
  • the transmitting end and the receiving end perform time synchronization through the synchronization signal, so that the time consistency between the transmitting end and the receiving end can be ensured, so that the path delay of the obtained sliced packet is more accurate and the reliability is good.
  • the system further includes a control module, configured to generate a plurality of sets of slice control signals according to the configured slice length, each set of slice control signals includes a start pulse control signal and an end pulse control signal; and the slice module is further configured to receive start pulse control The signal and the end pulse control signal, and after receiving the start pulse control signal, start reading the data stream byte by byte from the buffer module of the transmitting end, and stop receiving the data stream after receiving the end pulse control signal,
  • the data stream read between the start pulse control signal and the end pulse control signal in each group of slice control signals is taken as a slice packet, and the packet overhead field further includes a packet start field corresponding to the start pulse control signal, and the end The end of field field corresponding to the pulse control signal.
  • the system further includes a slice packet length detecting module and a processing module, and the slice packet length detecting module is configured to detect, at the receiving end, whether the length of the received slice packet is consistent with the configured slice packet length, and if not, issue an alarm signal.
  • the processing module is configured to: after receiving the alarm signal of the slice packet length detecting module, supplement the data packet content of the corresponding byte in the slice packet whose length is inconsistent, so that the length of the added slice packet is consistent with the configured slice packet length . If the configured slice packet length is 1000 bytes, the length of the slice packet received by the receiving end is 800 bytes, which is 200 bytes less than the configured slice packet length, indicating that the slice packet appears during transmission.
  • the content of the supplemental data packet can be a fixed value or a non-fixed value, and only needs to satisfy the number of bytes added to be equal to the number of lost bytes.
  • system further includes a verification module, configured to perform CRC check on the received slice packet at the receiving end before determining whether the path delay of the slice packet exceeds a preset maximum line delay, if the CRC check If an error occurs, an alarm signal is sent to ensure the robustness of the slice packet transmission.
  • a verification module configured to perform CRC check on the received slice packet at the receiving end before determining whether the path delay of the slice packet exceeds a preset maximum line delay, if the CRC check If an error occurs, an alarm signal is sent to ensure the robustness of the slice packet transmission.
  • the FlexE service-based cell switching system of the present invention performs slice processing on the FLEX data stream, divides it into a slice packet of a plurality of smaller unit cells, and inserts a packet overhead, and outputs the packet to the corresponding chain through the cell switching matrix.
  • the receiving end of the road since the number of bytes per packet is small, the time required for buffering and transmission is short, so that the path delay to the receiving end is small, and ultra-low delay cell switching is realized, and when a small slice packet is obtained When an abnormality occurs, the slice packet abnormality can be quickly detected, and the abnormal slice package can be repaired in time, thereby making the transmission of the FLEX data stream more efficient and reliable.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un procédé d'échange de cellules basé sur un service FLEXE, se rapportant au domaine des communications, le procédé comprenant les étapes suivantes consistant à : segmenter séquentiellement, au niveau d'un terminal d'envoi, un flux de codes de données FLEXE en plusieurs paquets de tranches, et insérer un surdébit de paquet avec une estampille temporelle dans le paquet de tranche; un terminal de réception mettant en mémoire cache un paquet de tranche reçu, analyser le surdébit de paquet avant ou après la mise en mémoire cache du paquet de tranche, et obtenir l'estampille temporelle du paquet de tranche, et obtenir une latence de chemin du paquet de tranche selon l'estampille temporelle du paquet de tranche et du moment où le terminal de réception a reçu le paquet de tranche, déterminer si la latence de chemin du paquet de tranche dépasse une latence de ligne maximale prédéfinie, si tel n'est pas le cas, lire le paquet de tranche, supprimer le surdébit de paquet du paquet de tranche, puis recombiner les charges utiles des paquets de tranches, et si tel est le cas, envoyer un signal d'alerte. Le procédé d'échange de cellules mettant en oeuvre une latence ultra faible sur la base d'un service FLEXE fourni par la présente invention met en mémoire cache et transfère des paquets de tranches après un traitement de tranchage, ce qui permet d'obtenir une efficacité et une fiabilité de transmission élevées.
PCT/CN2018/103426 2017-12-25 2018-08-31 Procédé et système d'échange de cellules basés sur un service flexe WO2019128287A1 (fr)

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