WO2020034966A1 - Procédé et appareil de transmission de trafic, dispositif de réseau de transport optique, et support d'informations - Google Patents

Procédé et appareil de transmission de trafic, dispositif de réseau de transport optique, et support d'informations Download PDF

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Publication number
WO2020034966A1
WO2020034966A1 PCT/CN2019/100435 CN2019100435W WO2020034966A1 WO 2020034966 A1 WO2020034966 A1 WO 2020034966A1 CN 2019100435 W CN2019100435 W CN 2019100435W WO 2020034966 A1 WO2020034966 A1 WO 2020034966A1
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service
pcs
transmitted
overhead
optical channel
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PCT/CN2019/100435
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English (en)
Chinese (zh)
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张源斌
苑岩
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中兴通讯股份有限公司
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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]
    • 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
    • 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]
    • H04J3/1664—Optical Transport Network [OTN] carrying hybrid payloads, e.g. different types of packets or carrying frames and packets in the paylaod

Definitions

  • Embodiments of the present invention relate to, but are not limited to, the field of communication technologies, and in particular, to a service transmission method and device, an optical transmission network device, and a storage medium.
  • OTN Optical Transport Network
  • ITU-T International Telecommunication Union
  • the required mapping level is that the Ethernet service is first mapped to the low-order optical channel data unit ODUk, and the low-order optical channel data unit ODUk is then mapped to the high-order optical channel data unit.
  • ODUk and each mapping will add 1/239 of the overhead ratio, which eventually results in the corresponding OTN interface speed being higher than the Ethernet speed.
  • a corresponding dual-rate optical module must be developed for the OTN interface.
  • the OTN structures defined in related technologies are byte-based, and Ethernet services are based on physical coding sublayer (PCS) coding blocks (such as 66b). Ethernet services are directed to the optical channel data unit ODUk. When mapping, 66b and byte are not very matched. At the same time, the byte-based optical channel data unit ODUk structure is also inconvenient for Ethernet-like encoding conversion to adapt to the forward error correction code FEC and perform speed reduction processing.
  • PCS physical coding sublayer
  • a service transmission method and device, an optical transmission network device, and a storage medium provided by the embodiments of the present invention.
  • the main technical problems to be solved are: the implementation of the Optical Network Terminal (ONT) transmission service is too complicated, power consumption and efficiency Poor technical issues.
  • ONT Optical Network Terminal
  • An embodiment of the present invention provides a service transmission method, including:
  • the service to be transmitted is mapped into an optical channel data unit, where the optical channel data unit includes the payloads of M PCS code blocks and the overhead of N PCS code blocks; where N and M are positive integers greater than or equal to 1 and M Greater than N
  • An embodiment of the present invention further provides a service transmission apparatus, including:
  • a mapping module configured to map a service to be transmitted to an optical channel data unit, where the optical channel data unit includes a payload of M PCS code blocks and an overhead of N PCS code blocks, where N and M are greater than or equal to 1 A positive integer and M is greater than N;
  • the sending module is configured to send the optical channel data unit to which the service to be transmitted is mapped through a transmission interface.
  • An embodiment of the present invention further provides an optical transmission network device, where the optical transmission network device includes a processor, a memory, and a communication bus;
  • the communication bus is used to implement connection and communication between the processor and the memory
  • the processor is configured to execute one or more programs stored in the memory to implement the steps of the service transmission method as described above.
  • An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores one or more computer programs, and the one or more computer programs can be executed by one or more processors to Steps for implementing the service transmission method as described above.
  • the optical channel data unit includes the payloads and N of M PCS code blocks.
  • the cost of each PCS coding block is finally sent through the transmission interface to the optical channel data unit, that is, the optical channel data unit is obtained by mapping.
  • the payload and overhead are specifically mapped through the M / N ratio relationship.
  • a new optical channel data unit is obtained through the mapping method, and the structure is designed according to the transmission needs of the customer's business. Based on this structure, the hardware implementation of the optical transmission network equipment is more simple and convenient. Perform transcoding processing of various types of services, so as to achieve high-speed compression service processing efficiency and transmission efficiency, at the same time reduce the transmission power consumption of the device, and reduce the development cost of the device.
  • FIG. 1 is a schematic flowchart of a service transmission method according to Embodiment 1 of the present application
  • FIG. 2 is another schematic flowchart of a service transmission method according to Embodiment 2 of the present application.
  • FIG. 3 is a schematic structural diagram of a service transmission apparatus according to Embodiment 3 of the present application.
  • FIG. 4 is another schematic structural diagram of a service transmission apparatus according to Embodiment 3 of the present application.
  • FIG. 5 is a first schematic structural diagram of an ODUk according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a second structure of an ODUk according to an embodiment of the present application.
  • FIG. 7 is a third schematic structural diagram of an ODUk according to an embodiment of the present application.
  • FIG. 8 is a fourth schematic structural diagram of an ODUk according to an embodiment of the present application.
  • FIG. 9 is a fifth schematic structural diagram of an ODUk according to an embodiment of the present application.
  • FIG. 10 is a sixth schematic structural diagram of an ODUk according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a scenario before 5G according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of an optical transmission network device provided in Embodiment 4 of the present application.
  • low-speed ODUi (i ⁇ k) signals represent ODUi signals at a lower rate than ODUk signals; non-OTN signals refer to various signals other than transmission network signals, such as Synchronous Digital Hierarchy (SDH) signals, Ethernet signals, and mesh channels (Fibre channel) signals, various packet signals, etc.
  • SDH Synchronous Digital Hierarchy
  • Ethernet Ethernet signals
  • mesh channels Fibre channel
  • the signal of the optical transmission network includes two parts of overhead and payload.
  • OTUk Optical Conversion Channel
  • the OTUk signal consists of OTUk.
  • the remaining part of the OTUk after removing the OTUk overhead is called the optical channel data unit ODUk.
  • the remaining part of the ODUk after removing the ODUk overhead is called the optical channel payload unit OPUk.
  • the OPUk is the remaining part after removing the OPUk overhead. It is called OPUk payload.
  • OPUk payload can be used to load a non-OTN signal or multiple low-speed ODUi (i ⁇ k) signals.
  • a signal consisting of ODUk is called an ODUk signal.
  • the size, number, and proportion of the overhead parts inserted between the payloads are all relatively fixed, which results in the final transmission rate of ODUk being greater than
  • the speed required by the service itself does not match the speed requirements of the actual optical transport network equipment.
  • an embodiment of the present invention provides a service transmission Method, which calculates and inserts the overhead part inserted during ODUk mapping according to the actual needs of the service, that is, inserts according to the proportion of the overhead part corresponding to the actual needs of the service to be transmitted, thereby realizing the mapping conversion of the service.
  • the service transmission method provided in the embodiment of the present invention is shown in FIG. 1.
  • the service transmission method provided in this embodiment is mainly applied to the customer service conversion of the OTN equipment of the optical transmission network. Specifically, the method includes:
  • S101 Map a service to be transmitted to an optical channel data unit.
  • the service to be transmitted refers to a data stream format service based on a PCS code block, that is, when the initial format of the service is not a PCS code block, this needs to pass
  • the data stream of the PCS code block is obtained after conversion.
  • the initial format of the service is the PCS code block
  • the service to be transmitted is the original service.
  • the PCS code block includes at least one of 8b / 10b and 64b / 66b.
  • the PCS coding block may also be other combinations, and is not limited to the above 8b / 10b, 64b / 66b, that is, the coding block that realizes coding through a physical coding sublayer may be used.
  • the optical channel data unit ODUk mapped in this embodiment is not an ODUk structure in the related art.
  • the optical channel data unit includes the payload of M PCS code blocks and the overhead of N PCS code blocks.
  • the payloads of the M PCS coded blocks and the overhead of the N PCS coded blocks can also be understood as the overhead of a total of P * M PCS coded blocks and the P * N PCS coded blocks, where P * The overhead of the N PCS coding blocks increases in a relationship of M / N according to the payload and the overhead.
  • the M / N refers to the ratio of the payload to the overhead. The ratio can be specifically set according to the actual needs of the service to be transmitted. Among them, P, N, and M are positive integers greater than or equal to 1 and M is greater than N.
  • S102 Send the optical channel data unit to which the service to be transmitted is mapped through a transmission interface.
  • mapping ODUk in addition to mapping ODUk according to the needs of the service corresponding to the service type, it can also be mapped after comprehensive consideration according to the needs of the service and the transmission requirements of the transmission interface.
  • the transmission interface here refers to the optical transport network. ONT interface on the device.
  • the process of mapping the service to be transmitted to the optical channel data unit is specifically by storing the service to be transmitted in the payload of the optical channel data unit, and after the mapping,
  • the overhead is inserted between the payloads, and the overhead is used to manage and maintain the optical channel data unit.
  • the overhead is used to manage or maintain the payload to be transmitted.
  • step S102 the specific steps for implementing step S102 include:
  • the ratio of the payload to the overhead is determined according to the actual demand of the service, and the total size of the overhead to be inserted into the optical channel data unit is calculated.
  • the total size of the overhead includes several overheads, that is, the overhead part is composed of at least one overhead, that is, it is composed of at least one PCS code block, and the insertion overhead is also inserted into the PCS code block, thereby adjusting the optical channel.
  • the occupation of the payload and overhead of the data unit so as to obtain a new ODUk for transmitting customer services.
  • This ODUk can reduce the requirements and power consumption of hardware equipment, so that when the corresponding equipment is developed, there is no need to Considering the problem of incompatible transmission of customer types, reducing development costs.
  • the client service based on the PCS code block is first mapped to a low-level optical channel payload unit, and then the overhead is inserted through the related technology to convert it into a relatively high-level optical channel net. Load unit, and finally map the advanced optical channel payload unit to ODUk.
  • step S101 before step S101, it further includes: determining whether the service to be transmitted is a data stream format based on a PCS code block, that is, determining whether the service type meets the PCS code block; if the service to be transmitted If the data stream format is not based on the PCS code block, the data stream format of the service to be transmitted is converted into the data stream format based on the PCS code block.
  • the service to be transmitted is a data stream format based on a PCS code block
  • the data stream format of the service to be transmitted remains unchanged
  • the services to be transmitted may include multiple types, such as Ethernet-type services, non-Ethernet services based on PCS code blocks, and even other types of customer services.
  • the purpose of determining the service type in this step is to facilitate the subsequent steps to be compatible and compatible with the conversion of ODUk, because different customer services (that is, services to be transmitted) have different requirements for transmission requirements, and some need to be transmitted. Fast, some need slower transmission.
  • the conversion in this step is specifically converting various customer services into a data stream based on the PCS coding block, and step S101 is performed based on the converted data stream.
  • mapping is performed through a determined ratio of payload to overhead, and the overhead of N PCS coded blocks is inserted according to the payload of every M PCS coded block, so as to obtain a frame that meets the service transmission requirements structure.
  • step S102 the increasing in an M / N relationship according to the payload and the overhead includes: continuously storing the overhead of the N PCS coded blocks in the payload of the M PCS coded blocks.
  • the overhead of the N PCS coded blocks is discontinuously stored among the payloads of the M PCS coded blocks.
  • discontinuous storage of the overhead of the N PCS coded blocks among the payloads of the M PCS coded blocks includes: storing the overhead of the N PCS coded blocks evenly in the M PCS coded blocks. Between the payloads.
  • continuity should be understood as the overhead of N PCS coded blocks is all inserted at a certain position between the payloads of the M PCS coded blocks; discontinuity should refer to the cost of N PCS coded blocks
  • the irregular or regular way is inserted between the payloads of the M coded blocks, and the average insertion (that is, the regular way) means that the overhead of the N PCS coded blocks is evenly distributed among the payloads of the M PCS coded blocks.
  • the average here can be an even distribution at the positions of the M PCS coded blocks, or an even distribution of the number of groups that are regrouped into N PCS coded blocks; and inserting the overhead in an irregular manner means that the N PCSs are
  • the overhead of coding blocks is irregularly divided among the payloads of M PCS coding blocks.
  • the converting the to-be-transmitted service into a data stream format based on a PCS code block includes: performing serial processing conversion on the Ethernet-type service Into a data stream based on a specific PCS coded block format, the series of processing includes at least one of data head AM alignment, de-forward error correction code FEC, and descrambling.
  • a series of processing (AM alignment, FEC, descrambling, etc.) is first restored to a data stream based on a specific PCS coding block format (such as 66b / 257b, etc.), and then the overhead is inserted according to step S102 to implement ODUk Conversion.
  • a series of processing AM alignment, FEC, descrambling, etc.
  • a specific PCS coding block format such as 66b / 257b, etc.
  • the converting the to-be-transmitted service to a data stream format based on a PCS code block includes: converting the non-Ethernet service to a PCS code block format,
  • the PCS coding block format is a format corresponding to the PCS coding block specified in the optical channel data unit ODUk.
  • step S102 first perform code conversion (such as 8b / 10b to 64b / 66b conversion), and have the same PCS code block format as the new ODU structure, and then perform overhead insertion according to step S102 to implement ODUk mapping.
  • code conversion such as 8b / 10b to 64b / 66b conversion
  • the step of mapping the converted service to be transmitted to an optical channel data unit further includes: deleting or adding data
  • the speed of the data stream transmitted by the to-be-transmitted service is adjusted in a manner of packet spacing IPG or partial control characters between the streams.
  • whether or not to perform speed adjustment processing can be selected according to actual needs. If the customer's business does not need to perform speed adjustment, it is not necessary to delete the packet spacing during the steps S101-S102. If it is When speed adjustment is required, before performing the step of mapping the converted service to be transmitted to the optical channel data unit, the packet space IPG in the data stream is deleted or the data is converted. Part of the control characters in the stream are controlled to achieve the operation of speed adjustment. Finally, the speed-adjusted service can be mapped into ODUk.
  • mapping ODUk according to the overhead of inserting a fixed number of N PCS code blocks every fixed number of PCS code blocks, if the service optical channel payload unit includes p * M PCS code blocks , The overhead of p * N PCS coding blocks should be inserted to form a new type of optical channel data unit ODUk.
  • the size of the payload area of the new ODUk (that is, the above-mentioned optical channel data unit ODUk) is p * M, the size of the overhead area is p * N, and the overhead ratio is N / (M + N).
  • the determination of the ratio of N and M is related to the rate of customer services. For higher-speed customer services, a lower overhead insertion ratio can be selected. For lower-speed customer services, the overhead insertion ratio is higher. The determination of this ratio is It is calculated according to the actual needs of the business.
  • the main purpose is to allow enough new ODUs to perform alarm detection within a fixed time, so that protection switching can be performed within a specified time, and the rate of the new ODUk can meet the customer's business rate requirements. . For example, within 3ms, 30 new ODUk are needed. This can be used to determine whether there are LOF (Loss Of Frame, Lost) alarms. LOF alarms will cause protection switching, and protection switching requires time.
  • LOF
  • the overhead of the N PCS-based coded blocks may be continuous or discontinuous among the payloads of the M PCS-coded blocks.
  • the overhead of N PCS coded blocks is stored on average among the payloads of M PCS coded blocks.
  • the ODUk structure can be set in the form of a row and column structure, or it can be set in the form of a data stream structure.
  • the row and column structure is set and the overhead part is inserted by continuous insertion, as shown in Figures 5 and 6
  • Figure 7 and Figure 8 when the data stream structure is set and the overhead is inserted using discontinuous insertion.
  • the ODUk obtained through the service transmission method provided in this embodiment is a brand-new ODUk structure.
  • the ODUk structure is designed based on the Ethernet PCS coding block, and the fixed-cycle insertion is based on the ODU overhead of the PCS coding block.
  • the ODU structure has a complete OAM function.
  • the OAM function refers to Operation, Administration, Maintenance, or OAM for short.
  • the structural design based on the Ethernet PCS coding block makes hardware implementation simpler, and It is also convenient to perform various types of transcoding processing to achieve the purpose of compression rate, and at the same time reduce the transmission power consumption of the device.
  • FIG. 11 is a schematic diagram of a 5G fronthaul scenario.
  • the interfaces of 5G wireless devices and OTN devices are general public Ethernet-based Radio interface (Common Public Radio Interface, eCPRI), each base station has three eCPRI interfaces, and each eCPRI interface has a bandwidth of 25GE.
  • eCPRI Common Public Radio Interface
  • each base station has three eCPRI interfaces
  • each eCPRI interface has a bandwidth of 25GE.
  • the following describes the specific steps for mapping 25GE eCPRI to the new ODUk (the above-mentioned ODUk):
  • the OTN device obtains a 25GE Ethernet data stream from the interface with the wireless device, frames the 25GE Ethernet data stream, removes FEC, and CWM, and restores the data stream based on the 66b block.
  • S202 Perform speed adjustment processing on the 66b block-based data stream by deleting the packet gap IPG or a part of the control block stream.
  • the ratio of the overhead part to the payload part is determined according to the transmission rate requirement of the 25GE Ethernet data stream, and the number of inserted overhead parts is determined according to the proportion. For example, two 66b blocks are inserted every 476 66b blocks.
  • the two 66b block overheads are evenly distributed among them, or they can be inserted consecutively in 478 66b blocks. in.
  • the overhead part that needs to be inserted is 4 * 2 66b block overheads.
  • S205 Map the new ODUk to the interface of the OTN equipment line port, and send it out through the line port.
  • S206 The receiving end de-maps from the interface frame to recover a new ODUk, frames the new ODUk by overhead, processes the corresponding monitoring and maintenance information, and deletes the overhead.
  • S207 Perform processing such as FEC encoding of the 66b data stream with deletion overhead and CWM insertion to restore the original client service.
  • each base station outputs 3 CPRI7 interfaces, and when the bandwidth of each CPRI7 interface is about 10G, the 10G CPRI7 to the new
  • the specific steps of ODUk mapping are as follows:
  • Step 1 The OTN device obtains a 10G data stream based on 8b / 10b encoding from the interface with the wireless device, and performs 8b / 10b to 64b / 66b encoding conversion on the data stream to form a 66b block-based data stream.
  • step 2 the overhead of two 66b blocks is inserted every 952 66b blocks, that is, the ratio of the payload of the ODUk to the ODUk is 476/477, and the overhead of the two 66b blocks is continuously stored.
  • Step 3 According to the method in step 2, after inserting 4 * 2 66b block overheads, a new ODUk is formed. ODUk is based on 66b blocks and uses 1 * 3816 representation mode, as shown in Figure 10 (data stream structure)
  • Step 4. Map the new ODUk to the interface of the OTN equipment line port and send it out through the line port.
  • Step 5 The receiving end de-maps the interface to recover a new ODUk, frames the new ODUk with overhead, processes the corresponding monitoring and maintenance information, and deletes the overhead.
  • step 6 the deleted overhead 66b data stream is processed from 64b / 66b to 8b / 10b to restore the original customer service.
  • the specific implementation steps for the mapping of the STM-64 service to the new ODUk are as follows
  • Step 11 The OTN device obtains the STM-64 data stream from the interface with the dedicated line device, and uses the method of adding a 2-bit synchronization header every 8 bytes to the STM-64 data stream to form a 66b block-based data stream.
  • step 12 two 66b block overheads are inserted every 476 66b blocks, that is, the ratio of the payload of the ODUk to the ODUk is 238/239, and the two 66b block overheads are continuously stored.
  • Step 13 According to the method of step 12, after inserting 2 * 2 66b block overheads, a new ODU is formed, and ODUk adopts the 2 * 478 representation mode.
  • Step 14 Map the new ODUk to the interface of the OTN equipment line port and send it out through the line port.
  • Step 15 The receiving end de-maps the interface to recover a new ODU, frames the new ODUk by overhead, processes the corresponding monitoring and maintenance information, and deletes the overhead.
  • step 16 the 66b data stream with the deleted overhead is processed from 66b to 64b to restore the original client service.
  • the specific steps for mapping the STM-64 service to the new ODUk are as follows:
  • Step 21 The OTN device obtains the STM-64 data stream from the interface with the dedicated line device, and maps the STM-64 service to the ODU2 in a traditional manner.
  • Step 22 Perform byte-to-66b block-based code conversion on ODU2, that is, add a 2-bit synchronization header every 8 bytes to form a new ODUk.
  • Step 23 Map the new ODUk to the interface frame of the OTN equipment line port, and send it out through the line port.
  • Step 24 The receiver demaps the interface to recover a new ODUk, frames the new ODUk with overhead and processes the corresponding monitoring and maintenance information, and then transcodes to the traditional byte-based ODU.
  • Step 25 Demapping the customer service from the traditional ODUk.
  • the 10GE service does not land until the far end, that is, the OTN device at the opposite end needs to perform ODU cross processing.
  • the new ODUk mapping steps are as follows:
  • step 31 the OTN device obtains the 10GE Ethernet data stream from the interface with the dedicated line device and maps it to the ODU2e according to the traditional mapping method.
  • step 32 a 2-bit synchronization header is added to the ODU2e every 8 bytes to form a new ODUk based on a 66b block.
  • Step 33 Map the new ODUk to the interface frame of the OTN equipment line port, and send it out through the line port.
  • Step 34 The receiving end de-maps the interface frame to recover a new ODUk, determines the new ODUk by the overhead, and performs a 66b to 64b transcoding to restore the original ODU2e after the frame is fixed.
  • Step 35 The original ODU2e is cross-processed and sent to a further location.
  • the service transmission method provided in this embodiment obtains a new optical channel data unit through the foregoing service transmission method conversion, and the frame structure is designed according to the transmission rate required by the customer service. Based on such a frame structure, When designing the optical transmission network equipment, the hardware implementation is simpler, and it is also convenient for transcoding processing of various types of services, so as to achieve high-speed compression service processing efficiency and transmission efficiency, and also reduce the transmission power consumption of the equipment. Reduced equipment development costs.
  • This embodiment provides a service transmission device.
  • the device can be applied to various optical transport network devices.
  • the device includes: a mapping module 301 and a sending module 302, where the mapping module 301 is used for
  • the service to be transmitted is mapped into an optical channel data unit, where the optical channel data unit includes the payloads of M physical coding sublayer PCS coding blocks and the overhead of N PCS coding blocks, where N and M are greater than or equal to 1.
  • N and M are greater than or equal to 1.
  • a positive integer and M is greater than N.
  • the to-be-transmitted service refers to a service based on the data stream format of the PCS code block, that is, when the initial format of the service is not the PCS code block, which requires conversion to obtain the data stream of the PCS code block.
  • the service to be transmitted is the original service.
  • the PCS coding block includes at least one of 8b / 10b and 64b / 66b. In practical applications, the PCS coding block may also be another combination. , Not limited to the above 8b / 10b, 64b / 66b, that is to say, the encoding block that can be encoded through the physical encoding sublayer can be
  • the payload of the M PCS coded blocks and the overhead of the N PCS coded blocks can also be understood as the overhead of a total of P * M PCS coded blocks and the P * N PCS coded blocks.
  • P, N, and M are positive integers greater than or equal to 1 and M is greater than N;
  • the optical channel data unit herein should be understood as a new optical channel data unit ODUk obtained through the service transmission method provided by the embodiment of the present invention, Not ODUk in related technology.
  • the sending module 302 is configured to send the optical channel data unit obtained by the conversion module 301 through a transmission interface.
  • the device further includes a judgment module 303 and a conversion module 304.
  • the functions of the two modules are mainly used to determine whether the service to be transmitted meets the conditions, and if not, the service to be transmitted is converted into The data stream format based on the PCS code block, and when it is satisfied, the original format data can be used directly; the service to be transmitted here can be an Ethernet type service or a non-Ethernet service based on the PCS code block, or even other Customer business type and more.
  • the determination module 303 is configured to determine whether the service to be transmitted is a data stream format based on a PCS code block, that is, to determine whether the service type meets the PCS code block; the conversion module 304 is used to determine if the service to be transmitted is not Based on the data stream format of the PCS code block, the data stream format of the service to be transmitted is converted into the data stream format of the PCS code block; if the service to be transmitted is the data stream format of the PCS code block, the The data stream format of the service to be transmitted is unchanged.
  • the manner in which the mapping module 301 sets the payload and the overhead in a relationship of M / N according to the payload and the overhead specifically includes: continuously storing the overhead of the N PCS coded blocks in the M Between the payloads of the PCS encoding blocks; or, the overhead of the N PCS encoding blocks is discontinuously stored among the payloads of the M PCS encoding blocks.
  • the mapping module 301 determines the ratio of the payload to the overhead according to the actual demand of the service, and calculates the total size of the overhead to be inserted into the optical channel data unit.
  • the total size of the overhead includes several overheads, that is, the overhead part is composed of at least one overhead, that is, it is composed of at least one PCS code block, and the insertion overhead is also inserted into the PCS code block, thereby adjusting the optical channel.
  • the occupation of the payload and overhead of the data unit so as to obtain a new ODUk for transmitting customer services.
  • This ODUk can reduce the requirements and power consumption of hardware equipment, so that when the corresponding equipment is developed, there is no need to Considering the problem of incompatible transmission of customer types, reducing development costs.
  • the conversion module 304 is further configured to perform a series of processing to convert the Ethernet type service into a data stream based on a specific PCS coding block format.
  • the series of processing includes at least one of data head AM alignment, de-forward error correction code FEC, and descrambling.
  • the mapping module 301 when mapping the optical channel data unit, specifically stores the to-be-transmitted service into a payload of the optical channel data unit, and inserts the overhead to the optical channel data unit.
  • the optical channel data unit is managed and maintained.
  • the speed can also be selected according to actual needs, specifically by deleting or adding data
  • the speed of the data stream transmitted by the to-be-transmitted service is adjusted in a manner of packet spacing IPG or partial control characters between the streams.
  • the conversion module 304 is further configured to convert the non-Ethernet service into a PCS code block format, and the PCS code block format is the optical The format corresponding to the PCS code block specified in the channel data unit.
  • the service transmission device maps the converted service to be transmitted to an optical channel data unit by converting the service to be transmitted into a data stream format based on the PCS code block, where the optical channel data unit includes P times M
  • the payload of each PCS coded block and P are multiplied by the cost of N PCS coded blocks, and the cost of P times the N PCS coded blocks is increased according to the payload and the cost in the relationship of M / N.
  • optical channel data will be obtained The unit is sent out through the transmission interface.
  • the ODUk structure is designed based on the Ethernet PCS code block, and the fixed-cycle insertion is based on the ODU overhead of the PCS code block.
  • the ODU structure has a complete OAM function.
  • the OAM function refers to Operation, Administration, Maintenance, or OAM for short.
  • the structural design based on the Ethernet PCS coding block makes hardware implementation simpler, and It is also convenient to perform various types of transcoding processing to achieve the purpose of compression rate, and at the same time reduce the transmission power consumption of the device.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • This embodiment provides an optical transmission network device.
  • a processor 401 a memory 402, and a communication bus 403.
  • the communication bus 403 is used to implement a communication connection between the processor 401 and the memory 402.
  • the processor 401 It is configured to execute one or more programs stored in the memory 402 to implement the following steps: mapping a service to be transmitted into an optical channel data unit, where the optical channel data unit includes a payload of M PCS coding blocks and N PCS The overhead of the coding block; where N and M are positive integers greater than or equal to 1 and M is greater than N, the coding block includes at least one of 8b / 10b and 64b / 66b.
  • the PCS coding block It may also be another combination; the optical channel data unit to which the service to be transmitted is mapped is sent through a transmission interface.
  • the payloads of the M PCS coded blocks and the overhead of the N PCS coded blocks are combined in at least one of the following ways:
  • the overhead of the N PCS coding blocks may be stored evenly among the payloads of the M PCS coding blocks.
  • the processor 401 before executing the step of mapping the service to be transmitted to the optical channel data unit, the processor 401 further includes performing the following steps:
  • Determining whether the service to be transmitted is a data stream format based on the PCS code block, that is, determining whether the type of the service meets the data stream format of the PCS code block;
  • the data stream format of the service to be transmitted is converted into a data stream format based on the PCS code block.
  • the service to be transmitted is a data stream format based on a PCS code block, then the data stream format of the service to be transmitted remains unchanged.
  • the step of mapping the service to be transmitted to the optical channel data unit is specifically implemented by: storing the service to be transmitted into the payload space of the optical channel data unit, and inserting the overhead to the The optical channel data unit is managed and maintained.
  • the processor 401 when the processor 401 executes a program to implement a function of mapping a service to be transmitted into the optical channel data unit in a relationship of M / N according to a payload and an overhead, the processor 401 may specifically implement the following steps:
  • the ratio of the payload to the overhead is determined according to the actual demand of the service, and the total size of the overhead to be inserted into the optical channel data unit is calculated.
  • the total size of the overhead includes several overheads, that is, the overhead part is composed of at least one overhead, that is, it is composed of at least one PCS code block, and the insertion overhead is also inserted into the PCS code block, thereby adjusting the optical channel.
  • the occupation of the payload and overhead of the data unit so as to obtain a new ODUk for transmitting customer services.
  • This ODUk can reduce the requirements and power consumption of hardware equipment, so that when the corresponding equipment is developed, there is no need to Considering the problem of incompatible transmission of customer types, reducing development costs.
  • the size of the payload area of the new ODUk is p * M
  • the size of the overhead area is p * N
  • the overhead ratio is N / (M + N).
  • N and M are positive integers of 1 or more and M is greater than N
  • p is a positive integer of 1 or more.
  • the determination of the ratio of N and M is related to the customer service rate. For higher-speed client services, a lower overhead insertion ratio can be selected. For lower-speed client services, the overhead insertion ratio is higher.
  • the main purpose is to fix the Within a period of time, there can be enough new ODUs to perform alarm detection in order to perform protection switching within a specified time. For example, within 3ms, 30 new ODUs are needed. This can be used to determine whether there are LOF (Loss Of Frame) alarms. LOF alarms will cause protection switching, and protection switching requires time.
  • LOF Loss Of Frame
  • the overhead of N PCS-based coding blocks may be continuous or discontinuous among the payloads of M PCS-based coding blocks.
  • the overhead of N PCS-based coded blocks is stored on average among the payloads of M PCS-based coded blocks, as shown in Figure 5-8.
  • the service to be transmitted is an Ethernet type service
  • before converting the optical channel payload unit to which the service to be transmitted is mapped into the optical channel data unit according to the transmission rate
  • a series of processing is restored to a data stream based on a specific PCS coded block format (such as 66b / 257b, etc.).
  • a specific PCS coded block format such as 66b / 257b, etc.
  • the overheads can be stored continuously or discontinuously in ODUk. That is, N overheads are distributed among M PCS coding blocks.
  • a new ODUk structure is formed.
  • the ODUk structure can be in the form of a data stream. Representation can also take the form of a row and column structure.
  • the optical channel payload unit to which the to-be-transmitted service is mapped is converted into the optical unit according to the transmission rate.
  • the method further includes: converting the non-Ethernet service to a PCS code block format, where the PCS code block format is a format corresponding to the PCS code block specified in the optical channel data unit.
  • the ODUk structure can be expressed in the form of a data stream or in the form of a row and column structure.
  • the services to be transmitted may also be service types of other formats, as for processing of other service types.
  • the specific steps are:
  • the client service is first transcoded to form a data stream based on the PCS code block, and then every N PCS code blocks are used to insert N PCS code block overhead-based proportional relationships.
  • the overhead is inserted for M in the ODU payload.
  • the N overheads inserted by the PCS code blocks can be stored continuously or discontinuously in the ODUk. That is, the N overheads are distributed among the M PCS code blocks.
  • a new ODUk structure is formed.
  • the ODUk Structures can be expressed in the form of data streams or in the form of row and column structures.
  • the ODUk is based on the byte format, and then the traditional ODUk is transcoded based on the PCS code block (for example, multiple bytes are added to the synchronization header and other operations) to form New ODUk structure.
  • ODUk-based interworking and ODUk carrying Ethernet services although ODUk payloads carry Ethernet data streams based on PCS code blocks (such as 66b blocks), the PCS codes based on ODUk payloads are not recognized.
  • the block data flow that is, the service is mapped to the traditional byte-based ODUk in the traditional way, and then the traditional ODUk is transcoded based on the PCS code block (for example, multiple bytes are added consecutively to synchronize the header etc.) to form a new ODUk structure.
  • an embodiment of the present invention further provides a computer-readable storage medium.
  • the computer-readable storage medium includes any computer-readable storage medium for storing information such as computer-readable instructions, data structures, computer program modules, or other data. Volatile or non-volatile, removable or non-removable media implemented in a method or technology.
  • Computer-readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory, Read-Only Memory), EEPROM (Electrically Erasable, Programmable, Read-Only Memory, and Erasable Programmable Read-Only Memory) ), Flash memory or other memory technology, CD-ROM (Compact Disc Read-Only Memory), digital versatile disk (DVD) or other optical disk storage, magnetic box, magnetic tape, disk storage or other magnetic storage devices, Or any other medium that can be used to store desired information and can be accessed by a computer.
  • RAM Random Access Memory
  • ROM Read-Only Memory
  • Read-Only Memory Read-Only Memory
  • EEPROM Electrically Erasable, Programmable, Read-Only Memory, and Erasable Programmable Read-Only Memory
  • Flash memory or other memory technology
  • CD-ROM Compact Disc Read-Only Memory
  • DVD digital versatile disk
  • the computer-readable storage medium in this embodiment may be used to store one or more computer programs, and the stored one or more computer programs may be executed by a processor to implement service transmission as in the first embodiment or the second embodiment. At least one step of the method.
  • This embodiment also provides a computer program, which may be distributed on a computer-readable medium and executed by a computable device to implement at least one step of the service transmission method in the first or second embodiment, and In some cases, at least one of the steps shown or described may be performed in a different order than that described in the above embodiments.
  • This embodiment also provides a computer program product, including a computer-readable device.
  • the computer-readable device stores a computer program as shown above.
  • the computer-readable device may include a computer-readable device as shown above. Read storage media.
  • the service transmission method and device provide optical transmission network equipment and storage media to convert a service to be transmitted into a data stream format based on a PCS code block, and map the converted service to be transmitted to an optical channel.
  • the optical channel data unit includes P times the payload of M PCS coded blocks and P times the cost of N PCS coded blocks, and the cost of P times the N PCS coded blocks is based on the payload and overhead. Increase in the relationship of M / N.
  • the optical channel data unit will be sent out through the transmission interface. A new optical channel data unit will be obtained by this mapping method, and this structure is designed according to the transmission needs of the customer's business needs.
  • the hardware implementation when designing the optical transmission network equipment is simpler, and it is also convenient for transcoding processing of various types of services, thereby achieving high-speed compression service processing efficiency and transmission efficiency, and also reducing The transmission power consumption of the device reduces the development cost of the device.
  • a communication medium typically contains computer-readable instructions, data structures, computer program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium. Therefore, the present invention is not limited to any specific combination of hardware and software.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Certains modes de réalisation de la présente invention concernent un procédé et un appareil de transmission de trafic, un dispositif de réseau de transport optique et un support d'informations. Le procédé de transmission de trafic consiste : à mapper un trafic destiné à être transmis à une unité de données de canal optique, l'unité de données de canal optique comprenant la charge utile de M blocs de codage PCS et les surdébits de N blocs de codage PCS ; et à envoyer l'unité de données de canal optique mappée avec le trafic destinée à être transmis au moyen d'une interface de transmission.
PCT/CN2019/100435 2018-08-13 2019-08-13 Procédé et appareil de transmission de trafic, dispositif de réseau de transport optique, et support d'informations WO2020034966A1 (fr)

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