WO2023134508A1 - Procédé, appareil et système de traitement de service dans un réseau de transport optique - Google Patents

Procédé, appareil et système de traitement de service dans un réseau de transport optique Download PDF

Info

Publication number
WO2023134508A1
WO2023134508A1 PCT/CN2023/070332 CN2023070332W WO2023134508A1 WO 2023134508 A1 WO2023134508 A1 WO 2023134508A1 CN 2023070332 W CN2023070332 W CN 2023070332W WO 2023134508 A1 WO2023134508 A1 WO 2023134508A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
otn
osu
payload
payload blocks
Prior art date
Application number
PCT/CN2023/070332
Other languages
English (en)
Chinese (zh)
Inventor
维瑟斯马腾
苏伟
刘翔
Original Assignee
华为技术有限公司
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
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023134508A1 publication Critical patent/WO2023134508A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems

Definitions

  • the present application relates to the technical field of optical communication, in particular to the service processing technology in the optical transport network.
  • the optical transport network includes optical bearer containers of various rates.
  • the optical data unit 0 (ODU0) frame is the bearer container with the lowest rate in the current OTN technology, and its rate is about 1.25 gigabit per second (Gbps), which is used to carry 1Gbps Ethernet business data.
  • Gbps gigabit per second
  • the optical bearer container of the current OTN adopts time division multiplexing technology. Specifically, a high-rate bearer container is divided into multiple fixed time slots to implement multi-service bearer.
  • OTN supports two granularities of 1.25G time slot and 5G time slot. For services below 1Gbps, the time slot granularity of the current OTN bearer container cannot provide an effective bearer solution.
  • the current practice is to divide the payload area of the OTN bearer container into multiple payload blocks and define a new low-rate frame.
  • low-rate service data is carried.
  • the current mainstream method of mapping the low-rate frame to the payload block is that when the OTN device receives the service data, it allocates the required payload block for the service data and transmits it through the OTN frame.
  • each payload block carries indication information that can uniquely identify the service data.
  • the device receiving the OTN frame cannot determine the service data carried by the OSU frame, resulting in partial loss of the corresponding service data, which reduces the reliability of the OTN network.
  • the embodiments of the present application provide a method, device and system for processing service data in an optical transport network.
  • the embodiment of the present application provides a service processing method in an optical transport network (OTN).
  • the method includes several steps. First, the first OTN device acquires service data. Then, the first OTN device maps the service data into an optical service unit (OSU) frame, the OSU frame includes an overhead part and a payload part, the overhead part is used to carry overhead information, and the payload part uses to bear the business data. Next, the first OTN device maps the OSU frame into a plurality of payload blocks of the OTN frame, and the interval between two adjacent payload blocks of the plurality of payload blocks satisfies a preset interval constraint; finally, The first OTN device sends the OTN frame to the second OTN device.
  • OSU optical service unit
  • the service processing solution disclosed in this application reduces the risk of service loss.
  • the method simplifies the processing and management of the frame map and reduces the complexity of the device.
  • the OSU frame is mapped to multiple payload blocks of the OTN frame, and the interval between two adjacent payload blocks of the multiple payload blocks satisfies a preset Interval constraints, consisting of two steps. First, determine the location information of the plurality of payload blocks carrying the OSU frame according to the pre-set interval constraint; second, map the OSU frame to the OTN frame corresponding to the location information in the plurality of payload blocks.
  • the method further includes the first OTN device sending the location information to the second OTN device.
  • the location information may be sent in any of the following ways: placing the location information in the payload block of the OTN frame to send to the OTN device; placing the location information in the OTN The overhead area of the frame is sent to the OTN device; or, the location information is sent to a network management system, so that the network management system transmits the location information to the OTN device.
  • interval constraints can be implemented in various manners.
  • the spacing constraint is a fixed number of payload blocks.
  • the fixed number is an integer value of P/C, where P is the number of payload blocks included in one multiplexing period of the OTN frame, and C is the number of payload blocks occupied by the OSU frame.
  • the interval constraint is a payload block containing a range of values.
  • the numerical range is (rounded value of (P/C)*(1-50%), rounded value of (P/C)*(1+50%)), or ((P/C )*(1-520%) rounded value, (P/C)*(1+20%) rounded value).
  • the interval constraint includes an average data block interval value A and a maximum data block interval deviation value T, wherein the interval between two adjacent payload blocks among the plurality of payload blocks falls within Within (A-T, A+T).
  • the method further includes: the first device determines that the payload block corresponding to the service data is changed from the multiple payload blocks to multiple other payload blocks; then, the first device Mapping a plurality of other OSU frames to which the service data is mapped into the plurality of other payload blocks, where the position of each payload block in the plurality of other payload blocks is relative to the plurality of other payload blocks The change of the position of the corresponding payload block of the payload blocks satisfies a predetermined constraint.
  • the predetermined constraint is the number of payload blocks with the largest deviation in position change.
  • the method further includes: placing the service identifier of the OSU frame into the plurality of payload blocks, and the service identifier is used for service verification.
  • the reliability of service transmission can be further improved by carrying the service identifier to check the position information of the payload block mapped to the OSU frame.
  • the embodiment of the present application provides an Optical Transport Network (OTN) device.
  • the apparatus includes a processor and an optical transceiver.
  • the processor is configured to execute the first aspect or any specific implementation method of the first aspect.
  • the sending the OTN frame to the OTN device includes: the processor sending the OTN frame to the optical transceiver; and the optical transceiver sending the OTN frame to the OTN device.
  • the embodiment of the present application provides a chip.
  • the chip includes a processor and a communication interface.
  • the processing is used to execute the first aspect or any specific implementation method of the first aspect.
  • the communication interface is used to interact with the processor to complete sending or receiving frames.
  • the embodiment of the present application provides an optical communication system.
  • the optical communication communication system includes client equipment and the OTN device described in the second aspect. Wherein, the client equipment sends the service data to the OTN device.
  • the optical communication system further includes another OTN device and another client equipment.
  • the client equipment sends service data to the other client equipment through the OTN device and another OTN device.
  • FIG. 1 is a schematic diagram of a possible application scenario of an embodiment of the present application
  • FIG. 2 is a schematic diagram of a possible network device hardware structure
  • Fig. 3 is a schematic diagram of a possible optical service unit (OSU) frame being mapped to an OTN frame;
  • OSU optical service unit
  • FIG. 4 is a schematic flowchart of the first business processing method provided by the embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a second business processing method provided by the embodiment of the present application.
  • Fig. 6 is a schematic diagram of the payload block distribution method of the embodiment shown in Fig. 5;
  • FIG. 7 is a schematic flowchart of a third business processing method provided by the embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a fourth business processing method provided by the embodiment of the present application.
  • FIG. 9 is a schematic flowchart of a fifth business processing method provided by the embodiment of the present application.
  • Fig. 10 is a schematic structural diagram of a possible network device.
  • a plurality refers to two or more.
  • “And/or” describes the association relationship of associated objects, and there may be three kinds of relationships.
  • a and/or B may mean: A exists alone, A and B exist simultaneously, and B exists alone.
  • terms such as “first” and “second” are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.
  • Data is transmitted from source device A to destination device B, and passes through device M; in the data transmission direction, device M is located between device A and device B, then device A is in the upstream direction of device M, and device B is in the direction of device M downstream direction.
  • Service data refers to services that can be carried by the optical transport network.
  • it may be an Ethernet service, a packet service, a wireless backhaul service, and the like.
  • the rounded value of an operation formula may be rounded up or rounded down.
  • mapping of A to B mentioned in this application refers to encapsulating A into B.
  • mapping an OSU frame into an OTN frame refers to encapsulating an OSU frame or an OSU signal into an OTN frame.
  • the embodiments of the present application are applicable to optical networks, such as OTN.
  • An OTN is usually formed by connecting multiple devices through optical fibers, and can be composed of different topology types such as line, ring, and mesh according to specific needs.
  • the OTN 100 shown in FIG. 1 is composed of eight OTN equipment 101, that is, equipment A-H.
  • 102 indicates an optical fiber, which is used to connect two devices;
  • 103 indicates a customer service interface, which is used to receive or send customer service data.
  • OTN 100 is used to transmit service data for client equipment 1-3.
  • the customer equipment is connected to the OTN equipment through the customer service interface.
  • client devices 1-3 are connected to OTN devices A, H and F respectively.
  • an OTN device may have different functions.
  • OTN equipment is divided into optical layer equipment, electrical layer equipment, and optoelectronic hybrid equipment.
  • Optical layer equipment refers to equipment capable of processing optical layer signals, such as: optical amplifier (optical amplifier, OA), optical add-drop multiplexer (optical add-drop multiplexer, OADM).
  • the OA can also be called an optical line amplifier (OLA), which is mainly used to amplify the optical signal to support the transmission of a longer distance under the premise of ensuring the specific performance of the optical signal.
  • OVA optical line amplifier
  • the OADM is used to transform the space of the optical signal so that it can be output from different output ports (also called directions sometimes).
  • Electrical-layer devices refer to devices that can process electrical-layer signals, for example, devices that can process OTN signals.
  • Optical hybrid equipment refers to equipment capable of processing optical layer signals and electrical layer signals. It should be noted that, according to specific integration requirements, an OTN device can integrate multiple different functions. The technical solutions provided by this application are applicable to OTN devices with different forms and integration levels including electrical layer functions.
  • the data frame structure used by the OTN device in the embodiment of the present application is an OTN frame, which is used to carry various service data and provide rich management and monitoring functions.
  • the OTN frame can be an optical data unit frame (Optical Data Unit k, ODUk), ODUCn, ODUflex, or an optical channel transmission unit k (optical transport unit k, OTUk), OTUCn, or a flexible OTN (FlexO) frame, etc.
  • the difference between the ODU frame and the OTU frame is that the OTU frame includes the ODU frame and the OTU overhead.
  • the ODU frame refers to any one of ODUk, ODUCn or ODUflex
  • the OTU frame refers to any one of OTUk, OTUCn or FlexO. It should also be pointed out that with the development of OTN technology, new types of OTN frames may be defined, which are also applicable to this application. In addition, the method disclosed in this application can also be applied to a Flexible Ethernet (Flexible Ethernet, FlexE) frame.
  • FlexE Flexible Ethernet
  • FIG. 2 is a schematic diagram of a possible hardware structure of a network device.
  • the OTN device 200 includes a tributary board 201 , a cross-connect board 202 , a line board 203 , an optical layer processing board (not shown in the figure), and a system control and communication board 204 .
  • the type and number of boards included in the network device may be different.
  • a network device serving as a core node does not have a tributary board 201 .
  • a network device serving as an edge node has multiple tributary boards 201 , or has no optical cross-connect board 202 .
  • a network device that only supports electrical layer functions may not have an optical layer processing board.
  • the tributary board 201 , the cross-connect board 202 and the circuit board 203 are used to process electrical layer signals of the OTN.
  • the tributary board 201 is used to realize the receiving and sending of various customer services, such as SDH service, packet service, Ethernet service and/or fronthaul service and so on.
  • the tributary board 201 may be divided into a client-side optical transceiver module and a signal processor.
  • the client-side optical transceiver module may also be called an optical transceiver, and is used for receiving and/or sending service data.
  • the signal processor is used to realize the mapping and de-mapping processing of business data to data frames.
  • the cross-connect board 202 is used to realize the exchange of data frames, and complete the exchange of one or more types of data frames.
  • the circuit board 203 mainly implements the processing of data frames on the line side. Specifically, the circuit board 203 can be divided into a line-side optical module and a signal processor. Wherein, the line-side optical module may be called an optical transceiver, and is used for receiving and/or sending data frames.
  • the signal processor is used to implement multiplexing and demultiplexing, or mapping and demapping processing of data frames on the line side.
  • the system control and communication board 204 is used to implement system control. Specifically, information may be collected from different boards, or control instructions may be sent to corresponding boards.
  • FIG. 3 is a schematic diagram of a possible mapping of an Optical Service Unit (OSU) frame to an OTN frame.
  • the OTN frame 302 is a schematic diagram of an OTN frame, which has a structure of 4 rows and multiple columns, including an overhead area, a payload area, and a forward error correction (Forward Error Correction, FEC) area.
  • the payload area is divided into multiple payload blocks (Payload Block, PB).
  • PB payload Block
  • Each PB occupies a position of a fixed length (also referred to as a size) in the payload area, for example, 128 bytes.
  • PB payload Block
  • Each PB occupies a position of a fixed length (also referred to as a size) in the payload area, for example, 128 bytes.
  • OTN frame 302 is only one example. Other deformed OTN frames are also suitable for this application.
  • an OTN frame that does not contain an FEC area.
  • the frame structure has a different number of rows and columns than the OTN frame 302 .
  • a PB may also be called a time slot, a time slot block, or a time slice. This application is not bound by its name.
  • Optical Service Unit (Optical Service Unit) frame 301 includes an overhead area and a payload area.
  • the overhead area of the OSU frame 301 is used to carry overhead information.
  • the overhead information may include one or more pieces of information shown in Table 1.
  • the payload area of the OSU frame 301 is used to carry service data.
  • the rate of an OSU frame is defined as an integer multiple of the base rate. Wherein, the reference rate may be 2.6 Mbps, 5.2 Mbps or 10.4 Mbps or multiples of the preceding values.
  • the OSU frame is mapped to the payload area of the OTN frame. Specifically, OSU frames are mapped into PBs of OTN frames. In one possible implementation, one OSU frame is mapped into one PB. In another possible implementation, one OSU frame is mapped into multiple PBs. In this regard, this application does not make a limitation.
  • PBs in an OTN frame are defined as a transmission period.
  • the PB block is allocated for the OSU frame with the transmission cycle as the basic unit. For example, assuming that OSU frames and PBs have the same size and rate, 10 OSU frames carrying service data of the same service may occupy PBs numbered 0-9 in a transmission cycle including 20 PBs.
  • an OSU frame carrying the same service data is called an OSU signal.
  • An OSU signal is a bit stream carrying a service data, and the frame format of the bit stream is the frame format of an OSU frame.
  • An OSU signal can include one or more OSU frames.
  • the transmission period is jointly determined by the rate of the payload area of the OTN frame and the reference rate of the OSU frame.
  • the number of PBs (P) included in the transmission cycle can be defined as:
  • R opu_pld represents the rate of the payload area of the OPU frame
  • Topu represents the frequency offset of the OPU (for example: can be 20ppm)
  • R ref represents the reference rate of the OSU frame. 1000ppm is the frequency offset of the base rate, and this value can be replaced with 100ppm or other values. It should be understood that the above definition is only an example, for example, formula (1-2) can also be used to calculate the P value.
  • the transmission period may be called a P frame, a time slot multiplexing frame, a time slot multiplexing group, a multiplexing frame, a multiplexing period or a transmission frame.
  • this application does not make a limitation.
  • Table 2 gives some examples of P corresponding to some OTN frames. It should be noted that Table 2 calculates the corresponding P value by taking the reference rate of the OSU frame as 2.6 Mbit/s as an example.
  • a possible way to map OSU frames to PB blocks is to dynamically allocate PB positions in the current transmission cycle for these OSU frames when the OTN equipment obtains OSU frames carrying a certain service data (that is, a certain OSU signal) .
  • a certain service data that is, a certain OSU signal
  • an identifier capable of uniquely identifying the service data is added to the corresponding PB. If a bit error occurs during transmission of the identifier, the receiving device cannot determine the service data carried by the OSU frame, and thus cannot recover the service data.
  • the PB positions occupied by OSU frames change dynamically, which brings great complexity to the management and maintenance of data frames.
  • mapping OSU frames to PB blocks is to allocate PBs in descending order of the rates of OSU frames, and also carry service data identifiers to uniquely identify service data carried in OSU frames.
  • This method also has the problem of the previous mapping method (that is, the service is lost after the identification code is wrong).
  • the PB allocated by the OSU frame with a low rate will get the opportunity to allocate PB relatively late, and the uniformity of PB distribution will become worse and worse, and a larger cache needs to be introduced, which increases the complexity of the device.
  • this application provides a new business processing method.
  • the method simplifies the mapping from the OSU frame to the PB, and can reduce the probability of service loss caused by service identification errors.
  • the method introduces this interval constraint, the allocated PB is evenly distributed, the size of the cache is reduced, and the complexity of the device is reduced.
  • Fig. 4 is a schematic flowchart of the first service processing method provided by the embodiment of the present application. As shown in Figure 4, the method includes the following steps. These steps will be described by taking the apparatus H shown in FIG. 1 as an example for executing the method. It should be understood that this embodiment may also be applicable to other OTN devices connected with client devices in FIG. 1 .
  • the device H receives the service data sent by the client device from the client device 2 through the client service interface.
  • the service data of client device 2 needs to be sent to client device 3 .
  • S402 Map the service data into an optical service unit (OSU) frame, the OSU frame includes an overhead part and a payload part, the overhead part is used to carry overhead information, and the payload part is used to carry the business data;
  • OSU optical service unit
  • mapping data services into OSU frames in this step refers to mapping acquired service data into one or more OSU frames within any unit time (for example, in one transmission cycle). Then, in the next unit time, the service data will be loaded into the next or more OSU frames.
  • the positions of the PB payload blocks occupied by the OSU frame may be the same or different. This application is not limited to this.
  • service data is mapped to the OSU frame
  • synchronous mapping for example, bit synchronous mapping (Bit Synchronous Mapping)
  • asynchronous mapping for example, general mapping procedure (Generic Mapping Procedure, GMP)
  • idle mapping IDLE Mapping Procedure, IMP
  • the OSU frame has the frame structure shown in FIG. 3 .
  • the overhead part is the overhead area
  • the payload part is the payload area.
  • an OSU frame is 192 bytes, wherein the overhead area is 7 bytes, and the payload area is 185 bytes.
  • an OSU frame includes overhead subframes and payload subframes; each subframe has a certain frame structure (for example, each subframe is 190 bytes).
  • the foregoing two subframes are respectively used to carry overhead and carry service data. That is to say, the overhead part is an overhead subframe, and the payload part is a data subframe.
  • an OSU frame includes 80 subframes, 4 are overhead subframes, 76 are data subframes, and each subframe is 192 bytes.
  • S403 Map the OSU frame to multiple payload blocks of the OTN frame, and the interval between two adjacent payload blocks of the multiple payload blocks satisfies a preset interval constraint;
  • the device H maps the OSU frame carrying the service data (that is, the OSU signal) into multiple PBs of the OTN frame.
  • the OSU frame may be directly mapped to the OTN frame, or may be mapped to the OTN frame through other intermediate frames.
  • the intermediate frame is an optical service tributary unit (Optical Service Tributary Unit, OSTU), which is composed of corresponding multiple PBs.
  • OSTU Optical Service Tributary Unit
  • the OSU frame is mapped to multiple payload blocks of the OTN frame. It may be that the OSU frame is first mapped into the payload block of the OPU frame or the ODU frame, and then mapped into the OTU frame after time slot multiplexing. Alternatively, the mapping process may be that the OSU frame is re-mapped into the OTN frame through one or more intermediate frames. Alternatively, the OSU signal is directly mapped into the OTU frame. This application does not limit the level of mapping in the OSU frame.
  • the interval is constrained to a fixed number of PBs.
  • the fixed number is the rounded value of P/C.
  • P is the number of payload blocks included in the OTN frame
  • the interval constraint is PB whose value is a numerical range.
  • the value range is (rounded value of (P/C)*(1-R), rounded value of (P/C)*(1+R)), where P is OTN
  • the basic interval may also be referred to as an average data block interval, which may be a rounded value of (P/C).
  • the maximum interval deviation value may also be referred to as the maximum data block interval deviation, and may be a rounded value of (P/C)*R.
  • P, C and R refer to the previous implementation manner, which will not be repeated here.
  • the interval constraint may be called an interval rule, an interval distance, a distance constraint, or a distance rule.
  • this application does not make a limitation.
  • the interval is an interval that can be calculated from the data block at the start position or the data that does not include the start position. In this regard, this application does not make a limitation.
  • the OTN frame mentioned in the foregoing multiple possible implementation manners may be an OTN frame as shown in FIG. 3 ; or may also be replaced with a transmission period. To simplify the description, unless otherwise specified, the OTN frame also includes a transmission period.
  • S404 Send the OTN frame to the OTN device.
  • device H sends an OTN frame carrying an OSU frame to device F.
  • the device F is an OTN device connected to the destination client device 3 .
  • the foregoing sending may be directly sent to the device F, that is, there is a direct physical connection between the device H and the device F.
  • the foregoing sending may also be sent by the device H to a downstream intermediate device (such as the device G in FIG. 1 ), and the intermediate device is sending to the device F.
  • the method disclosed in the embodiment of the present application solves the potential bit error risk caused by dynamic allocation, and the sending device and the receiving device can use this position interval to resolve the PB position corresponding to the OSU frame, So as to correctly restore the business data.
  • An embodiment of the present application provides a method, device and system for business processing.
  • the sending end device is F and the receiving end device is A in this embodiment.
  • the path used by device F and device A to transmit services may be, for example, device F-device G-device H-device A, wherein device F is a source device, device A is a destination device, and device G and device H are intermediate devices.
  • FIG. 5 is a schematic flowchart of a second service processing method provided by the embodiment of the present application. Each step is described in detail below. In the following steps, steps S401, S502-S504 are executed by the sending end device F, and steps S601-S602 are executed by the receiving end device A. It should be noted that, in order to avoid redundancy, the OTN frame received by the receiving device A and sent by the device F is not shown repeatedly in FIG. 5 .
  • step S401 is similar to step S401 in FIG. 4 , and the description for step S401 is also applicable to this step, and will not be repeated here.
  • device F receives service data through a customer service interface.
  • S502 Map the service data into an optical service unit (OSU) frame, the OSU frame includes an overhead area and a payload area, the overhead area is used to carry overhead information, and the payload area is used to carry the business data;
  • OSU optical service unit
  • this embodiment takes the OSU frame shown in FIG. 3 as an example, which includes an overhead area and a payload area.
  • the benchmark rate of the OSU frame is 10.4Mbps. It should be noted that rate and bandwidth are interchangeable concepts in this application.
  • This step is similar to step S402 in FIG. 4 , and other descriptions for step S402 are also applicable to this step, which will not be repeated here. For example, for the length of the OSU frame, the number of required OSU frames, etc.
  • S503 Map the OSU frame to multiple payload blocks of the OTN multiplexing frame, and the interval between two adjacent payload blocks of the multiple payload blocks satisfies a preset interval value;
  • an OTN multiplexed frame (or multiplexed frame for short) is constructed by taking the OTN frame as ODU0 as an example.
  • the number of payload blocks contained in the multiplexing frame is calculated according to the following formula:
  • 10.4M is the basic rate of the OSU frame.
  • X ppm is the frequency offset, it can be 0, 20 or 100, and ppm is one millionth.
  • R odu_PLD is the rate of the payload area of the OTN frame, and the rate of the ODU0 frame is: 1238.954310000 Mbps.
  • the size of a PB is an integer multiple of a single byte, for example, 16 bytes, 32 bytes, 64 bytes, 128 bytes, 192 bytes or 256 bytes.
  • one multiplexing frame includes the payload area of 1.5 ODU frames.
  • the boundaries of the multiplex frame constructed in this way and the ODU frame are kept aligned, which simplifies the design and implementation, and facilitates the management of the data frame.
  • PBs can be assigned sequentially to OSU frames that need to be assigned PBs, according to the number of PBs from small to large and according to the value of interval constraints.
  • PB allocation may be performed according to the method steps shown in FIG. 6 .
  • FIG. 6 is a schematic diagram of the payload block allocation method of the embodiment shown in FIG. 5 .
  • each OSU signal includes one or more OSU frames, and the n OSU signals need to be allocated with PBs.
  • the PB allocation process of each OSU signal executes the method 700 .
  • PB location information specifically refers to the number of the PB in an OTN multiplex frame or OTN frame, or location identification information (for example: rank and column information of the PB in the OTN, etc.).
  • different OSU signals can obtain PB allocation opportunities according to the above method 700.
  • PB allocation for n OSU signals In order to avoid PB allocation conflicts between different OSU signals, as shown in Figure 6, after obtaining the PB location indication, you can follow Predetermined interval constraints, PB allocation for n OSU signals. That is to say, centralized PB allocation is performed on n OSU signals, which can prevent the PB location allocation conflict problem that exists when each OSU signal is allocated PB independently.
  • the multiple OSU signals may be sorted according to a pre-agreed allocation rule. For example, the highest Sum i value corresponding to the OSU signal is given priority to PB allocation.
  • the Sum i value is the same, it is sorted according to the OSU frame number (for example, the number is larger first); or, it can be sorted according to the Ci value of the OSU signal. Larger values are preferred.
  • the associated information of P PBs and n OSU signals can be finally obtained, that is, OSU frames respectively carried by P PBs can be obtained.
  • Table 2 gives an example of PB allocation. Among them, only the distribution situation of the service identification information of 20 is given completely; assuming that the interval value is 10, and the value of C is 7. It should be understood that the service identification information may also be called a service identification number, a service identification number, service indication information, service occupation indication information, or service occupation PB indication information.
  • the receiving end can calculate the OSU frame used to carry the same service data in the PB of the OTN frame according to the configured rule information, so that after receiving the OTN frame, it can parse the corresponding OSU frame. And finally get business data.
  • mapping the OSU frame to the plurality of payload blocks corresponding to the location information may also be implemented in other manners. For example, determining the OSU frame and mapping the OSU frame to the PB block may be performed alternately until the mapping position of the OSU frame stream to the PB block is completed. In contrast, this application does not make a limitation.
  • device F sends the OTN multiplex frame carrying the OSU frame to device A.
  • S504 can also be described as device F sending the OTN frame to device A, because the frame structure of the multiplexing frame is based on the OTN frame structure. For example, if the payload area of the OTN frame has a frame structure of 4 rows and 3808 columns of bytes. Then, in this embodiment, the OTN multiplexing frame is 1.5 times the OTN frame, that is, a frame structure with 6 rows and 3808 columns of bytes.
  • the OTN multiplexing frame may also be constructed based on other types of OTN frames.
  • ODU1 OTN multiplexing frames
  • the P value can be calculated according to the following formula.
  • Table 3 gives examples of other P values calculated by the above formula.
  • the OTN multiplex frame mapped to the OSU frame is based on OPU2 (or ODU2)
  • the OTN multiplex frame includes 12 OPU2 frames (or ODU2).
  • the multiframe overhead indication of the OTN frame can be used. For example, by performing a 0-11 cycle through the value of the multiframe indication overhead, the initial OTN frame corresponding to the OTN multiplexing frame and the number of included OTN frames can be determined by obtaining the value of the multiframe overhead indication.
  • S601 Demap the OSU frame from the OTN multiplexing frame according to the preset interval value
  • the above two steps are the actions performed by the receiving device, that is, device A.
  • the device A parses or demaps the OSU frame. It is understood that the received OTN multiplex frame may also include OSU frames carrying other service data. Therefore, device A needs to obtain the PB location information corresponding to the service data according to the preset interval value. Then, according to the PB position information, the OSU frame taken out from the corresponding PB position is processed as a whole to obtain the corresponding service data.
  • the method of the embodiment of the present application can solve the existing possible bit error risk, determine the PB position through the interval value to restore the service data, and improve the reliability of the network.
  • the PB position occupied by the OSU frame is relatively deterministic, this makes the management of the frame relatively simple and deterministic, which is conducive to ensuring the transmission performance of the device.
  • An embodiment of the present application provides a method, device and system for business processing.
  • the sending end device is A and the receiving end device is H in this embodiment. It should be understood that this embodiment may also be replaced with other devices and service transmission paths.
  • FIG. 7 is a schematic flowchart of a third service processing method provided by the embodiment of the present application. It should be noted that, in order to avoid redundancy, the OTN frame sent by the device H received by the receiving device A is not shown repeatedly in FIG. 7 . It should also be noted that steps S401 , S403 and S404 are the same as those shown in FIG. 4 , and will not be repeated here. The following mainly introduces steps S802-S803, and steps S901-902.
  • S802 Map the service data into an optical service unit (OSU) frame, the OSU frame includes an overhead subframe and a payload subframe, the overhead subframe is used to carry overhead information, and the payload subframe is used for to bear the business data;
  • OSU optical service unit
  • S403 Map the OSU frame to multiple payload blocks of the OTN frame, and the interval between two adjacent payload blocks of the multiple payload blocks satisfies a preset interval constraint;
  • S404 Send the OTN multiplexing frame to the device H;
  • S802 provides a frame structure different from the OSU frame in the embodiment shown in FIG. 5 , that is, an OSU frame is composed of multiple subframes, and different types of subframes have different functions. It should be understood that this embodiment may also be replaced by the frame structure of the OSU frame as shown in FIG. 5 .
  • the device A in addition to sending the OSU frames carrying the service data to the device H through the OTN frame, the device A also sends the location information of the PBs carrying the OSU frames to the device H through the OTN frame (that is, step S803).
  • Table 3 gives an example of a device A recording multiple PB location information corresponding to an OSU frame.
  • P represents the number of PBs contained in an OTN frame (or multiplexed frame as shown in FIG. 5 )
  • n indicates the total number of services carried by the OTN frame (or multiplexed frame).
  • the receiving device can correctly retrieve the service data.
  • PB numbers belonging to the same service identifier can be directly grouped into one group, and the PB location information can be transmitted in a manner of sending n PB number groups. This application is not limited to this.
  • the interval constraint can be realized in many ways. If the interval constraint is a fixed number of PBs, then in the embodiment shown in FIG. 5 , no location information is sent. Alternatively, device A may also send location information for verification. If the interval constraint is an interval range or other similar forms of PB, then device A can send location information so that device H can correctly parse out the OSU frame carrying the same service data. Specifically, in a possible implementation manner, device A may use one or more PBs or a part of one or more PBs of the OTN frame to transmit this information. In another possible implementation manner, device A may use OTN frame overhead, for example: OPU frame overhead or ODU frame overhead, to transmit this information. In addition, optionally, in order to improve the reliability of the information transmission, device A may encode or transmit multiple copies of the same location information. Alternatively, transmission reliability can be improved through the embodiment shown in FIG. 8 .
  • the above method of transmitting PB location information by using the OTN frame can be understood as a path-associated method, that is, service data and corresponding management information are transmitted through the same path.
  • the device A may send the PB location information to the network management system or the network controller, and then the network management system or the controller transmits it to the device H.
  • this application does not make a limitation.
  • S901 Demap the OSU frame from the OTN frame according to the position information of the payload block
  • the above two steps are steps performed by the receiving device H. Specifically, device H parses out the PB location information from the received OTN frame, and then parses the OSU frame contained in the OTN frame according to the location information, and demaps the OSU frames carrying the same service data together to finally obtain the service The data is sent to the connected client device to complete the end-to-end business transmission.
  • the method of the embodiment of the present application can solve the existing possible bit error Risk, the location of PB is determined through interval constraints to restore business data, which improves the reliability of the network.
  • FIG. 8 is a schematic flowchart of a fourth service processing method provided by the embodiment of the present application. It should be noted that, in order to avoid redundancy, the OTN frame sent by the device H received by the receiving device A is not shown repeatedly in FIG. 8 . It should also be noted that for steps with the same numbers as those in FIG. 7 , reference may be made to the relevant description in FIG. 7 , and details are not repeated here. The following mainly introduces steps S1003, S1101 and S1102.
  • S802 Map the service data into an optical service unit (OSU) frame, the OSU frame includes an overhead subframe and a payload subframe, the overhead subframe is used to carry overhead information, and the payload subframe is used for to bear the business data;
  • OSU optical service unit
  • S403 Map the OSU frame to multiple payload blocks of the OTN frame, and the interval between two adjacent payload blocks of the multiple payload blocks satisfies a preset interval constraint;
  • S404 Send the OTN multiplexing frame to the device H.
  • S901 Demap the OSU frame from the OTN frame according to the position information of the payload block
  • S1101 According to the service identification information carried by the plurality of payload blocks, check whether the obtained OSU frame matches the location information;
  • step S401, S802, S403, S1003, S803 and S404 are performed by the sending end device A.
  • device A in addition to carrying OSU frames in the PB, device A also carries service identifiers. Specifically, it may carry a tributary port (Tributary Port Number, TPN) or other identifiers that can uniquely identify a service data.
  • TPN Tributary Port Number
  • This business identifier is used for business verification.
  • this service identifier can be used by the receiving end device H to cross-check the received PB and OSU frame related information (that is, which service is carried by the current PB, which can be called the PB position information corresponding to the OSU frame), so as to Further improve the reliability of equipment service transmission.
  • a stuffing block may be inserted for rate matching (the stuffing block does not contain service data, and is usually a preset value). An identical filler identifier can be entered for this filler. Or, for stuffing blocks belonging to different OSU frames, the TPN number of the OSU frame can be filled in to better realize service isolation (that is, the PB position belonging to a certain OSU signal can be clearly identified). In the latter case, in order to identify the OSU frame and the stuffing block, a new bit can be added to distinguish them.
  • S901, S1101 and S1102 are performed by the receiving device H.
  • the device H checks whether the OSU frame determined by the service identification information matches the obtained location information. If it is determined to be consistent (that is, match), the device H continues to execute S1102, that is, acquires service data. If there is a mismatch, for example, device H is required to verify whether the transmission of PB location information is wrong, so as to ensure the correctness of business data analysis and transmission.
  • S803 is an optional step. That is to say, device A and device H do not exchange location information, but obtain location information through configuration information respectively. Through step S1003, the device H can verify whether the location information acquired through configuration parameters is correct, which improves the reliability of data transmission.
  • FIG. 9 is a schematic flowchart of a fifth business processing method provided by the embodiment of the present application.
  • This embodiment is mainly aimed at the change in the number of OSU frames caused by the increase in the number of services, so that the corresponding relationship between OSU frames and PBs changes; or the change in the number of corresponding OSU frames caused by changes in the rate of service data, Thus, the scene of the corresponding relationship between the OSU frame and the PB is made.
  • the method includes the following steps.
  • the service data is mapped into the OSU frame and passed to the peer device through a set of PB positions.
  • S1202 Map the service data into another optical service unit (OSU) frame;
  • OSU optical service unit
  • the service data of this certain period is mapped into another OSU frame. It should be understood that there may be one or more other OSU frames. In this regard, this embodiment does not make a limitation.
  • the number of current OSU frames (that is, another OSU frame) is different from the number of OSU frames used in the previous cycle. Or, if it is because other new services need to be mapped into OSU frames, then the number of current OSU frames is the same as the number of OSU frames used in the previous cycle.
  • S1203 Map the other OSU frame into multiple other payload blocks of another OTN frame, where the position of each payload block in the multiple other payload blocks is relative to the multiple payload blocks The change of the position of the corresponding payload block of the charge block satisfies a predetermined constraint;
  • the relative change between the PB position allocated in the current cycle and the position allocated in the previous cycle needs to be relatively small. For example, if 3 PB blocks with positions 1, 11 and 21 were previously allocated. If this position needs to be adjusted, then the adjustable range of each position can be set with a maximum PB deviation value. For example, it may be a rounded value of 0.5*(P/C). (If the maximum deviation value is 2, it means that the deviation between the current cycle PB position and the corresponding previous week's PB position is within the range of (-2,+2) PB.
  • the maximum PB deviation value is 2
  • the positions allocated in the current cycle can be 2, 12 and 20. It should be understood that in this embodiment, the PB position allocated in the current cycle needs to meet two constraints, one is the interval constraint, and the other is to constrain the change of different cycles range constraints.
  • another OTN frame carrying the other OSU frame is sent to a downstream OTN device.
  • this embodiment is similar to that shown in FIG. 4 .
  • this embodiment of the present application avoids large changes in OSU frame mapping positions and reduces the complexity of frame management.
  • Fig. 10 is a schematic structural diagram of a possible network device.
  • a network device 1300 includes a processor 1301 , an optical transceiver 1302 and a memory 1303 . Wherein, the memory 1303 is optional.
  • the network device 1300 can be applied to both the sending side device and the receiving side device.
  • the processor 1301 When applied to a sending-side device, the processor 1301 is configured to implement the method executed by the sending device shown in FIG. 4 or FIG. 9 or shown in FIGS. 5, 7-8. In the implementation process, each step of the processing flow can implement the method executed by the sending device in the above-mentioned figures through an integrated logic circuit of hardware in the processor 1301 or an instruction in the form of software.
  • the optical transceiver 1302 is used to receive and process the sent OTN frame, which has been sent to the peer device (also called the receiving device).
  • the processor 1301 When applied to a receiving-side device, the processor 1301 is configured to implement the method executed by the receiving device shown in any one of FIG. 5 or 7-8. In the implementation process, each step of the processing flow can implement the method executed by the receiving-side device described in the preceding figures through an integrated logic circuit of hardware in the processor 1201 or an instruction in the form of software.
  • the optical transceiver 1302 is used to receive the OTN frame sent by the peer device (also referred to as the sending device), and send it to the processor 1301 for subsequent processing.
  • the memory 1303 may be used to store instructions such that the process 1301 may be used to perform steps as mentioned in the above figures. Alternatively, the storage 1303 may also be used to store other instructions to configure parameters of the processor 1301 to implement corresponding functions.
  • processor 1301 and the memory 1303 may be located in a tributary board in the hardware structure diagram of the network device shown in FIG. 2 , or may be located in a single board that integrates a tributary and a line.
  • both the processor 1301 and the memory 1303 include multiple ones, respectively located on the tributary board and the circuit board, and the two boards cooperate to complete the foregoing method steps.
  • FIG. 10 may also be used to execute the method steps involved in the modification of the embodiment shown in the above-mentioned drawings, and details are not repeated here.
  • the processor 1301 in the embodiment of the present application may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may realize or execute Various methods, steps and logic block diagrams disclosed in the embodiments of the present application.
  • a general purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the methods disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software units in the processor.
  • the program codes executed by the processor 1301 to implement the above methods may be stored in the memory 1303 .
  • the memory 1303 is coupled to the processor 1301 .
  • the coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • Processor 1301 may cooperate with memory 1303 .
  • the memory 1303 may be a non-volatile memory, such as a hard disk (hard disk drive, HDD), and may also be a volatile memory (volatile memory), such as a random-access memory (random-access memory, RAM).
  • the memory 1303 is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.
  • the embodiments of the present application further provide a computer-readable storage medium.
  • a software program is stored in the storage medium, and when the software program is read and executed by one or more processors, the method provided by any one or more embodiments above can be implemented.
  • the computer-readable storage medium may include: a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and other media capable of storing program codes.
  • the embodiment of the present application further provides a chip.
  • the chip includes a processor configured to implement the functions involved in any one or more of the above embodiments, such as acquiring or processing the data frames involved in the above methods.
  • the chip further includes a memory for necessary program instructions and data executed by the processor.
  • the chip may consist of chips, or may include chips and other discrete devices.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
  • the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

Sont divulgués dans la présente demande un procédé, un appareil et un système de traitement de service dans un réseau de transport optique (OTN). Le procédé de traitement de service divulgué dans la présente demande comprend une pluralité d'étapes. Premièrement, un dispositif OTN obtient des données de service, puis le dispositif OTN mappe les données de service dans une trame d'unité de service optique (OSU), la trame OSU comprenant une partie de surdébit et une partie de charge utile, la partie de surdébit étant utilisée pour supporter des informations de surdébit, et la partie de charge utile étant utilisée pour supporter les données de service. Deuxièmement, le dispositif OTN mappe la trame OSU dans une pluralité de blocs de charge utile d'une trame OTN, un intervalle entre deux blocs de charge utile adjacents de la pluralité de blocs de charge utile satisfaisant une contrainte d'intervalle prédéfinie. Enfin, le dispositif OTN envoie la trame OTN à un dispositif OTN cible. Par définition de la position d'une trame OSU mappée à des blocs de charge utile, la solution de traitement de service divulguée dans la présente demande réduit le risque de perte de service. De plus, le procédé simplifie également le traitement et la gestion de mappage de trames, et réduit la complexité du dispositif.
PCT/CN2023/070332 2022-01-14 2023-01-04 Procédé, appareil et système de traitement de service dans un réseau de transport optique WO2023134508A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210041213.3 2022-01-14
CN202210041213.3A CN116489537A (zh) 2022-01-14 2022-01-14 一种光传送网中的业务处理的方法、装置和系统

Publications (1)

Publication Number Publication Date
WO2023134508A1 true WO2023134508A1 (fr) 2023-07-20

Family

ID=87223729

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/070332 WO2023134508A1 (fr) 2022-01-14 2023-01-04 Procédé, appareil et système de traitement de service dans un réseau de transport optique

Country Status (2)

Country Link
CN (1) CN116489537A (fr)
WO (1) WO2023134508A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117278891A (zh) * 2023-11-21 2023-12-22 北京智芯微电子科技有限公司 数据传输系统、数据传输方法及芯片

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101800614A (zh) * 2009-02-05 2010-08-11 华为技术有限公司 光传送网中的通用映射、解映射方法及装置
WO2016058316A1 (fr) * 2014-10-17 2016-04-21 中兴通讯股份有限公司 Procédé et appareil pour envoyer et recevoir des signaux par l'intermédiaire d'une unité de transmission de canal optique
CN111865887A (zh) * 2019-04-30 2020-10-30 华为技术有限公司 光传送网中的数据传输方法及装置
CN112511917A (zh) * 2020-02-28 2021-03-16 中兴通讯股份有限公司 光传送网中业务处理方法、处理装置和电子设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101800614A (zh) * 2009-02-05 2010-08-11 华为技术有限公司 光传送网中的通用映射、解映射方法及装置
WO2016058316A1 (fr) * 2014-10-17 2016-04-21 中兴通讯股份有限公司 Procédé et appareil pour envoyer et recevoir des signaux par l'intermédiaire d'une unité de transmission de canal optique
CN111865887A (zh) * 2019-04-30 2020-10-30 华为技术有限公司 光传送网中的数据传输方法及装置
CN112511917A (zh) * 2020-02-28 2021-03-16 中兴通讯股份有限公司 光传送网中业务处理方法、处理装置和电子设备

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117278891A (zh) * 2023-11-21 2023-12-22 北京智芯微电子科技有限公司 数据传输系统、数据传输方法及芯片
CN117278891B (zh) * 2023-11-21 2024-04-12 北京智芯微电子科技有限公司 数据传输系统、数据传输方法及芯片

Also Published As

Publication number Publication date
CN116489537A (zh) 2023-07-25

Similar Documents

Publication Publication Date Title
US11764874B2 (en) Method for processing low-rate service data in optical transport network, apparatus, and system
US10374738B2 (en) Method and apparatus for transporting client signals in an optical transport network
US11234055B2 (en) Service data processing method and apparatus
WO2020221141A1 (fr) Procédé et dispositif permettant de transmettre des données dans un réseau de transport optique
US10608766B2 (en) Multi-service transport and receiving method and apparatus
WO2016026348A1 (fr) Procédé, dispositif et système de traitement de signal
EP4027650A1 (fr) Procédé et dispositif de traitement de données de service dans un réseau de transport optique, et système associé
CN113395613B (zh) 一种业务承载的方法、装置和系统
WO2020192533A1 (fr) Procédé et appareil de traitement de données de service
WO2023134508A1 (fr) Procédé, appareil et système de traitement de service dans un réseau de transport optique
CN102098595B (zh) 一种光传送网中客户信号传送方法及相关设备
WO2023143577A1 (fr) Procédé, appareil et système de traitement de trame de données dans un réseau de transport optique
WO2024051586A1 (fr) Procédé de traitement de trame de données dans un réseau de transport optique, appareil et système
WO2023151483A1 (fr) Procédé et dispositif de traitement de trame de données
WO2023083254A1 (fr) Procédé et appareil de transport de signaux optiques
WO2024109725A1 (fr) Procédé de mappage de données, procédé de dé-mappage de données et dispositif associé

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23739852

Country of ref document: EP

Kind code of ref document: A1