WO2024109349A1 - Procédé et appareil de transmission de données - Google Patents

Procédé et appareil de transmission de données Download PDF

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Publication number
WO2024109349A1
WO2024109349A1 PCT/CN2023/122564 CN2023122564W WO2024109349A1 WO 2024109349 A1 WO2024109349 A1 WO 2024109349A1 CN 2023122564 W CN2023122564 W CN 2023122564W WO 2024109349 A1 WO2024109349 A1 WO 2024109349A1
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WIPO (PCT)
Prior art keywords
time slot
indication information
data
slot block
group
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PCT/CN2023/122564
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English (en)
Chinese (zh)
Inventor
孙亮
魏骥川
苏伟
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华为技术有限公司
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Publication of WO2024109349A1 publication Critical patent/WO2024109349A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received

Definitions

  • the present application relates to the field of optical communications, and more specifically, to a method and device for transmitting data.
  • Optical Transport Network is the core infrastructure network of the 5th generation fixed network. It is widely deployed in trunk lines, metro core and metro edge. It has the natural advantages of high quality, large capacity and wide coverage. Adding small-granularity pipes to the OTN network to carry these high-quality connections has become a hot topic.
  • the Optical Service Unit (OSU) currently developed by the China Communications Standards Association (CCSA) is used to carry small-granularity services in the OTN network. Multiple services are mapped and encapsulated into multiple OSUs. Different OSUs correspond to different Flexible Tributary Units (TUflex), and then multiple TUflexes are multiplexed into the Optical Payload Unit (OPU).
  • TUflex Flexible Tributary Units
  • OSU Optical Payload Unit
  • CRC-8 check code in the cyclic redundancy check (CRC) is used to perform cyclic redundancy check on the general overhead and special overhead of the OSU frame.
  • CRC check fails, the entire 192-byte payload block (PB) of the OSU frame is discarded, and the bit error is expanded to data loss, which affects the reliability of data transmission. Due to the above problems with 192-byte PB, a small slot granularity (e.g., 10M) is proposed, and the control of rate adaptation in the small slot granular
  • the present application provides a method and device for transmitting data, which can realize rate adaptation control when transmitting data with small time slot granularity.
  • an embodiment of the present application provides a method for transmitting data, which can be executed by a sending device, or can also be executed by a component of the sending device (for example, a chip or a circuit), without limitation.
  • the method for transmitting data includes: receiving service data; mapping the service data to an optical transport network (OTN) frame, the overhead area of the OTN frame includes a group of indication information, the payload area of the OTN frame includes a group of time slot blocks, the group of indication information is used to indicate that the object carried by the group of time slot blocks is data or padding, the group of indication information is located in at least one row in the overhead area of the OTN frame, the group of time slot blocks is located in at least one row in the payload area of the OTN frame, and the at least one row where the group of indication information is located is located before the at least one row where the group of time slot blocks is located; sending the OTN frame.
  • OTN optical transport network
  • a group of indication information is generally continuous in the overhead area of the OTN frame, so the following description is taken as an example of a group of indication information being a group of continuous indication information.
  • the relevant description of the indication information can also refer to the case where the indication information is continuous, and the description will not be repeated in this application.
  • multiple indication information is defined in the overhead area of the OTN frame, and the multiple indication information is used to indicate that the objects carried by multiple time slot blocks located after the multiple indication information in the payload area of the OTN frame (for example, the row where the indication information is located is before the row where the time slot block is located) are data or padding. Indicating that a certain time slot block is data or padding is to indicate whether the time slot block is a time slot block carrying data or a padding block, so that the receiving end device can parse the received OTN frame, that is, the method for transmitting data can complete the rate adaptation control of multiple time slot blocks divided in the OTN frame.
  • mapping the service data to the OTN frame includes: mapping the service data to multiple time slot blocks in the group of time slot blocks in the payload area of the OTN frame, wherein the indication information corresponding to the first time slot block in the multiple time slot blocks is used to indicate that the object carried by the first time slot block is data or padding, and the multiple time slot blocks The objects carried by the time slot blocks in the block except the first time slot block are data.
  • indication information can be used to indicate that the object carried by one of the multiple time slot blocks is data or padding, and the objects carried by other time slot blocks are data (no indication is required for the other time slot blocks, or they are fixedly indicated as data), which can further reduce the indication overhead.
  • an embodiment of the present application provides a method for transmitting data.
  • the method may be executed by a receiving device, or may be executed by a component (eg, a chip or a circuit) of the receiving device, without limitation.
  • the method for transmitting data comprises: receiving an optical transport network (OTN) frame, the OTN frame being used to carry service data, the overhead area of the OTN frame comprising a group of continuous indication information, the payload area of the OTN frame comprising a group of time slot blocks, the group of continuous indication information being used to indicate that the objects carried by the group of time slot blocks are data or padding, the group of continuous indication information being located in at least one row in the overhead area of the OTN frame, the group of time slot blocks being located in at least one row in the payload area of the OTN frame, the at least one row in which the group of indication information is located being located before the at least one row in which the group of time slot blocks are located; and determining, according to the group of continuous indication information, that the objects carried by the group of time slot blocks are data or padding.
  • OTN optical transport network
  • the receiving end device can determine whether the objects carried by the multiple time slot blocks in the OTN frame are data or padding based on the overhead area of the OTN frame.
  • the method when the service data is mapped to multiple time slot blocks in the group of time slot blocks, the method also includes: determining that the objects carried by the time slot blocks other than the first time slot block in the multiple time slot blocks are data; and determining that the object carried by the first time slot block is data or padding based on the indication information corresponding to the first time slot block in the group of continuous indication information.
  • the receiving end device can default to the objects carried by the time slot blocks other than the first time slot block in the multiple time slot blocks as data, so that the first time slot block object can be indicated as data or filler, further reducing the indication overhead.
  • the first indication information in the set of continuous indication information includes multiple bits, and the multiple bits are multiple bits in the same column of at least one row of the overhead area of the OTN frame.
  • the first indication information is used to indicate that the object carried by the second time slot block in the set of time slot blocks is data or padding, wherein the position of the second time slot block in the set of time slot blocks is the same as the position of the first indication information in the set of continuous indication information.
  • each indication information may occupy multiple bits or one bit, and there is no specific restriction on the number of bits occupied by the indication information, thereby improving the flexibility of the solution.
  • the first indication information is used to indicate that the object carried by the first time slot block is data or padding, including: the value of more than half of the multiple bits is 0, indicating that the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is padding; or, the value of more than half of the multiple bits is 1, indicating that the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is padding.
  • the first indication information when it is determined that the first indication information satisfies a first condition, it is determined that the object carried by the first time slot block is data, wherein the first condition is that the value of more than half of the multiple bits occupied by the first indication information is 0 or 1.
  • the bearer object of the corresponding time slot block can be indicated by majority decision, thereby improving the reliability of the solution.
  • the number of the multiple bits is 3, and at least one row where the set of indication information is located is row 1 to row 3 of the overhead area of the OTN frame.
  • the number of bits occupied by each indication information may be 3.
  • the bearer object of the corresponding time slot block can be indicated based on majority decision, a smaller number of bits is used to achieve rate adaptation control.
  • the set of continuous indication information is a set of continuous indication information included in a first frame indicated by a multiframe alignment signal MFAS in an overhead area of the OTN frame, wherein the first frame is one of at least one frame indicated by the MFAS, and each frame of the at least one frame includes at least one indication information.
  • the above set of continuous indication information is the overhead in one frame indicated by MFAS, that is, the method for transmitting data can complete the rate adaptation control of multiple time slot blocks in one frame, thereby improving the control efficiency.
  • the group of time slot blocks is a time slot block corresponding to the group of continuous indication information in y time slot blocks included in the first time slot block period, and the first time slot block period is from One of at least one time slot block period, each time slot block period in the at least one time slot block period includes the y time slot blocks.
  • the overhead area of the OTN frame also includes second indication information, and the second indication information is used to indicate that the group of time slot blocks belongs to the first time slot block group among the multiple time slot block groups.
  • the rate of each of the time slot blocks is 10.4 megabits per second Mbit/s.
  • an embodiment of the present application provides a method for transmitting data, which can be executed by a sending device, or can also be executed by a component of the sending device (for example, a chip or circuit), without limitation.
  • the method for transmitting data includes: receiving service data; mapping the service data to an optical transport network (OTN) frame, wherein the overhead area of the first cycle of the OTN frame includes multiple indication information, the payload area of the second cycle of the OTN frame includes multiple time slot block groups, the multiple indication information is used to indicate the change in the amount of data carried by each of the multiple time slot block groups, the second cycle is the next cycle of the first cycle, each of the multiple time slot block groups includes multiple time slot blocks, and the multiple time slot blocks are in the same position in multiple time slot block cycles.
  • the multiple indication information is generally continuous in the overhead area of the OTN frame, so the following description is taken as an example of multiple indication information being multiple continuous indication information. In the case where the multiple indication information is not continuous, the relevant description of the indication information can also refer to the case where the indication information is continuous, and the description will not be repeated in this application.
  • multiple indication information is defined in the overhead area of the current cycle of the OTN frame, and the multiple indication information respectively indicates the change in the amount of data carried by multiple time slot block groups in the payload area of the next cycle of the OTN frame.
  • the change in the amount of data of a certain time slot block group is indicated to determine whether the objects carried by the multiple time slot blocks included in the time slot block are data or padding, so as to facilitate the receiving end device to parse the received OTN frame, that is, the method for transmitting data can complete the rate adaptation control of multiple time slot blocks divided in the OTN frame.
  • mapping the service data to the OTN frame includes: mapping the service data to at least two time slot block groups among the multiple time slot block groups, wherein at least one of the indication information corresponding to the at least two time slot block groups is used to indicate a change in the amount of data of the at least two time slot block groups.
  • the change in the amount of data in the multiple time slot block groups can be indicated by at least one indication information, which can further reduce the indication overhead.
  • an embodiment of the present application provides a method for transmitting data.
  • the method may be executed by a receiving device, or may be executed by a component (eg, a chip or a circuit) of the receiving device, without limitation.
  • the method for transmitting data comprises: receiving an optical transport network (OTN) frame, the OTN frame being used to carry service data, an overhead area of a first cycle of the OTN frame comprising a plurality of continuous indication information, a payload area of a second cycle of the OTN frame comprising a plurality of time slot block groups, the plurality of continuous indication information being respectively used to indicate a change in the amount of data carried by each of the plurality of time slot block groups, the second cycle being a cycle next to the first cycle, each of the plurality of time slot block groups comprising a plurality of time slot blocks, the plurality of time slot blocks being at the same position in a plurality of time slot block cycles; and determining a change in the amount of data carried by each of the plurality of time slot block groups according to the plurality of continuous indication information.
  • OTN optical transport network
  • the receiving end device can determine the change in the amount of data carried by multiple time slot block groups in the OTN frame based on the overhead area of the OTN frame, thereby determining whether the objects carried by the multiple time slot blocks included in the time slot block group are data or padding, and completing the rate adaptation control of the multiple time slot blocks divided in the OTN frame.
  • the method when the service data is mapped to at least two time slot block groups among the multiple time slot block groups, the method further includes: determining the change in the amount of data carried by the at least two time slot block groups based on at least one of the indication information corresponding to the at least two time slot block groups in the multiple consecutive indication information.
  • the receiving end device can determine the change in the amount of data carried by the multiple time slot block groups based on at least one of the indication information corresponding to the multiple time slot block groups, which is equivalent to considering the multiple time slot block groups as a group, further reducing the indication overhead.
  • the third indication information in the multiple consecutive indication information includes multiple bits, and the multiple bits are multiple bits in the same column of at least one row of the overhead area of the OTN frame.
  • the third indication information is used to indicate the change in the amount of data carried by the first time slot block group in the multiple time slot block groups, wherein the position of the first time slot block group in the multiple time slot block groups is the same as the position of the third indication information in the multiple consecutive indication information.
  • each indication information may occupy multiple bits or one bit, and there is no specific restriction on the number of bits occupied by the indication information, thereby improving the flexibility of the solution.
  • the third indication information is used to indicate the change in the amount of data carried by the first time slot block group, including: the value of more than half of the multiple bits is 0, indicating that the change in the amount of data carried by the first time slot block group is 0, otherwise, indicating that the change in the amount of data carried by the first time slot block group is 1; or, the value of more than half of the multiple bits is 1, indicating that the change in the amount of data carried by the first time slot block group is 1, otherwise, indicating that the change in the amount of data carried by the first time slot block group is 0.
  • the bearer object of the corresponding time slot block can be indicated by majority decision, thereby improving the reliability of the solution.
  • the multiple continuous indication information is continuous indication information included in the first frame indicated by the multiframe alignment signal MFAS in the overhead area of the OTN frame, wherein the first frame is one of at least one frame indicated by the MFAS, and each frame of the at least one frame includes at least one indication information.
  • some descriptions of the indication information involved in the third aspect or the fourth aspect can refer to the description of the indication information in the first aspect or the second aspect, and will not be repeated here.
  • the transmission rate of the time slot block can also refer to the description of the time slot block in the first aspect or the second aspect, and will not be repeated here.
  • an embodiment of the present application provides a device for transmitting data.
  • the device is used to execute the method provided in the first aspect or the third aspect.
  • the device for transmitting data may include a unit and/or module, such as a processing unit and an acquisition unit, for executing the method provided in any one of the above implementations of the first aspect or the third aspect.
  • the device for transmitting data is a transmitting end device.
  • the acquisition unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the device for transmitting data is a chip, a chip system or a circuit in a transmitting device.
  • the acquisition unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, the chip system or the circuit;
  • the processing unit may be at least one processor, a processing circuit or a logic circuit.
  • the beneficial effects of the method shown in the fifth aspect and its possible design can refer to the beneficial effects in the first aspect or the third aspect and its possible design.
  • an embodiment of the present application provides a device for transmitting data.
  • the device is used to execute the method provided in the second aspect or the fourth aspect above.
  • the device for transmitting data may include units and/or modules for executing the method provided in the second aspect or the fourth aspect, such as a processing unit and an acquisition unit.
  • the device for transmitting data is a receiving device.
  • the acquisition unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the device for transmitting data is a chip, a chip system or a circuit in a receiving device.
  • the acquisition unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, the chip system or the circuit;
  • the processing unit may be at least one processor, a processing circuit or a logic circuit.
  • an embodiment of the present application provides a processor for executing the methods provided in the above aspects.
  • an embodiment of the present application provides a computer-readable storage medium.
  • the computer-readable storage medium stores program codes for execution by a device, and the program codes include codes for executing the methods provided in the above aspects.
  • an embodiment of the present application provides a computer program product comprising instructions.
  • the computer program product is run on a computer, the computer is enabled to execute the methods provided in the above aspects.
  • an embodiment of the present application provides a chip, the chip includes a processor and a communication interface, the processor reads The instructions stored in the memory execute the methods provided by the above aspects.
  • the chip also includes a memory, in which a computer program or instruction is stored, and the processor is used to execute the computer program or instruction stored in the memory.
  • the processor is used to execute the methods provided by the above aspects.
  • an embodiment of the present application provides a communication system, comprising the device for transmitting data described in the fifth aspect and the device for transmitting data described in the sixth aspect.
  • FIG1 is a schematic diagram of an application scenario to which the present application is applicable.
  • FIG. 2 is a schematic diagram of the structure of an optical transmission device.
  • FIG. 3 is a schematic diagram of several possible structures of a signal frame in the present application.
  • FIG. 4 is a schematic diagram of an OTN frame structure.
  • FIG5 is a schematic flowchart of a method for transmitting data provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of an OTN frame structure provided in an embodiment of the present application.
  • FIG. 7 is a schematic diagram showing that business data occupies multiple time slot blocks.
  • FIG8 is a schematic diagram of another OTN frame structure provided in an embodiment of the present application.
  • FIG. 9 is a schematic diagram of another OTN frame structure provided in an embodiment of the present application.
  • FIG. 10 is a schematic diagram of another OTN frame structure provided in an embodiment of the present application.
  • FIG. 11 is a schematic diagram showing that business data occupies multiple time slot block groups.
  • FIG. 12 is a schematic diagram of the structure of a possible network device.
  • words such as “exemplary” or “for example” are used to indicate examples, illustrations or descriptions, and the embodiments or designs described as “exemplary” or “for example” should not be interpreted as being more preferred or more advantageous than other embodiments or designs.
  • the use of words such as “exemplary” or “for example” is intended to present related concepts in a specific way for easy understanding.
  • service data refers to services that can be carried by the optical transport network.
  • it can be Ethernet services, packet services, wireless backhaul services, etc.
  • Service data can also be called service signals, customer data, or customer service data. It should be understood that the types of service data are not limited in the embodiments of the present application.
  • used to indicate includes direct indication and indirect indication.
  • the information directly indicates A or indirectly indicates A, and does not mean that A must be carried in the information.
  • OTN optical transport network
  • MTN metropolitan transport network
  • a device may also be referred to as a node or a node device, and a sending device may be referred to as a sending node, a sending end, or a source node.
  • a receiving device may be referred to as a receiving end device, a receiving end, or a sink node.
  • FIG1 is a schematic diagram of an OTN optical network system applicable to an embodiment of the present application.
  • the technical solution of the embodiment of the present application can be applied to a communication system 100 including an OTN and multiple customer devices (customer device #1 to customer device #6 as shown in FIG1). It includes multiple interconnected OTN devices (such as OTN device #1 to OTN device #4 as shown in FIG1 ).
  • FIG1 only shows the OTN equipment used to connect the customer equipment. In actual applications, OTN may also include more equipment, which is not shown in FIG1. In addition, FIG1 does not show the specific connection relationship of the OTN equipment. Specifically, the connection method between OTN equipment can refer to the introduction in the current related technology, and this application does not elaborate on it.
  • OTN devices in an OTN network are connected by optical fibers and can be formed into different topology types such as linear, ring, and mesh according to specific needs.
  • the customer equipment may also be referred to as customer premises equipment (CPE).
  • CPE customer premises equipment
  • the specific form of the customer equipment is not limited in this application, including but not limited to: a terminal communicating with an OTN device, wherein the terminal may also be referred to as a terminal device, an access terminal, a user unit, a user station, a mobile station, a mobile device, a wireless communication device, a user agent or a user device.
  • the customer equipment may be a device that has service data to be transmitted.
  • OTN devices may have different functions.
  • OTN devices are divided into optical layer devices, electrical layer devices, and optoelectronic hybrid devices.
  • Optical layer devices refer to devices that can process optical layer signals, such as optical amplifiers (OA) and optical add-drop multiplexers (OADM).
  • OAs can also be called optical line amplifiers (OLA), which are mainly used to amplify optical signals to support longer distances while ensuring the specific performance of optical signals.
  • OOADM optical line amplifiers
  • OADM is used to transform optical signals in space so that they can be output from different output ports (sometimes also called directions).
  • OADM can be divided into fixed OADM (FOADM), reconfigurable OADM (ROADM), etc.
  • Electrical layer devices refer to devices that can process electrical layer signals, such as devices that can process OTN electrical signals.
  • Optoelectronic hybrid devices refer to devices that have the ability to process both optical layer signals and electrical layer signals.
  • an OTN device can integrate multiple different functions.
  • the technical solution provided in this application is applicable to OTN devices of different forms and integration levels, and is particularly applicable to OTN devices used to connect customer devices.
  • FIG2 is a schematic diagram of a possible hardware structure of a network device.
  • the optical transmission device shown in FIG2 is one of the OTN devices #1 to #4 in FIG1.
  • the OTN device 200 includes a branch board 201, a cross 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 quantity of boards included in the network device may be different.
  • a network device that serves as a core node does not have a branch board 201.
  • a network device that serves as an edge node has multiple branch boards 201, or does not have an optical cross 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 board 202 and the line board 203 are used to process the electrical layer signals of the OTN.
  • the tributary board 201 is used to realize the reception and transmission of various customer services, such as SDH services, packet services, Ethernet services and fronthaul services.
  • the tributary board 201 can be divided into a customer-side optical transceiver module and a signal processor.
  • the customer-side optical transceiver module can also be called an optical transceiver, which is used to receive and/or send service data.
  • the signal processor is used to realize the mapping and demapping processing of service data to data frames.
  • the cross board 202 is used to realize the exchange of data frames and complete the exchange of one or more types of data frames.
  • the line board 203 mainly realizes the processing of line-side data frames.
  • the line board 203 can be divided into a line-side optical module and a signal processor.
  • the line-side optical module can be called an optical transceiver, which is used to receive and/or send data frames.
  • the signal processor is used to realize the multiplexing and demultiplexing of the data frames on the line side, or the mapping and demapping processing.
  • the system control and communication type single board 204 is used to realize system control. Specifically, information can be collected from different boards, or control instructions can be sent to the corresponding board.
  • the specific components (such as signal processors) can be one or more, and this application does not limit this.
  • the network device may also include a power supply for backup, a fan for heat dissipation, etc.
  • the method provided in the embodiment of the present application can be applied to an optical transmission network, for example, the communication system shown in Figure 1.
  • the embodiment of the present application does not limit the scenario in which the method can be applied, for example, it is also applicable to other communication systems including devices that can implement corresponding functions (such as OTN devices or other communication devices).
  • the signal frame can specifically be a Flexible Optical Service Unit (OSUflex) frame (also referred to as an OSU frame for short), a Flexible Tributary Unit (TUflex) frame or an Optical Payload Unit k (OPUk) frame.
  • OSUflex Flexible Optical Service Unit
  • TUflex Flexible Tributary Unit
  • OSUflex Optical Payload Unit k
  • the OSUflex frame includes an overhead area and a payload area, and the payload area is used to carry customer services.
  • the OSUflex frame is used to map to the TUflex frame.
  • the TUflex frame includes multiple payload blocks (PB), and each OSUflex frame has a corresponding payload block.
  • PB payload blocks
  • each payload block includes a Tributary Port Number (TPN), which is used to Indicates the number of the service carried in the current payload block.
  • TPN Tributary Port Number
  • the payload area of the OPUk frame is divided into multiple payload blocks, and the payload block in the TUflex frame can be mapped to the payload area of the OPUk frame.
  • flexible optical service unit frame can also have other naming methods. For example, it can also be called a flexible optical service data unit (Flexible Optical Service data Unit, OSDUflex) frame, which is not limited here.
  • the signal frame in the present application may also be an optical data unit k (Optical Data Unit k, ODUk) frame or an optical transport unit k (Optical Transport Unit k, OTUk) frame, etc., which is not specifically limited here.
  • optical data unit k Optical Data Unit k, ODUk
  • optical transport unit k Optical Transport Unit k, OTUk
  • the OSU frame involved in the present application can be understood as a type of optical transport network (OTN) frame.
  • the data frame structure used by the OTN device is the OTN frame.
  • the OTN frame can also be called the OTN transmission frame.
  • the OTN frame is used to carry various service data and provide rich management and monitoring functions.
  • the OTN frame can be an OSU frame.
  • the OTN frame can also be an ODUk, ODUCn, ODUflex, or OTUk, OTUCn, or a flexible OTN (FlexO) frame, etc.
  • ODU frame includes ODU frame and OTU overhead
  • Cn represents variable rate, specifically a rate of positive integer multiples of 100Gbps.
  • ODU frame refers to any one of ODUk, ODUCn or ODUflex
  • OTU frame refers to any one of OTUk, OTUCn or FlexO.
  • the OTN frame structure is a 4-row multi-column structure, including an overhead area, a payload area, and a forward error correction (FEC) area.
  • the payload area of the OTN frame is divided into multiple payload blocks (PB).
  • PB payload blocks
  • Each PB occupies a fixed length (also called size) in the payload area.
  • the overhead that the OTN frame may include includes: a frame alignment signal (FAS), a multiframe indication signal (MFAS), and a reserved bit (RES) reserved for future international standardization, where FAS is used for frame alignment and FAS can be set to a fixed value.
  • FAS frame alignment signal
  • MFAS multiframe indication signal
  • RES reserved bit reserved for future international standardization
  • OTN frame structure is only an example.
  • Other variant OTN frames are also applicable to the present application.
  • an OTN frame that does not include an FEC area is another example.
  • PB can also be called a time slot, a time slot block, or a time slice, etc.
  • the present application does not restrict its name.
  • FIG. 4 is a schematic diagram of an OTN frame structure. It can be seen from Figure 4 that the frame structure of OTN can be a single-byte unit structure of 4 rows * 3824 columns, where the first 4 rows * 16 columns are the overhead area of the OTU/ODU/OPU, and 4 rows * (3824-16) columns are the OPU payload area. Among them, the payload area of the OTN frame is divided into multiple PBs. Each PB occupies a fixed length (also called size) in the payload area, for example, 128 bytes.
  • the overhead area of the OTN frame includes FAS, which is used for frame alignment, etc.
  • the OSU currently developed by the China Communications Standards Association (CCSA) is used to carry small-granularity services in the OTN network, and the International Telecommunications Union-Telecommunication Standardization Sector (ITU-T) is also discussing the OSU standard solution.
  • CCSA China Communications Standards Association
  • ITU-T International Telecommunications Union-Telecommunication Standardization Sector
  • multiple services are mapped and encapsulated into multiple OSUs, different OSUs correspond to different flexible tributary units, and then multiple TUflexes are multiplexed into the OPU.
  • the payload area of the OSU includes a 192-byte PB
  • the overhead area of the OSU includes 7 bytes, wherein the last byte of the 7-byte overhead area is a CRC-8 check field, which is used to check the first 6 bytes. Once the check fails, the content of the 192-byte payload block is discarded. The bit error is expanded to data loss, which affects the reliability of data transmission.
  • the embodiments shown below do not particularly limit the specific structure of the execution subject of the method provided in the embodiments of the present application.
  • the execution subject of the method provided in the embodiments of the present application may be an OTN device, or an OTN device that can call a program.
  • a functional module that executes the program (such as a chip or a chip system, etc.), or it can also be other communication devices.
  • FIG5 is a schematic flow chart of a method for transmitting data provided in the present application, which includes the following steps.
  • S610 The sending end device receives service data and maps the service data to an OTN frame.
  • the OTN frame is used to carry service data.
  • a transmitting end device obtains service data to be transmitted, maps the service data to a payload area of the OTN frame, and transmits the OTN frame to complete the transmission of the service data.
  • the sending end device is the above-mentioned OTN device (such as OTN device #1 as shown in FIG. 1), which receives service data from a client device (such as client device #1 or client device #2 as shown in FIG. 1).
  • the sending end device is other devices that can implement the functions of the OTN device.
  • the service data involved in the embodiments of the present application refers to services that can be carried by the optical transport network, including but not limited to: Ethernet services, packet services, wireless backhaul services, etc. It should be understood that the types of service data are not limited in the embodiments of the present application.
  • this embodiment does not specifically describe how to map service data to the payload area of the OTN frame. For details, reference may be made to the introduction in the current related technology. This embodiment mainly involves how to define the meaning of different bits in the overhead area of the OTN frame.
  • the OTN frame may be a currently defined OTN frame or a metro transport network (MTN) frame.
  • MTN metro transport network
  • the payload area of the OTN frame can be divided into time slot blocks (or referred to as payload blocks, time slots, etc.) with a small bandwidth.
  • it can be divided into time slot blocks of 8 bytes, time slot blocks of 16 bytes, time slot blocks of 32 bytes, 64 bytes, etc.
  • time slot blocks of 8 bytes
  • time slot blocks of 16 bytes
  • time slot blocks of 32 bytes
  • 64 bytes etc.
  • the specific division method of the payload area of the OTN frame is not limited in this embodiment, and will not be described one by one here.
  • the following two methods can be used to indicate whether the object carried by the time slot block is data or padding, thereby realizing rate adaptation control.
  • Method 1 directly indicating that the object carried by the time slot block is data or padding.
  • the overhead area of the OTN frame includes a group of continuous indication information
  • the payload area of the OTN frame includes a group of time slot blocks
  • the group of continuous indication information is used to indicate that the object carried by the group of time slot blocks is data or padding.
  • a group of continuous indication information is located in at least one row in the overhead area of the OTN frame
  • a group of time slot blocks is located in at least one row in the payload area of the OTN frame
  • at least one row where a group of indication information is located is before at least one row where a group of time slot blocks are located.
  • At least one row where a group of indication information is located can be called at least one first row, that is, the row where the indication information is located in this embodiment can be called "first row”, and multiple first rows can be multiple different rows; at least one row where a group of time slot blocks is located can be called at least one second row, that is, the row where the time slot blocks are located in this embodiment can be called "second row”, and multiple second rows can be multiple different rows.
  • a group of continuous indication information and a group of time slot blocks are in the same frame, it can be determined that at least one first row is before at least one second row through the relationship between row numbers, such as, if multiple rows of the OTN frame are numbered from small to large, then the row number of at least one first row is smaller than the row number of the second row; or, if multiple rows of the OTN frame are numbered from large to small, then the row number of at least one first row is larger than the row number of the second row.
  • a group of continuous indication information and a group of time slot blocks are not in the same frame, such as, a group of time slot blocks are located in multiple second rows, at least one second row of the multiple second rows is located in frame #2, at least one first row is located in frame #1, and frame #2 is after frame #1. It can be understood that a group of continuous indication information is used to indicate that the objects carried by a group of time slot blocks after the group of continuous indication information are data or padding.
  • multiple indication information is defined in the overhead area of the OTN frame, and the multiple indication information is used to indicate that the objects carried by multiple time slot blocks located after the multiple indication information in the payload area of the OTN frame (for example, the row where the indication information is located is before the row where the time slot block is located) are data or padding. Indicating that a certain time slot block is data or padding is to indicate whether the time slot block is a time slot block carrying data or a padding block, so that the receiving end device can parse the received OTN frame, that is, the method for transmitting data can complete the rate adaptation control of multiple time slot blocks divided in the OTN frame.
  • the payload area of the OTN frame includes multiple time slot blocks, and the time slot blocks in the multiple time slot blocks are time slot blocks in Y time slot block periods, and each time slot block period in the Y time slot block periods includes y time slot blocks, wherein Y is an integer greater than or equal to 1, y is an integer greater than 1, and the y time slot blocks in each time slot block period are sequentially numbered from 1 to y.
  • the overhead area of the OTN frame includes y indication information.
  • Each indication information in the y indication information is used to indicate that the object carried by the corresponding time slot block is data or padding.
  • the i-th indication information in the y indication information is used to indicate that the object carried by time slot block #i is data or padding, which can be understood as the i-th indication information corresponding to time slot block #i.
  • the i-th indication information is the y indication information numbered i, and the indication information numbered i is used
  • the object carried by the time slot block numbered i is indicated as data or padding, and the time slot block numbered i is the time slot block numbered i after the indication information numbered i (e.g., one after the first or i-th indication information).
  • each of the Y time slot block periods includes a time slot block numbered i, and there are a total of Y time slot blocks numbered i, but the indication information numbered i only indicates that the object carried by the time slot block numbered i after the indication information numbered i is data or padding, and the objects carried by the other Y-1 time slot blocks numbered i are data.
  • the indication of whether the object carried by the time slot block is data or padding involved in this embodiment can also be understood as an indication of rate adaptation for the time slot block.
  • the reason is that the receiving end device can determine whether the object carried by the corresponding time slot block is data or padding based on the indication information, and determine whether the time slot block is a rate adaptation block.
  • the number Y of time slot block periods is related to the size of each time slot block, the size of the payload area of the OTN frame, the transmission rate of the OTN frame, the transmission rate of each time slot block, and the size of the service data to be transmitted.
  • no limitation is imposed on the service data to be transmitted, and thus no limitation is imposed on the number Y of time slot block periods.
  • the number of time slot blocks y included in each time slot block period is related to the size of each time slot block, the size of the payload area of the OTN frame, the transmission rate of the OTN frame, and the transmission rate of each time slot block.
  • the size of the payload area of the OTN frame is as shown in Figure 4, from 17 bytes to 3824 bytes, which are all the payload areas of the OTN frame.
  • the size of each time slot block is 16 bytes. From the size point of view, 17 bytes to 3824 bytes can be divided into 238 time slot blocks of 16 bytes.
  • the transmission rate of each time slot block is defined as 10.4Mbit/s
  • the transmission rate of the OTN frame is 1238.95431Mbit/s
  • the OTN frame can be divided into 119 time slot blocks with a transmission rate of 10.4Mbit/s, so that 17 bytes to 3824 bytes can be divided into two time slot block periods, and each time slot block period includes 119 time slot blocks.
  • the size of the payload area of the data frame is shown in Figure 4, from 17 bytes to 3824 bytes, which are all the payload areas of the OTN frame.
  • the size of each time slot block is 16 bytes. From the size point of view, 17 bytes to 3824 bytes can be divided into 238 time slot blocks of 16 bytes.
  • the transmission rate of each time slot block is defined as 10.4Mbit/s, and the transmission rate of the OTN frame is 2.5G bit/s, then from the transmission rate point of view, the OTN frame can be divided into 238 time slot blocks with a transmission rate of 10.4Mbit/s, so that 17 bytes to 3824 bytes can be divided into 1 time slot block period, and the time slot block period includes 238 time slot blocks.
  • the number of indication information y is equal to the number of time slot blocks included in each time slot block period y.
  • each time slot block period includes 119 time slot blocks, and the overhead area of the OTN frame includes 119 indication information.
  • each time slot block period includes 238 time slot blocks, and the overhead area of the OTN frame includes 238 indication information.
  • the above-mentioned group of time slot blocks may be multiple time slot blocks in a certain time slot block period, and a group of continuous indication information is the indication information corresponding to the multiple time slot blocks and located before the multiple continuous time slot blocks in the y indication information.
  • a group of time slot blocks is 16 time slot blocks numbered 1 to 16 in the first time slot block period
  • a group of continuous indication information is 16 continuous indication information numbered 1 to 16 before the 16 time slot blocks
  • the group of continuous indication information is M bits in different columns from the jth to the j+M-1th rows in the OTN frame
  • the first time slot block period is located in the M+Nth row in the OTN frame
  • M is a positive integer.
  • the number of bits occupied by each indication information in the above set of indication information is multiple.
  • the first indication information in a set of continuous indication information includes multiple bits, and the multiple bits are multiple bits of the same column of the jth to j+M-1th rows of the overhead area of the OTN frame, and the first indication information is used to indicate that the object carried by the first time slot block in a set of time slot blocks is data or padding, wherein the position of the first time slot block in the set of time slot blocks is the same as the position of the first indication information in a set of continuous indication information.
  • the number of bits occupied by each indication information in the above set of indication information is one.
  • the number of bits occupied by the indication information is not limited and may be at least one.
  • the reliability of the scheme can be improved by majority judgment; when the number of bits occupied by the indication information is less than 3, the reliability of the scheme can be improved by adding a verification code.
  • the first indication information occupies multiple bits, and the first indication information is used to indicate that the object carried by the first time slot block is data or padding, including: the value of more than half of the bits in the multiple bits is 0, indicating that the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is padding; or, the value of more than half of the bits in the multiple bits is 1, indicating that the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is padding. For example, if the first indication information occupies 3 bits, and the value of more than 2 bits is 1, then the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is padding.
  • the first indication information occupies 1 bit, and the first indication information can be verified by adding a verification code.
  • the first indication information passes the verification by verifying the verification code, and the value of the 1 bit is 1, then the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is padding.
  • time slot blocks occupied by the service data can be used.
  • a fixed time slot block is used for rate adaptation, and the adaptation positions of other time slot blocks are fixed as data, that is, the indication information indicates that the object carried by one of the time slot blocks (such as the last time slot block or any time slot block) is data or filler, and the objects carried by other time slot blocks are data.
  • the indication information can be used to indicate that the object carried by one of the multiple time slot blocks is data or filler, and the objects carried by other time slot blocks are data (no indication is required for the other time slot blocks, or fixed indication is data), which can further reduce the indication overhead.
  • the time slot blocks occupied by the service data include the first time slot block and the time slot blocks other than the first time slot block, then the first indication information is used to indicate that the object carried by the first time slot block is data or filler, and the objects carried by other time slot blocks are data.
  • the object carried by the other time slot blocks as data can also be indicated by the indication information corresponding to the other time slot blocks, or it can be predefined, which is not limited in this embodiment.
  • the above-mentioned set of continuous indication information is a set of continuous indication information included in the first frame indicated by the multiframe alignment signal MFAS in the overhead area of the OTN frame, wherein the first frame is one of at least one frame indicated by the MFAS, and each frame in the at least one frame includes at least one indication information.
  • the rate adaptation control of multiple time slot blocks can be completed in one frame, thereby improving the control efficiency.
  • the 119 indication information can be divided into 8 groups of continuous indication information, such as, indication information numbered 1 to 16 is a group, indication information numbered 17 to 32 is a group, indication information numbered 33 to 48 is a group, indication information numbered 49 to 64 is a group, indication information numbered 65 to 80 is a group, indication information numbered 81 to 96 is a group, indication information numbered 97 to 112 is a group, and indication information numbered 113 to 119 is a group, and the 8 groups of continuous indication information are divided into 8 frames through MFAS (for example, 6 to 8 bits of MFAS are divided into 8 frames, and some bits in the 8th frame are reserved bits) and transmitted separately.
  • MFAS for example, 6 to 8 bits of MFAS are divided into 8 frames, and some bits in the 8th frame are reserved bits
  • the 238 indication information can be divided into 15 groups of continuous indication information, such as, indication information numbered 1 to 16 is a group, indication information numbered 17 to 32 is a group, indication information numbered 33 to 48 is a group, indication information numbered 49 to 64 is a group, indication information numbered 65 to 80 is a group, indication information numbered 81 to 96 is a group, indication information numbered 97 to 112 is a group, indication information numbered 113 to 128 is a group, indication information numbered 129 to 144 is a group, indication information numbered 145 to 160 is a group...
  • indication information numbered 225 to 238 is a group, and the 15 groups of continuous indication information are divided into 15 frames (such as 5 to 8 bits of MFAS are divided into 16 frames, and the 16th frame is a reserved bit) through MFAS and transmitted separately.
  • the y time slot blocks included in each time slot block period may be divided into multiple time slot block groups.
  • the time slot blocks numbered 1 to y/2 in the y time slot blocks are one time slot block group, and the time slot blocks numbered y/2+1 to y are another time slot block group.
  • the overhead area of the OTN frame also includes second indication information for indicating the time slot block group to which the indicated time slot block belongs.
  • the second indication information may be an optical payload unit multi-frame indicator (OPU Multi-Frame Identifier, OMFI).
  • OPU Multi-Frame Identifier OPU Multi-Frame Identifier
  • the 238 time slot blocks may be divided into two groups of time slot block groups, wherein time slot block group #1 includes 119 time slot blocks numbered from 1 to 119, and time slot block group #2 includes 119 time slot blocks numbered from 120 to 238.
  • the frame structure of the OTN frame shown in the above-mentioned method 1 (eg, the overhead area includes a group of continuous indication information, and the payload area includes a group of time slot blocks) is described below in conjunction with Examples 1 to 3.
  • Example 1 A 16-byte time slot block is defined in the OPU payload area, and the rate of the 16-byte time slot block is defined to be approximately 10.4M, then the OPU (1.25G bit/s) is divided into 119 time slot blocks, that is, each time slot block period includes 119 time slot blocks.
  • Example 1 it can be seen from the OTN frame structure shown in Figure 4 above that the MFAS included in the OTN frame overhead can occupy 2 bytes (such as the 6th and 7th bytes shown in Figure 4). Specifically, the 6th to 8th bits of the MFAS in Example 1 are divided into 8 frames to respectively transmit the indication information of the 119 time slot blocks in a time slot block cycle.
  • FIG6 is a schematic diagram of an OTN frame structure provided by an embodiment of the present application.
  • the number of bits included in the indication information is 3 (e.g., the vertical 3 bits of the 1st to 3rd rows of the OPU overhead shown in FIG6), wherein the indication information can be called Justification Control (JC).
  • JC Justification Control
  • the three JC1s shown in FIG. 6 are used to indicate the object carried by the first time slot block numbered 1 in the fourth row of the payload area. For data or padding.
  • the three JC119s shown in FIG. 6 are used to indicate that the object carried by the first time slot block numbered 119 in the fourth row of the payload area is data or padding.
  • a fixed time slot block of the service data is used for rate adaptation, that is, the object carried by the time slot block is indicated by the indication information as data or padding.
  • the objects carried by other time slot blocks except the fixed time slot block are data.
  • a service occupies the first time slot block and the second time slot block, the object carried by the first time slot block is data, and the object carried by the second time slot block is data or padding, which is indicated by the indication information corresponding to the second time slot block.
  • the indication information JC1 corresponding to the first time slot block may not need to be defined, or may be defined to indicate that the object carried is data, and the indication information JC2 corresponding to the second time slot block is used to indicate that the object carried by the second time slot block is data or padding.
  • Example 2 A 16-byte time slot block is defined in the OPU payload area, and the rate of the 16-byte time slot block is defined to be approximately 10.4M, then the OPU (2.5Gbit/s) is divided into 238 time slot blocks, that is, each time slot block period includes 238 time slot blocks.
  • Example 2 it can be seen from the OTN frame structure shown in Figure 4 above that the MFAS included in the OTN frame overhead can occupy 2 bytes (such as the 6th and 7th bytes shown in Figure 4). Specifically, the 6th to 8th bits of the MFAS in Example 2 are divided into 8 frames to respectively transmit the indication information of the 119 time slot blocks in a time slot block cycle, and the 238 time slot blocks are divided into two groups of 119 time slot blocks in combination with the OMFI field.
  • FIG8 is a schematic diagram of another OTN frame structure provided by an embodiment of the present application.
  • the number of bits of the indication information is 3 (e.g., the vertical 3 bits of the 1st to 3rd rows of the OPU overhead shown in FIG8 ).
  • OMFI is used to indicate which group of 119 time slot blocks the indication information transmitted by the 6 to 8 bits of MFAS in 8 frames is.
  • the three JC1s shown in FIG8 are used to indicate that the object carried by the first time slot block numbered 1 in the fourth row of the payload area is data or padding.
  • the three JC238s shown in FIG8 are used to indicate that the object carried by the first time slot block numbered 238 in the fourth row of the payload area is data or padding.
  • Example 3 A 16-byte time slot block is defined in the OPU payload area, and the rate of the 16-byte time slot block is defined to be approximately 10.4M, then the OPU (2.5Gbit/s) is divided into 238 time slot blocks, that is, each time slot block period includes 238 time slot blocks.
  • Example 3 it can be seen from the OTN frame structure shown in Figure 4 above that the MFAS included in the OTN frame overhead can occupy 2 bytes (such as the 6th and 7th bytes shown in Figure 4). Specifically, the 5 to 8 bits of the MFAS in Example 2 are divided into 16 frames to respectively transmit the indication information of the 238 time slot blocks in a time slot block cycle.
  • FIG9 is a schematic diagram of another OTN frame structure provided by an embodiment of the present application.
  • the number of bits included in the indication information is 3 (e.g., the vertical 3 bits of the 1st to 3rd rows of the OPU overhead shown in FIG9).
  • a group of continuous indication information shown in the first mode respectively indicates that the objects carried by a group of time slot blocks are data or filler.
  • a group of time slot blocks is a group of time slot blocks in multiple rows after a group of continuous indication information (for example, the time slot block size is 8 bytes, the OPU is divided into 476 time slot blocks, a group of continuous indication information is JC232 to JC248, and the indicated group of time slot blocks: time slot block #232 to time slot block #248 are in different rows). Examples are not given one by one here.
  • Method 2 By indicating the change in the amount of data carried by a time slot block group (a plurality of time slot blocks), it is indicated that the objects carried by the time slot blocks in the time slot block group are data or padding.
  • the overhead area of the first cycle of the OTN frame includes multiple continuous indication information
  • the payload area of the second cycle of the OTN frame includes multiple time slot block groups
  • the multiple continuous indication information is used to indicate the change in the amount of data carried by each time slot block group in the multiple time slot block groups.
  • the second cycle is the next cycle of the first cycle, each time slot block group in the multiple time slot block groups includes multiple time slot blocks, and the positions of the multiple time slot blocks in the multiple time slot block cycles are the same. It can be understood that the multiple indication information in the current cycle is used to indicate Indicates the change in the amount of data carried by multiple time slot block groups in the next cycle.
  • multiple indication information is defined in the overhead area of the current cycle of the OTN frame, and the multiple indication information is used to indicate the change in the amount of data carried by multiple time slot block groups in the payload area of the next cycle of the OTN frame.
  • the change in the amount of data carried by a certain time slot block group is indicated to determine whether the objects carried by the multiple time slot blocks included in the time slot block are data or padding, so as to facilitate the receiving end device to parse the received OTN frame, that is, the method for transmitting data can complete the rate adaptation control of the multiple time slot blocks divided in the OTN frame.
  • the payload area of the second cycle of the OTN frame includes multiple time slot blocks, and the time slot blocks in the multiple time slot blocks are time slot blocks in Y1 time slot block periods, and each time slot block period in the Y1 time slot block periods includes y1 time slot blocks, wherein Y1 is an integer greater than or equal to 1, y1 is an integer greater than 1, and the y1 time slot blocks in each time slot block period are numbered sequentially from 1 to y1.
  • the time slot blocks numbered i1 in each time slot block period form a time slot block group, where i1 is an integer greater than or equal to 1 and less than or equal to y1.
  • time slot group #i1 is a time slot group composed of time slot blocks #i1 in Y1 time slot block periods.
  • the overhead area of the first period of the OTN frame includes y1 indication information.
  • Each indication information in the Y1 indication information is used to indicate the change in the amount of data carried by the corresponding time slot block group.
  • the i1th indication information in the y1 indication information is used to indicate the change in the amount of data carried by the time slot block group #i, which can be understood as the i-th indication information corresponding to the time slot block group #i1.
  • the indication information in this embodiment indicates the change in the amount of data carried by the corresponding time slot block group.
  • the basic amount of data carried by the time slot block group may be pre-configured or determined by negotiation between the transmitting device and the receiving device, which is not limited in this embodiment.
  • a time slot block group includes 64 time slot blocks, and the basic amount of data carried by the time slot block group may be 62, indicating that 62 of the 64 time slot blocks carry data. If the indication information corresponding to the time slot block group indicates that the change in the amount of data carried by the time slot block group is 1, it proves that 63 of the 64 time slot blocks actually carry data.
  • the change in the amount of data carried by the time slot block group involved in this embodiment can be understood as indicating that the object carried by the time slot blocks included in the time slot block group is data or padding, and can also be understood as indicating rate adaptation of the time slot block.
  • the reason is that the receiving end device can determine whether the object carried by the corresponding time slot block is data or padding based on the indication information, and determine whether the time slot block is a rate adaptation block.
  • the amount of data carried and the arrangement in the time slot block group can be obtained by an algorithm (such as ⁇ - ⁇ ), wherein the arrangement refers to which time slot blocks in the time slot group the amount of data carried by the time slot block group is carried on.
  • an algorithm such as ⁇ - ⁇
  • the specific method for determining the arrangement is not limited in this embodiment.
  • the number of time slot block periods Y1 and the number of time slot blocks y1 included in each time slot block period can refer to the description of the number of time slot block periods Y and the number of time slot blocks y in method 1, and will not be repeated here.
  • the above-mentioned multiple time slot block groups may be multiple time slot block groups composed of time slot blocks at the same position in each time slot block period in Y1 time slot block periods, and the multiple continuous indication information is the indication information corresponding to the multiple time slot block groups in the y1 indication information.
  • the multiple time slot block groups are a time slot block group composed of 64 time slot blocks numbered 1 in 64 time slot block periods in period #1, a time slot block group composed of 64 time slot blocks numbered 2, a time slot block group composed of 64 time slot blocks numbered 3, ..., and a time slot block group composed of 64 time slot blocks numbered 16.
  • the multiple continuous indication information is 16 continuous indication information numbered 1 to 16 in the period before the period #1, and the multiple continuous indication information is M2 bits in different columns of the j 1th to j1+M2-1th rows in the OTN frame, where M2 is a positive integer.
  • the number of bits occupied by each indication information in the above-mentioned multiple indication information is multiple.
  • the third indication information in multiple consecutive indication information includes multiple bits, and the multiple bits are multiple bits of the same column of at least one row of the overhead area of the OTN frame, and the third indication information is used to indicate the change in the amount of data carried by the first time slot block group in multiple time slot block groups, wherein the position of the first time slot block group in the multiple time slot block groups is the same as the position of the third indication information in the multiple consecutive indication information.
  • the first time slot block group is the i-th time slot block group in the multiple time slot block groups
  • the third indication information is the i-th indication information in the multiple consecutive indication information.
  • each of the plurality of indication information occupies one bit.
  • the number of bits occupied by the indication information there is no limitation on the number of bits occupied by the indication information, which may be at least one.
  • the reliability of the scheme can be improved by majority judgment; when the number of bits occupied by the indication information is less than 3, the reliability of the scheme can be improved by adding a verification code.
  • the third indication information occupies a plurality of bits, and the third indication information is used to indicate the change in the amount of data carried by the first time slot block group, including: the value of more than half of the bits in the plurality of bits is 0, indicating that the change in the amount of data carried by the first time slot block group is 0, otherwise, indicating that the change in the amount of data carried by the first time slot block group is 1; or, the value of more than half of the bits in the plurality of bits is 1, indicating that the change in the amount of data carried by the first time slot block group is 1, otherwise, indicating that the change in the amount of data carried by the first time slot block group is 0.
  • the third indication information occupies 3 bits, and if more than 2 bits have a value of 1, the change in the amount of data carried by the first time slot block group is 1, otherwise the change in the amount of data carried by the first time slot block group is 0.
  • the third indication information occupies 1 bit, and the third indication information can be verified to be credible by adding a verification code.
  • the third indication information is determined to have passed the verification by verifying the verification code, and the value of the 1 bit is 1, the change in the amount of data carried by the first time slot block group is 1, otherwise the change in the amount of data carried by the first time slot block group is 0.
  • the time slot blocks occupied by a certain service data include at least two time slot block groups
  • at least one of the indication information corresponding to the multiple time slot block groups can be used to indicate the change in the amount of data of the at least two time slot block groups, thereby further reducing the indication overhead.
  • the time slot blocks occupied by the service data include time slot block group #1 and time slot block group #2
  • the time slot block group #1 and time slot block group #2 correspond to indication information #1 and indication information #2, respectively
  • the change in the amount of data carried by the time slot block group #1 and the time slot block group #2 can be indicated by at least one of the indication information #1 and the indication information #2.
  • the time slot block group #1 includes 64 time slot blocks #1 and the time slot block group #2 includes 64 time slot blocks #2, then at least one of the indication information #1 and the indication information #2 can be used to determine whether the objects carried by the 128 time slot blocks are data or padding.
  • the above-mentioned multiple continuous indication information is multiple continuous indication information included in the first frame indicated by the multiframe alignment signal MFAS in the overhead area of the OTN frame, wherein the first frame is one of at least one frame indicated by the MFAS, and each frame in the at least one frame includes at least one indication information.
  • the frame structure of the OTN frame shown in the above-mentioned method 2 (eg, the overhead area of the first cycle includes multiple continuous indication information, and the payload area of the second cycle includes multiple time slot block groups) is explained below in conjunction with Example 4.
  • Example 4 A 16-byte time slot block is defined in the OPU payload area, and the 16-byte time slot block rate is defined to be approximately 10.4M, then the OPU (1.25Gbit/s) is divided into 119 time slot blocks, that is, each time slot block period includes 119 time slot blocks.
  • Example 4 it can be seen from the OTN frame structure shown in FIG. 4 above that the MFAS included in the OTN frame overhead can occupy 2 bytes (e.g., the 6th and 7th bytes shown in FIG. 4). Specifically, the 6 to 8 bits of the MFAS in Example 4 are divided into 8 frames to respectively transmit the indication information of 119 time slot blocks in a time slot block cycle, and the indication information of 119 time slot blocks in another time slot block cycle can be transmitted again through the 6 to 8 bits of the MFAS divided into 8 frames.
  • the 6 to 8 bits of the MFAS in Example 4 are divided into 8 frames to respectively transmit the indication information of 119 time slot blocks in a time slot block cycle, and the indication information of 119 time slot blocks in another time slot block cycle can be transmitted again through the 6 to 8 bits of the MFAS divided into 8 frames.
  • FIG10 is a schematic diagram of another OTN frame structure provided by an embodiment of the present application.
  • the number of bits included in the indication information is 3 (e.g., the vertical 3 bits of the 1st to 3rd rows of the OPU overhead shown in FIG10), where the indication information can be called JC.
  • the three JC1s in cycle #1 shown in FIG. 10 are used to indicate the change in the amount of data carried by time slot block group #1 consisting of 64 time slot blocks numbered 1 in the payload area in cycle #2.
  • the three JC119s in cycle #1 shown in FIG10 are used to indicate the change in the amount of data carried by time slot group #119 consisting of 64 time slot blocks numbered 119 in the payload area of cycle #2.
  • time slot block groups with other OPU frames e.g., 2.5 Gbit/s
  • a certain service data occupies at least two time slot block groups
  • at least one of the indication information corresponding to the at least two time slot block groups is used to indicate the change in the data volume of the at least two time slot block groups.
  • a service occupies time slot block groups #1 and #2.
  • the 128 time slot blocks included in time slot block groups #1 and #2 (such as 64 time slot blocks 1 and 64 time slot blocks 2 as shown in FIG11 ) can be understood as a time slot block group.
  • the change in the data volume carried by the time slot block group can be indicated by JC1 and/or JC2.
  • the transmitting end device maps the service data into the OTN frame
  • the OTN frame may be sent to the receiving end device.
  • the method flow shown in FIG5 further includes:
  • S620 The transmitting device sends an OTN frame to the receiving device.
  • the transmission method of the OTN frame is not limited in this embodiment, and the current transmission process of the OTN frame can be referred to, which will not be described here.
  • it can be the mapping process shown in Figure 3.
  • the difference from the mapping process shown in Figure 3 lies in the definition of the overhead area bit information in the OTN frame and the definition of the time slot block in the payload area of the OTN frame.
  • the receiving end device can determine through majority decision whether the object carried by the time slot block indicated by the indication information is data or padding.
  • the i-th indication information is used to indicate that the object carried by the first time slot block is data or padding, including: the M1 bit in the M bits is 0 to indicate that the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is Filling; or, the M1 bit in the M bits has a value of 1 to indicate that the object carried by the first time slot block is data, otherwise the object carried by the first time slot block is filling, where M1 is equal to M, or M1 is greater than or equal to Indicates rounding up.
  • the receiving end device can determine the change in the amount of data carried by the time slot block group indicated by the indication information by majority decision.
  • the i1th indication information is used to indicate the change in the amount of data carried by the first time slot block group, including: the M3 bit in the M2 bits is 0, indicating that the change in the amount of data carried by the first time slot block group is 0, otherwise the change in the amount of data carried by the first time slot block group is 1; or,
  • the M3 bit in the M2 bits is set to 1 to indicate that the change in the amount of data carried by the first time slot block group is 1, otherwise the change in the amount of data carried by the first time slot block group is 0, wherein M3 is equal to M2, or M3 is greater than or equal to Indicates rounding up.
  • the devices in the existing network architecture are mainly used as examples for exemplary description (such as OTN devices). It should be understood that the embodiments of the present application do not limit the specific form of the devices. For example, devices that can achieve the same function in the future are applicable to the embodiments of the present application.
  • the methods and operations implemented by devices can also be implemented by components that can be used in devices (such as chips or circuits).
  • the above is a detailed description of the method for transmitting data provided by the embodiment of the present application in conjunction with Figures 5-11.
  • the above method is mainly introduced from the perspective of interaction between the receiving device and the sending device. It can be understood that the receiving device and the sending device, in order to implement the above functions, include hardware structures and/or software modules corresponding to the execution of each function.
  • the embodiment of the present application can divide the functional modules of the transmitting end device or the receiving end device according to the above method example.
  • each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module.
  • the above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation. The following is an example of dividing each functional module corresponding to each function.
  • FIG12 is a schematic diagram of the structure of a possible network device.
  • the network device 1300 includes a processor 1301, an optical transceiver 1302, and a memory 1303. Among them, the memory 1303 is optional.
  • the network device 1300 can be applied to both a sending side device (e.g., the network device 1300 can be the above-mentioned sending end device) and a receiving side device (e.g., the network device 1300 can be the above-mentioned receiving end device).
  • the processor 1301 and the optical transceiver 1302 are used to implement the method performed by the sending end device shown in FIG5.
  • each step of the processing flow can be completed by the hardware integrated logic circuit or software instructions in the processor 1301 to complete the method performed by the sending device in the above figure.
  • the optical transceiver 1302 is used to receive the OTN frame sent by the processor to send it to the opposite end device (also called the receiving end device).
  • the processor 1301 and the optical transceiver 1302 are used to implement the method performed by the receiving device shown in FIG. 5.
  • each step of the processing flow can be completed by the hardware integrated logic circuit in the processor 1301 or the instructions in the form of software to complete the method performed by the receiving device described in the above figure.
  • the optical transceiver 1302 is used to receive the opposite end device (also called The OTN frame sent by the transmitting end device is sent to the processor 1301 for subsequent processing.
  • the memory 1303 is used to store instructions so that the processor 1301 can be used to perform the steps mentioned in the above figure. And/or, the memory 1303 is used to store other instructions to configure the parameters of the processor 1301 to implement the corresponding functions.
  • processor 1301 and the memory 1303 may be located in a branch board in the network device hardware structure diagram shown in FIG2 ; or may be located in a single board that integrates the branch and the line.
  • the processor 1301 and the memory 1303 both include multiple ones, which are located in the branch board and the line board respectively, and the two boards cooperate to complete the aforementioned method steps.
  • FIG. 12 can also be used to execute the method steps involved in the embodiment variations shown in the aforementioned figures, which will not be described in detail here.
  • the embodiments of the present application further provide a computer-readable storage medium.
  • the storage medium stores a software program, and the software program can implement the method provided by any one or more of the above embodiments when read and executed by one or more processors.
  • the computer-readable storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and other media that can store program codes.
  • the embodiments of the present application further provide a chip.
  • the chip includes a processor for implementing the functions involved in any one or more of the above embodiments, such as acquiring or processing the OTN frames involved in the above methods.
  • the chip also includes a memory, which is used for the processor to execute necessary program instructions and data.
  • the chip can be composed of a chip, or it can include a chip and other discrete devices.
  • processors mentioned in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.
  • the memory mentioned in the embodiments of the present application may be a volatile memory and/or a non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory.
  • the volatile memory may be a random access memory (RAM).
  • a RAM may be used as an external cache.
  • RAM may include the following forms: static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM) and direct RAM bus RAM (DR RAM).
  • SRAM static RAM
  • DRAM dynamic RAM
  • SDRAM synchronous DRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced SDRAM
  • SLDRAM synchronous link DRAM
  • DR RAM direct RAM bus RAM
  • the disclosed devices and methods can be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement the solution provided by the present application.
  • each functional unit in each embodiment of the present application may be integrated into one unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer can be a personal computer, a server, or a network device, etc.
  • the computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center.
  • the computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media integrations.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)).
  • the aforementioned available medium may include, but is not limited to: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

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

Abstract

La présente demande concerne un procédé de transmission de données. Le procédé comprend les étapes suivantes : un dispositif d'extrémité d'envoi reçoit des données de service, apparie les données de service avec une trame OTN et envoie finalement la trame OTN à un dispositif d'extrémité de réception, une zone de surdébit de la trame OTN comprenant un groupe d'informations d'indication et le groupe d'informations d'indication étant respectivement utilisé pour indiquer qu'un objet porté par un groupe de blocs d'intervalles de temps inclus dans une zone de débit de la trame OTN est une donnée ou un remplissage. En définissant, dans une zone de surdébit d'une trame OTN, les informations d'indication d'un objet porté par une pluralité de blocs d'intervalles de temps, une commande d'adaptation de débit de la pluralité de blocs d'intervalles de temps, qui sont divisés dans la trame OTN, est réalisée.
PCT/CN2023/122564 2022-11-22 2023-09-28 Procédé et appareil de transmission de données WO2024109349A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110135304A1 (en) * 2009-12-07 2011-06-09 Fujitsu Limited Transmission apparatus and signal mapping method
CN112511921A (zh) * 2020-03-27 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
CN113630206A (zh) * 2020-05-08 2021-11-09 中兴通讯股份有限公司 业务处理方法、装置、网络设备和存储介质
CN114915375A (zh) * 2022-04-27 2022-08-16 烽火通信科技股份有限公司 一种业务映射的实现方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110135304A1 (en) * 2009-12-07 2011-06-09 Fujitsu Limited Transmission apparatus and signal mapping method
CN112511921A (zh) * 2020-03-27 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
CN113630206A (zh) * 2020-05-08 2021-11-09 中兴通讯股份有限公司 业务处理方法、装置、网络设备和存储介质
CN114915375A (zh) * 2022-04-27 2022-08-16 烽火通信科技股份有限公司 一种业务映射的实现方法和装置

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