WO2020034964A1

WO2020034964A1 - Client service data transmission method and apparatus, and optical transport network device and storage medium

Info

Publication number: WO2020034964A1
Application number: PCT/CN2019/100430
Authority: WO
Inventors: 张源斌; 苑岩
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-08-13
Filing date: 2019-08-13
Publication date: 2020-02-20
Also published as: CN110830858B; CN110830858A

Abstract

Embodiments of the present invention provide a client service data transmission method and apparatus, and an optical transport network device and a storage medium. The method comprises: mapping accessed client service data to an optical channel data unit by performing mapping processing on said data; determining a time slot particle size used by a payload area of an optical transport network interface frame in which the optical channel data unit is carried, wherein the optical transport network interface frame is constructed on the basis of a PCS encoding block having a fixed format, and the payload area may support a plurality of different time slot particle sizes; determining the number of time slots needing to be divided by the payload area according to the time slot particle size and the bandwidth of the payload area; and mapping the optical channel data unit into the payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame.

Description

Customer service data transmission method and device, optical transmission network equipment and storage medium

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on August 13, 2018, with application number 201810915664.9, the entire contents of which are incorporated herein by reference.

Technical field

The present invention relates to the field of communications, and in particular, to a method and device for transmitting customer service data, an optical transmission network device, and a storage medium.

Background technique

Optical Transport Network (OTN) standards are developed by the International Telecommunication Union (Union-Telecommunication and Standardization Sector) of the International Telecommunication Union (ITU-T). They are important standards for optical transmission equipment. Now almost all long-distance transmission networks are based on optical Transmission network standard equipment.

In order to realize the transmission of customer service data, the current OTN standard defines multiple types of OTN interfaces, including an optical channel transmission unit (OTUk, Optical Channel Transport Unit-k, k = 1, which uses a byte-based 4 * 4080 structure). 2,3,4), adopting the flexible interconnection interface FlexO, which is based on a 128 * 5140 bit-based structure, but these interfaces have a fixed format frame structure, which limits the choice of forward error correction (FEC, Forward Error Correction), Only one or several fixed FEC types can be selected, which is not convenient for future expansion. At the same time, the frame structure of the fixed format also limits the division of time slots. In some cases, the optical channel data unit (ODU, Optical (Channel, Data, Unit) payload area is divided into integer timeslots, and part of the payload area needs to be filled, which results in wasted payload bandwidth and increases the exit rate.

With the rapid development of data services, the types of customer services tend to diversify, interface rate levels and transmission distance requirements will also diversify, which means that different FEC types will be selected, and the internal time slot division method also needs to be more flexible. In order to adapt to the bearing requirements of different speed services.

Summary of the Invention

The customer service data transmission method, device, optical transmission network equipment and storage medium provided in the embodiments of the present invention are aimed at solving the problem that the structure of the OTN interface frame used in the transmission of different types of customer service data in the related technology is a fixed-format frame structure. , Resulting in limited FEC type selection and internal time slot division.

In order to solve the above technical problems, an embodiment of the present invention provides a method for transmitting customer service data, including: performing mapping processing on the accessed customer service data to map to an optical channel data unit; and determining an optical transmission network carrying the optical channel data unit The time slot granularity used in the payload area of the interface frame; the optical transmission network interface frame is constructed based on a fixed format PCS code block, and the payload area can support multiple different time slot granularity; according to the time slot granularity and the payload area The bandwidth determines the number of timeslots to be divided in the payload area; the optical channel data unit is mapped into the payload area of the optical transport network interface frame, and the optical transport network interface frame is transmitted out.

An embodiment of the present invention further provides a client service data transmission device, including: a first mapping module, configured to map the accessed client service data to an optical channel data unit; and a time slot granularity determination module, The time slot granularity used to determine the payload area of the optical transport network interface frame carrying the optical channel data unit; the optical transport network interface frame is constructed based on a fixed format PCS code block, and the payload area can support multiple different time slot particles Degree; the number of timeslots determining module is used to determine the number of timeslots to be divided in the payload area according to the time slot granularity and the bandwidth of the payload area; the second mapping module is used to map the optical channel data unit to the optical transmission network In the payload area of the interface frame; the transmission module is used to transmit the interface frame of the optical transmission network.

An embodiment of the present invention further provides an optical transmission network device. The optical transmission network device includes a processor, a memory, and a communication bus. The communication bus is used to implement connection and communication between the processor and the memory. The processor is used to execute the storage in the memory. One or more programs to implement the steps of the customer service data transmission method as described above.

An embodiment of the present invention further provides a computer-readable storage medium. The computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors, so as to implement any one of the foregoing. Steps of customer business data transfer method.

The beneficial effects of the present invention are as follows: Embodiments of the present invention provide a method, an apparatus, an optical transmission network device, and a storage medium for transmitting customer service data, and map the accessed customer service data to the optical channel data unit through mapping processing; determine Time slot granularity used in the payload area of the optical transport network interface frame carrying the optical channel data unit; the optical transport network interface frame is constructed based on a fixed format PCS code block, and the payload area can support multiple different time slot granularities; Determine the number of time slots to be divided in the payload area according to the time slot granularity and the bandwidth of the payload area; map the optical channel data units to the payload area of the optical transport network interface frame, and transmit the optical transport network interface frame . Therefore, the OTN interface frame is more flexible in the division of internal time slots when carrying different types of customer service data, realizes decoupling from FEC, improves the utilization efficiency of transmission channels, and enhances the adaptability to different customer service data.

Other features and corresponding beneficial effects of the present invention are explained in the later part of the description, and it should be understood that at least part of the beneficial effects become apparent from the description in the present specification.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flowchart of a method for transmitting customer service data according to a first embodiment of the present invention; FIG.

2 is a schematic structural diagram of an OTN interface frame provided in Embodiment 1 of the present invention;

3 is a schematic diagram of an MSI structure provided in Embodiment 1 of the present invention;

4 is a schematic diagram of a composition of an MSI region provided in Embodiment 1 of the present invention;

5 is a schematic diagram of a mobile bearer scenario provided in Embodiment 2 of the present invention;

6 is a flowchart of a method for constructing an OTN interface frame provided in Embodiment 2 of the present invention;

7 is a schematic diagram of 25GE customer service data transmission by using an OTN interface frame provided in Embodiment 2 of the present invention;

FIG. 8 is a schematic diagram of transmitting GE customer service data by using an OTN interface frame provided in Embodiment 2 of the present invention; FIG.

9 is a schematic diagram of 10GE customer service data transmission by using an OTN interface frame provided in Embodiment 2 of the present invention;

10 is a schematic structural diagram of a client service data transmission device provided in Embodiment 3 of the present invention;

FIG. 11 is a schematic structural diagram of an optical transmission network device provided in Embodiment 4 of the present invention.

detailed description

Optical transmission networks have their standard signal formats, including optical channel transmission units (OTUk, Optical Channel Transport Unit-k, k = 1, 2, 3, 4), flexible interconnection interface FlexO, and new optical transmission network signals defined in the future . Optical transmission network signals are used to carry various non-OTN signals or multiple low-speed optical channel data unit (ODUi, Optical Channel Data Unit-i, i = 0, 1, 2, 2e, 3, 4, flex) signals, and ODUi The rate is lower than the optical channel data unit (ODUk, Optical Channel Data Unit-k) rate. In the future, low-speed ODUi (i <k) signals are used to represent ODUi signals that are lower than the ODUk rate; non-OTN signals refer to signals other than signals that pass through the optical transmission network Various other signals, such as Synchronous Digital Hierarchy (SDH), Ethernet (Ethernet), Fibre Channel (Fibre Channel), various Packet signals, etc.

The signal of the optical transmission network includes two parts of overhead and payload. The following uses OTUk as an example to further explain the components of the signal of the optical transmission network. The OTUk signal consists of OTUk. The remaining part after removing the OTUk overhead in OTUk is called the optical channel data unit ODUk. The remaining part after removing the ODUk overhead in ODUk is called the optical channel payload unit OPUk (Optical Channel Payload Unit-k). The remaining part of the OPUk after removing the OPUk overhead is called the OPUk payload. The OPUk payload can be used to carry a non-OTN signal or multiple low-speed ODUi (i <k) signals. A signal composed of ODUk is called an ODUk signal.

At present, the OTN interface defined in the OTN standard uses a fixed-format frame structure, so in some cases, the ODU payload area cannot be divided into integer timeslots. It is necessary to divide the ODU payload area into the non-customer service. The data-filled area is filled with invalid bytes to meet the customer service transmission requirements of the fixed rate class in the OTN standard, which results in wasted payload bandwidth and increased exit rate. For example, when the payload area corresponding to the OTU4 interface is divided into 80 Gap, the last 8 columns need to be filled. In addition, the fixed format frame structure can only select one or several fixed FECs, which is not convenient for future expansion.

According to the current situation and estimates for the future, more and more interfaces will use the Ethernet format, which means that the main customer services of OTN equipment in the future will be Ethernet services, and these Ethernet may be at any rate Yes, the transmission distance requirements will also be diversified, which means that different FEC types will be selected. Therefore, a new OTN interface frame is needed, which has the capability of decoupling from FEC, and the internal time slot division method needs to be more flexible to meet the bearing requirements of different rate services.

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the embodiments of the present invention in detail through specific implementations and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

Embodiment one:

In order to solve the problem that the structure of the OTN interface frame used when transmitting different types of customer service data is a fixed format frame structure, the FEC type selection and the internal time slot division are limited, this embodiment provides a customer service For a data transmission method, refer to a flowchart of a method for transmitting customer service data shown in FIG. 1.

S101: Map the accessed customer service data to an optical channel data unit.

In order to realize the transmission of customer service data, the customer service data is first mapped to the optical channel payload unit OPUk, and the overhead of the OPUk constitutes the OPUk. Then, the OPUk and the channel overhead of the optical channel data unit ODUk constitute the ODUk.

S102: Determine the granularity of the time slot used in the payload area of the optical transport network interface frame carrying the optical channel data unit; the optical transport network interface frame is constructed based on a fixed format PCS code block, and the payload area can support multiple different time slots Graininess.

It should be noted that the OTN interface frame in this embodiment is constructed using a data format based on PCS (Physical Coding Sublayer) coding blocks (for example, 66b blocks), and a single PCS coding block is used between each time slot The interleaving method is shown in Figure 2. This is a schematic diagram of the structure of the OTN interface frame provided in this embodiment. The overhead of inserting (KJ) PCS code blocks every J PCS code blocks is used to carry the corresponding path monitoring information. , Group management overhead, etc., J PCS coding blocks constitute the payload area of the OTN interface frame, and the payload area supports the flexible setting of different timeslot granularity.

In some examples of this embodiment, the PCS coding block may include but is not limited to at least one of 8b / 10b and 64b / 66b, and may be flexibly selected according to an actual application scenario.

In some examples of this embodiment, according to the bandwidth of the optical channel data unit, the time slot granularity used in the payload area of the optical transport network interface frame carrying the optical channel data unit is determined.

Different types of accessed customer service data have different ODUk bandwidths. In this embodiment, according to the ODUk bandwidth, the OTN interface frame is adapted to carry the time slot granularity that the ODUk should use.

S103: Determine the number of time slots to be divided in the payload area according to the time slot granularity and the bandwidth of the payload area.

For the OTN interface frame in this embodiment, the bandwidth of the payload area is a fixed value, and the payload area can be divided into a corresponding number of time slots according to the determined time slot granularity.

In some examples of this embodiment, the size of the payload area is C times the least common multiple of the number of timeslots corresponding to the number of different timeslots that can be supported, and there is no multiple relationship between the number of different timeslots. , C is an integer greater than or equal to 1.

In this embodiment, in order to adapt to the bearing requirements of different types of services, it is supported to dynamically set the time slot granularity, so the different time slot granularity or the number of time slots corresponding to the different time slot granularity is not an integer multiple relationship, and The size of the payload area can be evenly divided by the number of all supported time slots without any padding.

It should also be noted that the size of the payload area may not be an integer multiple of the number of timeslots corresponding to the current time slot granularity. At this time, the payload area needs to be filled. The size of the payload area after padding is An integer multiple of the number of time slots. In the case where the number of time slots divided in the payload area is different, the size filled in the payload area may also be different.

In order to make the bearer service more efficient, the minimum time slot granularity of the payload area of the optical transport network interface frame carrying the optical channel data unit is determined, that is, the time slot granularity used when the OTN interface frame carries ODUk is determined as the most Small time slot granularity, correspondingly, according to the minimum time slot granularity and the bandwidth of the payload area, determine the maximum number of timeslots N1 that need to be divided in the payload area; for example, when carrying one of the customer service data, calculate its required The minimum time slot granularity is TS _G1 , and the number of time slots N1 corresponding to TS _{G1 is} used as the maximum number of time slots supported by the OTN interface frame in this embodiment. If other types of customer service data bearers need to be supported, On the basis of TS _G1 , the time slot granularity TS _Gx required by other customer service data needs to be increased to meet the needs of carrying other customer service data. When the time slot granularity is TS _Gx , the corresponding number of time slots Nx, among which , TS _{Gx is} greater than TS _G1 , and Nx is less than N1. Then, calculate the least common multiple C of the number of timeslots N1, N2, ..., Np when carrying different customer service data that meet the conditions, then, The payload area size of the OTN interface frame in this embodiment may be expressed as q * C, where q is an integer greater than or equal to 1. In addition, it should also be noted that in order to reduce the complexity of hardware implementation in practical applications, an example in this embodiment may limit the number of different timeslot granularities supported by the OTN interface frame to p, p An integer greater than or equal to 1.

In addition, in practical applications, the maximum value N1 of the number of different timeslots supported in the payload area is determined as the multiple structure identifier of multiple payload branches in the payload area. identifier, MSI). The multiplex structure indication method is used to indicate multiple payload branches in the payload area of the OTN interface frame. Here, the number of MSI frames is the maximum number of timeslots N1 supported by the OTN interface frame, for example, divided by the bearer customer service data G1. The number of timeslots N1 is 25, the number of timeslots N2 divided by the bearer customer service data G2 is 20, and the number of timeslots N3 divided by the bearer customer service data G3 is 19, then the number of MSI frames is set to 25 frames. To be compatible with the indication requirements in different situations.

It should also be noted that when the number of time slots Nx corresponding to the time slot granularity of the optical channel data unit mapped to the accessed customer service data is less than N1, its multiplex structure indicates the remaining N1-Nx frame data of the MSI Make a fill reservation. Continue to accept the above example. For details, please refer to the schematic diagram of the MSI structure shown in FIG. 3, where 20 timeslots are divided when carrying customer service data G2, and the number of MSI frames is based on the maximum division The number of slots N1 is set to 25 frames. As shown in the MSI in the second column in Figure 3, only the first 20 frames need to be indicated, and the remaining 5 frames are filled and set to reserved. Similarly, in the bearer When the customer service data G3, it is only indicated in the first 19 frames, and the remaining 6 frames are filled and set as reserved, as shown in the MSI in the third column in Figure 3. All 25 frames are indicated as shown in the MSI in the first column in Figure 3.

It should be understood that, in practical applications, the time slot granularity is a single time slot granularity or a mixed time slot granularity including multiple time slot granularities.

For the case of single time slot granularity, the MSI is consistent with the MSI of the traditional OTN interface frame; for the case of mixed time slot granularity, as shown in Figure 4, the MSI is divided into three parts, and the first part is the time slot granularity. The degree indication area is used to indicate the time slot bandwidth corresponding to the time slot. The second part is the time slot occupancy indication area to indicate the occupancy of the time slot. The third part is the time slot port number indication area to be used. Indicates the slot port number.

S104: Map the optical channel data unit to the payload area of the optical transport network interface frame, and transmit the optical transport network interface frame.

In this embodiment, the transmission of customer service data is established by establishing a transmission channel that is compatible with the bandwidth of the customer service data, which improves the utilization rate of the payload bandwidth of the OTN interface frame. According to actual needs, the OTN in this embodiment can be changed. The M PCS encoding blocks of the interface frame are combined to perform FEC encoding, and have the capability of decoupling from FEC, which better ensures the backward compatibility of the transmission rate of different types of customer service data.

In addition, in practical applications, this embodiment may also include: encoding and converting the payload area and overhead of the optical transmission network interface frame according to the FEC type; performing FEC encoding on the encoded data stream; and inserting channel alignment Flags and / or codeword flags to the FEC-encoded data stream.

Because the method for transmitting customer service data provided by the embodiment of the present invention maps the accessed customer service data to the optical channel data unit by mapping processing; determining the payload area of the optical transmission network interface frame that carries the optical channel data unit The slot granularity used; the optical transport network interface frame is constructed based on a fixed format PCS code block, and the payload area can support multiple different slot granularity; the payload area is determined based on the slot granularity and the bandwidth of the payload area The number of time slots to be divided; the optical channel data unit is mapped into the payload area of the optical transmission network interface frame, and the optical transmission network interface frame is transmitted out. Therefore, the OTN interface frame is more flexible in the division of internal time slots when carrying different types of customer service data, realizes decoupling from FEC, improves the utilization efficiency of transmission channels, and enhances the adaptability to different customer service data.

Embodiment two:

In order to enable those skilled in the art to better understand the advantages and details of the method for transmitting customer service data in the embodiment of the present invention, FIG. 5 is a schematic diagram of a mobile bearer scenario provided in this embodiment. This embodiment is described in the first embodiment. Based on this, we will continue to introduce the customer's business data transmission method.

In this embodiment, there are many types of customer services, such as GE, 10GE, 25GE and other Ethernet-grade services, common public radio interface services (CPRI, Common Public Radio Interface, and synchronous transmission module 64-level services (STM-64 Synchronous Transport Module level 64), etc., and in order to achieve the transmission of different types of customer services, there are many ways to map customer services to ODUs, such as ODUflex (IMP), ODUflex (GFP), etc. A flowchart of a method for constructing an OTN interface frame according to an embodiment. The method for constructing an OTN interface frame includes:

S601: Determine the type of customer service data that the OTN interface frame needs to support.

In this embodiment, the main customer service data considers ODU0, ODU1, ODU2e, and a new ODU_PCS based on the PCS coding block.

S602: Determine the corresponding time slot granularity used in the payload area of the OTN interface frame carrying the optical channel data unit to which various types of customer service data are mapped according to the type of customer service data; the optical transmission network interface frame is based on a fixed format PCS code Block building.

Among them, the payload area can support multiple different timeslot granularity. For ODU0 and ODU1, using the 1.25G timeslot granularity has the highest mapping efficiency. For the new ODU_PCS based on the PCS code block, if the Ethernet service is in If you adjust the speed before mapping, the granularity of 1G time slot is the most efficient. If you do not adjust the speed, 1.04G granularity is more efficient. For ODU2e, the 1.31G time slot granularity is used to achieve the highest mapping efficiency. In addition, the PCS coding block may include, but is not limited to, at least one of 8b / 10b and 64b / 66b, and may be flexibly selected according to an actual application scenario.

S603: Determine the number of timeslots to be divided in the payload area according to the determined granularity of each timeslot and the bandwidth of the payload area.

In this embodiment, the OTN interface frame payload area uses a 25GE rate. Based on this, when transmitting ODU0 and ODU1, the OTN interface frame payload area can be divided into 20 slots by the 1.25G slot granularity. When transmitting ODU_PCS, with and without speed adjustment before mapping, OTN interface frames can be divided into 25 and 24 time slots by the 1G and 1.04G time slot granularity respectively; while ODU2e is transmitted, OTN interface frames It can be divided into 19 time slots by the time slot granularity of 1.31G.

S604: Calculate the least common multiple based on the number of all timeslots, and construct the OTN interface frame payload area by using the number of PCS coding blocks that are integer multiples of the least common multiple.

In the foregoing embodiment, the OTN interface frame can support four timeslot granularities of 1G, 1.04G, 1.25G, and 1.31G, and the corresponding timeslot numbers are 25, 24, 20, and 19 respectively. According to these four timeslots, The calculated least common multiple of the number is 11,400, so the OTN interface frame in this embodiment uses 11,400 PCS coding blocks to construct the payload area. It should be understood that the integer multiple here should be an integer multiple of 1 or greater.

S605: Insert overhead into the OTN interface frame payload area to form an OTN interface frame.

In an example of this embodiment, an overhead of 8 PCS code blocks may be inserted every 11400 PCS code blocks to construct an OTN interface frame. In addition, in this embodiment, the frame overhead of the OTN interface and the channel alignment flag can be combined and designed. The overhead of the first four PCS coding blocks is used as the channel alignment flag block, and the last four PCS coding blocks are used for the management and maintenance of the OTN interface frame.

In addition, it should be noted that in some examples in this embodiment, the MSI of the OTN interface frame can be set to 12 bits, which is mainly used in the case of mixed time slots, that is, the first part of the MSI is allocated 3 bits, and the second part is allocated 2 Bits, the third part is allocated 7 bits, sent once per frame, and the 25 frames are sent. It can also be set to 9 bits, which is mainly used in the case of a single time slot.

In addition, the new OTN interface frame also supports the case where the time slot granularity is 25G and the number of time slots is 1, which is not described herein again.

Based on the OTN interface frame constructed in the foregoing embodiment, the following uses specific examples to describe the implementation of customer service data transmission through the OTN interface frame in several different application scenarios.

Method 1: The 25GE customer service data is transmitted based on the OTN interface frame constructed above. As shown in FIG. 7, the OTN interface frame provided by this embodiment is used to transmit 25GE customer service data.

Step 1: Perform de-FEC and descrambling processing on the 25GE customer service data to recover the PCS code block data stream, adjust the speed of the PCS code block data stream, and insert the overhead to form an ODU_PCS based on the PCS code block.

Step 2: According to the ODU_PCS rate class, determine the granularity of the time slot used when the payload area of the OTN interface frame carries ODU_PCS is 25G, and determine the number of timeslots to be divided in the payload area as 1.

Among them, the number of MSI frames is 25 frames. The MSI is transmitted only in the first frame, and the remaining 24 frames are used for padding.

Step 3: Map the ODU_PCS to a time slot divided by the OTN interface frame payload area, and fill the area of the OTN interface frame payload area beyond the ODU_PCS with byte padding.

When the size of the payload area of the OTN interface frame in this embodiment is slightly larger than ODU_PCS, certain PCS blocks in the payload area are filled with special bytes for rate adaptation.

Step 4: The OTN interface frame carrying the ODU_PCS is transmitted.

Method 2: The GE customer service data is transmitted based on the OTN interface frame constructed above. As shown in FIG. 8, a schematic diagram of the OTN interface frame provided by this embodiment for transmitting GE customer service data is shown.

Step 1: Map GE customer service data to ODU0.

Step 2: Determine the granularity of the timeslot used when the payload area of the OTN interface frame carries ODU0 according to the rate class of ODU0 is 12.5G, and determine the number of timeslots to be divided in the payload area as 20.

Among them, the time slot and time slot are interleaved based on the PCS coding block. The number of MSI frames is 25 frames. The MSI is only transmitted in the first 20 frames, and the remaining 5 frames are used for padding.

Step 3: Map ODU0 to the 20 time slots divided by the OTN interface frame payload area, and fill the area of the OTN interface frame payload area beyond ODU0 with byte padding.

Among them, one ODU0 is directly mapped to one time slot in the frame payload area of the OTN interface. In addition, when the size of the payload area of the OTN interface frame in this embodiment is slightly larger than ODU0, some PCS blocks in the payload area are filled with special bytes for rate adaptation.

Step 4: The OTN interface frame carrying ODU0 is transmitted.

Method 3: The 10GE customer service data is transmitted based on the OTN interface frame constructed above. As shown in FIG. 9, the OTN interface frame provided by this embodiment is used to transmit 10GE customer service data.

Step 1: Map 10GE customer service data to ODU2e.

Step 2: Determine the granularity of the timeslot used when the payload area of the OTN interface frame carries ODU2e according to the rate class of the ODU2e is 1.31G, and determine the number of timeslots to be divided in the payload area as 19.

Among them, the time slot and time slot are interleaved based on the PCS coding block. The number of MSI frames is 25 frames. The MSI is only transmitted in the first 19 frames, and the remaining 6 frames are used for padding.

Step 3: Map the ODU2e to the 19 time slots divided by the OTN interface frame payload area, and fill the area of the OTN interface frame payload area beyond the ODU2e with byte padding.

Among them, one ODU2e is directly mapped into 8 time slots in the frame payload area of the OTN interface. In addition, when the payload area of the OTN interface frame in this embodiment is slightly larger than the ODU2e, certain PCS blocks in the payload area are filled with special bytes for rate adaptation.

Step 4: The OTN interface frame carrying the ODU2e is transmitted.

Method 4: Based on the OTN interface frame constructed above, 10 GE customer service data and 1 12.5 GE customer service data are transmitted.

Step 1: Map GE customer service data to ODU0, and restore 25GE customer service data into a PCS coded block data stream and insert the overhead to form ODU_PCS.

Step 2: Determine the time slot granularity supported by ODU0 and ODU_PCS when the payload area of the OTN interface frame carries ODU0 and ODU_PCS according to the rate class of ODU0 and ODU_PCS, and determine the number of timeslots to be divided in the payload area twenty two.

Among them, the time slot and time slot are interleaved based on the PCS coding block. The number of MSI frames is 25 frames. The MSI is only transmitted in the first 22 frames, and the remaining 3 frames are used for padding. Fill in the slot granularity indicator of 1.25G or 1.04G in the first part of the MSI, fill in the slot occupancy in the second part, and fill in the corresponding port number in the third part. OTN interface frames can be continuous or discontinuous.

Step 3: Map ODU0 and ODU_PCS to the 19 time slots divided by the OTN interface frame payload area, and fill the area of the OTN interface frame payload area beyond ODU0 or ODU_PCS with byte padding.

Among them, 10 ODU0 are directly mapped into the 10 time slots of the OTN interface frame payload area, each ODU0 corresponds to one time slot, and 1 ODU_PCS is directly mapped into the 12 time slots of the OTN interface frame payload area. In addition, when the size of the payload area of the OTN interface frame in this embodiment is slightly larger than ODU0 or ODU_PCS, certain PCS blocks in the payload area are filled with special bytes for rate adaptation.

Step 4: The OTN interface frame carrying ODU0 and ODU_PCS is transmitted.

The method for transmitting customer service data provided in the embodiment of the present invention maps the accessed customer service data to the optical channel data unit by mapping processing; determining the payload area used by the optical transmission network interface frame carrying the optical channel data unit Time slot granularity; optical transport network interface frames are constructed based on fixed-format PCS code blocks, and the payload area can support multiple different time slot granularities; the required division of the payload area is determined based on the time slot granularity and the bandwidth of the payload area The number of time slots of the optical channel; the optical channel data unit is mapped into the payload area of the optical transmission network interface frame, and the optical transmission network interface frame is transmitted out. Therefore, the OTN interface frame is more flexible in the division of internal time slots when carrying different types of customer service data, realizes decoupling from FEC, improves the utilization efficiency of transmission channels, and enhances the adaptability to different customer service data.

Embodiment three:

Please refer to FIG. 10. FIG. 10 is a schematic structural diagram of a client service data transmission apparatus according to this embodiment, including:

The first mapping module 1001 is configured to perform mapping processing on the accessed customer service data to map to the optical channel data unit.

In order to realize the transmission of customer service data, the customer service data is first mapped to the optical channel payload unit OPUk through the first mapping module 1001, and the OPUk overhead is added to form OPUk. Then, the OPUk frame is added to the optical channel data unit ODUk. The channel overhead constitutes ODUk.

The time slot granularity determination module 1002 is used to determine the time slot granularity used in the payload area of the optical transport network interface frame carrying the optical channel data unit; the optical transport network interface frame is constructed based on a fixed format PCS code block, and the payload is Zones can support multiple different time slot granularities.

It should be noted that the OTN interface frame in this embodiment is constructed using a data format based on PCS (Physical Coding Sublayer) coding blocks (for example, 66b blocks), and a single PCS coding block is used between each time slot For example, the overhead of inserting (KJ) PCS-based coding blocks every J PCS coding blocks is used to carry the corresponding path monitoring information, group management overhead, etc. The J PCS coding blocks form the net of the OTN interface frame. The payload area and payload area support the flexible setting of the granularity of different time slots. The PCS coding block may include, but is not limited to, at least one of 8b / 10b and 64b / 66b, and may be flexibly selected according to an actual application scenario.

In some examples of this embodiment, the time slot granularity determination module 1002 determines the time slot granularity used in the payload area of the optical transport network interface frame carrying the optical channel data unit according to the bandwidth of the optical channel data unit.

Different types of accessed customer service data have different ODUk rate levels. In this embodiment, the ODU interface frame is used to adapt the OTN interface frame to carry the time slot granularity used by the ODUk.

The timeslot number determining module 1003 is configured to determine the number of timeslots to be divided in the payload area according to the granularity of the timeslot and the bandwidth of the payload area.

For the OTN interface frame in this embodiment, the bandwidth of the payload area is a fixed value, and the timeslot number determination module 1003 can determine the number of timeslots in which the payload area needs to be divided according to the slot granularity.

In an example of this embodiment, in order to make the bearer service more efficient, the timeslot granularity determining module 1002 is configured to determine a minimum timeslot granularity of a payload area of an optical transport network interface frame carrying an optical channel data unit. That is, the time slot granularity used when the OTN interface frame carries ODUk is determined as the minimum time slot granularity. Correspondingly, the time slot number determination module 1003 determines the payload area based on the minimum time slot granularity and the bandwidth of the payload area. The maximum number of time slots to be divided N1; for example, when carrying one of the customer service data, the minimum time slot granularity required to calculate it is TS _G1 , and the number of time slots N1 corresponding to TS _{G1 is} used as the OTN in this embodiment The maximum number of timeslots supported by the interface frame. If other types of customer service data bearers need to be supported, on the basis of TS _G1 , the time slot granularity TS _Gx required by other customer service data needs to be increased to satisfy the bearers. other demand customer service data, which corresponds to the number of slots in timeslot Nx particle size of TS _Gx, wherein, TS _Gx greater than TS _G1, Nx is less than N1, then calculated the carrier does not meet the conditions Number of timeslots N1, N2, ..., Np divided by customer service data, respectively, then the payload area size of the OTN interface frame in this embodiment can be expressed as q * C, where q is taken as An integer greater than or equal to 1. In addition, it should also be noted that in order to reduce the complexity of hardware implementation in practical applications, an example in this embodiment may limit the number of different timeslot granularities supported by the OTN interface frame to p, p An integer greater than or equal to 1.

In addition, in an actual application, as an example in this embodiment, an MSI frame number determination module is further included, which is configured to determine a maximum value N1 among a plurality of different timeslot numbers supported by the payload area as a net value. The multiplexing structure of multiple payload branches in the payload area indicates the number of MSI frames. The multiplexing structure indication method is used to indicate multiple payload branches in the payload area of the OTN interface frame. Here, the number of MSI frames is the maximum number of all time slots N1 supported by the OTN interface frame.

It should also be noted that, in some examples in this embodiment, it also includes an MSI setting module, which is used to count the number of timeslots Nx corresponding to the timeslot granularity of the optical channel data unit mapped to the accessed customer service data When it is less than N1, the remaining N1-Nx frame data whose multiplexing structure indicates MSI is filled and reserved.

For the single time slot granularity, the MSI is consistent with the MSI of the traditional OTN interface frame; for the mixed time slot granularity, the MSI can be divided into three parts. The first part is the time slot granularity indication area. To indicate the time slot bandwidth corresponding to the time slot. The second part is the time slot occupancy indication area to indicate the occupancy of the time slot. The third part is the time slot port number indication area to indicate the time slot port number. .

The second mapping module 1004 is configured to map an optical channel data unit to a payload area of an optical transmission network interface frame.

A transmission module 1005 is configured to transmit an optical transmission network interface frame.

In this embodiment, the transmission of customer service data is established by establishing a transmission channel that is compatible with the bandwidth of the customer service data, which improves the utilization rate of the payload bandwidth of the OTN interface frame. According to actual needs, the OTN in this embodiment may be The M PCS encoding blocks of the interface frame are combined to perform FEC encoding, and have the capability of decoupling from FEC, which better ensures the backward compatibility of the transmission rate of different types of customer service data.

In addition, in practical applications, this embodiment may further include: a flag insertion module, configured to encode and convert the payload area and the overhead of the optical transmission network interface frame according to the FEC type; and encode the converted data. The stream is FEC encoded; the channel alignment flag and / or codeword flag is inserted into the FEC-encoded data stream.

The client service data transmission device provided by the embodiment of the present invention maps the accessed client service data to the optical channel data unit by mapping processing; and determines the payload area used by the optical transmission network interface frame carrying the optical channel data unit. Time slot granularity; optical transport network interface frames are constructed based on fixed-format PCS code blocks, and the payload area can support multiple different time slot granularities; the required division of the payload area is determined based on the time slot granularity and the bandwidth of the payload area The number of time slots of the optical channel; the optical channel data unit is mapped into the payload area of the optical transmission network interface frame, and the optical transmission network interface frame is transmitted out. Therefore, the OTN interface frame is more flexible in the division of internal time slots when carrying different types of customer service data, realizes decoupling from FEC, improves the utilization efficiency of transmission channels, and enhances the adaptability to different customer service data.

Embodiment 4:

Please refer to FIG. 11. FIG. 11 is a schematic structural diagram of an optical transmission network device according to this embodiment, including a processor 1101, a memory 1102, and a communication bus 1103.

The communication bus 1103 is used to implement connection and communication between the processor 1101 and the memory 1102.

The processor 1101 is configured to execute one or more computer programs stored in the memory 1102 to implement the flow of the method for transmitting customer service data in the foregoing embodiments of the present invention, and details are not described herein again.

Fifth Embodiment

This embodiment provides a computer-readable storage medium. The computer-readable storage medium stores one or more computer programs, and the computer programs can be executed by one or more processors to implement the clients in the foregoing embodiments. The service data transmission method is not repeated here.

Obviously, those skilled in the art should understand that the modules or steps of the embodiments of the present invention described above can be implemented by a general-purpose computing device, and they can be centralized on a single computing device or distributed by multiple computing devices. On the network, optionally, they can be implemented with program code executable by a computing device, so that they can be stored in a computer storage medium (ROM / RAM, magnetic disk, optical disk) and executed by the computing device, and in a certain In some cases, the steps shown or described can be performed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps in them can be made into a single integrated circuit module. . Therefore, the present invention is not limited to any specific combination of hardware and software.

The above content is a further detailed description of the embodiments of the present invention in combination with specific implementation manners, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without deviating from the concept of the present invention, several simple deductions or replacements can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

A method for transmitting customer service data, including:

Map the accessed customer service data to the optical channel data unit;

Determining the time slot granularity used in the payload area of the optical transport network interface frame carrying the optical channel data unit; the optical transport network interface frame is constructed based on a fixed format physical coding sublayer PCS coding block, and the payload Zone can support multiple different time slot granularity;

Determining the number of time slots to be divided in the payload area according to the time slot granularity and the bandwidth of the payload area;

Map the optical channel data unit to the payload area of the optical transmission network interface frame, and transmit the optical transmission network interface frame.
The method for transmitting customer service data according to claim 1, wherein the time slot granularity used for determining a payload area of an optical transport network interface frame carrying the optical channel data unit comprises:

According to the bandwidth of the optical channel data unit, a time slot granularity used in a payload area of an optical transmission network interface frame carrying the optical channel data unit is determined.
The method for transmitting customer service data according to claim 1, wherein the size of the payload area is C times the least common multiple of the number of timeslots corresponding to the granularity of the plurality of different timeslots that can be supported, and There is no multiple relationship between the granularity of multiple different time slots, and C is an integer greater than or equal to 1.
The method for transmitting customer service data according to claim 1, further comprising: encoding and converting a payload area and an overhead portion of the optical transmission network interface frame according to a forward error correction FEC type; and encoding and converting the data stream FEC encoding is performed; at least one of a channel alignment flag and a codeword flag is inserted into the FEC-encoded data stream.
The method for transmitting customer service data according to any one of claims 1 to 4, wherein the PCS coding block includes at least one of 8b / 10b and 64b / 66b.
A customer service data transmission device includes:

A first mapping module configured to map the accessed customer service data to an optical channel data unit;

The time slot granularity determining module is configured to determine a time slot granularity used in a payload area of an optical transmission network interface frame carrying the optical channel data unit; the optical transmission network interface frame is based on a fixed format physical coding sublayer PCS code block construction, the payload area can support multiple different time slot granularity;

A timeslot number determining module, configured to determine the number of timeslots that need to be divided in the payload area according to the timeslot granularity and the bandwidth of the payload area;

A second mapping module configured to map the optical channel data unit to the payload area of the optical transmission network interface frame;

A transmission module configured to transmit the optical transmission network interface frame.
The client service data transmission device according to claim 6, wherein the size of the payload area is C times the least common multiple of the number of timeslots corresponding to the plurality of different timeslot granularities that can be supported, and There is no multiple relationship between the granularity of multiple different time slots, and C is an integer greater than or equal to 1.
The client service data transmission device according to claim 6 or 7, wherein the PCS coding block includes at least one of 8b / 10b and 64b / 66b.
An optical transmission network device, which includes a processor, a memory, and a communication bus;

The communication bus is configured to implement connection and communication between the processor and the memory;

The processor is configured to execute at least one program stored in a memory to implement the method for transmitting customer service data according to any one of claims 1 to 5.
A computer-readable storage medium storing at least one program, the at least one program being executable by at least one processor to implement a client according to any one of claims 1 to 5. Business data transmission method.