CN110830858B - Customer service data transmission method, device, optical transmission network equipment and storage medium - Google Patents

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

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CN110830858B
CN110830858B CN201810915664.9A CN201810915664A CN110830858B CN 110830858 B CN110830858 B CN 110830858B CN 201810915664 A CN201810915664 A CN 201810915664A CN 110830858 B CN110830858 B CN 110830858B
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payload area
interface frame
service data
time slot
transport network
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CN110830858A (en
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张源斌
苑岩
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation

Abstract

The embodiment of the invention provides a method and a device for transmitting client service data, optical transmission network equipment and a storage medium, wherein the method maps the accessed client service data to an optical channel data unit; determining the time slot granularity used by a payload area of an optical transport network interface frame bearing an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities; determining the number of time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area; and mapping the optical channel data unit to a payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame. Therefore, the division of the internal time slot is more flexible when the OTN interface frame bears different types of customer service data, the decoupling with the FEC is realized, the utilization efficiency of a transmission channel is improved, and the adaptability to different customer service data is enhanced.

Description

Customer service data transmission method, device, optical transmission network equipment and storage medium
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting customer service data, an optical transport network device, and a storage medium.
Background
The Optical Transport Network (OTN) standard is established by the International telecommunications Union (ITU-T), and is an important standard for Optical transmission equipment, and almost all long-distance transmission networks are now composed of equipment based on the OTN standard.
In order to realize the transmission of customer service data, the OTN standard currently defines multiple types of OTN interfaces, including an Optical Channel transmission Unit (OTUk, Optical Channel Transport Unit-k, k is 1,2,3,4) adopting a byte-based 4 × 4080 structure, a flexible interconnection interface FlexO adopting a bit-based 128 × 5140 structure, and the like, however, these interfaces are all frame structures with fixed formats, which limit the selection of Forward Error Correction (FEC), and only can select one or several fixed FEC types, which is inconvenient for future expansion; meanwhile, the frame structure with a fixed format also restricts the division of time slots, and in some cases, the payload area of an Optical Channel Data Unit (ODU) cannot be divided into time slots of integral multiple, and a part of the payload area needs to be filled, so that the waste of payload bandwidth is generated, and the exit rate is increased.
With the rapid development of data services, the types of client services tend to be diversified, the requirements of interface rate levels and transmission distances also tend to be diversified, which means that different FEC types can be selected, and the internal time slot division mode also needs to be more flexible to adapt to the bearing requirements of services with different rates.
Disclosure of Invention
The customer service data transmission method, the customer service data transmission device, the optical transport network equipment and the storage medium provided by the embodiment of the invention aim to solve the problem that the FEC type selection and the internal time slot division are limited because the structure of an OTN interface frame adopted when different types of customer service data are transmitted in the related technology is a frame structure with a fixed format.
In order to solve the above technical problem, an embodiment of the present invention provides a method for transmitting customer service data, including:
mapping the accessed customer service data to an optical channel data unit;
determining the time slot granularity used by a payload area of an optical transport network interface frame bearing an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities;
determining the number of time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area;
and mapping the optical channel data unit to a payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame.
The embodiment of the invention also provides a client service data transmission device, which comprises:
the first mapping module is used for mapping the accessed customer service data to an optical channel data unit;
a time slot granularity determining module, configured to determine a time slot granularity used by a payload area of an otn interface frame carrying an otu; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities;
the time slot number determining module is used for determining the number of the time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area;
the second mapping module is used for mapping the optical channel data unit to a payload area of the optical transport network interface frame;
and the transmission module is used for transmitting the optical transmission network interface frame.
The embodiment of the invention also provides optical transport network equipment, which comprises a processor, a memory and a communication bus;
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is adapted to execute one or more programs stored in the memory to implement the steps of the method of customer service data transfer as described in any one of the above.
An embodiment of the present invention further provides a computer-readable storage medium, which stores one or more programs, where the one or more programs are executable by one or more processors to implement the steps of the client service data transmission method as described in any one of the above.
The invention has the beneficial effects that:
the embodiment of the invention provides a method and a device for transmitting client service data, optical transmission network equipment and a storage medium, wherein the method maps the accessed client service data to an optical channel data unit; determining the time slot granularity used by a payload area of an optical transport network interface frame bearing an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities; determining the number of time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area; and mapping the optical channel data unit to a payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame. Therefore, the division of the internal time slot is more flexible when the OTN interface frame bears different types of customer service data, the decoupling with the FEC is realized, the utilization efficiency of a transmission channel is improved, and the adaptability to different customer service data is enhanced.
Additional features and corresponding advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
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 the first embodiment of the present invention;
FIG. 3 is a schematic diagram of an MSI structure provided in the first embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating MSI region composition provided in the first embodiment of the present invention;
fig. 5 is a schematic diagram of a mobile bearer scenario provided in the second embodiment of the present invention;
fig. 6 is a flowchart of a method for constructing an OTN interface frame according to a second embodiment of the present invention;
fig. 7 is a schematic diagram of an OTN interface frame provided in the second embodiment of the present invention for performing 25GE customer service data transmission;
fig. 8 is a schematic diagram of GE client service data transmission performed by an OTN interface frame provided in the second embodiment of the present invention;
fig. 9 is a schematic diagram of 10GE customer service data transmission performed by an OTN interface frame provided in the second embodiment of the present invention;
fig. 10 is a schematic structural diagram of a client service data transmission device according to a third embodiment of the present invention;
fig. 11 is a schematic structural diagram of an optical transport network device according to a fourth embodiment of the present invention.
Detailed Description
The Optical Transport network has its standard signal format, including an Optical Channel Transport Unit (OTUk, Optical Channel Transport Unit-k, k ═ 1,2,3,4), a flexible interconnect interface FlexO, and a new Optical Transport network signal defined in the future. The Optical transport network signal is 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 the ODUi rate is lower than the Optical Channel Data Unit (ODUk, Optical Channel Data Unit-k), and then the low-speed ODUi (i < k) signal is used to represent the ODUi signal with a lower rate than the ODUk rate; the non-OTN signal refers to various other signals besides the optical transport network signal, such as Synchronous Digital Hierarchy (SDH) signal, Ethernet signal (Ethernet), Fibre channel signal (Fibre channel), various Packet signals, and the like.
The optical transport network signal includes two parts of an overhead and a payload, and the following takes OTUk as an example to further describe the constituent parts of the optical transport network signal. The OTUk signal is composed of OTUk, a remaining portion of OTUk after removing OTUk overhead is called an Optical Channel data Unit ODUk, a remaining portion of ODUk after removing ODUk overhead is called an Optical Channel Payload Unit OPUk (Optical Channel Payload Unit-k), a remaining portion of OPUk after removing OPUk overhead is called an OPUk Payload, the OPUk Payload can be used for carrying a non-OTN signal or a plurality of low-speed ODUi (i < k) signals, and a signal composed of ODUk is called an ODUk signal.
At present, all OTN interfaces defined in the OTN standard adopt a frame structure with a fixed format, so that an ODU payload area cannot be divided into integer multiple timeslots under certain circumstances, an area not filled with client service data in the ODU payload area needs to be subjected to invalid byte filling to meet a client service transmission requirement with a fixed rate level in the OTN standard, thereby causing waste of payload bandwidth and causing an increase in egress rate, for example, a payload area corresponding to an OTU4 interface is divided into 80 timeslots, and the last 8 columns need to be filled. And the frame structure with fixed format can only select one or several fixed FEC, which is inconvenient for future expansion.
As is the case today and as will be appreciated in the future, more and more interfaces will be in ethernet format, which means that the main customer traffic of future OTN devices will be ethernet traffic, and that these ethernet traffic may be of any rate, and the transmission distance requirements will be diversified, meaning that different FEC types will be chosen. Therefore, a new OTN interface frame is needed, which has the capability of being decoupled from FEC, and the internal time slot division mode needs to be more flexible to adapt to the bearer requirements of different rate services.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
in order to solve the problem that the structure of the OTN interface frame adopted when different types of client service data are transmitted is a frame structure with a fixed format, so that FEC type selection and internal timeslot division are limited, this embodiment provides a method for transmitting client service data, please refer to the flowchart of the method for transmitting client service data shown in fig. 1:
s101: and mapping the accessed customer service data to an optical channel data unit.
In order to realize the transmission of the client service data, the client service data is first mapped to an optical channel payload unit OPUk, and then the OPUk and the overhead of the OPUk form an OPUk, and then the OPUk and the overhead of the optical channel data unit ODUk form an ODUk.
S102: determining the time slot granularity used by a payload area of an optical transport network interface frame bearing an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities.
It should be noted that, in the embodiment, the OTN interface frame is constructed by using a data format based on PCS (Physical Coding Sublayer) Coding blocks (for example, 66b blocks), and an interleaving manner of a single PCS Coding block is used between time slots, as shown in fig. 2, a schematic structure diagram of the OTN interface frame provided in this embodiment is provided, where (K-J) overheads based on PCS Coding blocks are inserted every J PCS Coding blocks, the overheads are used for carrying corresponding path monitoring information, group management overheads, and the like, the J PCS Coding blocks form a payload area of the OTN interface frame, and the payload area supports flexible setting of different slot granularities.
In some examples of the embodiment, the PCS coding block can comprise at least one of 8b/10b and 64b/66b, and can be flexibly selected according to actual application scenes.
In some examples of this embodiment, the slot granularity used in the payload section of the optical transport network interface frame carrying the optical channel data unit is determined according to the bandwidth of the optical channel data unit.
The types of the accessed client service data are different, and the bandwidths of the ODUk corresponding to the client service data are also different, in this embodiment, the timeslot granularity used by the OTN interface frame to carry the ODUk is adapted according to the bandwidth of the ODUk.
S103: and determining the number of the time slots required to be divided by 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 may be divided into a corresponding number of timeslots according to the determined timeslot granularity.
In some examples of this embodiment, the size of the payload area is C times the least common multiple of the number of slots corresponding to the supportable plurality of different slot granularities, there is no multiple relationship between the plurality of different slot granularities, and C is an integer greater than or equal to 1.
In this embodiment, in order to meet the bearing requirements of different types of services, dynamic setting of the slot granularity is supported, so that the slot granularity or the number of slots corresponding to the slot granularity is not an integral multiple, and the size of the payload area can be divided by the number of all supported 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 timeslot granularity, at this time, the payload area needs to be padded, and the size of the payload area after the padding is removed is an integer multiple of the number of timeslots. In the case that the number of slots into which the payload region is divided is different, the size of padding in the payload region may also be different.
To enable the bearing industryThe method includes the steps that the service efficiency is higher, the minimum time slot granularity of a payload area of an optical transport network interface frame bearing an optical channel data unit is determined, namely the time slot granularity used when an OTN interface frame bears an ODUk is determined to be the minimum time slot granularity, and correspondingly, the maximum time slot number N1 required to be divided by the payload area is determined according to the minimum time slot granularity and the bandwidth of the payload area; for example, when carrying one of the customer service data, the minimum time slot granularity required for calculating the customer service data is TSG1Will TSG1The corresponding timeslot number N1 is the maximum supported timeslot number of the OTN interface frame in this embodiment, and when it is further required to support bearers of other types of customer service data, in the TSG1On the basis of the time slot granularity TS required by other customer service dataGxTo meet the requirement of bearing other customer service data, the time slot granularity is TSGxIts corresponding number of time slots Nx, where TSGxGreater than TSG1Nx is smaller than N1, and then, the number of slots N1, N2, that are divided when carrying different customer service data that satisfy the condition is calculated, and the smallest common multiple C of Np, then, the size of the payload area of the OTN interface frame in this embodiment may be represented as q × C, and q is an integer greater than or equal to 1. In addition, it should be further noted that, in order to reduce the hardware implementation complexity in practical applications, in an example in this embodiment, the number of different slot granularities supported by the OTN interface frame may be limited to p, where p is an integer greater than or equal to 1.
In addition, in practical application, the maximum value N1 of the multiple different time slot numbers supported by the payload area is determined as the frame number of the MSI indicated by the multiplexing structure of the multiple payload branches of the payload area. And indicating a plurality of payload branches of a payload area of an OTN interface frame by adopting a multiplexing structure indication method, wherein the frame number of the MSI is the number N1 of all the maximum time slots supported by the OTN interface frame, for example, the number N1 of the time slot divided by the carrying client service data G1 is 25, the number N2 of the time slot divided by the carrying client service data G2 is 20, and the number N3 of the time slot divided by the carrying client service data G3 is 19, and then setting the frame number of the MSI to be 25 frames to be compatible with the indication requirements under different conditions.
It should be further noted that, when the slot number Nx corresponding to the slot granularity of the optical channel data unit mapped by the accessed customer service data is less than N1, the remaining N1-Nx frame data of the MSI indicated by the multiplexing structure is reserved. Continuing with the above example, please refer to the structural diagram of MSI shown in fig. 3, wherein 20 slots are divided when carrying the client service data G2, and the number of MSI is set to 25 frames according to the maximum number of slots N1 divided when carrying the client service data G1, as shown in the MSI in the second column in fig. 3, only the first 20 frames are needed to be indicated, and the remaining 5 frames are filled to be set as reserved, similarly, when carrying the client service data G3, only the first 19 frames are indicated, and the remaining 6 frames are filled to be set as reserved, as shown in the MSI in the third column in fig. 3, and as shown in the MSI in the first column in fig. 3, all 25 frames are indicated in the carrying client service data G1.
It should be understood that in practical applications, the slot granularity is a single slot granularity or a mixed slot granularity including a plurality of 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 the mixed slot granularity, as shown in fig. 4, the MSI is divided into three parts, where the first part is a slot granularity indication area for indicating the slot bandwidth corresponding to the slot, the second part is a slot occupancy indication area for indicating the occupancy of the slot, and the third part is a slot port number indication area for indicating the slot port number.
S104: and mapping the optical channel data unit to a payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame.
In this embodiment, the transmission of the client service data is performed by establishing a transmission channel adapted to the bandwidth of the client service data, so that the utilization rate of the payload bandwidth of the OTN interface frame is improved, and M PCS coding blocks of the OTN interface frame in this embodiment may be combined according to actual needs to perform FEC coding, which has a decoupling capability with FEC, thereby better ensuring that the transmission rates of different types of client service data are backward compatible.
In addition, in practical application, the present embodiment may further include: carrying out coding conversion on a payload area and an overhead part of an interface frame of an optical transport network according to the FEC type; FEC encoding is carried out on the data stream after code conversion; and inserting a channel alignment mark and/or a code word mark into the FEC coded data stream.
According to the customer service data transmission method provided by the embodiment of the invention, the accessed customer service data is mapped to the optical channel data unit by mapping; determining the time slot granularity used by a payload area of an optical transport network interface frame bearing an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities; determining the number of time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area; and mapping the optical channel data unit to a payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame. Therefore, the division of the internal time slot is more flexible when the OTN interface frame bears different types of client service data, the decoupling with the FEC is realized, the utilization efficiency of a transmission channel is improved, and the adaptability to different types of client service data is enhanced.
Example two:
in order to make those skilled in the art more clearly understand the advantages and details of the method for transmitting client service data in the embodiment of the present invention, as shown in fig. 5, which is a schematic diagram of a mobile bearer scenario provided in this embodiment, the present embodiment continues to describe the method for transmitting client service data on the basis of the first embodiment:
in this embodiment, the types of client services are multiple, for example, GE,10GE, and 25GE constant rate ethernet services, Common Public Radio Interface services (CPRI, Common Public Radio Interface, Synchronous Transport Module 64 level services (STM-64, Synchronous Transport Module level 64), and the like, and in order to implement transmission of different types of client services, mapping manners of the client services to ODUs are also multiple, for example, oduflex (imp), oduflex (gfp), and the like, as shown in fig. 6, the OTN Interface frame construction method provided in this embodiment includes:
s601: and determining the type of the client service data required to be supported by the OTN interface frame.
In this embodiment, the main customer service data considers ODU0, ODU1, ODU2e and a new ODU _ PCS based on PCS coding blocks.
S602: determining the corresponding time slot granularity used by a payload area of an OTN interface frame carrying an optical channel data unit mapped by various types of customer service data according to the type of the customer service data; the optical transport network interface frame is constructed based on a fixed-format PCS coding block.
The payload area can support a plurality of different slot granularities, and for the ODU0 and the ODU1, the slot granularity of 1.25G is used, so that the mapping efficiency is highest; for a new ODU _ PCS based on a PCS coding block, if the speed of an Ethernet service is regulated before mapping, the 1G time slot granularity efficiency is highest, and if the speed is not regulated, the 1.04G granularity efficiency is higher; for the ODU2e, the mapping efficiency is highest using the slot granularity of 1.31G. In addition, the PCS coding block can include but is not limited to at least one of 8b/10b and 64b/66b, and flexible selection can be carried out according to actual application scenes.
S603: and respectively determining the number of the time slots required to be divided by the payload area according to the determined granularity of each time slot and the bandwidth of the payload area.
In this embodiment, the payload area of the OTN interface frame uses a rate of 25GE, and based on this, when the ODU0 and ODU1 are transmitted, the payload area of the OTN interface frame may be divided into 20 timeslots by a timeslot granularity of 1.25G; when ODU _ PCS is transmitted, under the conditions of pacing and non-pacing before mapping, an OTN interface frame may be divided into 25 and 24 timeslots by timeslot granularity of 1G and 1.04G, respectively; while in the transmission of ODU2e, an OTN interface frame may be divided into 19 timeslots by timeslot granularity of 1.31G.
S604: and calculating the least common multiple according to the number of all the time slots, and constructing the payload area of the OTN interface frame through the PCS coding blocks of which the number is integral multiple of the least common multiple.
The OTN interface frame in the foregoing embodiment may support four timeslot granularities of 1G, 1.04G, 1.25G, and 1.31G, the corresponding timeslot numbers are 25, 24, 20, and 19, respectively, and then the least common multiple calculated according to the four timeslot numbers is 11400, and then the OTN interface frame in this embodiment uses 11400 PCS coding blocks to construct the payload area, it should be understood that the integer multiple here shall mean an integer multiple greater than or equal to 1.
S605: and inserting the overhead into the payload area of the OTN interface frame to form the OTN interface frame.
In an example of the present embodiment, the overhead of inserting 8 PCS coding blocks every 11400 PCS coding blocks may be constructed as an OTN interface frame. In addition, in this embodiment, the overhead of the OTN interface frame and the channel alignment flag may be designed in a merged manner, the overhead of the first four PCS coding blocks is used as a channel alignment flag block, and the overhead of the last 4 PCS coding blocks is 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 may be set to 12 bits, and is mainly used in the mixed timeslot case, that is, the first portion of the MSI is allocated with 3 bits, the second portion is allocated with 2 bits, the third portion is allocated with 7 bits, and each frame is transmitted once, and 25 frames are completely transmitted. It can also be set to 9 bits, mainly for single slot case.
In addition, the new OTN interface frame also supports the situation that the timeslot granularity is 25G and the timeslot number is 1, which is not described herein again.
Based on the OTN interface frame constructed in the foregoing manner in this embodiment, an implementation manner of performing client service data transmission through the OTN interface frame in several different application scenarios is described below through several specific examples.
The first method is as follows: based on the OTN interface frame constructed in the foregoing, 25GE client service data is transmitted, as shown in fig. 7, which is a schematic diagram of the OTN interface frame provided in this embodiment for transmitting 25GE client service data.
Step 1: carrying out FEC removal and descrambling treatment on 25GE client service data to recover PCS coding block data flow, and inserting overhead after regulating the speed of the PCS coding block data flow to form an ODU _ PCS based on a PCS coding block;
step 2: determining the granularity of time slots used when a payload area of an OTN interface frame bears ODU _ PCS to be 25G according to the rate grade of the ODU _ PCS, and determining the number of the time slots required to be divided by the payload area to be 1;
the frame number of MSI is 25 frames, MSI is only transmitted in the 1 st frame, and the rest 24 frames are used as padding.
And step 3: mapping the ODU _ PCS to 1 time slot divided by the payload area of the OTN interface frame, and performing byte filling on the area of the payload area of the OTN interface frame, which exceeds the ODU _ PCS;
in the present embodiment, when the size of the payload area of the OTN interface frame is slightly larger than the ODU _ PCS, some PCS blocks in the payload area are padded with special bytes for rate adaptation.
And 4, step 4: and transmitting the OTN interface frame carrying the ODU _ PCS.
The second method comprises the following steps: based on the OTN interface frame constructed in the foregoing, GE client service data is transmitted, as shown in fig. 8, which is a schematic diagram of GE client service data transmission performed by the OTN interface frame provided in this embodiment.
Step 1: mapping GE client service data to an ODU 0;
step 2: determining that the granularity of a timeslot used when a payload area of an OTN interface frame bears an ODU0 is 12.5G according to the rate level of the ODU0, and determining the number of timeslots required to be divided by the payload area to be 20;
wherein, the time slots are interleaved based on PCS coding blocks, the frame number of MSI is 25 frames, the MSI is only transmitted in the first 20 frames, and the other 5 frames are used as padding.
And step 3: respectively mapping the ODU0 to 20 time slots divided by an OTN interface frame payload area, and performing byte filling on an area of the OTN interface frame payload area exceeding the ODU 0;
wherein, one ODU0 is directly mapped into one timeslot of 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 the ODU0, some PCS blocks in the payload area are padded with special bytes for rate adaptation.
And 4, step 4: and transmitting the OTN interface frame carrying the ODU 0.
The third method comprises the following steps: based on the OTN interface frame constructed in the foregoing, 10GE client service data is transmitted, as shown in fig. 9, which is a schematic diagram of the OTN interface frame provided in this embodiment for transmitting 10GE client service data.
Step 1: mapping 10GE client service data to ODU2 e;
step 2: determining that the granularity of a timeslot used when a payload area of an OTN interface frame bears ODU2e is 1.31G according to the rate level of the ODU2e, and determining the number of timeslots required to be divided by the payload area to be 19;
wherein, the time slots are interleaved based on PCS coding blocks, the frame number of MSI is 25 frames, the MSI is only transmitted in the first 19 frames, and the rest 6 frames are used as padding.
And step 3: respectively mapping the ODU2e to 19 time slots divided by an OTN interface frame payload area, and performing byte stuffing on an area of the OTN interface frame payload area exceeding the ODU2 e;
wherein, one ODU2e is directly mapped into 8 timeslots of the payload area of the OTN interface frame. In addition, when the size of the payload area of the OTN interface frame in this embodiment is slightly larger than the ODU2e, some PCS blocks in the payload area are padded with special bytes for rate adaptation.
And 4, step 4: and transmitting the OTN interface frame carrying the ODU2 e.
The method is as follows: and transmitting 10GE client service data and 1 12.5GE client service data based on the OTN interface frame constructed in the foregoing manner.
Step 1: mapping GE client service data to an ODU0, restoring 25GE client service data to PCS coding block data flow, and inserting overhead to form an ODU _ PCS;
step 2: determining that the supported timeslot granularity is 1.25G and 1.04G when a payload area of an OTN interface frame bears ODU0 and ODU _ PCS according to the rate grades of the ODU0 and the ODU _ PCS, and determining the number of the timeslots required to be divided by the payload area to be 22;
wherein, the time slots are interleaved based on PCS coding blocks, the frame number of MSI is 25 frames, the MSI is only transmitted in the first 22 frames, and the rest 3 frames are used as padding. The first part of the MSI is filled with a 1.25G or 1.04G time slot granularity indicator, the second part is filled with a time slot occupation situation, the third part is filled with a corresponding port number, and time slots corresponding to different time slot granularities can be continuous or discontinuous in an OTN interface frame.
And step 3: respectively mapping the ODU0 and the ODU _ PCS into 19 time slots divided by an OTN interface frame payload area, and performing byte filling on an area of the OTN interface frame payload area exceeding the ODU0 or the ODU _ PCS;
wherein, 10 ODU0 are directly mapped into 10 timeslots in the payload area of the OTN interface frame, each ODU0 corresponds to one timeslot, and 1 ODU _ PCS is directly mapped into 12 timeslots in the payload area of the OTN interface frame. In addition, when the size of the payload area of the OTN interface frame in this embodiment is slightly larger than the ODU0 or ODU _ PCS, some PCS blocks in the payload area are padded with special bytes for rate adaptation.
And 4, step 4: and transmitting the OTN interface frame carrying the ODU0 and the ODU _ PCS.
The customer service data transmission method provided by the embodiment of the invention maps the accessed customer service data to the optical channel data unit by mapping; determining the time slot granularity used by a payload area of an optical transport network interface frame bearing an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities; determining the number of time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area; and mapping the optical channel data unit to a payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame. Therefore, the division of the internal time slot is more flexible when the OTN interface frame bears different types of client service data, the decoupling with the FEC is realized, the utilization efficiency of a transmission channel is improved, and the adaptability to different types of client service data is enhanced.
Example three:
referring to fig. 10, fig. 10 is a schematic structural diagram of a client service data transmission device provided in this embodiment, including:
a first mapping module 1001, configured to map the accessed customer service data to an optical channel data unit.
In order to realize the transmission of the client service data, the client service data is first mapped to the optical channel payload unit OPUk through the first mapping module 1001, and then the OPUk is formed by adding the overhead of the OPUk, and then the ODUk is formed by adding the channel overhead of the optical channel data unit ODUk to the OPUk frame.
A time slot granularity determining module 1002, configured to determine a time slot granularity used in a payload area of an optical transport network interface frame that carries an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities.
It should be noted that, in this embodiment, the OTN interface frame is constructed by using a data format based on PCS (Physical Coding Sublayer) Coding blocks (for example, 66b blocks), an interleaving manner of a single PCS Coding block is used between time slots, for example, (K-J) overheads based on PCS Coding blocks are inserted every J PCS Coding blocks, the overheads are used for carrying corresponding path monitoring information, group management overheads, and the like, the J PCS Coding blocks form a payload area of the OTN interface frame, and the payload area supports flexible setting of different slot granularities. The PCS coding block can include but is not limited to at least one of 8b/10b and 64b/66b, and flexible selection can be carried out according to actual application scenes.
In some examples of this embodiment, the timeslot granularity determining module 1002 determines the timeslot granularity used by the payload area of the otn frame carrying the otn according to the bandwidth of the otn.
The types of the accessed client service data are different, and the rate levels of the ODUk corresponding to the client service data are also different, in this embodiment, the timeslot granularity used by the OTN interface frame to carry the ODUk is adapted according to the bandwidth of the ODUk.
A timeslot number determining module 1003, configured to determine, according to the timeslot granularity and the bandwidth of the payload area, the timeslot number that the payload area needs to be divided into.
For the OTN interface frame in this embodiment, the bandwidth of the payload area is a fixed value, and the timeslot number determining module 1003 may determine the timeslot number that the payload area needs to be divided according to the timeslot granularity.
In some examples of this embodiment, the size of the payload area is C times the least common multiple of the number of slots corresponding to the supportable plurality of different slot granularities, there is no multiple relationship between the plurality of different slot granularities, and C is an integer greater than or equal to 1.
In this embodiment, in order to meet the bearing requirements of different types of services, dynamic setting of the slot granularity is supported, so that the slot granularity or the number of slots corresponding to the slot granularity is not an integral multiple, and the size of the payload area can be divided by the number of all supported 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 timeslot granularity, at this time, the payload area needs to be padded, and the size of the payload area after the padding is removed is an integer multiple of the number of timeslots. In the case that the number of slots into which the payload region is divided is different, the size of padding in the payload region may also be different.
In an example of this embodiment, in order to improve the efficiency of the bearer service, 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 that carries an optical channel data unit, that is, determine the timeslot granularity used when an OTN interface frame carries an ODUk as the minimum timeslot granularity, and correspondingly, the timeslot number determining module 1003 determines, according to the minimum timeslot granularity and a bandwidth of the payload area, a maximum timeslot number N1 that the payload area needs to be divided; for example, when carrying one of the customer service data, the minimum time slot granularity required for calculating the customer service data is TSG1Will TSG1The corresponding timeslot number N1 is the maximum supported timeslot number of the OTN interface frame in this embodiment, and when it is further required to support bearers of other types of customer service data, in the TSG1On the basis of the time slot granularity TS required by other customer service dataGxTo meet the requirement of bearing other customer service data, the time slot granularity is TSGxIts corresponding number of time slots Nx, where TSGxGreater than TSG1Nx is smaller than N1, and then, the load of different customer service data meeting the conditions is calculated and divided respectivelyThe number of timeslots N1, N2.. said., Np, the least common multiple C of Np, then the size of the payload area of the OTN interface frame in this embodiment may be represented as q × C, q being an integer greater than or equal to 1. In addition, it should be further noted that, in order to reduce the hardware implementation complexity in practical applications, in an example in this embodiment, the number of different slot granularities supported by the OTN interface frame may be limited to p, where p is an integer greater than or equal to 1.
In addition, in practical applications, as a preferred example in this embodiment, an MSI frame number determining module is further included, configured to determine, from a maximum value N1 of multiple different numbers of time slots supported by the payload region, a frame number indicating MSI for the multiplexing structure of multiple payload branches of the payload region. And indicating a plurality of payload branches of a payload area of an OTN interface frame by adopting a multiplexing structure indication method, wherein the frame number of the MSI is the number N1 of all the maximum time slots supported by the OTN interface frame.
It should also be noted that, in some examples of this embodiment, an MSI setting module is further included, configured to perform padding reservation on remaining N1-Nx frame data of the MSI indicated by the multiplexing structure when the number Nx of time slots corresponding to the time slot granularity of the optical channel data unit mapped by the accessed customer service data is less than N1.
It should be understood that in practical applications, the slot granularity is a single slot granularity or a mixed slot granularity including a plurality of slot granularities.
For the condition of single time slot granularity, the MSI is consistent with the MSI of the traditional OTN interface frame; for the mixed slot granularity, the MSI may be divided into three parts, where the first part is a slot granularity indication area for indicating the slot bandwidth corresponding to the slot, the second part is a slot occupancy indication area for indicating the occupancy of the slot, and the third part is a slot port number indication area for indicating the slot port number.
A second mapping module 1004, configured to map the optical channel data unit into a payload area of the optical transport network interface frame.
The transmitting module 1005 is configured to transmit the optical transport network interface frame.
In this embodiment, the transmission of the client service data is performed by establishing a transmission channel adapted to the bandwidth of the client service data, so that the utilization rate of the payload bandwidth of the OTN interface frame is improved, and M PCS coding blocks of the OTN interface frame in this embodiment may be combined according to actual needs to perform FEC coding, which has a decoupling capability with FEC, thereby better ensuring that the transmission rates of different types of client service data are backward compatible.
In addition, in practical application, the present embodiment may further include: the mark insertion module is used for carrying out code conversion on the payload area and the overhead part of the interface frame of the optical transport network according to the FEC type; FEC encoding is carried out on the data stream after code conversion; and inserting a channel alignment mark and/or a code word mark into the FEC-coded data stream.
The customer service data transmission device provided by the embodiment of the invention maps the accessed customer service data to the optical channel data unit by mapping; determining the time slot granularity used by a payload area of an optical transport network interface frame bearing an optical channel data unit; the optical transport network interface frame is constructed based on a PCS coding block with a fixed format, and a payload area can support a plurality of different time slot granularities; determining the number of time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area; and mapping the optical channel data unit to a payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame. Therefore, the division of the internal time slot is more flexible when the OTN interface frame bears different types of client service data, the decoupling with the FEC is realized, the utilization efficiency of a transmission channel is improved, and the adaptability to different types of client service data is enhanced.
Example four:
referring to fig. 11, fig. 11 is a schematic structural diagram of an optical transport network device provided in this embodiment, including a processor 1101, a memory 1102 and a communication bus 1103;
the communication bus 1103 is used for implementing connection 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 processes of the client service data transmission method in the foregoing embodiments of the present invention, which are not described herein again.
Fifth embodiment
This embodiment provides a computer-readable storage medium, where one or more computer programs are stored in the computer-readable storage medium, and the computer programs may be executed by one or more processors to implement the client service data transmission method in the foregoing embodiments, which is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the invention described above may be implemented in a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented in program code executable by a computing device, such that they may be stored on a computer storage medium (ROM/RAM, magnetic disk, optical disk) and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a more detailed description of embodiments of the present invention, and the present invention is not to be considered limited to such descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. A method of customer service data delivery, comprising:
mapping the accessed customer service data to an optical channel data unit;
determining the time slot granularity used by a payload area of an optical transport network interface frame bearing the optical channel data unit; the interface frame of the optical transport network is constructed based on a PCS coding block with a fixed format, and the payload area can support a plurality of different time slot granularities;
determining the number of time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area, wherein the current time slot granularity adopted by the payload area is indicated by a multiplexing structure indication MSI;
and mapping the optical channel data unit to the payload area of the optical transport network interface frame, and transmitting the optical transport network interface frame.
2. The method of claim 1, wherein the determining the slot granularity used in the payload section of the otn frame carrying the otn data unit comprises:
and determining the time slot granularity used by a payload area of an optical transport network interface frame carrying the optical channel data unit according to the bandwidth of the optical channel data unit.
3. The method as claimed in claim 1, wherein the size of the payload area is C times the least common multiple of the number of timeslots corresponding to the supportable plurality of different timeslot granularities, there is no multiple relationship between the plurality of different timeslot granularities, and C is an integer greater than or equal to 1.
4. The customer service data transfer method of claim 1 further comprising: carrying out coding conversion on a payload area and an overhead part of the optical transport network interface frame according to the FEC type; FEC encoding is carried out on the data stream after code conversion; and inserting a channel alignment mark and/or a code word mark into the FEC coded data stream.
5. The customer service data transmission method according to any of claims 1 to 4, wherein the PCS coding block comprises at least one of 8b/10b, 64b/66 b.
6. A client service data transmission apparatus, comprising:
the first mapping module is used for mapping the accessed customer service data to an optical channel data unit;
a time slot granularity determining module, configured to determine a time slot granularity used by a payload area of an optical transport network interface frame carrying the optical channel data unit; the interface frame of the optical transport network is constructed based on a PCS coding block with a fixed format, the payload area can support a plurality of different time slot granularities, and the different time slot granularities are indicated by a multiplexing structure indication MSI;
the time slot number determining module is used for determining the number of the time slots required to be divided by the payload area according to the time slot granularity and the bandwidth of the payload area;
a second mapping module, configured to map the optical channel data unit into the payload area of the otn interface frame;
and the transmission module is used for transmitting the optical transmission network interface frame.
7. The client service data transmission apparatus of claim 6, wherein the size of the payload area is C times the least common multiple of the number of timeslots corresponding to the supportable plurality of different timeslot granularities, there is no multiple relationship between the plurality of different timeslot granularities, and C is an integer greater than or equal to 1.
8. The customer service data transmission means according to claim 6 or 7 wherein the PCS coding block comprises at least one of 8b/10b, 64b/66 b.
9. An optical transport network device, the optical transport network device comprising a processor, a memory and a communication bus;
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is adapted to execute one or more programs stored in the memory to implement the steps of the method of customer service data transfer of any of claims 1 to 5.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores one or more programs which are executable by one or more processors to implement the steps of the method of client traffic data transmission according to any one of claims 1 to 5.
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