WO2022152012A1

WO2022152012A1 - Client service bearing method and apparatus

Info

Publication number: WO2022152012A1
Application number: PCT/CN2022/070151
Authority: WO
Inventors: 张源斌; 苑岩
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-01-18
Filing date: 2022-01-04
Publication date: 2022-07-21
Also published as: CN112865911A

Abstract

Provided are a client service bearing method and apparatus. The method comprises: mapping a client service to an identification frame, wherein the identification frame is composed of a fixed number of coding blocks, which comprise frame header blocks and frame payload blocks; and mapping the identification frame to a service layer signal. In the present invention, a client service is first mapped to an identification frame, and the identification frame is then mapped to a service layer signal, such that a client service with a smaller bandwidth granularity is borne in an OTN.

Description

Client service bearing method and device

technical field

Embodiments of the present invention relate to the field of communications, and in particular, to a method and device for carrying client services.

Background technique

In the definition of the existing Optical Transport Network (OTN), the method of loading multiple service signals into the OTN signal payload is to divide the OTN signal payload into n time slots, as shown in Figure 1 As shown, the service signal is then loaded into one or more time slots in the signal payload of the optical transport network, and the time slots are implemented in the manner of byte interleaving.

According to the existing optical transport network standard G.709, the minimum time slot granularity of the existing OTN technology is 1.25G. This time slot granularity is used to carry services lower than 1.25G, such as FE, STM-1, E1, etc. , the bandwidth waste is very serious, for example, the E1 signal is 2M, and it is installed in the 1.25G time slot, and the bandwidth waste is as high as 99% or more. Therefore, a transmission technology is required to implement a method for efficiently carrying small-granularity services in OTN. A research hotspot in the industry is to use the Optical Service Unit (OSU) to carry small-granularity services, and use the Payload Block (PB) to divide the OTN frame payload area. As shown in Figure 2, the customer service is first mapped To OSU, OSU is mapped to PB. For VC-n (Virtual Container, virtual container) service, its rate is relatively low, and there is no independent frame header, how to carry this type of signal needs further research.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a client service bearing method and device, so as to at least solve the problem of how to bear packet client services with smaller bandwidth granularity in the related art.

According to an embodiment of the present invention, a method for carrying client services is provided, including: mapping client services to identification frames, wherein the identification frames are composed of a fixed number of coding blocks, including frame header blocks and frame payload blocks ; Mapping the identification frame into the service layer signal.

In an exemplary embodiment, the frame header block includes a synchronization header, an overhead area and a payload area, the frame payload block includes a synchronization header and a payload area, the frame header block and the frame payload block The payload area of the frame header is used to carry the client service, and the overhead area of the frame header block is used to bear at least one of the following fields: control block type, number information of the client service, control block identification information, and reservation information.

In an exemplary embodiment, the identification frame further includes a frame trailer block, the frame trailer block includes a synchronization header, an overhead area and a payload area, and the payload area of the frame trailer block is used to carry the client service , the overhead area of the frame trailer block is used to carry at least one of the following fields: control block type, number information of customer services, control block identification information, and reserved information.

In an exemplary embodiment, mapping the identification frame into the service layer signal includes mapping the identification frame to a data frame, wherein the data frame is composed of a fixed number of coded blocks, including a data frame header block and data frame payload block, the frame header block of the data frame includes a synchronization header and an overhead area, and the overhead area is used to carry at least one of the following fields: control block type, number information of customer services, control block identification information , clock information, reservation information; the payload code block of the data frame is used to carry the identification frame and the padding code block; the data frame is mapped to the service layer signal.

In an exemplary embodiment, the clock information is the number of bytes of the client service carried between the last data frame and the current data frame or the sending time of the client service.

In an exemplary embodiment, the data frame further includes a frame trailer block including a sync header, a control block type, and a fixed sequence padding.

In an exemplary embodiment, mapping the data frame to the service layer signal includes: interleaving p data frames in units of coding blocks to form a data frame group, where P is an integer greater than 1; The frame group is mapped to the service layer signal by means of a bit-synchronous mapping procedure (Bit-synchronous Mapping Procedure, BMP).

In an exemplary embodiment, the number of data frames carried in the payload area of the service layer signal is carried in the overhead area of the service layer signal.

In an exemplary embodiment, the method further includes: extracting the client service from the service layer signal by demapping at the receiving side through the following steps: demapping an OSU frame from the ODU; extracting the OSU frame from the OSU The identification frame is demapped from the frame, and the synchronization header of the identification frame is located; the frame header block of the identification frame is located, and the client service is extracted from the identification frame.

In an exemplary embodiment, the method further includes: extracting the client service from the service layer signal by demapping at the receiving side by performing the following steps: demapping the data frame from the service layer signal; Locating the synchronization header of the data frame; locating the frame header block of the data frame, and obtaining clock information from the frame header block of the data frame; deciphering from the data frame according to the clock information The identification frame is mapped out, and the client traffic is extracted from the identification frame.

In an exemplary embodiment, the method further includes: extracting the client traffic from the service layer signal by demapping at the receiving side by performing the following steps: demapping the data frame group from the service layer signal , deinterleaving the data frame group in coding blocks to obtain a data frame; de-map the identification frame and clock information from the data frame, and extract the client service from the identification frame according to the clock information.

According to another embodiment of the present invention, there is provided an apparatus for carrying client services, including: a first mapping module configured to map client services to identification frames, wherein the identification frames are composed of a fixed number of coding blocks, including a frame header block and a frame payload block; and a second mapping module, configured to map the identification frame into a service layer signal.

In an exemplary embodiment, the second mapping module comprises: a first mapping unit configured to map the identification frame to a data frame, wherein the data frame consists of a fixed number of coding blocks, including the data frame A frame header block and a data frame payload block, the frame header block of the data frame includes a synchronization header and an overhead area, and the overhead area is used to carry at least one of the following fields: control block type, number information of customer services, control block identification information, clock information and reservation information; the payload code block of the data frame is used to carry the identification frame and the padding code block; the second mapping unit is configured to map the identification frame to the service layer signal.

In an exemplary embodiment, the second mapping module includes: an interleaving unit, configured to interleave p data frames in units of coding blocks to form a data frame group, where P is an integer greater than 1; a third mapping unit , set to map the data frame group to the service layer signal by means of BMP.

According to yet another embodiment of the present invention, a computer-readable storage medium is also provided, and a computer program is stored in the computer-readable storage medium, wherein the computer program is configured to execute any one of the above methods when running steps in the examples.

According to yet another embodiment of the present invention, there is also provided an electronic device comprising a memory and a processor, wherein the memory stores a computer program, the processor is configured to run the computer program to execute any of the above Steps in Method Examples.

In the above-mentioned embodiment of the present invention, the customer service is first mapped to the identification frame, and then the identification frame is mapped to the service layer signal, thereby realizing the bearing of the customer service with smaller bandwidth granularity in the OTN.

Description of drawings

1 is a schematic diagram of the time slot division of an OTN frame according to the related art;

Fig. 2 is a schematic diagram of dividing an OTN frame into PB according to the related art;

3 is a schematic structural diagram of a computer terminal according to an embodiment of the present invention;

FIG. 4 is a flowchart of a method for carrying a client service according to an embodiment of the present invention;

5 is a schematic diagram of a VC-n identification frame according to an embodiment of the present invention;

6 is a schematic diagram of a VC-n identification frame according to another embodiment of the present invention;

7 is a schematic diagram of a VC-n data frame according to an embodiment of the present invention;

8 is a schematic diagram of a VC-n data frame group signal according to an embodiment of the present invention;

9 is a schematic structural diagram of a client service bearing device according to an embodiment of the present invention;

10 is a flowchart of a method for carrying a client service according to Embodiment 1 of the present invention;

11 is a schematic diagram of a VC-n identification frame according to Embodiment 1 of the present invention;

12 is a flowchart of a method for carrying a client service according to Embodiment 2 of the present invention;

13 is a schematic diagram of a VC-12 identification frame according to Embodiment 2 of the present invention;

14 is a schematic diagram of a VC-12 data frame according to Embodiment 2 of the present invention;

15 is a flowchart of a method for carrying a client service according to Embodiment 3 of the present invention;

16 is a schematic diagram of a VC-12 identification frame according to Embodiment 3 of the present invention;

17 is a schematic diagram of a VC-12 data frame according to Embodiment 3 of the present invention;

FIG. 18 is a schematic diagram of a VC-12 data frame group according to Embodiment 3 of the present invention.

Detailed ways

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence.

The method embodiments provided in the embodiments of this application may be executed in a mobile terminal, a computer terminal, or a similar computing device. Taking running on a computer terminal as an example, FIG. 3 is a block diagram of a hardware structure of a computer terminal according to an embodiment of the present invention. As shown in FIG. 3 , the computer terminal may include one or more (only one is shown in FIG. 3 ) processor 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the above-mentioned computer terminal may also include a transmission device 106 and an input and output device 108 for communication functions. Those of ordinary skill in the art can understand that the structure shown in FIG. 3 is only a schematic representation, which does not limit the structure of the above-mentioned computer terminal. For example, the computer terminal may also include more or fewer components than shown in FIG. 3 , or have a different configuration than that shown in FIG. 3 .

The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as computer programs corresponding to the methods in the embodiments of the present invention, and the processor 102 executes various functions by running the computer programs stored in the memory 104. Application and data processing, that is, to realize the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, memory 104 may further include memory located remotely from processor 102, which may be connected to a computer terminal through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

Transmission means 106 are used to receive or transmit data via a network. The specific example of the above-mentioned network may include a wireless network provided by the communication provider of the computer terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC for short), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (Radio Frequency, RF for short) module, which is used to communicate with the Internet in a wireless manner.

With the process of IP-based services, the main customer service faced by OTN will be packet services. How to carry packet customer services smaller than 1G in OTN is one of the hot issues being discussed in the industry. At present, the industry has launched a technology research based on sub1G And the standard project, OSU is a container that carries sub1G, but there is no perfect solution for how to use OSU to carry customer services.

To this end, this embodiment provides a client service bearing method that can run on the above-mentioned computer terminal. FIG. 4 is a flowchart of a client service bearing method according to an embodiment of the present invention. As shown in FIG. 4 , the process includes the following step:

Step S402, mapping the customer service to the identification frame;

Step S404, mapping the identification frame to the service layer signal.

In this embodiment, the identification frame may be composed of a fixed-length coding block, the coding block may include a control coding block and a data coding block, and the service layer signal may be a container with a fixed frame length and a fixed rate, such as ODU and OSU, and the coding block length Can be 66b, 512b, etc.

In this embodiment, the identification frame may be composed of k 66b coded blocks, including a frame header block and a frame payload block, and the frame header block of the identification frame includes a synchronization header 10, an overhead area (M1 bytes) and or a net payload area (X1 bytes), the overhead area is used to carry at least one of the following fields: control block type, number information of customer services, control block identification information, the overhead area may also include reserved information, the payload The area is used to carry client services; the frame payload block of the identification frame includes a synchronization header 01 and an 8-byte payload area. For the mapping method of the customer service with the length of N bytes to the identification frame, the first X1 bytes of the customer service are sequentially carried into the payload area of the frame header block of the identification frame, and the last N bytes of the customer service are - X1 bytes are carried to the payload area in the frame payload block of the identification frame, where 0≤X1≤8, as shown in Figure 5.

In this embodiment, the identification frame may further include a frame trailer block, and the frame trailer block of the identification frame includes a synchronization header 10, an overhead area (M2 bytes) and or a payload area (X2 bytes), The overhead area is used to carry at least one of the following fields: control block type, number information of customer services, and control block identification information, and the overhead area may also include reserved information. The mapping method for a client service with a length of N bytes to an identification frame is to carry the first X1 bytes of the client service into the payload area of the frame header block of the identification frame, and the middle N-X1- X2 bytes are carried to the payload area of the frame payload block of the identification frame, and the last X2 bytes of the customer service are carried to the payload area of the frame trailer block of the identification frame, where 0≤X1≤8,0 ≤X2≤8, as shown in Figure 6.

In this embodiment, after the client service is mapped to the identification frame, the rate of the identification frame is the client service rate*(M+N)/N*(66/64), where M is all overhead bytes in the identification frame . The identification frame is mapped into the OSU frame. On the receiving side, the identification frame is de-mapped from the OSU frame, the 66b synchronization header is positioned, and then the frame header of the identification frame is positioned to recover the client service.

In this embodiment, before the identification frame is mapped to the service layer signal, it may further include: mapping the identification frame to a data frame, the data frame is a frame structure generated by the local clock according to the service layer signal payload rate, and a fixed It is composed of 66b coding blocks of number j, including a data frame header block and a data frame payload block. The data frame header block includes a synchronization header 10 and an overhead area, and the overhead area is used to carry at least one of the following fields: control block type, number information of client services, control block identification information, clock information, and the overhead area may also include reserved information. The data frame payload code block is used to carry the identification frame and or 66b padding code block. As shown in Figure 7.

Since the rate of the identification frame is lower than that of the data frame, when the identification frame is mapped to the data frame, a fixed padding block of 66b needs to be added for rate adaptation. In order to perform clock recovery at the receiving end, the clock information needs to be carried in the frame of the data frame. In the header block, the clock information is the number of bits of the client service carried between the last data frame and the current data frame or the sending time of the client service, and the fixed padding code block may be an Idle code block.

In this embodiment, for p (p≥1) client services of the same rate level, each client service is first mapped to a corresponding identification frame according to the above method, and then the identification frame is mapped to a data frame, where each client service is mapped to a corresponding identification frame. Each customer service has its own customer service number, and p data frames are interleaved in units of 66b blocks to form a data frame group. As shown in Figure 8, the data frame group is mapped to the service layer signal. On the receiving side, the data frame group is de-mapped from the service layer signal, the data frame group is de-interleaved in units of 66b blocks to obtain the data frame, the identification frame and clock information are de-mapped from the data frame, and the identification frame is de-mapped from the identification frame. Extract customer business.

In another embodiment, the frame header blocks of the p data frames may be aligned first, and then interleaved in units of 66b to form a data frame group signal, and the data frame group signal may be mapped to the OSU frame by means of BMP. On the receiving side, the data frame group is obtained by de-demapping from the service layer signal, and the frame header of the data frame group is positioned. The identification frame and clock information are de-mapped from the frame, and the customer service is extracted from the identification frame.

From the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products are stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present invention.

In this embodiment, a client service bearer device is also provided, and the device is used to implement the above-mentioned embodiments and preferred implementations, and what has been described will not be repeated. As used below, the terms "module" and "unit" may be a combination of software and/or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, implementations in hardware, or a combination of software and hardware, are also possible and contemplated.

Fig. 9 is a structural block diagram of a client service bearing apparatus according to an embodiment of the present invention. As shown in Fig. 9 , the apparatus includes a first mapping module 10 and a second mapping module 20.

The first mapping module 10 is configured to map the client traffic to the identification frame, and the second mapping module 20 is configured to map the identification frame to the service layer signal.

In this embodiment, the identification frame may be composed of multiple fixed-length coding blocks, including a frame header block and a frame payload block. The frame header block includes a synchronization header, an overhead area, and a payload area. The payload block includes a synchronization header and a payload area, the frame header block and the payload area of the frame payload block are used to carry the client service, and the overhead area of the frame header block is used to carry at least one of the following fields : Control block type, serial number information of customer service, control block identification information, reserved information.

In an exemplary embodiment, the second mapping module may further include: a first mapping unit configured to map the identification frame to a data frame, wherein the data frame is composed of a fixed number of coding blocks, including Data frame header block and data frame payload block, the frame header block of the data frame includes a synchronization header and an overhead area, and the overhead area is used to carry at least one of the following fields: control block type, number information of customer services, Control block identification information, clock information, and reservation information; the payload code block of the data frame is used to carry an identification frame and a padding code block; a second mapping unit, configured to map the identification frame to the service layer signal .

In an exemplary embodiment, the data frame may further include a frame trailer block, and the frame trailer block includes a synchronization header, a control block type, and a fixed sequence padding, and the fixed padding sequence may be an all-0 sequence or an all-1 sequence, Or a user-configurable sequence with a fixed pattern.

In an exemplary embodiment, the second mapping module may further include: an interleaving unit, configured to interleave p data frames in units of coding blocks to form a data frame group, where P is an integer greater than 1; a third The mapping unit is configured to map the data frame group to the OSU frame by means of BMP; the fourth mapping unit is configured to map the OSU frame to the ODU.

It should be noted that the above modules can be implemented by software or hardware, and the latter can be implemented in the following ways, but not limited to this: the above modules are all located in the same processor; or, the above modules can be combined in any combination The forms are located in different processors.

In order to facilitate the understanding of the technical solutions provided by the present invention, the following description will be given in conjunction with embodiments of specific scenarios.

Example 1

In this embodiment, the VC-12 signal is mapped to the OSU frame as an example. In this embodiment, the VC-12 rate is 2.24 Mbps, the frame length is 140 bytes, the OSU frame rate is 2.6 Mbps, the frame length is 192 bytes, and the payload size is 185 bytes. As shown in Figure 10, this embodiment includes the following steps:

Step S1001, in the construction of the VC-12 identification frame, the VC-12 identification frame is composed of 18 66b coding blocks, including the frame header block and the frame payload block, and the first 66b coding block of the VC-12 identification frame is the frame header. The block, whose synchronization header is 10, includes a 4-byte overhead area and a 4-byte payload area, the overhead area is used to carry one-byte control block type 0x1e, one-byte VC number information VC_NO=1 , and two bytes of reserved information, VC-12 identifies the 2nd to 18th 66b encoded blocks in the frame as the frame payload block, and its synchronization header is 01.

Step S1002, the VC-12 service frame is mapped to the VC-12 identification frame, that is, the first 4 bytes of the VC-12 service frame are carried in the payload area of the frame header block of the VC-12 identification frame, and the VC-12 The remaining 136 bytes of the service frame are carried in the payload area of the frame payload block of the 2nd to 18th VC-12 identification frames, as shown in Figure 11.

Step S1003, after the VC-12 service frame is mapped to the VC-12 identification frame, the rate is 2.24*144/140*66/64=2.376Mbps, and the payload rate of the OSU frame is 2.6*185/192=2.502Mbps.

Step S1004, according to the two rates of step S1003, calculate the maximum number of bytes 176 and the minimum number of bytes 175 occupied when mapping the VC-12 identification frame to the OSU frame, and map them into the OSU frame, and convert the clock information It is carried in the overhead area of the OSU frame, and then the OSU is mapped into the ODU.

Step S1005, demap OSU from ODU, demap VC-12 identification frame from OSU frame, perform synchronization header positioning of 66b code block, and then perform frame header block positioning of VC-12 identification frame to complete VC-12 After identifying the positioning of the frame header, the VC-12 service is obtained from the VC-12 frame.

Embodiment 2

In this embodiment, the VC-12 signal is mapped to the OSU frame as an example. In this embodiment, the VC-12 rate is 2.24 Mbps, the frame length is 140 bytes, the OSU frame rate is 2.6 Mbps, the frame length is 192 bytes, and the payload size is 185 bytes.

As shown in Figure 12, this embodiment may include the following steps:

In step S1201, the VC-12 identification frame is constructed, which consists of 18 66b coding blocks, and the VC-12 identification frame is composed of 18 66b coding blocks, including frame header block, frame payload block and frame trailer block. 12 Identify the first 66b encoded block of the frame as a frame header block, whose synchronization header is 10, including a 3-byte overhead area and a 5-byte payload area, which is used to carry a one-byte control block type 0x78, one byte of VC number information VC_NO=1, and one byte of reserved information, VC-12 identifies the 2nd to 17th 66b encoded blocks in the frame as frame payload blocks, and its synchronization header is 01, VC- 12 Identify the 18th 66b encoded block of the frame as a frame end block, and its synchronization header is 10, including a 1-byte overhead area and a 7-byte payload area, which is used to carry a one-byte control block type 0xFF.

Step S1202, map the VC-12 service frame to the VC-12 identification frame, that is, to carry the first 3 bytes of the VC-12 service frame in the payload area of the frame header block of the VC-12 identification frame, and convert the VC-12 The 128 bytes in the middle of the service frame are carried in the payload area of the frame payload block of the 2nd to the 17th VC-12 identification frame, and the last 7 bytes of the VC-12 service frame are carried in the 2nd to the 17th. 18 VC-12s are identified in the payload area of the end block of the frame, as shown in Figure 13.

Step S1203, after the VC-12 service frame is mapped to the VC-12 identification frame, its rate is 2.24*144/140*66/64=2.376Mbps, and the payload rate of the OSU frame is 2.6*185/192=2.502Mbps.

Step S1204, constructing a VC-12 data frame, the rate of which is OSU frame payload rate=2.6*185/192=2.502Mbps, which consists of 64 66b coding blocks, and the first 66b coding block is the VC-12 data frame. The frame header block, whose synchronization header is 10, includes an 8-byte overhead area, which is used to carry a one-byte control block type 0x1e, and a one-byte control block identification information 0x02 (used for performing with the Idle block. Distinguishing), one byte of VC number information VC_NO=1, two bytes of clock information and three bytes of reserved information, the 2nd to 64th 66b coding blocks are the frame payload blocks of the VC-12 data frame , its sync header is 01.

In addition, in this embodiment, the VC-12 data frame may further include a frame trailer block, and the frame trailer block may include a synchronization header, a control block type and a fixed sequence padding. The fixed padding sequence can be an all-zeros sequence, an all-ones sequence, or a user-configurable sequence with a fixed pattern.

Step S1205, insert the VC-12 identification frame into the Idle block and map it to the frame payload block of the VC-12 data frame, and map the VC-12 data between the previous VC-12 data frame and the current VC-12 data frame. The number of bytes is carried as the clock information in the frame header block of the VC-12 data frame, as shown in Figure 14.

Step S1206, the VC-12 data frame is mapped to the OSU frame by means of BMP, and the OSU frame is mapped to the ODU.

Step S1207, demap OSU from ODU, demap VC-12 data frame from OSU frame, perform synchronization header positioning of 66b code block, perform VC-12 data frame header block positioning, and extract VC-12 data frame from VC-12 data frame. The clock information is obtained from the frame header block of the frame, and the identification and deletion of the Idle code block is performed to obtain the VC-12 identification frame, and the frame header block positioning of the VC-12 identification frame is performed. The VC-12 service is acquired in the -12 frame.

Embodiment 3

In this embodiment, five VC-12 signals are mapped into a 13Mbps OSU frame, where the VC-12 rate is 2.24Mbps, the frame length is 140 bytes, the OSU frame rate is 2.6Mbps, and the frame length is 192 bytes section, the payload size is 185 bytes.

As shown in Figure 15, this embodiment may include the following steps:

Step S1501, in the construction of the VC-12 identification frame, the VC-12 identification frame is composed of 18 66b coding blocks, including the frame header block and the frame payload block, and the first 66b coding block of the VC-12 identification frame is the frame header. block, whose synchronization header is 10, including a 4-byte overhead area and a 4-byte payload area, the overhead area is used to carry a one-byte control block type 0x1e, and the one-byte VC number information is VC_NO =1, VC_NO=2, VC_NO=3, VC_NO=4 and VC_NO=5, one-byte control block identification information 0x01 (used to distinguish from the Idle block and the frame header block of the VC-12 data frame), and a Byte reserved information, VC-12 identifies the 2nd to 18th 66b encoded blocks in the frame as the frame payload block, and its synchronization header is 01.

Step S1502, mapping each VC-12 service frame to the corresponding VC-12 identification frame, that is, carrying the first 4 bytes of the VC-12 service frame in the payload area of the frame header block of the VC-12 identification frame, The remaining 136 bytes of the VC-12 service frame are carried in the payload area of the frame payload block of the 2nd to 18th VC-12 identification frames, as shown in Figure 16.

Step S1503, after the VC-12 service frame is mapped to the VC-12 identification frame, the rate is 2.24*144/140*66/64=2.376Mbps, and the payload rate of the OSU frame is 2.6*185/192=2.502Mbps.

Step S1504, constructing a VC-12 data frame, the rate of which is OSU frame payload rate=2.6*185/192=2.502Mbps, which consists of 64 66b coding blocks, the first 66b coding block is the VC-12 data frame. The frame header block, whose synchronization header is 10, includes an 8-byte overhead area, which is used to carry a one-byte control block type 0x1e, a one-byte control block identification information 0x02 (for use with the Idle block and VC-12 identifies the frame header block to distinguish), the VC number information of one byte is VC_NO=1, VC_NO=2, VC_NO=3, VC_NO=4 and VC_NO=5, two bytes of clock information and three 2 bytes of reserved information, the 2nd to 64th 66b coding blocks are the frame payload blocks of the VC-12 data frame, and the synchronization header is 01.

Step S1505, insert the VC-12 identification frame into the Idle block and map it to the frame payload block of the VC-12 data frame, and map the VC-12 data frame between the previous VC-12 data frame and the current VC-12 data frame. The number of bytes is carried as the clock information in the frame header block of the VC-12 data frame, as shown in Figure 17.

Step S1506, interleave the five VC-12 data frames in units of 66b code blocks to form a VC-12 data frame group, as shown in Figure 18, the rate of which is 2.6*185/192*5=12.526Mbps. The VC-12 data frame group is mapped to the OSU frame through the BMP, and the OSU frame is mapped to the ODU.

Step S1507, demapping the OSU signal from the ODU, demapping the VC-12 data frame group signal from the OSU signal, and deinterleaving the VC-12 data frame group signal in units of 66b code blocks to obtain 5 VC-12 data frame, perform 66b synchronization header positioning for each VC-12 data frame, then identify the VC-12 data frame header block and 66bIdle code block, extract the clock information from the VC-12 data frame header, and delete the VC-12 After the frame header block of the data frame and the 66bIdle code block, the VC-12 identification frame is obtained, the frame header of the VC-12 identification frame is positioned, and then the VC-12 service frame is obtained from the VC-12 identification frame.

Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

In an exemplary embodiment, the above-mentioned computer-readable storage medium may include, but is not limited to, a USB flash drive, a read-only memory (Read-Only Memory, referred to as ROM for short), and a random access memory (Random Access Memory, referred to as RAM for short) , mobile hard disk, magnetic disk or CD-ROM and other media that can store computer programs.

An embodiment of the present invention also provides an electronic device, comprising a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any of the above method embodiments.

In an exemplary embodiment, the above-mentioned electronic device may further include a transmission device and an input-output device, wherein the transmission device is connected to the above-mentioned processor, and the input-output device is connected to the above-mentioned processor.

For specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and exemplary implementation manners, and details are not described herein again in this embodiment.

Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computing device, which can be centralized on a single computing device, or distributed in a network composed of multiple computing devices On the other hand, they can be implemented in program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, can be performed in a different order than shown here. Or the described steps, or they are respectively made into individual integrated circuit modules, or a plurality of modules or steps in them are made into a single integrated circuit module to realize. As such, the present invention is not limited to any particular combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention shall be included within the protection scope of the present invention.

Claims

A method for carrying customer services, comprising:

mapping the client service to an identification frame, wherein the identification frame is composed of a fixed number of coding blocks, including a frame header block and a frame payload block;

The identification frame is mapped into a service layer signal.
The method of claim 1, wherein the frame header block includes a synchronization header, an overhead area and a payload area, the frame payload block includes a synchronization header and a payload area, the frame header block and the frame The payload area of the payload block is used to carry the client service, and the overhead area of the frame header block is used to carry at least one of the following fields: control block type, number information of the client service, control block identification information, and reserved information.
The method according to claim 2, wherein the identification frame further comprises a frame trailer block, the frame trailer block includes a synchronization header, an overhead area and a payload area, and the payload area of the frame trailer block is used to carry all The client service, the overhead area of the frame trailer block is used to carry at least one of the following fields: control block type, number information of the client service, control block identification information, and reservation information.
The method of claim 1, wherein mapping an identification frame to the service layer signal comprises:

mapping the identification frame to a data frame, wherein the data frame is composed of a fixed number of coding blocks, including a data frame header block and a data frame payload block, and the frame header block of the data frame includes a synchronization header and an overhead area, the overhead area is used to carry at least one of the following fields: control block type, number information of customer services, control block identification information, clock information, reservation information; the payload block of the data frame is used to carry identification frames and padding block;

A data frame is mapped into the service layer signal.
The method according to claim 4, wherein the clock information is the number of bytes of the client service carried between the last data frame and the current data frame or the sending time of the client service.
5. The method of claim 4, wherein the data frame further comprises a frame trailer block including a sync header, a control block type, and a fixed sequence padding.
The method of claim 4, wherein mapping a data frame into the service layer signal comprises:

The p data frames are interleaved in units of coding blocks to form a data frame group, where P is an integer greater than 1;

The data frame group is mapped to the service layer signal by means of BMP.
The method of claim 7, further comprising:

The number of data frames carried in the payload area of the service layer signal is carried in the overhead area of the service layer signal.
The method according to claim 4, further comprising: extracting the client service from the service layer signal by de-mapping at the receiving side through the following steps:

Demap the data frame from the service layer signal;

positioning the synchronization header of the data frame;

Positioning the frame header block of the data frame, and obtaining clock information from the frame header block of the data frame;

The identification frame is demapped from the data frame according to the clock information, and the client service is extracted from the identification frame.
The method according to claim 7, further comprising: extracting the client service from the service layer signal by de-mapping at the receiving side through the following steps:

Demap the data frame group from the service layer signal, and deinterleave the data frame group in units of coding blocks to obtain data frames;

The identification frame and clock information are de-mapped from the data frame, and the client service is extracted from the identification frame according to the clock information.
A client service bearing device, comprising:

a first mapping module, configured to map the customer service to an identification frame, wherein the identification frame is composed of a fixed number of coding blocks, including a frame header block and a frame payload block;

The second mapping module is configured to map the identification frame to the service layer signal.
The apparatus of claim 11, wherein the frame header block includes a synchronization header, an overhead area and a payload area, the frame payload block includes a synchronization header and a payload area, the frame header block and the frame The payload area of the payload block is used to carry the client service, and the overhead area of the frame header block is used to carry at least one of the following fields: control block type, number information of the client service, control block identification information, and reserved information.
The apparatus according to claim 12, wherein the identification frame further comprises a frame trailer block, the frame trailer block includes a synchronization header, an overhead area and a payload area, and the payload area of the frame trailer block is used to carry all The client service, the overhead area of the frame trailer block is used to carry at least one of the following fields: control block type, number information of the client service, control block identification information, and reservation information.
The apparatus of claim 12, wherein the second mapping module comprises:

The first mapping unit is configured to map the identification frame to a data frame, wherein the data frame is composed of a fixed number of coding blocks, including a data frame header block and a data frame payload block, and the data frame frame The header block includes a synchronization header and an overhead area, and the overhead area is used to carry at least one of the following fields: control block type, number information of customer services, control block identification information, clock information, and reservation information; the payload of the data frame Code blocks are used to carry identification frames and padding code blocks;

A second mapping unit, configured to map the identification frame to the service layer signal.
15. The apparatus of claim 14, wherein the data frame further comprises a frame trailer block including a sync header, a control block type, and a fixed sequence padding.
The apparatus of claim 14, wherein the second mapping module comprises:

an interleaving unit, configured to interleave p data frames in units of coding blocks to form a data frame group, where P is an integer greater than 1;

The third mapping unit is configured to map the data frame group to the service layer signal by means of BMP.
A computer-readable storage medium storing a computer program, wherein the computer program implements the steps of the method described in any one of claims 1 to 10 when the computer program is executed by a processor .
An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the claims 1 to 10 when executing the computer program The steps of the method of any one.