WO2023143403A1

WO2023143403A1 - Service data bearing method, bearing frame structure, and service processing device

Info

Publication number: WO2023143403A1
Application number: PCT/CN2023/073245
Authority: WO
Inventors: 刘峰; 陈捷
Original assignee: 中兴通讯股份有限公司
Priority date: 2022-01-29
Filing date: 2023-01-19
Publication date: 2023-08-03
Also published as: CN116566542A

Abstract

Disclosed in the present application are a service data bearing method, a bearing frame structure, and a service processing device. The service data bearing method comprises: obtaining service data needing to be borne (S100); when the amount of the service data changes, adjusting the number of D blocks in a bearing frame according to the amount and rate of the service data, or keeping the number of the D blocks in the bearing frame unchanged and adjusting the size of a payload region in the bearing frame (S200), the bearing frame being a specific code block stream consisting of an S block, a D block, and a T block defined by an Ethernet protocol, or a standard Ethernet frame; and mapping the service data and overhead information to the bearing frame, and sending the bearing frame to a sink device (S300).

Description

Service data carrying method, carrying frame structure and service processing equipment

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202210111685.1 and a filing date of January 29, 2022, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to the technical field of data processing, and in particular to a service data carrying method, a carrying frame structure and service processing equipment.

Background technique

The flexible Ethernet (FlexE, Flexible Ethernet) protocol standard technology defines the bandwidth of each time slot as 5Gbit/s, but the granularity of a single time slot is too large, which is not suitable for services with low transmission rates. For fine-grained customer services with low transmission rates, a 5Gbit/s FlexE time slot can be divided into 480 sub-slots, so that the bandwidth of each sub-slot is 10.1Mbit/s, thus It is more suitable for carrying fine-grained customer services with a rate of 10Mbit/s and above.

Although the granularity of sub-slots is small, for example, E1 (rate 2.048Mbit/s), T1 (rate 1.544Mbit/s), VC12 (rate 2.240Mbit/s) in the Synchronous Digital Hierarchy (SDH) standard ) and other CBR (Constant Bit Rate, fixed bit rate) services, the bearer frame usually needs to carry multiple SDH services to meet its bearer efficiency requirements; Waiting to receive enough bytes of business data before sending it, the transmission delay of the bearer frame is relatively large, which is not conducive to the effective transmission of business data.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

Embodiments of the present application provide a service data bearing method, a bearer frame structure, and a service processing device.

In the first aspect, the embodiment of the present application provides a service data bearing method, including: acquiring the service data to be carried; when the quantity of the service data changes, adjusting the D in the bearer frame according to the quantity and rate of the service data The number of blocks, or keep the number of D blocks in the bearer frame unchanged and adjust the size of the payload area in the bearer frame, the bearer frame is composed of S blocks, D blocks and T blocks defined by the Ethernet protocol specific code block stream or standard Ethernet frame; map the service data and overhead information to the bearer frame, and send it to the sink device.

In the second aspect, the embodiment of the present application provides a bearer frame structure, the bearer frame is a specific code block flow or a standard Ethernet frame composed of S blocks, D blocks and T blocks defined by the Ethernet protocol, and is characterized in that: The bearer frame is provided with a payload area, at least a part of the payload area is used to carry service data, and when the quantity of service data changes, the number of D blocks in the bearer frame depends on the number of service data Quantity and rate adjustment, or keep the number of D blocks in the bearer frame unchanged and adjust the size of the payload area in the bearer frame according to the quantity and rate of the service data.

In the third aspect, the embodiment of the present application provides a service processing device, including at least one processor and used for communicating with the A memory that is communicatively connected to at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can perform as described in A service data bearing method described in one aspect.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the description, and are used together with the examples of the application to explain the technical solution of the application, and do not constitute a limitation to the technical solution of the application.

Figure 1 is a general structure diagram of the FlexE protocol standard;

Fig. 2 is the arrangement mode of bit blocks under 64B/66B encoding technology;

Fig. 3 is the frame structure of basic unit frame;

FIG. 4 is a flowchart of a service data bearing method provided by an embodiment of the present application;

FIG. 5 is a frame structure diagram of a bearer frame provided by an embodiment of the present application;

Fig. 6 is a frame structure diagram of 8 bytes of each code block in a bearer frame provided by an embodiment of the present application;

FIG. 7 is a frame structure diagram in the case of n=1 and m=5 provided by an embodiment of the present application;

FIG. 8 is a frame structure diagram in the case of n=1 and m=10 provided by an embodiment of the present application;

FIG. 9 is a frame structure diagram in the case of n=1 and m=20 provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of bearer frame bearer transmission in the case of n=1 and m=5 provided by an embodiment of the present application;

FIG. 11 is a schematic diagram of bearer frame bearer transmission in the case of n=1 and m=10 provided by an embodiment of the present application;

FIG. 12 is a schematic diagram of bearer frame bearer transmission in the case of n=1 and m=20 provided by an embodiment of the present application;

Fig. 13 is a flow chart of determining the size of the payload area according to the number of target bytes provided by one embodiment of the present application;

Fig. 14 is a flow chart of adjusting the frame structure by the devices at both ends provided by an embodiment of the present application;

FIG. 15 is a frame structure diagram of a bearer frame provided by an embodiment of the present application;

FIG. 16 is a frame structure diagram in the case of n=0 provided by an embodiment of the present application;

Fig. 17 is a schematic structural diagram of a service processing device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

The standard technical specification of the FlexE protocol defines a customer service transmission method with a rate of n (n is a positive integer)*5Gbit/s, and the customer service at a rate above 5G can be carried efficiently through the FlexE physical interface. Figure 1 shows the general structure of the FlexE protocol. Taking the service transmission bandwidth of 400G as an example, four 100G optical modules are combined into a 400G transmission channel through the FlexE protocol, which solves the problem without increasing the cost. Transmission requirements of 400G services. For the physical layer with a rate of 100G, the Ethernet protocol defines that before sending a 100G data message, the data packet message is encoded in 64B/66B, and the 64-bit data block is expanded into a 66-bit information block, adding 2 bits Located in front of the 66-bit block, it is used as the start sign of the 66-bit block, and then sent out from the optical transmission port in the form of a 66-bit block. When receiving, the sink device The optical transmission port distinguishes the 66-bit block from the received data stream, and then recovers the original 64-bit data from the 66-bit block, and reassembles the data message.

The FlexE protocol is under the conversion layer of 64B/66B encoding, and before sending 66-bit data blocks, it sorts and plans 66-bit data blocks. The FlexE protocol provides a specific bit block arrangement, as shown in Figure 2, for 100G services, every 20 66-bit data blocks are divided into a data block group, and each group has a total of 20 data blocks, representing 20 time slots. Each time slot represents a service rate of 5Gbit/s bandwidth. When sending a 66-bit data block, a FlexE overhead block is inserted every time 1023 data block groups (1023*20 data blocks) are sent. After inserting the overhead block, continue to send the data block, and then insert the overhead block after sending the second 1023*20 data blocks, and so on, as shown in the black overhead block in Figure 2. In this way, during the process of sending data blocks, overhead blocks are periodically inserted, and the interval between two adjacent overhead blocks is 1023*20 data blocks. For the physical line rate of 100Gbit/s, it means that the FlexE protocol divides the physical port into 20 time slots, so the bandwidth corresponding to each time slot is 5Gbit/s. The number of time slots and time slot bandwidth defined by the FlexE protocol can meet the transmission needs of customer services such as routers and OTN networks, but some difficulties are encountered when applying the FlexE protocol to low-speed services.

1. Each 100G physical channel has only 20 time slots in total, and the total number of time slots is too small.

2. The bandwidth of each time slot is 5Gbit/s, and the granularity of a single time slot is too large, causing serious bandwidth waste when carrying low-speed services.

In order to meet the transmission requirements of low-speed services, it is necessary to further refine the time slot pipeline. In related technologies, it is mentioned that the 5G time slot rate carries and transmits fine-grained basic unit sequences, as shown in Figure 3. By defining the basic unit frame, dividing There are 24 sub-slots, and 20 basic unit frames form a multiframe, so there are 480 sub-slots in a multi-frame. Considering the bearer utilization, the bandwidth of each sub-slot is about 10.1Mbit/s, so basically The unit frame can carry the business of 10M rate. Firstly, 64/66 encoding is performed on the 10M customer service. After encoding, each group of 8 66-bit code blocks is carried on a sub-slot. Before carrying, compress each 66-bit code block into 65 bits (compress 2 sync header bits into 1 bit), forming 8 65-bit code blocks. 24 groups of 8 65-bit code blocks are mapped in a basic unit frame as a whole, and the basic unit frame is then mapped to the 5G time slot of the FlexE protocol and sent out, that is, the time slot of the 5G rate of the FlexE protocol is transmitted to the remote end on the destination device.

The above bearer mode can carry services at a rate of 10Mbit/s, but in application scenarios with finer service granularity (low-speed services), for example, it is necessary to carry 2.048Mbit/s E1 or 1.544Mbit/s T1 services, due to frame The structure is generally fixed, so the size of the area carrying business data in the frame is basically fixed. If the above-mentioned basic unit frame is used directly, when only a few channels of business are transmitted in the pipeline, it is still carried according to the current larger frame structure , it will lead to excessive service delay time and low transmission efficiency.

Based on this, the embodiment of the present application provides a service data bearing method, bearer frame structure and service processing equipment, aiming at the situation that the rate of the service data to be carried changes due to the change of the number of services in the CBR service with a fixed bit rate, according to the service The data rate adjusts the size of the area carrying service data in the bearer frame, thereby reducing transmission delay and improving transmission efficiency.

Referring to FIG. 4 , an embodiment of the present application provides a service data bearing method, including but not limited to the following steps S100 to S300.

In step S100, service data to be carried is acquired, and the service corresponding to the service data is a low-speed client service with a fixed rate.

Step S200, when the amount of service data changes, adjust the number of D blocks in the bearer frame according to the amount and rate of the service data, or keep the number of D blocks in the bearer frame unchanged and adjust the size of the payload area in the bearer frame, and carry A frame is a stream of specific code blocks composed of S blocks, D blocks, and T blocks defined by the Ethernet protocol or a standard Ethernet frame.

In step S300, service data and overhead information are mapped to a bearer frame, and the bearer frame is sent to the sink device through a corresponding time slot pipe.

The frame structure of the bearer frame in the related art is shown in FIG. 5 . Generally speaking, the service rate of the CBR service is smaller than the time slot rate of the time slot, so multiple services are sent in one time slot pipe. If the time slot rate is 10.1Mbit/s, the bearer frame at this time slot rate is composed of S blocks + 195 D blocks + T blocks, where the S block represents the frame header block, which is used to carry the frame of the bearer frame The header code block, the D block represents the data block, which is used to carry service data, and the T block represents the frame end flag block, which is used to carry the end code block of the bearer frame. If the above frame structure is used to carry 2.048Mbit/s E1 or 1.544Mbit/s T1 services, the payload area used to carry service data in the bearer frame is too large, which will cause a serious problem of low bearer efficiency.

It can be understood that the timeslot pipe in the above step S300 may be a fine-grained service pipe, an Ethernet dedicated line service pipe or an OTN service pipe, or other service pipes may be used to send bearer frames, and the embodiment of the present application does not limit the pipe Type, for the convenience of description, the subsequent default is to send the bearer frame based on the fine-grained service pipeline.

In the embodiment of the present application, the bearer frame considers the rate of the current service data, changes the size of the bearer frame or keeps the size of the bearer frame unchanged and changes the size of the payload area in the frame, so that the bearer efficiency of the changed bearer frame is comparable to that of the current service The data rate matches.

Specifically, the D block is between the S block and the T block. The S block, D block, and T block are 66-bit code blocks defined by the Ethernet 802.3 international standard. The D block is a data code block. Each D block It can carry 8 bytes of business data, and both the S block and the T block belong to the control block. The content of the first byte in the S block is 0x78, indicating that the control code block is an S block, and the T block indicates that it is an end block. , can also bear the client byte content (located in the last 7 bytes of this code block), so the T block in the Ethernet standard is divided into 8 types, namely T ₀ , T ₁ , T ₂ , T ₃ , T ₄ , T ₅ , T ₆ , T ₇ , T ₀ (the content of the first byte is 0x87) does not carry customer information on the code block, and T ₁ code block (the content of the first byte is 0x99) carries 1 byte customer information, T ₂ code block (the first byte content is 0x99) carries 2 bytes of customer information, and so on, T ₇ code block (the first byte content is 0xFF) carries 7 characters section of customer information.

Referring to the frame structure shown in Figure 6, taking the T block as the bearer frame of T ₇ and the bearer frame used to carry E1 business as an example, the rate of E1 is 2.048Mbit/s, and the time slot rate is 10.1Mbit/s, which can carry at most For 4 channels of E1 customer service, as long as the frame carrying efficiency reaches 4*2.048/10=81.92%, 4 channels of E1 services can be carried in the 10M pipe. The reason for the unsatisfactory bearer efficiency is that the control word part of the S block, the control word part of the T block, and the overhead information position in the bearer frame do not carry customer information, which affects the bearer efficiency of the bearer frame. When the number of D blocks in the bearer frame is n, the overhead word When the number of sections is x, the bearing efficiency of the bearer frame at this time is (7+n*8+7-x)/(2+n)/8, the larger n is, the higher the bearing efficiency of the bearer frame is, and x The larger the value is, the lower the carrying efficiency of the bearer frame is. Therefore, adjusting the size of the payload area in the bearer frame can correspondingly adjust the bearing efficiency of the bearer frame.

When n=2, x=3, the carrying efficiency of the bearer frame is 84.38%, and the bearer frame can meet the bearer efficiency requirement of simultaneously carrying 4 E1 services in the fine-grained pipeline, and the overhead information (overhead, in the subsequent In the figure, it is indicated by OH) occupying 3 bytes, and the payload area is 27 bytes, that is, the bearer frame carrying the E1 service needs to receive 27 bytes of customer service data before sending, and the 27 bytes bring 105.47μs of waiting delay. However, in actual work, there may be only 1 or 2 E1s due to the small number of E1 services. In this case, if the transmission method is still carried by 4 E1s at the same time, the service delay will be too large.

The embodiment of the present application adopts two methods to process the structure of the bearer frame. The first one is that the bearer frame maintains a fixed length, but the size of the payload area for carrying client services in the bearer frame changes. Requirements) to flexibly change the size of the payload area in the bearer frame. The second is to change the length of the bearer frame by changing the number of D blocks in the bearer frame. Since the number of D blocks is also related to the size of the payload area, it is equivalent to The payload area in the variable bearer frame is large Small.

For the first method, when only one E1 service is carried in the fine-grained pipeline, the carrying efficiency requirement of the carrying frame is 2.048/10=20.48%, then the size of the payload area of the carrying frame can be reduced, as shown in Figure 7 , the bearer frame is composed of three 66-bit code blocks (i.e. n=1, the bearer frame has only one D block), and the overhead information in the bearer frame occupies 2 bytes; the size parameter of the payload area of the bearer frame is set m=5 (that is, the size of the payload area is 5 bytes), at this time, the carrying efficiency of the bearer frame is 5/(3*8)=20.83%, which meets the bearer efficiency requirement of carrying one E1 channel. Under this frame structure, it only needs to wait for 5 bytes of business data each time, and the delay time is reduced to 19.53μs. Referring to Figure 8, when the E1 service in the fine-grained pipeline becomes 2-way, keep n=1 unchanged, adjust the parameter m=10, and the bearing efficiency of the bearer frame at this time is 10/(3*8)=41.66 %, to meet the load-carrying efficiency requirement of 2*2.048/10=40.96%, and the delay time is reduced to 39.06 μs at this time. With reference to shown in Figure 9, when the E1 business in the fine-grained pipe becomes 4 paths, then n=1 can be kept unchanged, and the parameter m=20 is adjusted (when n=1, the maximum available byte of the payload area in the bearer frame is 20 bytes), at this time, the carrying efficiency of the bearer frame is 20/(3*8)=83.33%, meeting the bearer efficiency requirement of 4*2.048/10=81.92%, and the delay time at this time is 78.125 μs.

The bearer process of the above-mentioned first mode is shown in Fig. 10 with reference to, in the case of n=1, m=5, the member identifier of the bearer frame has only one E1 identifier, and after receiving the E1 service data of 5 bytes, it is encapsulated into Send out in the bearer frame, and then receive 5 bytes of E1 service data, encapsulate it in the bearer frame and send it out, and repeat the same operation in a cycle. After receiving the bearer frame, the sink device extracts E1 service data from the payload area of the bearer frame according to the size of the payload area of the bearer frame to restore the original E1 service. Referring to Figure 11, in the scenario where the structure of the bearer frame is n=1, when the number of bearer E1 services changes from 1 to 2, adjust the size of the payload area of the bearer frame from m=5 to m=10 , the size of the payload area in the bearer frame is 10 bytes, the member identifier of the first bearer frame is the first E1 service, and the 10 bytes of the received first E1 service are encapsulated into the bearer frame and sent out; The member ID of the second bearer frame is the second E1 service, after receiving the 10-byte E1 service data of the second E1 service, it will be encapsulated and sent out; the member ID of the third bearer frame is the first E1 service service, encapsulate the 10 bytes of the received first E1 service into a bearer frame and send it out; the member identifier of the fourth bearer frame is the second E1 service, and will receive the 10 bytes of the second E1 service The E1 service data of the node is encapsulated and sent out. The first E1 service and the second E1 service are interleaved and sent in the bearer frame sequence, and the cycle is repeated in turn. After receiving the bearer frame, the sink device extracts the E1 service data from the payload area of the bearer frame according to the member ID and the size of the payload area of the bearer frame, and restores the original E1 service. Similarly, as shown in Figure 12, for the case of m=20, the service data of each 20 bytes of the first E1 service, the second E1 service, the third E1 service, and the fourth E1 service are in order respectively The bearer is sent on the 4i+1 bearer frame, the 4i+2 bearer frame, the 4i+3 bearer frame and the 4i+4 bearer frame (i is a natural number), that is, the first path, the second path, The third and fourth E1 services are sent in bearer frames alternately in turn, repeating the cycle. According to the member ID and the size of the payload area in the bearer frame, the sink device extracts the customer service byte information from the bearer frame corresponding to the member ID, and restores the original E1 service.

In order to adjust the size of the area carrying service data in the bearer frame, the overhead field corresponding to the overhead information includes a capacity indication field used to indicate the size of the payload area, so the embodiment of the present application can be adjusted by setting the value of the capacity indication field Adjust the structure of the bearer frame. Wherein, the value of the capacity indication field represents the adjusted target number of bytes; therefore, the structure of the bearer frame is adjusted by setting the value of the capacity indication field, referring to FIG. 13 , including the following steps S410 and S420.

Step S410, determine the number of bytes occupied by the payload area in the bearer frame according to the target number of bytes.

Step S420, adjusting the number of D blocks in the bearer frame according to the bytes occupied by the payload area or adjusting the size of the payload area while keeping the number of D blocks in the bearer frame unchanged.

For the first method, the value of the capacity indication field does not exceed the maximum number of bytes in the payload area of the current bearer frame. When the overcapacity indication field adjusts the frame structure, the coordination between the source end device and the sink end device is carried out by way of request and response. After coordination, both the source device and the sink device load and extract client service bytes according to the size of the payload area of the bearer frame. When the number of services carried by clients changes, the size of the payload area of the frame carried can be dynamically adjusted to adapt to the change in the number of clients. For example, in the above embodiment, only one channel of E1 service is transmitted at the beginning. In order to pursue the minimum delay time, the value of the capacity indicator field in the bearer frame is set to 5. After working for a period of time, two channels of E1 services need to be transmitted, and Adjusted the value of the capacity indication field from 5 to 10. As the number of E1 services to be transmitted is adjusted from 2 channels to 4 channels, the value of the capacity indication field in the bearer frame is adjusted from 10 to 20.

The coordination between the source device and the sink device through application and response can be realized through the value of the corresponding field in the overhead information. The overhead field corresponding to the overhead information also includes a frame change handshake indication field, and the frame change handshake indication field includes a CR bit for a frame change application, a CA bit for a frame change response, and a C bit for a frame change indication; Referring to FIG. 14, the process of adjusting the structure of the bearer frame includes steps S510 to S530.

In step S510, the source device sets the CR bit, and sends the bearer frame with the CR bit to the sink device.

Step S520, the source device receives the response signal sent by the sink device after setting the CA bit according to the CR bit.

Step S530: Set the C bit to 1 according to the response signal, and send the adjusted bearer frame with the C bit to the sink device.

The frame change handshake indication field stores frame change handshake indication information for coordinating the source device and the sink end device. The information may be a set of signals, including a frame change request indication signal (such as a CR signal, indicating a frame change request signal), a frame change request signal, and a frame change request signal. Change response indication signal (such as CA signal, indicating the frame change response signal) and frame change indication signal (such as C signal, indicating the frame structure change indication signal), used for the equipment at both ends to complete the structure of the bearer frame (the size of the bearer frame or the bearer frame The size of the payload area of the frame) changes when negotiating and manipulating work. When the source device needs to change the frame structure, first set the request signal CR to 1, after the sink device receives the frame change request signal CR, it completes the preparation work and restores the response signal CA to 1, and the source device receives the response signal The frame change indication signal C is activated, and the source device and the sink device complete the adjustment process of the bearer frame.

It can be understood that, in addition to the above capacity indication field and frame change handshake indication field, the overhead field may also include at least one of the following:

- member identification, used to distinguish individual business members in multiple businesses;

- multiframe identifier, used to distinguish each bearer frame that constitutes the multiframe;

- service type signal, used to indicate the type of service carried;

- Timestamp value information, which is used to represent the clock information of the service;

The adjustment indication information is used to indicate whether the adjustment area is used to carry service data, and the adjustment area is used to perform rate adaptation on services and bearer frames;

- Position indication, used to indicate the bearer position of special bytes for services with special bytes;

- check information, used to store check fields.

Among them, time stamp value information: when transmitting customer business data, it is used to represent the clock information of the business data. The time stamp value information is sent to the sink device through the bearer frame, and the sink device restores the original clock information according to the customer business clock information. The clock signal of the customer service, thereby recovering the customer service. When the customer service (such as E1/T1 service) is mapped to the bearer frame, record the time information value corresponding to the customer service. The time information value can be used as the time stamp value information of these customer services. The time stamp value information can be an absolute time value. Can also be a relative time value.

Position indication: For services such as VC12, VC3, and VC4, some bytes of this type of service are special bytes (such as J1 bytes), and the carrying position of the special bytes in the bearer frame needs to be given.

Check information: including error check and overhead check, the error check is used to check the check value of the customer information carried in this frame or the previous frame (or a previous frame), and is used to check the customer information Whether there is a bit error in the content, the BIP check algorithm can be used for implementation, such as BIP2, BIP8 and other parity check algorithms. The overhead check is used to check whether there is a bit error in the overhead field during transmission. Various cyclic redundancy check algorithms can be used, such as CRC4, CRC5, CRC8, etc.

Adjust the instruction information: Since the rate of the client service does not match the rate of the bearer frame, there is a slight frequency offset between the two, and the instruction information needs to be adjusted to achieve rate adaptation between the two. When the adjustment indication function is enabled, an adjustment area will be set in the payload area, and the adjustment indication information is used to indicate whether the adjustment area carries the customer's business data, so as to adapt to the rate difference between the customer's business and the bearer frame.

In the case of starting the adjustment indication information, part of the payload area is set as the adjustment area, as shown in Figure 15, the position of the first byte of the payload area is set as the adjustment area (indicated by a vertical grid in the figure), The adjustment area may or may not carry customer services, and the adjustment indication information determines whether the adjustment area carries customer service data. When the adjustment area carries customer service data, it means that the payload area of the frame becomes larger, which is equivalent to an increase in the speed of the bearer pipeline, and can carry customer services with a relatively high speed; when the adjustment area does not carry customer services, it is quite Because the payload area of the bearer frame becomes smaller, it is equivalent to a decrease in the speed of the bearer pipeline, which can bear customer services with relatively low speed. In a specific application, the adjustment area may be located at the beginning of the payload area, or at other positions in the payload area, such as the last position. When the size of the payload area in the bearer frame is not a fixed value, but dynamic and random changes, the above-mentioned m value can serve as an adjustment indication function, that is, the m value directly represents the actual number of bytes carried by the client in the payload area.

For the second method, the size of the bearer frame changes, and the bearer frame is composed of S blocks + n D blocks + T blocks, and n is a floating value (equivalent to replacing the floating m value in the first method by floating the n value) , where n=0, 1, 2, 3, 4..., the T block type can also be one of the above 8 types, then through the floating n value and the floating T block type, the net of the bearer frame can be flexibly adjusted Load area size.

For example, when carrying one channel of E1 service, the structure of the bearer frame is as shown in Figure 16, where n=0, the structure of the bearer frame becomes S+T blocks. The payload area can be located in the S block and the T block, and there are at most 14 bytes in the S block and the T block that can be used as bearer overhead bytes and as the payload area. At this time, as long as the size of the payload area in the bearer frame is not less than 4 bytes, the bearing efficiency of the bearer frame is not less than 25%, which can meet the requirement of carrying one E1 in a 10M fine-grained pipeline (one E1 service The bandwidth is only 2.048Mbit/s). When carrying 2 channels of E1 services, n=1 can be set, and the frame structure of the bearer is S block + D block + T block. As long as the size of the payload area is not less than 10 bytes, it can meet the requirements of carrying 2 channels in a 10M fine-grained pipeline. The demand for E1 channels (the service bandwidth of 2 E1 channels is only 4.096Mbit/s). When carrying 4 channels of E1 services, you can set n=2, and the bearer frame structure is S block + 2 D blocks + T blocks. As long as the size of the payload area reaches a certain value, it can meet the requirements of carrying 4 channels of E1 in the 10M small granular bandwidth. Requirements are not described here.

In short, due to the increase in the number of D blocks in the bearer frame, the payload area becomes larger, the bearer efficiency is improved, and various required bearer efficiencies can be achieved. It can be understood that when the bearer frame is composed of S blocks + n D blocks + T blocks (n is a floating value mode), the frame structure is not only flexible to transmit E1 services with different numbers of channels, but also suitable for other services with different rates , such as the STM-1 service defined in the SDH system standard, the STM-1 service speed is 155.51Mbit/s, and can be transmitted in 16 fine-grained pipes, and the speed of the 16 fine-grained pipes is 160Mbit/s. block + n D blocks + T blocks to form a bearer frame, when n is not less than 25, and the capacity of the payload area is not less than 210, the bearer frame’s bearer efficiency is not less than 97.22%, and the 16 fine-grained pipes carry The carrying efficiency of the frame is 160*97.22%=155.56%, which can carry the bandwidth requirement of one STM-1 frame.

In practical applications, the number of customer services carried can be dynamically and non-destructively adjusted without affecting the customer services being carried. For example, at the beginning, the fine-grained service pipeline only carries the first E1 service. Affected by The first E1 business to come. When the third E1 and the fourth E1 are added, the original first and second E1 services will not be affected. Similarly, when the number of E1 services is reduced, the E1 services being carried will not be affected. When the source device and the sink device in the network increase or decrease the number of customer services, they can complete the negotiation on the bearer frame structure between the two devices through the network management information, or through the overhead information of the bearer frame (the Handshake negotiation information, such as frame change application signal, frame change response signal) for negotiation, after the negotiation between the source device and the sink device is completed, the change of the bearer frame structure is completed through the frame change indication signal of the bearer frame. After the source device sends out the frame change instruction signal, the source device and the sink device start to change the structure of the bearer frame in the next frame, and also change the number of clients delivering E1 services. The source device and the sink device may also agree to change the bearer frame structure at the first frame in the next multiframe or some other frame.

The above cases are several implementations of the present application, taking the bearing of E1 business as an example, specifically in the application, it can also bear the weight of T1 business (SDH defines T1 business rate as 1.544Mbit/s), VC12, V3, V4, STM-1 , STM-4 and other fixed-rate CBR services.

The embodiment of the present application also provides a business processing device, including at least one processor and a memory for communicating with the at least one processor; the memory stores instructions that can be executed by at least one processor, and the instructions are processed by at least one executed by a processor, so that at least one processor can execute the foregoing service data bearing method.

Referring to FIG. 17 , it is taken as an example that the control processor 1001 and the memory 1002 in the service processing device 1000 can be connected through a bus. The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk memory, a flash memory device, or other non-transitory solid-state storage devices. In some implementations, the storage 1002 may optionally include storages that are set remotely relative to the control processor 1001, and these remote storages may be connected to the service processing device 1000 through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Those skilled in the art can understand that the device structure shown in FIG. 17 does not constitute a limitation on the service processing device 1000, and may include more or less components than shown in the illustration, or combine some components, or arrange different components .

The embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by one or more control processors, for example, by the Executed by a control processor 1001, the above-mentioned one or more control processors can execute the service data bearing method in the above-mentioned method embodiment, for example, execute the method steps S100 to S300 in FIG. 4 described above, and the method in FIG. 13 The method step S410 to step S420, and the method step S510 to step S530 in FIG. 14 .

The service data bearing method provided by the embodiment of the present application has at least the following beneficial effects: for the problem of large time delay caused by low-speed customer service in order to meet the requirements of the transmission efficiency of the bearer frame, the bearer frame in the embodiment of the application is used for bearer The size of the payload area of the service data can be adjusted according to the actual service rate and the number of services. For a certain service with a fixed rate, when the number of services is small, a smaller space is used to carry the service data; Use a larger space to carry service data, improve the carrying efficiency of the bearer frame under different business quantities, reduce the transmission delay, and avoid the situation that the bearer frame has to wait for enough business data to be sent when there are only a few services question.

The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Those skilled in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware and an appropriate combination thereof. Some physical components or all physical components may be implemented as handled by software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or implemented as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile media implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules, or other data. permanent, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, tape, magnetic disk storage or other magnetic storage devices, or can Any other medium used to store desired information and which can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The above is a specific description of several implementations of the present application, but the present application is not limited to the above-mentioned embodiments. Those skilled in the art can also make various equivalent deformations or replacements without departing from the scope of the present application. Any modification or substitution is included within the scope defined by the claims of the present application.

Claims

A service data bearing method, comprising:

Obtain the business data that needs to be carried;

When the quantity of the service data changes, adjust the number of D blocks in the bearer frame according to the quantity and rate of the service data, or keep the number of D blocks in the bearer frame unchanged and adjust the payload in the bearer frame The size of the area, the bearer frame is a specific code block stream or a standard Ethernet frame composed of S block, D block and T block defined by the Ethernet protocol;

Map the service data and overhead information to the bearer frame and send it to the sink device.
The method for carrying service data according to claim 1, wherein the overhead information includes adjustment indication information for indicating whether an adjustment area is used to carry service data, and the adjustment area is used for matching the service and the bearer frame Perform rate adaptation; the service data bearing method also includes:

enabling the adjustment indication information to set a part of the payload area as the adjustment area;

When the rate of the service data is too high, the adjustment area carries customer service data, and increases the amount of service data carried in the bearer frame;

When the rate of the service data is relatively small, the adjustment area does not carry customer service data, and the quantity of service data carried in the bearer frame is reduced; or the adjustment indication information is not enabled.
The service data bearing method according to claim 1, wherein the overhead field corresponding to the overhead information includes a capacity indication field for indicating the size of the payload area, and the method further includes:

Adjusting the structure of the bearer frame by setting the value of the capacity indication field to determine the bearer quantity of service data.
The service data bearing method according to claim 3, wherein the value of the capacity indication field is expressed as an adjusted target number of bytes;

The adjusting the structure of the bearer frame by setting the value of the capacity indication field includes:

determining the number of bytes occupied by the payload area in the bearer frame according to the target number of bytes;

Adjusting the number of D blocks in the bearer frame according to the number of bytes occupied by the payload area or adjusting the size of the payload area while keeping the number of D blocks in the bearer frame unchanged.
The service data bearing method according to claim 1, wherein the overhead field corresponding to the overhead information further includes a frame change handshake indication field, and the frame change handshake indication field includes CR bits for frame change application, for The CA bit of the frame change response and the C bit for the frame change indication; the process of adjusting the structure of the bearer frame includes:

Set the CR bit position, and send the bearer frame with the CR bit position to the sink device;

receiving the response signal sent by the sink device after setting the CA bit according to the CR bit;

Set the C bit to 1 according to the response signal, and send the adjusted bearer frame with the C bit to the sink device.
The service data bearing method according to any one of claims 1 to 5, wherein the overhead information further includes at least one of the following:

a member ID used to distinguish individual business members among multiple businesses; or

A multiframe identifier, used to distinguish each bearer frame constituting the multiframe; or

A service type signal, used to indicate the type of service carried; or

Timestamp value information, used to represent the clock information of the service; or

Adjustment indication information, used to indicate whether the adjustment area is used to carry service data, the adjustment area is used for performing rate adaptation on the service and the bearer frame; or

A location indication, for a service with a special byte, indicating the bearer location of the special byte; or

Error checking information, used to check the service data in the current bearer frame or a previous bearer frame; or

The overhead verification information is used to verify whether a bit error occurs during the transmission of the overhead information.
The service data bearing method according to claim 1, wherein the transmitted bearer frame is sent through a fine-grained service pipeline, an Ethernet dedicated line service pipeline or an OTN service pipeline.
A bearer frame structure, the bearer frame is a specific code block flow or a standard Ethernet frame composed of S block, D block and T block defined by the Ethernet protocol, wherein: the bearer frame is provided with a payload area, the At least a part of the payload area is used to carry service data, and when the quantity of service data changes, the number of D blocks in the bearer frame is adjusted according to the quantity and rate of the service data, or the bearer frame is kept The number of D blocks in the frame remains unchanged, and the size of the payload area in the bearer frame is adjusted according to the quantity and rate of the service data.
The bearer frame structure according to claim 8, further comprising an overhead field for storing overhead information, the overhead field includes a capacity indication field for indicating the size of the payload area, and the capacity indication field is used for determining the The size of the payload area in the bearer frame.
The bearer frame structure according to claim 9, wherein the overhead field further includes a frame change handshake indication field, and the frame change handshake indication field includes CR bits for frame change application and frame change response The CA bit and the C bit for frame change indication.
A service processing device, comprising at least one processor and a memory for communicating with the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor The at least one processor is executed, so that the at least one processor can execute the service data bearing method according to any one of claims 1-7.