WO2022261931A1

WO2022261931A1 - Method and apparatus for transmitting data

Info

Publication number: WO2022261931A1
Application number: PCT/CN2021/100879
Authority: WO
Inventors: 侯培杰; 陈玉杰
Original assignee: 华为技术有限公司
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2022-12-22
Also published as: CN117378214A

Abstract

The present application provides a method and apparatus for transmitting data. The method comprises: a first device obtains an optical service unit (OSU) cell; the first device maps the OSU cell to an STM-1 frame; the first device sends the STM-1 frame to a second device; the second device receives the STM-1 frame from the first device, the STM-1 frame comprising the OSU cell; and the second device demaps the STM-1 frame to obtain the OSU cell. According to the solution of the present application, when an SDH/MSTP network is between the first device and the second device, the first device maps the OSU cell to the STM-1 frame and sends same, and the second device receives the STM-1 frame and demaps the OSU cell from the STM-1 frame, thereby implementing end-to-end transmission once data is mapped to the OSU cell.

Description

Method and device for transmitting data

technical field

The present application relates to the field of optical communication, in particular to a method and device for transmitting data.

Background technique

In the field of optical communication, mapping data to an optical service unit (OSU) for transmission has the advantages of small particles, flexible bandwidth, low delay, and high reliability. However, currently the OSU can only be transmitted through an optical transport network (OTN). In the current optical communication network, the synchronous digital hierarchy (SDH) network and the multi-service transport platform (multi-service transport platform, MSTP) network still have relatively large scale. Therefore, in order to promote OSU business, how to transmit OSU through SDH/MSTP network is an urgent problem to be solved.

Contents of the invention

The present application provides a method and device for transmitting data.

In a first aspect, a data transmission method is provided, including: a first device acquires an OSU cell. The first device maps the OSU cell into a first-level synchronous transport module STM-1 frame. The first device sends an STM-1 frame to the second device.

According to the solution of the present application, after the OSU cell is mapped into the STM-1 frame, the STM-1 frame can be transmitted through the SDH/MSTP network, thereby realizing the transmission of the OSU cell through the SDH/MSTP network.

With reference to the first aspect, in some implementation manners of the first aspect, the first device maps the OSU cell to the first-level synchronous transport module STM-1 frame, including: the first device determines the M in the STM-1 frame The size of each first padding field in the M first padding fields is greater than or equal to the size of one OSU cell, and M is a positive integer. When the OSU cell is scheduled, the first device fills the OSU cell into the first padding field. When no OSU cells are scheduled, the first device fills idle cells into the first padding field.

According to the solution of the present application, M first padding fields can be divided in the payload area of the STM-1 frame in advance, and OSU cells are filled into the first padding fields, thereby providing a method for mapping OSU cells to STM-1 One possible way to frame.

With reference to the first aspect, in some implementation manners of the first aspect, the first device maps the OSU cell to the first-level synchronous transport module STM-1 frame, and further includes: the first device determines in the STM-1 frame There are M second padding fields, and the M second padding fields are in one-to-one correspondence with the M first padding fields. The first device fills the first overhead information and the second overhead information in the i-th second padding field according to the filling condition of the i-th first padding field, and the i-th first padding field and the i-th second padding field correspond. Wherein, the first overhead information indicates whether OSU cells are filled in the i-th first padding field, and when the i-th first padding field is filled with OSU cells, the second overhead information indicates that the i-th first padding field The OSU cell filled in corresponds to the bandwidth of the service, and i is a positive integer less than or equal to M.

According to the solution of the present application, by setting the second padding field, it is more convenient to determine whether the first padding field is filled with OSU cells, thereby improving the efficiency of demapping the STM-1 frame.

With reference to the first aspect, in some implementation manners of the first aspect, the first device maps the OSU cell to the first-level synchronous transport module STM-1 frame, including: the first device determines in the STM-1 frame Three fill fields. When dispatching the OSU cell, the first device fills the start delimiter, the OSU cell and the end delimiter into the third padding field, the start delimiter is before the OSU cell, and the end delimiter is before the OSU cell After the OSU cell. When no OSU cells are scheduled, the first device fills idle cells into the third filling field.

According to the scheme of the present application, an OSU cell can be determined by the start delimiter character and the end delimiter character, and at this moment, it is not necessary to divide the payload area of the STM-1 frame into M first padding domains, therefore, through this This way can more flexibly map OSU cells into STM-1 frames.

With reference to the first aspect, in some implementation manners of the first aspect, the first device fills the start delimiter, the OSU cell, and the end delimiter into the third padding field, including: the first device fills the start The delimiter character, the OSU cell and the end delimiter character are encapsulated, and the encapsulated OSU cell is filled into the third padding field. Alternatively, the first device sequentially fills the start delimiter character, the OSU cell and the end delimiter character in the third padding field.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the first device receives first indication information from the third device, and the first indication information indicates that OSU cells are mapped into STM-1 frames mode.

According to the solution of the present application, the third device (for example, the network management device) sends instruction information to the first device, so that the first device can specify the processing method for the OSU cells.

With reference to the first aspect, in some implementation manners of the first aspect, the first device maps the OSU cell to the first-level synchronous transport module STM-1 frame, and further includes: the first device determines in the STM-1 frame Fourth padding field. The first device fills the second indication information in the fourth padding field, and the second indication information indicates the mode of demapping the STM-1 frame, wherein the mode of demapping the STM-1 frame is the same as mapping the OSU cell to the STM-1 Pattern correspondence in 1 frame.

According to the solution of the present application, by setting the fourth padding field, the receiving end can correctly demap the STM-1 frame, and avoid errors during demapping at the receiving end.

In a second aspect, a data transmission method is provided, including: a second device receives a first-level synchronous transport module STM-1 frame from a first device, and the STM-1 frame includes an OSU cell. The second device demaps the first STM-1 frame to obtain the OSU cell.

According to the solution of this application, when the SDH/MSTP network is between the first device and the second device, the first device maps the OSU cell into an STM-1 frame and sends it, and the second device receives the STM-1 frame and sends it from The OSU cells are demapped in the STM-1 frame, so that the end-to-end transmission of data after being mapped to the OSU cells is realized.

With reference to the second aspect, in some implementation manners of the second aspect, the demapping of the STM-1 frame by the second device includes:

The second device retrieves M second padding fields in the STM-1 frame, where the M second padding fields are in one-to-one correspondence with the M first padding fields, and M is a positive integer. Wherein, the i-th second padding field includes first overhead information, and the first overhead information indicates whether OSU cells are filled in the i-th first padding field, and the i-th first padding field and the i-th second padding field Domain corresponds, i is a positive integer less than or equal to M. When the first overhead information indicates that the i-th first padding field is filled with OSU cells, the second device acquires the OSU cells from the i-th first padding field. When the first overhead information indicates that the i-th first padding field is not filled with OSU cells, the second device continues to search for other second padding fields.

With reference to the second aspect, in some implementation manners of the second aspect, the i-th second padding field further includes second overhead information. The second device demaps the STM-1 frame, further comprising:

When the first overhead information indicates that OSU cells are filled in the ith first padding field, the second device obtains the second overhead information, and the second overhead information indicates the service corresponding to the OSU cell filled in the ith first padding field bandwidth.

With reference to the second aspect, in some implementation manners of the second aspect, the demapping of the STM-1 frame by the second device includes: the second device retrieves a third padding field in the STM-1 frame, and the third padding field includes The beginning and end delimiting characters. The second device obtains the OSU cell according to the start delimiter character and the end delimiter character.

With reference to the second aspect, in some implementation manners of the second aspect, the third padding field further includes second overhead information, and the second overhead information indicates the bandwidth of the service corresponding to the OSU cell. Demapping the STM-1 frame by the second device further includes: the second device acquires second overhead information from between the start delimiter character and the end delimiter character.

With reference to the second aspect, in some implementation manners of the second aspect, the demapping of the STM-1 frame by the second device further includes: the second device acquires the second indication information from the fourth padding field of the STM-1 frame, The second indication information indicates the mode of demapping the STM-1 frame.

Alternatively, the method also includes:

The second device receives third indication information from the third device, where the third indication information indicates a mode for demapping the STM-1 frame.

According to the solution of the present application, in a possible implementation manner, the STM-1 frame may carry the second indication information. In another possible implementation manner, the second device may receive third indication information from the third device. Through these two methods, the second device can correctly demap the STM-1 frame.

In a third aspect, a communication device is provided, and the communication device includes a unit for performing the method in the first aspect or various implementations thereof. Alternatively, the communications device includes a unit for performing the method in the second aspect or various implementations thereof.

In a fourth aspect, a communication device is provided, including at least one processor. The memory is used to store computer programs. When the communication device is running, the processor executes the computer programs or instructions stored in the memory, so that the communication device executes the method in the first aspect or its various implementations. Or, make the communication device execute the method in the second aspect or its various implementation manners.

In a fifth aspect, a computer-readable storage medium is provided, including a computer program. When the computer program is run on a computer, the computer is made to execute the method in the first aspect or various implementations thereof. Or, make the computer execute the method in the second aspect or various implementations thereof.

According to a sixth aspect, a chip is provided, and a processing circuit is disposed on the chip, and the processing circuit is used to execute the method in the first aspect or various implementation manners thereof. Alternatively, the processing circuit is configured to execute the method in the second aspect or various implementations thereof.

In a seventh aspect, a computer program product is provided, and the computer program product includes: a computer program (also referred to as code, or an instruction), which, when the computer program is run, causes the computer to execute the program described in the first aspect or its various implementations. Methods. Or, make the computer execute the method in the second aspect or various implementations thereof.

Description of drawings

FIG. 1 shows a schematic diagram of a network architecture applicable to this embodiment of the present application.

Figure 2 shows a method for mapping OSUs into STM-1 frames.

Fig. 3 shows a frame structure of an STM-1 frame.

Fig. 4 shows a method for demapping STM-1 frames.

Fig. 5 shows another method for mapping OSUs into STM-1 frames.

Fig. 6 shows another frame structure of the STM-1 frame.

FIG. 7 shows the way of encapsulating OSU cells.

Fig. 8 shows a method for demapping STM-1 frames.

Fig. 9 shows a scenario applicable to the method proposed in this application.

FIG. 10 shows the process of sending data in the scenario of FIG. 9 .

Fig. 11 shows another scenario applicable to the method proposed in this application.

FIG. 12 shows the process of sending data in the scenario of FIG. 10 .

Fig. 13 shows a schematic block diagram of a communication device provided in this application.

Fig. 14 shows a schematic block diagram of a communication device provided by the present application.

detailed description

The technical solution in this application will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of a network architecture applicable to this embodiment of the present application. As shown in Figure 1, it includes OTN network and SDH/MSTP network. Each network includes a certain number of devices (indicated by N in the figure).

As shown in Figure 2, the present application proposes a method for mapping OSU cells to a first-level synchronous transport module (synchronous transport module level 1, STM-1) frame, which can also be referred to as the first mode .

The method includes:

S201. Determine M first padding fields and M second padding fields in the payload area of the STM-1 frame.

As shown in FIG. 3 , there is a one-to-one correspondence between the M first padding fields and the M second padding fields. Each of the M first padding fields is used to carry an idle unit or an OSU cell, and each of the M second padding fields is used to carry the corresponding first padding field overhead information. It should be understood that the size of each first padding field should be greater than or equal to the size of one OSU cell, so that one OSU cell can be filled into the first padding field as a whole.

According to the scheme of the present application, M first padding fields can be divided in the payload area of the STM-1 frame in advance, and OSU cells are filled into the first padding fields, thus providing a method for mapping OSU cells to STM-1 One possible way for 1 frame.

In a possible implementation manner, a fourth padding field may also be determined in the STM-1 payload area, the fourth padding field is used to fill in the second indication information, and the second indication information indicates demapping the STM-1 frame mode. At this time, the mode of demapping the STM-1 frame indicated by the second indication information corresponds to the mode of mapping the OSU into the STM-1 frame in FIG. 2 . The mode of STM-1 frame demapping corresponding to the mapping mode in FIG. 2 will be introduced in detail later.

The overhead information in each second padding field includes first overhead information and second overhead information, the first overhead information indicates whether the corresponding first padding field is filled with OSU cells, and in the corresponding first padding field In the case of filling with OSU cells, the second overhead information indicates the bandwidth of the service corresponding to the filled OSU cells in the corresponding first padding field, and if the corresponding first padding field is not filled with OSU cells , the second overhead information may be preset characters. In a possible implementation manner, the bandwidth of the service corresponding to the OSU cell is used by the downstream receiving end to perform bandwidth verification, exception interception, and the like. By setting the second padding field, it is more convenient to determine whether the first padding field is filled with OSU cells, thereby improving the efficiency of demapping the STM-1 frame.

The bandwidth of a service corresponding to an OSU cell takes k as a basic unit, for example, the value of k may be 2.6 Mb/s, that is, the bandwidth of a service corresponding to an OSU cell is S times k. In the case that the corresponding first filling field is filled with OSU cells, the second overhead information may indicate a specific value of S, thereby indicating the bandwidth information of the service corresponding to the OSU cells.

In a possible implementation manner, the M first padding fields have the same size. The size of the M second padding fields is the same. For example, in the M first padding fields, the size of each first padding field may be 192 bits; in the M second padding fields, the size of each second padding field may be 10 bits, where the first overhead information may occupy 2 bits, and the second overhead information may occupy 8 bits.

S202. Store the OSU cell into the data cache.

The following describes how to store OSU cells into the data cache.

Method 1:

When multiple OSU cells belong to one data flow, store multiple OSU cells into a data buffer. That is, when multiple OSU cells are data of the same service, they can be transmitted through one data flow.

Method 2:

When multiple OSU cells belong to P data streams, the P data streams correspond to P data caches, and each OSU cell is cached in its corresponding data cache, where P is a positive integer greater than or equal to 2. That is, when multiple OSU cells are data of P services, they can be transmitted through P data streams.

S203. Initiate cell scheduling to the data queue, and perform bandwidth supervision on data cache egress.

It should be understood that when the OSU cell is cached in the data cache, the identifier of the OSU cell may be stored in a data queue corresponding to the data cache. When sending an OSU cell, first initiate cell scheduling to the data queue, obtain the identifier of the OSU cell, and then read the OSU cell from the data buffer according to the identifier of the OSU cell.

When S202 is performed according to mode 2, since there are P data streams in total, the P data queues corresponding to the P data buffers can be scheduled according to the round robin (RR) scheduling mode.

In addition, according to the bandwidth information of the data stream, bandwidth supervision is performed on the data cache outlet, and the data transmission rate of the data stream is controlled, so that the data transmission rate of the data stream is within the corresponding bandwidth range, and at the same time, bursts of the data stream are avoided.

It should be understood that "burst" in this application means sending data unevenly. For example, the bandwidth information of the data stream is 2Mb/s, and there is 8Mb of data to be sent. One sending method is to send 2Mb per second, and the sending of 8Mb data is completed in 4 seconds; All 8Mb data will be sent in seconds, and no data will be sent in the next 3 seconds. It can be seen that the average transmission rate of data within 4 seconds in the two methods meets the bandwidth requirement, but the data transmission of the second method is uneven compared with the first method.

S204. Fill M first filling fields.

When dispatching OSU cells from the data queue, fill the dispatched OSU cells into the first filling field.

In a possible implementation, when the size of the first padding field is larger than the size of the OSU cell, that is, the scheduled OSU cell does not fill up a first padding field, at this time, the first padding field can be The idle units are continuously filled in the padding field until the first padding field is full.

When no OSU cell is dispatched from the data queue, idle cells are filled into the first padding field.

In a possible implementation manner, the M first padding fields may be filled in order from top to bottom and from left to right. In another possible implementation manner, for one or more data streams in the P data streams, one or more first padding fields among the M first padding fields may be specified, and the one or more first padding fields The padding field is a dedicated padding field for the one or more data streams.

S205. Fill the first overhead information and the second overhead information in the second padding field corresponding to each first padding field according to the filling condition of each first padding field in the M first padding fields.

For example, OSU cell #1 is filled in the first padding field #1, and the bandwidth information of the service corresponding to OSU cell #1 is 10 times 2.6Mb/s, then the second padding field corresponding to the first padding field #1 can The padding field #1 is filled with the first overhead information indicating that the first padding field #1 is filled with the OSU cell #1, and the padding of the second overhead information indicates "S is 10". For example, if the first overhead information occupies 2 bits, "11" may be used for indication; if the second overhead information occupies 8 bits, "00001010" may be used for indication.

For another example, if the first padding field #2 is not filled with OSU information, then the first overhead information is filled in the second padding field #2 corresponding to the first padding field #2 to indicate that no OSU information is filled in the first padding field #2. element, filling preset characters in bits corresponding to the second overhead information. If the first overhead information occupies 2 bits, "00" may be used for indication; if the second overhead information occupies 8 bits, a possible implementation manner of the preset character may be "11111111".

In a possible implementation manner, the method further includes: S206, filling the second indication information in the fourth filling field. The second indication information indicates the mode of demapping the STM-1 frame.

S207, adding the section overhead and the management unit pointer to form the STM-1 frame.

Wherein, the section overhead may include regeneration section overhead and multiplexing section overhead. In a possible implementation, segment overhead can be added to rows 1-3 and columns 1-9 of the STM-1 frame, and multiplex segment overhead can be added to rows 5-9 and columns 1-9 of the STM-1 frame. Columns 1-9, add the snap-in pointer to row 4 and columns 1-9 of the STM-1 frame. The specific process can refer to the existing SDH protocol.

As shown in FIG. 4 , the present application proposes a method for demapping OSU cells from STM-1 frames, and this method can also be called the second mode. This method corresponds to the method for mapping OSU cells into STM-1 frames shown in FIG. 2 . The method includes:

S401. Strip the segment overhead and the management unit pointer in the STM-1 frame.

In a possible implementation manner, the method further includes: S402. Retrieve a fourth padding field, and determine a demapping mode for the STM-1 frame according to the second indication information.

S403. Retrieve M second padding fields, and obtain an OSU cell from M first padding fields.

The process includes:

Retrieve the ith second padding field. It should be understood that the i-th second padding field corresponds to the i-th first padding field.

When the first overhead information in the i-th second padding field indicates that the i-th first padding field is filled with OSU cells, obtain the OSU cell from the i-th first padding field, and The second overhead information in the second padding field obtains the bandwidth information corresponding to the i-th OSU cell filled in the first padding field.

When the first overhead information in the i-th second padding field indicates that OSU cells are not filled in the i-th first padding field, continue to search for other second padding fields in the M second padding fields until M The second padding fields are all retrieved.

As shown in FIG. 5 , the present application proposes another method for mapping OSU cells into STM-1 frames of the first-level synchronous transport module, and this method can also be called the third mode.

The method includes:

S501. Determine a third padding field in the payload area of the STM-1.

As shown in FIG. 6, the third padding field is used to carry OSU cells or idle cells.

In a possible implementation, it is also necessary to determine a fourth padding field in the STM-1 payload area, the fourth padding field is used to fill in the second indication information, and the second indication information indicates demapping the STM-1 frame mode. At this time, the mode of demapping the STM-1 frame indicated by the second indication information corresponds to the mode of mapping the OSU into the STM-1 frame in FIG. 5 . The mode of STM-1 frame demapping corresponding to the mapping mode in FIG. 5 will be introduced in detail later.

S502. Store the OSU cell into the data cache.

This process may be the same as S202, for details, please refer to the description of S202.

S503. Initiate cell scheduling to the data queue, and perform bandwidth supervision on data cache egress.

This process may be the same as S203, for details, please refer to the description of S203.

S504. Fill the third filling field.

Here's how to populate the third padding field:

Method A:

When the OSU cells are dispatched from the data queue, the dispatched OSU cells are encapsulated. Hereinafter, the encapsulated OSU cells are referred to as E-OSU cells. Fill the E-OSU cells into the third padding field.

When no OSU cells are dispatched from the data queue, the idle cells are filled into the third padding field.

In a possible implementation manner, the third padding fields may be filled in order from top to bottom and from left to right.

The following describes how to encapsulate OSU cells:

Method 1:

As shown in (a) in FIG. 7, a start delimiter character is added before the OSU cell, and an end delimiter character is added after the OSU cell. Therefore, an OSU cell can be determined by the start delimiter character and the end delimiter character.

Method 2:

As shown in (b) in Figure 7, a start delimiter character is added before the OSU cell, an end delimiter character is added after the OSU cell, and a second delimiter character is added between the start delimiter character and the end delimiter character. overhead information. For example, the second overhead information may be after the OSU cell and before the end delimiter character. The second overhead information indicates the bandwidth of the service corresponding to the OSU cell.

Method 3:

As shown in (c) in Figure 7, add a start delimiter character before the OSU cell, add an end delimiter character after the OSU cell, and add a forward direction between the start delimiter character and the end delimiter character Error correction (forward error correction, FEC) characters. For example, the FEC character may follow the OSU cell and precede the End Delimiter character. During data transmission, if the bit error rate is high, FEC characters can be added to improve transmission reliability.

Method 4:

As shown in (d) in Figure 7, a start delimiter character is added before the OSU cell, an end delimiter character is added after the OSU cell, and a second delimiter character is added between the start delimiter character and the end delimiter character. Overhead information and FEC characters. For example, the second overhead information may be after the OSU cell and before the end delimiter character, and the FEC character may be after the second overhead information and before the end delimiter character.

Compared with the method in Fig. 2, since the method in Fig. 5 does not pre-configure a plurality of determined first padding fields in the payload area, the method in Fig. 5 can fill the payload of the STM-1 frame more flexibly Area.

Method B:

When the OSU cell is dispatched from the data queue, the start delimiter, the OSU cell and the end delimiter are filled in sequence in the third padding field. That is, OSU cells are not encapsulated, but filled in a certain order. When no OSU cells are dispatched from the data queue, the idle cells are filled into the third padding field. The size of the free unit is determined according to the actual situation.

In a possible implementation manner, the second overhead information may also be filled. For details, refer to the description in the above method 2.

In another possible implementation manner, FEC characters may also be filled. For details, refer to the description in Method 3 above.

In another possible implementation manner, the second overhead information and FEC characters may also be filled. For details, refer to the description in the above-mentioned mode 4.

According to the scheme in S504, an OSU cell is determined by the start delimiter character and the end delimiter character, and the size of the idle unit is determined according to the actual situation. At this time, it is not necessary to divide the payload area of the STM-1 frame into M The first padding field, so in this way OSU cells can be mapped more flexibly into STM-1 frames.

In a possible implementation manner, the method further includes: S505, filling the second indication information in the fourth filling field. The second indication information indicates the mode of demapping the STM-1 frame.

S506, adding the section overhead and the management unit pointer to form the STM-1 frame.

This process may be the same as that of S207, and for details, reference may be made to the description of S207.

As shown in FIG. 8 , this application proposes another method for demapping OSU cells from STM-1 frames, and this method can also be called the fourth mode. This method corresponds to the method for mapping OSU cells into STM-1 frames shown in FIG. 5 . The method includes:

S801. Strip the section overhead and the management unit pointer in the STM-1 frame.

In a possible implementation manner, the method further includes: S802. Retrieve the fourth padding field, and determine a demapping mode for the STM-1 frame according to the second indication information.

S803. Retrieve the third padding field in the STM-1 frame, and obtain the OSU cell according to the start delimiter character and the end delimiter character.

The following describes how to obtain OSU cells based on the start delimiter character and the end delimiter character:

Method C:

Corresponding to mode A in S504, the E-OSU cell is obtained according to the start delimiter character and the end delimiter character, and the start delimiter character and the end delimiter character in the E-OSU cell are stripped to obtain the OSU cell.

In a possible manner, when the manner A of S504 is performed according to the manner 2, the method further includes stripping the second overhead information in the E-OSU information element.

In a possible manner, when the manner A of S504 is performed according to the manner 3, the process further includes stripping the FEC character in the E-OSU cell.

In a possible manner, when manner A of S504 is performed according to manner 4, the process further includes stripping the second overhead information and the FEC character in the E-OSU cell.

Method D:

Corresponding to mode B in S504, the OSU cell is obtained between the start delimiter character and the end delimiter character. At this time, there is no need to obtain the E-OSU information element, and after the initial delimiter character and the end delimiter character are retrieved, the OSU information element is directly determined between the initial delimiter character and the end delimiter character.

FIG. 9 is a scenario applicable to the method proposed in this application. The device #A and the device #B are connected through the OTN network, and the device #B and the device #C are connected through the SDH/MSTP network. The device #D is the upper layer device of device #A, device #B, and device #C. For example, device #D can be a network management device, and device #D is used to control device #A, device #B, and device #C.

Assuming that device #A wants to send data to device #C, the method shown in Figure 10 can be used to send data, the method includes:

S1001. Device #D (an example of a third device) sends first indication information to a device #B (an example of a first device). Correspondingly, device #B receives the first indication information.

There may be two situations indicated by the first indication information:

Case 1:

The first indication information instructs the device #B to map the OSU cells into the STM-1 frame according to the first mode.

Case 2:

The first indication information instructs the device #B to map the OSU cells into the STM-1 frame according to the third mode.

S1002. The device #D sends third indication information to the device #C (an example of the second device).

There may also be two situations indicated by the third indication information:

Case 3:

Corresponding to case 1 in S1001, the third indication information instructs device #C to demap the STM-1 frame according to the second mode.

Case 4:

Corresponding to case 2 in S1001, the third indication information instructs device #C to demap the STM-1 frame according to the fourth mode.

S1003. Device #A maps data to OSU cells, then maps OSU cells to ODUk frames, and sends ODUk frames to device #B (an example of the first device). Accordingly, device #B receives the ODUk frame.

S1004, the device #B performs demapping processing on the received ODUk frame, and obtains an OSU cell.

S1005. The device #B maps the OSU cell into the STM-1 frame.

Device #B maps OSU cells to STM-1 frames in two cases:

Case 5:

Corresponding to case 1 in S1001, device #B maps OSU cells into STM-1 frames according to the first mode. For the specific mapping manner, refer to the description in S201-S207. That is, methods S201-S207 are performed by device #B.

Case 6:

Corresponding to case 2 in S1001, device #B maps OSU cells into STM-1 frames according to the third mode. For the specific mapping manner, refer to the description in S501-S506. That is, methods S501-S506 are performed by device #B.

S1006. The device #B sends the STM-1 frame to the device #C. Accordingly, device #C receives the STM-1 frame.

In another possible implementation manner, the device #B may multiplex multiple STM-1 frames into an STM-N frame, and send the STM-N frame to the device #C. Accordingly, device #C receives the STM-N frame.

S1007, the device #C performs demapping processing on the received STM-1 frame, and obtains an OSU cell.

The demapping process of the STM-1 frame by device #C can also be divided into two cases:

Case 7:

Corresponding to case 3 in S1002, device #C performs demapping processing on the received STM-1 frame according to the second mode. For the specific demapping manner, refer to the description in S401-S403, that is, the device #C executes the methods S401-S403.

Case 8:

Corresponding to case 4 in S1002, device #C performs demapping processing on the received STM-1 frame according to the fourth mode. For the specific demapping manner, reference may be made to the description in S801-S803, that is, the method S801-S803 is performed by the device #C.

S1008. The device #C performs demapping processing on the OSU cell to obtain data.

Figure 11 is a scenario applicable to the method proposed in this application. The device #E and the device #F are connected through the SDH/MSTP network, and the device #F and the device #G are connected through the OTN network. The device #H is the upper layer device of equipment #E, equipment #F, and equipment #G. For example, equipment #H can be a network management equipment, and equipment #H is used to control equipment #E, equipment #F, and equipment #G.

Assuming that device #E wants to send data to device #G, it can send data using the method shown in Figure 12, which includes:

S1201. The device #H (another example of the third device) sends first indication information to the device #E (another example of the first device).

Similar to S1001, there may be two situations indicated by the first indication information. For details, refer to the description of S1001.

S1202. The device #H sends third indication information to the device #F (another example of the second device).

Similar to S1002, there may be two situations indicated by the third indication information. For details, refer to the description of S1002.

S1203. Device #E (another example of the first device) maps data to OSU cells, then maps OSU cells to STM-1 frames, and sends STM-1 frames to device #F. Accordingly, device #F receives the STM-1 frame.

Similar to S1005, there are two cases where the device #E maps the OSU cell to the STM-1 frame. For details, refer to the description of S1005.

S1204, the device #F performs demapping processing on the received STM-1 frame, and obtains an OSU cell.

Similar to S1007, the demapping process performed by the device #F on the STM-1 frame can also be divided into two cases. For details, refer to the description of S1007.

S1205. The device #F maps the OSU cells into the ODUk frame.

S1206. The device #F sends the ODUk frame to the device #G. Correspondingly, device #G receives the ODUk frame.

S1207, the device #G performs demapping processing on the received ODUk frame, and obtains an OSU cell.

S1208. The device #G performs demapping processing on the OSU cell to obtain data.

According to the foregoing method, FIG. 13 is a communication device provided by an embodiment of the present application, and the communication device includes a transceiver unit 1301 and a processing unit 1302 . The transceiver unit 1301 can be used to implement the receiving and sending functions in the method embodiments. Other functions in the method embodiments may be implemented by the processing unit 1302 . The transceiver unit can be realized through the input interface and output interface in the data processing chip, and the sending and receiving in the method embodiment correspond to the output and input in the chip respectively. The transceiver unit 1301 can also be divided into a receiving unit and a sending unit. The receiving unit can be used to realize the receiving function in the method embodiment, and the sending unit can be used to realize the sending function in the method embodiment. The receiving unit can be realized through the output interface of the data processing chip, and the sending unit can be realized through the input interface of the data processing chip. In addition, the transceiver unit and the processing unit may be implemented by the same chip, which is not limited in this application. It should be understood that the transceiver unit 1301 in the embodiment of the present application may also be implemented by a transceiver (including a transmitter and a receiver) or a transceiver-related circuit component, and the processing unit 1302 may also be implemented by a processor or a processor-related circuit component (or, Called the processing circuit) implementation.

Exemplarily, the communication device may be a communication device, and may also be a chip applied in the communication device or other combined devices, components, etc. having the functions of the above-mentioned communication device.

Exemplarily, when the communication device is the first device, the transceiving unit 1301 and the processing unit 1302 can support actions performed by the first device in the foregoing method examples.

Exemplarily, when the communication device is the second device, the transceiving unit 1301 and the processing unit 1302 can support actions performed by the second device in the foregoing method examples.

The embodiment of the present application also provides a communication device, as shown in FIG. 14 , including: a processor 1401 , a communication interface 1402 , and a memory 1403 . Wherein, the processor 1401, the communication interface 1402 and the memory 1403 can be connected to each other through the bus 14014; the bus 14014 can be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus etc. The above bus 14014 can be divided into address bus, data bus and control bus. For ease of representation, only one thick line is used in FIG. 14 , but it does not mean that there is only one bus or one type of bus. The processor 1401 may be a central processing unit (central processing unit, CPU), a network processor (network processor, NP) or a combination of CPU and NP. The processor may further include hardware chips. The aforementioned hardware chip may be an application-specific integrated circuit (application-specific integrated circuit, ASIC), a programmable logic device (programmable logic device, PLD) or a combination thereof. The aforementioned PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field-programmable gate array (field-programmable gate array, FPGA), a general array logic (generic array logic, GAL) or any combination thereof. Memory 1403 may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (RAM), which acts as external cache memory.

The processor 1401 is used to implement data processing operations of the communication device. The communication interface 1402 is used to realize the transceiving operation of the communication device.

Exemplarily, when the communication apparatus is the first device, the processor 1401, the communication interface 1402, and the memory 1403 can support actions performed by the first device in the foregoing method examples.

Exemplarily, when the communication apparatus is the second device, the processor 1401, the communication interface 1402, and the memory 1403 can support actions performed by the second device in the foregoing method examples.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

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

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

A method for transmitting data, comprising:

The first device obtains an optical service unit OSU cell;

The first device maps the OSU cell to a first-level synchronous transport module STM-1 frame;

The first device sends the STM-1 frame to the second device.
The method of claim 1, wherein

The first device maps the OSU cell into a first-level synchronous transport module STM-1 frame, including:

The first device determines M first padding fields in the STM-1 frame, the size of each first padding field in the M first padding fields is greater than or equal to the size of an OSU cell, M is a positive integer;

When the OSU information element is scheduled, the first device fills the OSU information element into a first padding field;

When the OSU cell is not scheduled, the first device fills idle cells into the first padding field.
The method of claim 2, wherein

The first device maps the OSU cell into a first-level synchronous transport module STM-1 frame, and further includes:

The first device determines M second padding fields in the STM-1 frame, and the M second padding fields are in one-to-one correspondence with the M first padding fields;

The first device fills the first overhead information and the second overhead information in the i-th second padding field according to the filling condition of the i-th first padding field, and the i-th first padding field is the same as the The i second padding fields correspond to;

Wherein, the first overhead information indicates whether the ith first padding field is filled with the OSU cell, and when the ith first padding field is filled with the OSU cell, the The second overhead information indicates the bandwidth of the service corresponding to the OSU cell filled in the ith first padding field, where i is a positive integer less than or equal to M.
The method of claim 1, wherein

The first device maps the OSU cell into a first-level synchronous transport module STM-1 frame, including:

The first device determines a third padding field in the STM-1 frame;

When the OSU cell is dispatched, the first device fills the start delimiter, the OSU cell and the end delimiter into the third padding field, and the start delimiter is in the Before the OSU cell, the end delimiter character is after the OSU cell;

When the OSU cell is not scheduled, the first device fills idle cells into the third filling field.
The method of claim 4, wherein

The first device fills the start delimiter character, the OSU cell and the end delimiter character into the third padding field, including:

The first device encapsulates the start delimiter, the OSU cell, and the end delimiter, and fills the encapsulated OSU cell into the third padding field; or,

The first device sequentially fills the start delimiter character, the OSU cell, and the end delimiter character in the third padding field.
The method according to any one of claims 1-5, further comprising:

The first device receives first indication information from the third device, where the first indication information indicates a mode of mapping the OSU cell into the STM-1 frame.
A method as claimed in claims 1-6, characterized in that,

The first device maps the OSU cell into a first-level synchronous transport module STM-1 frame, and further includes:

The first device determines a fourth padding field in the STM-1 frame;

Filling, by the first device, second indication information in the fourth padding field, where the second indication information indicates a mode for demapping the STM-1 frame, where the demapping mode for the STM-1 frame The pattern corresponds to the pattern of mapping the OSU cell into the STM-1 frame.
A method for transmitting data, comprising:

The second device receives a first-level synchronous transport module STM-1 frame from the first device, and the STM-1 frame includes an OSU cell;

The second device demaps the STM-1 frame to obtain the OSU information element.
The method of claim 8, wherein

Demapping the STM-1 frame by the second device includes:

The second device retrieves M second padding fields in the STM-1 frame, the M second padding fields correspond to the M first padding fields one-to-one, and M is a positive integer;

Wherein, the i-th second padding field includes first overhead information, and the first overhead information indicates whether the ith first padding field is filled with the OSU cell, and the i-th first padding field is the same as The ith second padding field corresponds, i is a positive integer less than or equal to M;

When the first overhead information indicates that the i-th first padding field is filled with the OSU information element, the second device obtains the OSU information element from the i-th first padding field;

When the first overhead information indicates that the i-th first padding field is not filled with the OSU information element, the second device continues to search for other second padding fields.
The method of claim 9, wherein

The ith second padding field further includes second overhead information;

Demapping the STM-1 frame by the second device further includes:

When the first overhead information indicates that the i-th first padding field is filled with the OSU information element, the second device acquires the second overhead information, and the second overhead information indicates that the i-th The OSU cell filled in the i first padding fields corresponds to the bandwidth of the service.
The method of claim 8, wherein

Demapping the STM-1 frame by the second device includes:

The second device retrieves a third padding field in the STM-1 frame, the third padding field including a start delimiter and an end delimiter;

The second device acquires the OSU information element according to the start delimiter character and the end delimiter character.
The method of claim 11, wherein,

The second device acquires the OSU information element according to the start delimiter character and the end delimiter character, including:

The second device obtains the encapsulated OSU cell;

After the second device strips the start delimiter character and the end delimiter character in the encapsulated OSU cell, it acquires the OSU cell.
The method according to claim 11 or 12, characterized in that,

The third padding field also includes second overhead information, and the second overhead information indicates the bandwidth of the service corresponding to the OSU cell;

Demapping the STM-1 frame by the second device further includes:

The second device acquires the second overhead information from between the start delimiter character and the end delimiter character.
The method according to any one of claims 8-13, characterized in that,

Demapping the STM-1 frame by the second device further includes:

The second device acquires second indication information from the fourth padding field of the STM-1 frame, where the second indication information indicates a demapping mode for the STM-1 frame;

or,

The method also includes:

The second device receives third indication information from a third device, where the third indication information indicates a mode for demapping the STM-1 frame.
A communication device, characterized in that it includes:

The transceiver unit is used to obtain the optical service unit OSU cell;

A processing unit, configured to map the OSU cell into a first-level synchronous transport module STM-1 frame;

The transceiving unit is further configured to send the STM-1 frame to the second device.
A communication device as claimed in claim 15, characterized in that,

The processing unit is configured to map the OSU cell into a first-level synchronous transport module STM-1 frame, including:

The processing unit determines M first padding fields in the STM-1 frame, the size of each first padding field in the M first padding fields is greater than or equal to the size of an OSU cell, and M is positive integer;

When the OSU information element is dispatched, the processing unit fills the OSU information element into a first padding field;

When the OSU cells are not scheduled, the processing unit fills idle cells into the first filling field.
The communications device of claim 16, wherein:

The processing unit is configured to map the OSU cell into a first-level synchronous transport module STM-1 frame, and further includes:

The processing unit determines M second padding fields in the STM-1 frame, and the M second padding fields are in one-to-one correspondence with the M first padding fields;

The processing unit fills the first overhead information and the second overhead information in the i-th second padding field according to the filling condition of the i-th first padding field, and the i-th first padding field is the same as the i-th A second padding domain corresponds to;

Wherein, the first overhead information indicates whether the ith first padding field is filled with the OSU cell, and when the ith first padding field is filled with the OSU cell, the The second overhead information indicates the bandwidth of the service corresponding to the OSU cell filled in the ith first padding field, where i is a positive integer less than or equal to M.
A communication device as claimed in claim 15, characterized in that,

The processing unit is configured to map the OSU cell into a first-level synchronous transport module STM-1 frame, including:

The processing unit determines a third padding field in the STM-1 frame;

When the OSU cell is dispatched, the processing unit fills the start delimiter character, the OSU cell and the end delimiter character into the third padding field, and the start delimiter character is in the Before the OSU cell, the end delimiter character is after the OSU cell;

When the OSU cells are not scheduled, the processing unit fills idle units into the third filling field.
The communications device of claim 18, wherein:

The processing unit fills the start delimiter character, the OSU cell and the end delimiter character into the third filling field, including:

The processing unit encapsulates the start delimiter, the OSU cell, and the end delimiter, and fills the encapsulated OSU cell into the third padding field; or,

The processing unit sequentially fills the start delimiter character, the OSU cell and the end delimiter character in the third padding field.
The communication device according to any one of claims 15-19, characterized in that,

The transceiving unit is further configured to receive first indication information from a third device, where the first indication information indicates a mode of mapping the OSU cell into the STM-1 frame.
The communication device according to any one of claims 15-20, characterized in that,

The processing unit is configured to map the OSU cell into a first-level synchronous transport module STM-1 frame, and further includes:

The processing unit determines a fourth padding field in the STM-1 frame;

Filling, by the processing unit, second indication information in the fourth padding field, where the second indication information indicates a mode for demapping the STM-1 frame, where the mode for demapping the STM-1 frame It corresponds to the mode of mapping the OSU cell into the STM-1 frame.
A communication device, characterized in that it includes:

A transceiver unit, configured to receive a first-level synchronous transport module STM-1 frame from the first device, and the STM-1 frame includes an OSU cell;

A processing unit, configured to demap the STM-1 frame and obtain the OSU information element.
The communications device of claim 22, wherein:

The processing unit, configured to demap the STM-1 frame, includes:

The processing unit retrieves M second padding fields in the STM-1 frame, the M second padding fields correspond to the M first padding fields one-to-one, and M is a positive integer;

Wherein, the ith second padding field includes first overhead information, and the first overhead information indicates whether the ith first padding field is filled with the OSU cell, and the ith first padding field is related to The ith second padding field corresponds, i is a positive integer less than or equal to M;

When the first overhead information indicates that the i-th first padding field is filled with the OSU information element, the processing unit acquires the OSU information element from the i-th first padding field;

When the first overhead information indicates that the i-th first padding field is not filled with the OSU cell, the processing unit continues to search for other second padding fields.
The communications device of claim 23, wherein:

The ith second padding field further includes second overhead information;

The processing unit, configured to demap the STM-1 frame, further includes:

When the first overhead information indicates that the i-th first padding field is filled with the OSU information element, the processing unit acquires the second overhead information, and the second overhead information indicates that the i-th The bandwidth of the service corresponding to the OSU cell filled in the first padding field.
The communications device of claim 22, wherein:

The processing unit, configured to demap the STM-1 frame, includes:

The processing unit retrieves a third padding field in the STM-1 frame, the third padding field including a start delimiter character and an end delimiter character;

The processing unit acquires the OSU information element according to the start delimiter character and the end delimiter character.
The communications device of claim 25, wherein:

The processing unit acquires the OSU information element according to the start delimiter character and the end delimiter character, including:

The processing unit obtains the encapsulated OSU cell;

The processing unit acquires the OSU letter after stripping the start delimiter and the end delimiter in the encapsulated OSU letter.
A communication device as claimed in claim 25 or 26, characterized in that,

The third padding field further includes second overhead information, and the second overhead information indicates the bandwidth of the service corresponding to the OSU cell;

The processing unit, configured to demap the STM-1 frame, further includes:

The processing unit acquires the second overhead information from between the start delimiter character and the end delimiter character.
The communication device according to any one of claims 22-27, characterized in that,

The processing unit, configured to demap the STM-1 frame, further includes:

The processing unit acquires second indication information from the fourth padding field of the STM-1 frame, where the second indication information indicates a mode for demapping the STM-1 frame;

or,

The transceiving unit is further configured to receive third indication information from a third device, where the third indication information indicates a mode for demapping the STM-1 frame.
A communication device, characterized by comprising: a processor and a memory, the processor is used to execute computer programs or instructions stored in the memory, so that the communication device performs the process described in any one of claims 1-7. method described; or,

The communication device is made to execute the method according to any one of claims 8-14.
A computer-readable storage medium, characterized in that it includes a computer program or an instruction, and when the computer program or the instruction is run on a computer,

causing the computer to perform the method according to any one of claims 1-7; or,

The computer is made to execute the method according to any one of claims 8-14.
A chip system, characterized in that it includes: at least one processor for executing computer programs or instructions in memory,

causing the method according to any one of claims 1-7 to be implemented; or,

The method according to any one of claims 8-14 is realized.