WO2021013025A1

WO2021013025A1 - Data receiving method and apparatus, and data sending method and apparatus

Info

Publication number: WO2021013025A1
Application number: PCT/CN2020/102262
Authority: WO
Inventors: 曾纪瑞; 史磊; 鲁绪儒
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2019-07-24
Filing date: 2020-07-16
Publication date: 2021-01-28
Also published as: CN112291030A

Abstract

Disclosed are a data receiving method and apparatus, and a data sending method and apparatus. The data receiving method comprises: receiving a flexible optical transport network (FlexO) signal from at least one physical layer (PHY) interface; carrying out fixed-frame processing and decoding processing on the FlexO signal from each PHY interface to obtain a FlexO frame corresponding to each PHY interface; grouping the at least one PHY interface, and carrying out de-offset processing and overhead extraction processing on the FlexO frames corresponding to all the PHY interfaces in the same group, so as to obtain FlexO payloads corresponding to all the PHY interfaces in the same group; and demapping the FlexO payloads corresponding to all the PHY interfaces in the same group into client services.

Description

Data receiving method and device, data sending method and device

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office with an application number of 201910671526.5 on July 24, 2019. The entire content of this application is incorporated into this application by reference.

Technical field

This application relates to the field of optical communication technology, for example, to a data receiving method and device, and a data sending method and device.

Background technique

The bearer network has a new development trend in the application scenarios of the 5th Generation mobile communication system (the 5th Generation mobile communication system, 5G) era. The fronthaul, midhaul and backhaul applications of 5G services require optical transport networks (Optical Transport Network, OTN) equipment provides large bandwidth, low delay, high-precision time synchronization, flexible channel and packet switching support capabilities.

Although OTN equipment has large bandwidth processing capabilities, it needs further improvement in terms of delay performance and mapping flexibility.

Summary of the invention

This application provides a data receiving method and device, and a data sending method and device, which can perform flexible mapping processing and reduce delay.

This application provides a data receiving method, including:

Receiving at least one physical layer PHY interface flexible optical transport network FlexO signal;

Perform framing processing and decoding processing on the FlexO signal of each PHY interface to obtain the FlexO frame corresponding to each PHY interface;

Grouping the at least one PHY interface, performing offset removal processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group, to obtain the FlexO payload corresponding to each PHY interface in the same group;

Demap the FlexO payload corresponding to each PHY interface in the same group to customer services.

This application also provides a data sending method, including:

Mapping at least one customer service in the same group to at least one flexible rate optical channel data unit ODUflex frame;

Mapping the at least one ODUflex frame to FlexO frames of at least one physical layer PHY interface in the same group;

Perform overhead insertion processing and encoding processing on the FlexO frame of each PHY interface, and send it through the PHY interface.

This application also provides a data receiving device, including a receiving module, a first processing module, a second processing module, and a demapping module;

The receiving module is configured to receive at least one physical layer PHY interface flexible optical transport network FlexO signal;

The first processing module is configured to perform framing processing and decoding processing on the FlexO signal of each PHY interface to obtain the FlexO frame corresponding to each PHY interface;

The second processing module is configured to group the at least one PHY interface, perform offset removal processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group, to obtain the correspondence of each PHY interface in the same group FlexO payload;

The de-mapping module is set to de-map the FlexO payload corresponding to each PHY interface in the same group into customer services.

The present application also provides a data sending device, including a first mapping module, a second mapping module, and a sending module;

The first mapping module is configured to map at least one customer service in the same group to at least one flexible rate optical channel data unit ODUflex frame;

The second mapping module is configured to map the at least one ODUflex frame to FlexO frames of at least one physical layer PHY interface in the same group;

The sending module is configured to perform overhead insertion processing and encoding processing on the FlexO frame of each PHY interface, and send it through the PHY interface.

Description of the drawings

FIG. 1 is a schematic flowchart of a data receiving method provided by an embodiment of the present invention;

2 is a schematic diagram of a framing process in a data receiving direction according to an embodiment of the present invention;

FIG. 3 is a block diagram of an implementation of a data receiving direction (de-offset first) according to an embodiment of the present invention;

FIG. 4 is a block diagram of an implementation of a data receiving direction (post-offset) provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of a data receiving direction offset processing process according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a process for extracting overhead in a data receiving direction according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a process of demapping (time decomposition mapping) of data receiving directions provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of a processing process of data receiving direction demapping (empty decomposition mapping) provided by an embodiment of the present invention;

FIG. 9 is a schematic flowchart of a data sending method according to an embodiment of the present invention;

10 is a schematic diagram of a processing process of data transmission direction mapping (time division mapping) provided by an embodiment of the present invention;

11 is a schematic diagram of a processing process of data transmission direction mapping (space division mapping) provided by an embodiment of the present invention;

FIG. 12 is a schematic diagram of a processing process of overhead insertion in a data transmission direction according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a framing process in a data transmission direction according to an embodiment of the present invention;

FIG. 14 is a block diagram of an implementation of a data sending direction according to an embodiment of the present invention;

15 is a schematic structural diagram of a data receiving device provided by an embodiment of the present invention;

FIG. 16 is a schematic structural diagram of a data sending device provided by an embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described below in conjunction with the drawings.

The steps shown in the flowchart of the drawings may be executed in a computer system such as a set of computer-executable instructions. Also, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than here.

Example one

As shown in Figure 1, an embodiment of the present invention provides a data receiving method, including:

Step 101: Receive flexible optical transport network (Flexible Optical Transport Network, FlexO) signals of one or more physical layer (Physical, PHY) interfaces.

FlexO is an interface technology for signal interconnection, which realizes the transmission of services exceeding 100Gbit/s by binding multiple standard rate interfaces. When using the FlexO standard protocol (FlexO-Segment Routing (FlexO-Segment Routing, FlexO-SR)), the data traffic is first encapsulated into a flexible optical channel data unit (Flexible Optical Channel Data Unit, ODUflex), and then multiplexed to Optical channel data unit Cn (Optical Channel Data Unit-Cn, ODUCn) completes multiplex section and link monitoring (Path Monitor, PM), and finally maps it into FlexO frame through FlexO, and loads it to N PHY interfaces for transmission.

FlexO-SR uses 100G rate as the standard rate interface. This application uses 25G rate PHY as the basic unit combination, and supports 1.25G or 5G time slots to be combined into FlexO frames to meet the requirements of supporting FlexO services and realizing 5G fronthaul functions. Compared with FlexO-SR, the PHY rate is reduced and the time slot granularity is more finely divided, which makes the combination more flexible. The same service can be combined with multiple PHYs to form a group. Supporting up to N PHY combinations can support multiple different services together, that is, multiple groups can be supported.

Step 102: Perform framing processing and decoding processing on the FlexO signal of each PHY interface to obtain a FlexO frame corresponding to each PHY interface.

Figure 2 shows the framing process of each PHY receiving direction. The receiving direction finds the frame header after passing through the alignment marker (Alignment Marker, AM), and extracts the multi-frame indication signal for the off-chip overhead line as an overhead insertion indication. After framing, the service data is descrambled and output to the subsequent stage for decoding.

In an exemplary embodiment, the decoding process is Reed-Solomon codes (Reed-Solomon codes, RS codes) decoding.

The code here is a forward error correction channel coding, which is an effective polynomial generated by correcting over-sampling data. The encoding process first seeks redundancy for these polynomials at multiple points, and then transmits or stores them. When the receiver correctly receives enough points, it can restore the original polynomial, even if many points on the received polynomial are interfered by noise.

In an example of this embodiment, the decoding process supports RS (544, 514) or RS (528, 514), which can be selected according to the configuration.

Step 103: Group at least one PHY interface, and perform offset removal processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group to obtain the FlexO payload corresponding to each PHY interface in the same group.

In an exemplary embodiment, the performing offset removal processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group includes:

For the FlexO frame corresponding to each PHY interface in the same group, the offset processing is performed first, and then the overhead extraction processing is performed, as shown in FIG. 3; or, for the FlexO frame corresponding to each PHY interface in the same group For FlexO frames, overhead extraction processing is performed first, and then offset processing is performed, as shown in Figure 4.

In an exemplary embodiment, the offset removal processing includes:

Under the control of the read-write control circuit, the FlexO frame corresponding to each PHY interface in the same group is stored in the FIFO (First Input First Output) buffer corresponding to each PHY interface; Next, read the FlexO frame of the FIFO buffer corresponding to each PHY interface in the group at the same time to achieve the offset removal effect.

The read-write control circuit described in this application includes a read control circuit and a write control circuit, wherein the write control circuit is performed independently in a PHY unit; the read control circuit is configured by a central processing unit (CPU). The CPU first configures which PHYs form a group, and the FIFO in the same group starts a read operation at the same time when the CPU configuration output condition is met. All FIFOs can flexibly form multiple independent Groups.

After decoding, each PHY data removes the inter-PHY offset in Figure 5. Under the control of the read-write control circuit, the data is stored in the corresponding FIFO of each PHY; under the control of the circuit, multiple FIFOs read data at the same time to achieve the effect of offsetting. Under the CPU configuration, the read-write control circuit can de-offset different groups composed of N PHYs at the same time.

In Figure 6, the overhead is extracted after multi-frame framing, and the extracted overhead needs to be subjected to a cyclic redundancy check (Cyclic Redundancy Check, CRC), and the overhead can be processed only after the check is correct. The overhead is divided into two parts: PHY overhead and PM segment monitoring overhead. While performing CRC check, the extracted overhead is sent to the overhead line circuit to facilitate the off-chip processing of overhead.

Each PHY data stream after overhead extraction and overhead processing enters the demapping circuit. After stripping the FlexO overhead etc., only the payload part is written into the demapping circuit.

Step 104: Demap the FlexO payload corresponding to each PHY interface in the same group into client services.

In an exemplary embodiment, the demapping FlexO payload corresponding to each PHY interface in the same group into a client service includes:

Combine the FlexO payloads corresponding to all PHY interfaces in the same group into a flexible rate optical channel data unit ODUflex time division data stream. The ODUflex frame of each time slot carries the group number, time slot number and PHY interface number; according to the PHY interface and The mapping relationship of customer service ports is to demap the ODUflex frame of each time slot in the ODUflex time-division data stream to the corresponding customer service port.

Figure 7 is the processing of time decomposition mapping, where m is a natural number between 1 and N. As shown in Figure 7, in order to be compatible with the old OTN equipment, when the FlexO time slot uses 1.25G time slots, a 5G service occupies 4 time slots; when the FlexO time slot uses 5G time slots, a 5G service occupies 1 time Gap. Each PHY data is written into an independent buffer, and one PHY corresponds to a piece of random access memory (Random Access Memory, RAM). In the overhead processing, it is known which PHYs are included in the group. Through CPU configuration, all PHY data is combined into an ODUflex time-division data stream based on the multiplexing relationship of space division to time division. ODUflex in different groups forms a data stream. The stream synchronously outputs the PHY number, Group number, and time slot number. Each time slot ODUflex carries Group number, time slot number and PHY number; when this data stream is output to different client ports for de-mapping, each time slot data is allocated to different client service ports according to the CPU configuration to complete FlexO Payload cross demapping function. Simplify time slot cross processing complexity through time division multiplexing.

In another exemplary embodiment, the demapping the FlexO payload corresponding to each PHY interface in the same group into client services includes:

Write the FlexO payload corresponding to each PHY interface in the same group into the independent buffer corresponding to each PHY interface; according to the mapping relationship between the PHY interface and the customer service port, demap the FlexO payload in each independent buffer to Corresponding customer service port.

Fig. 8 is the processing of space decomposition mapping, where m is a natural number between 1 and N. In order to be compatible with old OTN equipment, when FlexO time slots use 1.25G time slots, a 5G service occupies 4 time slots; when FlexO time slots use 5G time slots, a 5G service occupies 1 time slot. Each PHY data is written into an independent buffer, and one PHY corresponds to a piece of RAM. In the overhead processing, it is known which PHYs are included in the Group. The payload stripped from each PHY carries the Group number, PHY number, and time slot number according to the overhead information. Based on these signals, a unified time slot number is generated. CPU configuration All time slot numbers are crossed to different customer service ports for demapping, and a maximum of N FlexO PHYs are supported, so this cross also has the same N copies.

Embodiment 2 Data sending method

As shown in FIG. 9, an embodiment of the present invention also provides a data sending method, including:

Step 901: Map one or more customer services in the same group to one or more ODUflex frames.

Step 902: Map the one or more ODUflex frames to FlexO frames of one or more physical layer PHY interfaces in the same group.

In an exemplary embodiment, the mapping the one or more ODUflex frames to FlexO frames of one or more PHY interfaces in the same group includes:

Combine the one or more ODUflex frames into an ODUflex time-division data stream, the ODUflex frame of each time slot carries the group number, the time slot number and the PHY interface number; the ODUflex frame of each time slot is stored according to the time slot number Linked list: Under the control of the time division self-oscillation circuit, read the ODUflex frame of each time slot, map it to the corresponding PHY interface in the same group, and align the output through the FIFO buffer.

This application includes multiple sets of time division self-oscillation circuits, multiple sets of time-division self-oscillation circuits are working at the same time, one set of time-division self-oscillation circuits corresponds to a group, and the output rate of these groups is output in time division; the rate indicates that the output conditions are met but it is not its turn When the group is output, the ODUflex frame of the group is temporarily stored. When it is the turn of the group to output, the ODUflex frame of each time slot is read, mapped to the corresponding PHY interface in the group, and aligned and output through the FIFO buffer.

Fig. 10 is a time division mapping circuit, where m is a natural number between 1 and N. Multiple input client-side services are processed into multiple ODUflex after the client-side mapping circuit. After these data are time-division multiplexed into a data stream, each time slot ODUflex carries the Group number, time slot number and PHY number (the carried PHY The number is configured by the CPU according to the transmission rate of each PHY interface, and the carried PHY number is the PHY number corresponding to the PHY to be loaded by the time slot ODUflex), and the data is stored in the linked list according to the time slot number. The linked list will read out each time slot data stored in the linked list according to the time slot relationship under the time-division self-oscillation control. Use Generic Mapping Procedure (GMP) or Border Gateway Multicast Protocol (BGMP) or Bit-synchronous Mapping Procedure (BMP) to map to ODTUF.ts, ODTUF.ts also carry Information such as Group, PHY port, time slot number, etc. are displayed. And fill in the Group and PHY configured by the CPU based on this information. When one PHY cannot hold multiple time slots mapped by the next ODUflex, the remaining time slots will be loaded into another PHY. These two PHYs belong to the same Group, PM The segment overhead is independent, and the PHY overhead belongs to the same Group. Which time slots are mapped to the same PHY and which PHYs form a group are all CPU configurations. The data read from the linked list enters the output FIFO after mapping processing, and the same group is output after alignment.

In another exemplary embodiment, the mapping the one or more ODUflex frames to FlexO frames of one or more PHY interfaces in the same group includes:

The one or more ODUflex frames are input into the FlexO mapping buffer, the number of FlexO mapping buffers is configured according to the number of service ports, and each FlexO mapping buffer is segmented according to the configured number of time slots; according to the PHY interface and customer service The port mapping relationship reads the ODUflex frame corresponding to the time slot corresponding to the FlexO mapping buffer, and maps it to the FlexO frame corresponding to the PHY interface in the same group.

Figure 11 is a space division mapping circuit, where m is a natural number between 1 and N. After each customer service is mapped to ODUflex, it is input into the FlexO mapping buffer. The buffers are arranged in service port units, and each service port corresponds to a piece of buffer; each piece of buffer is segmented according to the configured number of time slots. When mapping and fetching service data, according to the Group number, PHY number, and time slot number configured by the CPU, search the corresponding port RAM and time slot queue under the FlexO service rate control, read the data output of the corresponding time slot to frame.

The mapping circuit is mapped to N PHYs, and each PHY is an independently transmitted frame structure. Subsequent processing of overhead insertion, AM insertion, encoding, and distribution is performed in the unit of PHY.

Step 903: Perform overhead insertion processing and encoding processing on the FlexO frame of each PHY interface, and send it through the PHY interface.

When the mapped FlexO processes overhead in the sending direction, it selects CPU insertion overhead or overhead line insertion overhead or transparent transmission according to the configuration, as shown in Figure 12. Insert the AM header information after the overhead is processed.

The FlexO data after overhead processing can choose RS (544,514) or RS (528,514) encoding. Then it is sent to the framing processing circuit on the sending side for scrambling, multi-frame instruction extraction, and output, as shown in Figure 13.

In the sending direction, as shown in Figure 14, after the client side service is mapped to ODUflex, after FlexO mapping, the data stream is mapped to a maximum of N PHYs. Each PHY is an independently transmitted frame structure. The data after the mapping process is The PHY unit performs processing such as overhead insertion, AM insertion, encoding, and distribution.

Embodiment 3 Data receiving device

As shown in FIG. 15, an embodiment of the present invention also provides a data receiving device, including a receiving module 1501, a first processing module 1502, a second processing module 1503, and a demapping module 1504, wherein:

The receiving module 1501 is configured to receive FlexO signals of the flexible optical transport network of one or more physical layer PHY interfaces.

The first processing module 1502 is configured to perform framing processing and decoding processing on the FlexO signal of each PHY interface to obtain the FlexO frame corresponding to each PHY interface.

The second processing module 1503 is configured to group at least one PHY interface, and perform offset processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group to obtain the corresponding data for each PHY interface in the same group. FlexO payload.

The de-mapping module 1504 is configured to de-map the FlexO payload corresponding to each PHY interface in the same group into client services.

In an exemplary embodiment, the second processing module 1503 performs offset processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group, including:

The second processing module 1503 performs offset removal processing on the FlexO frame corresponding to each PHY interface in the same group, and then performs overhead extraction processing, as shown in FIG. 3; or, the second processing module 1503 performs The FlexO frame corresponding to each PHY interface in the same group is first subjected to overhead extraction processing, and then offset processing, as shown in Figure 4.

In an exemplary embodiment, the offset removal processing of the second processing module 1503 includes:

Under the control of the read-write control circuit, the FlexO frame corresponding to each PHY interface in the same group is stored in the FIFO buffer corresponding to the PHY interface; under the control of the read-write control circuit, each PHY in the group is read at the same time The FlexO frame of the FIFO buffer corresponding to the interface to achieve the effect of offset.

In an exemplary embodiment, the demapping module 1504 is configured to:

In another exemplary embodiment, the demapping module 1504 is configured to:

Write the FlexO payload corresponding to each PHY interface in the same group into the independent buffer corresponding to the PHY interface; according to the mapping relationship between the PHY interface and the customer service port, demap the FlexO payload in each independent buffer to the corresponding Customer service port.

Embodiment 4 Data sending device

As shown in FIG. 16, an embodiment of the present invention also provides a data sending device, including a first mapping module 1601, a second mapping module 1602, and a sending module 1603, wherein:

The first mapping module 1601 is configured to map one or more customer services in the same group into one or more flexible rate optical channel data unit ODUflex frames.

The second mapping module 1602 is configured to map the one or more ODUflex frames to FlexO frames of one or more physical layer PHY interfaces in the same group.

The sending module 1603 is configured to perform overhead insertion processing and encoding processing on the FlexO frame of each PHY interface, and send it through the PHY interface.

In an exemplary embodiment, the second mapping module 1602 is configured to:

In another exemplary embodiment, the second mapping module 1602 is configured to:

Specific embodiment one (de-offset first + time division mapping and demapping):

Compared with the standard FlexO 100G rate PHY, the embodiment of the present invention uses 25G rate PHY as the basic unit combination, and supports 1.25G or 5G timeslot combination into FlexO frames, so as to meet the requirements of supporting FlexO services and realizing 5G fronthaul functions. Compared with FlexO-SR, the PHY rate is reduced and the time slot granularity is more finely divided, which makes the combination more flexible. The same service can be combined with multiple PHYs to form a Group. Supporting up to N PHY combinations can support multiple different services together. That is, multiple groups can be supported.

See Figure 3. In the receiving direction, each PHY performs framing and decoding independently, and offsets are first performed among multiple PHYs in the same group. After offsetting, each PHY uses the PHY as the unit to perform overhead processing, obtains the Group number and the number sequence of different PHYs in the same Group according to the overhead, and generates Group alarm or interrupt information according to each PHY. Then go to demapping.

Figure 2 shows the framing process of each PHY receiving and sending direction. The receiving direction finds the frame header after fixed AM, and extracts the multi-frame indication signal for the off-chip overhead line as an overhead insertion indication. After framing, the service data is descrambled and output to the subsequent stage for decoding.

Decoding supports RS (544,514) or RS (528,514), which can be selected according to the configuration.

After decoding, each PHY data removes the inter-PHY offset in Figure 5. Under the control of the read-write control circuit, the data is stored in the corresponding FIFO of each PHY; under the control of the circuit, multiple FIFOs read the data at the same time to achieve the offset removal effect. Under the CPU configuration, the read-write control circuit can de-offset different groups composed of N PHYs at the same time.

In Figure 6, the overhead is extracted after multi-frame framing. The extracted overhead needs to be CRC, and the overhead can be processed after the verification is correct. The overhead is divided into two parts: PHY overhead and PM segment monitoring overhead. While performing CRC check, the extracted overhead is sent to the overhead line circuit to facilitate the off-chip processing of overhead.

Figure 7 is the processing of time decomposition mapping. In order to be compatible with old OTN equipment, when FlexO time slots use 1.25G time slots, a 5G service occupies 4 time slots; when FlexO time slots use 5G time slots, a 5G service occupies 1 time slot. Each PHY data is written into an independent buffer, and one PHY corresponds to a piece of RAM. In the overhead processing, it is known which PHYs are included in the group. Through CPU configuration, all PHY data is combined into an ODUflex time-division data stream based on the multiplexing relationship of space division to time division. ODUflex in different groups forms a data stream. The stream synchronously outputs the PHY number, Group number, and time slot number. Each time slot ODUflex carries Group number, time slot number and PHY number; when this data stream is output to different client ports for de-mapping, each time slot data is allocated to different client service ports according to the CPU configuration to complete FlexO Payload cross demapping function. Simplify time slot cross processing complexity through time division multiplexing.

In the sending direction, see Figure 14. After the client side service is mapped to ODUflex, it is combined into one ODUflex after space division to time division. The data stream is mapped to up to N PHYs. Each PHY is a frame structure for independent transmission, which is processed by mapping. The subsequent data is processed by overhead insertion, AM insertion, encoding, and distribution in units of PHY.

Figure 10 is a time division mapping circuit. Multiple input client-side services are processed into multiple ODUflex after the client-side mapping circuit. After these data are time-division multiplexed into a data stream, each time slot ODUflex carries the Group number, time slot number and PHY number, data is stored in the linked list according to the time slot number. The linked list will read each time slot data stored in the linked list according to the time slot relationship under the time-division self-oscillation control. Use GMP or BGMP or BMP to map to ODTUF.ts. ODTUF.ts also carries information such as Group, PHY port, and time slot number. And fill in the Group and PHY configured by the CPU based on this information. When one PHY cannot hold multiple time slots mapped by the next ODUflex, the remaining time slots will be loaded into another PHY. These two PHYs belong to the same Group, PM The segment overhead is independent, and the PHY overhead belongs to the same Group. Which time slots are mapped to the same PHY and which PHYs form a group are all CPU configurations. The data read from the linked list enters the output FIFO after mapping processing, and the same group is output after alignment.

When the mapped FlexO handles overhead processing in the sending direction, it selects CPU insertion overhead or overhead line insertion overhead or transparent transmission according to the configuration, as shown in Figure 12. Insert the AM header information after the overhead is processed.

The FlexO data after overhead processing can choose RS (544,514) or RS (528,514) encoding. Then it is sent to the framing processing circuit on the transmitting side for scrambling, multi-frame instruction extraction, and then output, as shown in Figure 13.

Specific implementation manner two (post offset + time division mapping and demapping):

As shown in Figure 4, in the receiving direction, each PHY independently performs framing and decoding. After overhead extraction and overhead processing, the Group number and the number sequence of different PHYs in the same Group are obtained according to the overhead, and the Group’s number is generated according to each PHY. Alarm or interrupt information; then offset and demap.

After decoding, the overhead is extracted by multi-frame framing in Figure 6, and the extracted overhead needs to be CRC, and the overhead can be processed after the verification is correct. The overhead is divided into two parts: PHY overhead and PM segment monitoring overhead. While performing CRC check, the extracted overhead is sent to the overhead line circuit to facilitate the off-chip processing of overhead.

Each PHY data after overhead extraction and overhead processing is shown in Figure 5 with the offset between PHYs removed. Under the control of the read-write control circuit, the data is stored in the corresponding FIFO of each PHY; under the control of the circuit, multiple FIFOs read the data at the same time to achieve the offset removal effect. Under the CPU configuration, the read-write control circuit can de-offset different groups composed of N PHYs at the same time.

After offsetting, it enters the demapping circuit, and only the payload part is written into the demapping circuit after stripping the FlexO overhead.

In the sending direction, as shown in Figure 14, after the client side service is mapped to ODUflex, it is combined into one ODUflex after space division to time division. The data stream is mapped to at most N PHYs. Each PHY is a frame structure for independent transmission, which is processed by mapping. The subsequent data is processed by overhead insertion, AM insertion, encoding, and distribution in units of PHY.

Figure 10 is a time division mapping circuit. Multiple input client-side services are processed into multiple ODUflex after the client-side mapping circuit. After these data are time-division multiplexed into a data stream, each time slot ODUflex carries the Group number, time slot number and PHY number, data is stored in the linked list according to the time slot number. The linked list will read out each time slot data stored in the linked list according to the time slot relationship under the time-division self-oscillation control. Use GMP or BGMP or BMP to map to ODTUF.ts. ODTUF.ts also carries information such as Group, PHY port, and time slot number. And fill in the Group and PHY configured by the CPU based on this information. When one PHY cannot hold multiple time slots mapped by the next ODUflex, the remaining time slots will be loaded into another PHY. These two PHYs belong to the same Group, PM The segment overhead is independent, and the PHY overhead belongs to the same Group. Which time slots are mapped to the same PHY and which PHYs form a group are all CPU configurations. The data read from the linked list enters the output FIFO after mapping processing, and the same group is output after alignment.

Specific implementation manner three (de-offset first + space division mapping and demapping):

Compared with the 100G rate PHY of the standard FlexO, the embodiment of the present invention adopts the 25G rate PHY as the basic unit combination, and supports 1.25G or 5G timeslot combination to form a FlexO frame, so as to meet the requirements of supporting FlexO services and realizing 5G fronthaul functions. Compared with FlexO-SR, the PHY rate is reduced and the time slot granularity is more finely divided, which makes the combination more flexible. The same service can be combined with multiple PHYs to form a Group. Supporting up to N PHY combinations can support multiple different services together. That is, multiple groups can be supported.

As shown in Figure 3, each PHY independently performs framing and decoding in the receiving direction, and offsets between multiple PHYs in the same Group. After offsetting, each PHY first performs overhead processing with PHY as the unit, and obtains the group number and the number sequence of different PHYs in the same group according to the overhead, and generates Group alarm or interrupt information according to each PHY.

Each PHY data after overhead extraction and overhead processing enters the demapping circuit. After stripping the FlexO overhead etc., only the payload part is written into the demapping circuit.

Fig. 8 is the processing of empty decomposition mapping. In order to be compatible with old OTN equipment, when FlexO time slots use 1.25G time slots, a 5G service occupies 4 time slots; when FlexO time slots use 5G time slots, a 5G service occupies 1 time slot. Each PHY data is written into an independent buffer, and one PHY corresponds to a piece of RAM. In the overhead processing, it is known which PHYs are included in the Group. The payload stripped from each PHY carries the Group number, PHY number, and time slot number according to the overhead information. Based on these signals, a unified time slot number is generated. CPU configuration All time slot numbers are crossed to different customer service ports for demapping, and a maximum of N FlexO PHYs are supported, so this cross also has the same N copies.

In the sending direction, see Figure 14. After the client side service is mapped to ODUflex, after FlexO mapping, the data stream is mapped to a maximum of N PHYs. Each PHY is an independently transmitted frame structure. The data after the mapping process is based on the PHY. The unit performs processing such as overhead insertion, AM insertion, encoding, and distribution.

Figure 11 is a space division mapping circuit. After each customer service is mapped to ODUflex, it is input into the FlexO mapping buffer. The buffers are arranged in service port units, and each service port corresponds to a piece of buffer; each piece of buffer is segmented according to the configured number of time slots. When mapping and fetching service data, according to the Group number, PHY number, and time slot number configured by the CPU, search the corresponding port RAM and time slot queue under the FlexO service rate control, read the data output of the corresponding time slot to frame.

Specific implementation manner four (post offset + space division mapping demapping):

As shown in Figure 4, each PHY independently performs framing and decoding in the receiving direction; after overhead extraction and overhead processing, the Group number and the number sequence of different PHYs in the same Group are obtained according to the overhead, and Group alarms are generated according to each PHY Or interrupt information. Then the offset is performed between multiple PHYs in the same group.

After offsetting, it enters the demapping circuit. After stripping the FlexO overhead etc., only the payload part is written into the demapping circuit.

This application takes 25G PHY (physical interface) as the processing unit, and supports a combination of up to N PHYs (up to N, depending on requirements). N PHYs can be flexibly combined to support services configured by the network management system, and the maximum capacity can be determined according to requirements. Each PHY has its own framing, decoding, encoding overhead processing and other processing procedures.

Using the method or device described in this application, compared with FlexO-SR, there is no ODUCn mapping and demapping process, which achieves the effect of reducing delay and supporting 5G fronthaul; it reuses the standard FlexO framing process to the greatest extent; Different customer services occupy different time slots in the FlexO frame for transmission in one PHY, or a high-speed service can be divided into multiple time slots for transmission through multiple PHYs forming a Group; support 1.25G time slots and 5G time slots, using flexible mapping The de-mapping method reduces resource consumption as much as possible and improves the flexibility of business processing.

Claims

A data receiving method includes:

Receiving at least one physical layer PHY interface flexible optical transport network FlexO signal;

Perform framing processing and decoding processing on the FlexO signal of each PHY interface to obtain the FlexO frame corresponding to each PHY interface;

Grouping the at least one PHY interface, performing offset removal processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group, to obtain the FlexO payload corresponding to each PHY interface in the same group;

Demap the FlexO payload corresponding to each PHY interface in the same group to customer services.
The method according to claim 1, wherein said performing offset removal processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group comprises:

For FlexO frames corresponding to each PHY interface in the same group, perform the offset removal process first, and then perform the overhead extraction process; or,

For the FlexO frame corresponding to each PHY interface in the same group, the overhead extraction processing is performed first, and then the offset removal processing is performed.
The method according to claim 1, wherein the de-offset processing includes:

Under the control of the read-write control circuit, storing the FlexO frame corresponding to each PHY interface in the same group into the first-in first-out FIFO buffer corresponding to the PHY interface;

Under the control of the read-write control circuit, the FlexO frame of the FIFO buffer corresponding to each PHY interface in the same group is read at the same time, so as to achieve the effect of offset removal.
The method according to claim 1, wherein the demapping the FlexO payload corresponding to each PHY interface in the same group into a client service comprises:

Combine FlexO payloads corresponding to all PHY interfaces in the same group into a flexible rate optical channel data unit ODUflex time-division data stream, where the ODUflex frame of each time slot in the ODUflex time-division data stream carries the group number, Slot number and PHY interface number;

According to the mapping relationship between the PHY interface and the customer service port, the ODUflex frame of each time slot in the ODUflex time-division data stream is demapped to the corresponding customer service port.
The method according to claim 1, wherein the demapping the FlexO payload corresponding to each PHY interface in the same group into a client service comprises:

Writing the FlexO payload corresponding to each PHY interface in the same group into an independent buffer corresponding to the PHY interface;

According to the mapping relationship between the PHY interface and the customer service port, the FlexO payload in each independent buffer is demapped to the corresponding customer service port.
A data transmission method includes:

Mapping at least one customer service in the same group to at least one flexible rate optical channel data unit ODUflex frame;

Mapping the at least one ODUflex frame into a flexible optical transport network FlexO frame of at least one physical layer PHY interface in the same group;

Perform overhead insertion processing and encoding processing on the FlexO frame of each PHY interface, and send it through the PHY interface.
The method according to claim 6, wherein the mapping the at least one ODUflex frame to a FlexO frame of at least one PHY interface in the same group comprises:

Combining the at least one ODUflex frame into one ODUflex time-division data stream, wherein the ODUflex frame of each time slot in the ODUflex time-division data stream carries a group number, a time slot number, and a PHY interface number;

Store the ODUflex frame of each time slot in the linked list according to the time slot number;

Under the control of the time division self-oscillation circuit, the ODUflex frame of each time slot is read, mapped to the corresponding PHY interface in the same group, and aligned and output through the first-in first-out FIFO buffer.
The method according to claim 6, wherein the mapping the at least one ODUflex frame to a FlexO frame of at least one PHY interface in the same group comprises:

Input the at least one ODUflex frame into the FlexO mapping buffer, the number of pieces of the FlexO mapping buffer is configured according to the number of service ports, and each piece of the FlexO mapping buffer is segmented according to the configured number of time slots;

According to the mapping relationship between the PHY interface and the customer service port, the ODUflex frame corresponding to the time slot corresponding to the FlexO mapping buffer is read and mapped to the FlexO frame corresponding to the PHY interface in the same group.
A data receiving device includes a receiving module, a first processing module, a second processing module, and a demapping module;

The receiving module is configured to receive a flexible optical transport network FlexO signal of at least one physical layer PHY interface;

The first processing module is configured to perform framing processing and decoding processing on the FlexO signal of each PHY interface to obtain a FlexO frame corresponding to each PHY interface;

The second processing module is configured to group the at least one PHY interface, and perform offset processing and overhead extraction processing on the FlexO frame corresponding to each PHY interface in the same group to obtain each PHY in the same group FlexO payload corresponding to the interface;

The de-mapping module is configured to de-map the FlexO payload corresponding to each PHY interface in the same group into client services.
A data sending device includes a first mapping module, a second mapping module, and a sending module;

The first mapping module is configured to map at least one customer service in the same group to at least one flexible rate optical channel data unit ODUflex frame;

The second mapping module is configured to map the at least one ODUflex frame into at least one flexible optical transport network FlexO frame of the physical layer PHY interface in the same group;

The sending module is configured to perform overhead insertion processing and encoding processing on the FlexO frame of each PHY interface, and send it through the PHY interface.