Patent Description:
FlexO standards, developed by the International Telecommunication Union (ITU-T), are important standards for an optical transmission device. An important characteristic of a FlexO transmission group is to realize a function of carrying a large bandwidth service by binding multiple Physical Layer (PHY) links with the same rate, referring to <FIG>. For example, <NUM> PHY links of <NUM> are bound to support a medium to access a customer service with a control rate of <NUM>, that is, the customer service is transmitted in multiple PHY links.

In related FlexO standards, for a mapping path of services, the services with different bandwidths are first mapped to a corresponding flexible Optical Channel Data Unit (ODU), namely ODUflex, then one or more ODUflex are multiplexed to an Optical Transform Unit (OUT) Cn of an Optical Transport Network (OTN) of B100G. There are time slots defined in the OTUCn, which may realize the multiplexing of multiple services. The current standard stipulates that the granularity of each time slot is <NUM>. After that, the OTUCn is divided into n OTUCs, and each OTUC is mapped to its own FlexO frame. Data of the FlexO frame is sent through an optional module with the corresponding rate. There is no time slot in the FlexO frame, but only a layer of encapsulation for the OTUC.

<NUM> bearing is one of the hottest research topics in the industry, and the FlexO becomes a potential technology for the <NUM> bearing due to its support for binding, channeling and other functions. In order to flatten a mapping multiplexing hierarchy, the current idea is to merge a FlexO layer and an OTUCn layer, that is, the time slots are defined directly in a net load area of the FlexO frame, and one or more ODUflex is directly multiplexed in the FlexO frame. However, as shown in <FIG>, because the FlexO binds multiple PHYs, the ODUflex may be mapped to the time slot of the FlexO frame of any PHY, which causes very high complexity in implementation of service transmission and high occupancy of logical processing units. Moreover, the complexity and occupancy of logical resources will increase with the increase in the number of PHYs bound.

<NPL>; and <NPL> provide respective technical solutions; however, the above mentioned problem still remains unsolved.

The main technical problem to be solved by a service transmission method and device using a FlexO, equipment and a storage medium which are provided by the embodiments of the present invention is high mapping complexity and high occupancy of logical resources during the implementation of service transmission using the related FlexO.

The present invention is defined by the appended independent claims, the dependent claims constitute embodiments of the invention, any other embodiment of the description not covered by the appended claims is to be considered as not being part of the present invention. To solve the above-mentioned technical problem, the embodiments of the present invention provide a service transmission method using a FlexO, which may include the following steps: Customer service data is mapped into N FlexO frames on M PHY links of a FlexO transmission group; the N FlexO frames are sent through the FlexO transmission group; the FlexO transmission group comprises M PHY links, wherein the M is greater than or equal to <NUM>, and the N is greater than or equal to the M. The customer service data occupies the same number of cells in the FlexO frame of each PHY link, and cell locations of the occupied cells are the same.

To solve the above-mentioned technical problem, the embodiments of the present invention also provide a service transmission method using a FlexO, which may include the following steps: N FlexO frames transmitted by using the FlexO transmission group are received; the customer service data is sequentially extracted from the N FlexO frames; the FlexO transmission group comprises M PHY links, wherein the M is greater than or equal to <NUM>. The N FlexO frames are the FlexO frames in the M PHY links. The customer service data occupies the same number of cells in the FlexO frame of each PHY link, and the cell locations of the occupied cells are the same.

To solve the above-mentioned technical problem, the embodiments of the present invention also provide a service transmission device using a FlexO, which may include a data processing module and a data sending module.

The data processing module is configured to map the customer service data into the N FlexO frames on the M PHY links of the FlexO transmission group.

The data sending module is configured to send the N FlexO frames through the FlexO transmission group.

The FlexO transmission group comprises M PHY links, wherein the M is greater than or equal to <NUM>, and the N is greater than or equal to the M. The customer service data occupies the same number of cells in the FlexO frame of each PHY link, and the cell locations of the occupied cells are the same.

To solve the above-mentioned technical problem, the embodiments of the present invention also provide a service transmission device using a FlexO, which may include a receiving module and a parsing module.

The receiving module is configured to receive the N FlexO frames transmitted by using the FlexO transmission group.

The parsing module is configured to sequentially extract the customer service data from the N FlexO frames.

The FlexO transmission group comprises M PHY links, wherein the M is greater than or equal to <NUM>. The N FlexO frames are the FlexO frames in the M PHY links. The customer service data occupies the same number of cells in the FlexO frame of each PHY link, and the cell locations of the occupied cells are the same.

To solve the above-mentioned technical problem, the embodiments of the present invention also provide sending end equipment, which includes: a first processor, a first memory and a first communication bus.

The first communication bus is configured to realize the communication connection between the first processor and the first memory.

The first processor is configured to execute one or more first program stored in the first memory, so as to implement the steps of the service transmission method using a FlexO.

To solve the above-mentioned technical problem, the embodiments of the present invention also provide receiving end equipment, which includes: a second processor, a second memory and a second communication bus.

The second communication bus is configured to realize the communication connection between the second processor and the second memory.

The second processor is configured to execute one or more second program stored in the second memory, so as to implement the steps of the service transmission method using a FlexO.

To solve the above-mentioned technical problem, the embodiments of the present invention also provide a computer-readable storage medium, which stores one or more first program. The one or more first program may be executed by one or more processor, so as to implement the steps of the service transmission method using a FlexO. Or, the computer-readable storage medium stores one or more second program. The one or more second program may be executed by one or more processor, so as to implement the steps of the service transmission method using a FlexO.

The present invention may achieve the following beneficial effects:
with the service transmission method and device using a FlexO, equipment and a storage medium provided by the embodiments of the present invention, the customer service data is mapped into N FlexO frames on M PHY links of the FlexO transmission group, and then the N FlexO frames are sent through the FlexO transmission group; and a receiving end sequentially extracts the customer service data from the N FlexO frames. The FlexO transmission group comprises M PHY links. The customer service data occupies the same number of cells in the FlexO frame of each PHY link, and the cell locations of the occupied cells are the same. That is, the embodiments of the present invention use a set of logic to directly map the customer service data into the N FlexO frames on the M PHY links of the FlexO transmission group, so as to minimize complexity and logical resources needing to be occupied.

Other features and corresponding beneficial effects of the present invention are elaborated in the latter part of the specification, and it should be understood that at least some of the beneficial effects become apparent from the records in the specification.

For making the purpose, technical solutions and the advantages of invention more clear, the embodiments of the present invention are further elaborated below by means of exemplary implementation modes combined with the accompanying drawings. It should be understood that the exemplary embodiments described here are intended only to explain the present invention and rather than limiting it.

For solving the problem of high mapping complexity and high occupancy of logical resources during the implementation of service transmission by using a related FlexO, in a service transmission method using a FlexO provided by the present embodiment, customer service data is mapped into N FlexO frames on M PHY links of a FlexO transmission group, and the customer service data occupies the same number of cells in the FlexO frame of each PHY link, and cell locations of the occupied cells are the same; that is, a set of logic is used to directly map the customer service data into the N FlexO frames on the M PHY links of the FlexO transmission group. That is, in the present embodiment, N FlexO frames on the M PHY links are merged into a logical whole frame, and then service mapping may be implemented using a set of logic, which can minimize complexity and logical resources needing to be occupied.

In the present embodiment, assuming that there are M PHY links between sending end equipment and receiving end equipment (that is, the FlexO transmission group used between the sending end equipment and the receiving end equipment has M PHY links), then when the FlexO frames are merged logically to obtain a logical whole frame, N FlexO frames on the M PHY links are directly merged logically, wherein M is greater or equal to <NUM>. The N FlexO frames include the FlexO frames of the M PHY links. The customer service data occupies the same number of cells in the FlexO frame of each PHY link, and the cell locations of the occupied cells are the same.

In the present embodiment, the type of the customer service data may be flexibly set according application scenarios, including, but not limited to, at least one of ODU service data, Ethernet service data or Synchronous Digital Hierarchy (SDH) service data.

In the present embodiment, N is greater than or equal to M, and the value of N is generally an integer multiple of M. The rates of M PHY links of the FlexO transmission group are generally the same. The method is also applicable to a situation where the rates of the M PHY links are different. When the bandwidth of the PHY link is the same as that of the FlexO frame, N and M are equal. When the bandwidth of the PHY link is L (L is greater than or equal to <NUM>) times the bandwidth of the FlexO frame, N is equal to L*M.

In an example, assuming that the FlexO transmission group includes M PHY links of <NUM>, and the bandwidth of the FlexO frame on each PHY link is <NUM>, then M is equal to N.

In another example, assuming that the FlexO transmission group includes M PHY links of <NUM>, and the bandwidth of the FlexO frame on each PHY link is <NUM>, that is, the value of L is <NUM>, then N is equal to <NUM>*M. It should be understood that in this case, in the PHY link of <NUM>, the customer service data comprises two interlaced FlexO frames of <NUM>, and when L is an integer greater than <NUM>, the rest can be done in the same manner.

To sum up, in an application scenario of the present embodiment, the bandwidth of the M PHY links may be set as equal to the bandwidth of the FlexO frame on each of the M PHY links.

For example, in an application scenario, referring to <FIG>, there are <NUM> PHY links bound between the sending end equipment and the receiving end equipment, and the bandwidth of the FlexO frame on each PHY link is equal to the bandwidth of the PHY link. Assuming that the numbers of the <NUM> PHY links are <NUM>, <NUM>, <NUM> and <NUM>, then correspondingly, the numbers of the FlexO frames of the <NUM> PHY links are also <NUM>, <NUM>, <NUM> and <NUM>. It should be understood that the exemplary number sequence here may be flexibly adjusted. In an example, assuming that the <NUM> PHY links have the same rate, for example, <NUM>, then the FlexO frames on the <NUM> PHY links may be logically merged into a logical whole frame. Each FlexO frame included in the logical whole frame is transmitted on its own PHY link, that is, each FlexO frame included in the logical whole frame is relatively independent. However, there is only one mapping situation when the customer service data is mapped, that is, only one set of logic is required, thus minimizing the complexity and resource occupancy of implementing service transmission.

As shown in the above examples, in the present embodiment, logically merging N FlexO frames is only a logical operation to facilitate mapping the customer service data and calculating the cell location occupied by it, and the N FlexO frames are not merged actually. An exemplary merging manner will be explained in a subsequent example.

Referring to <FIG>, the service transmission method using a FlexO at a sending end includes the following steps.

At S301, customer service data is mapped into N FlexO frames on M PHY links of a FlexO transmission group.

As shown above, in this case, the N FlexO frames on the M PHY links of may be logically regarded as a logical whole frame, and each FlexO frame included in the logical whole frame is transmitted on its own PHY link.

In the present embodiment, a non-OTN type service may be first mapped to an ODU signal in various mapping manners, which include, but not limited to, Asynchronous Mapping Procedure (AMP), Bit-synchronous Mapping Procedure (BMP), Generic Mapping Procedure (GMP), and Frame mapped Generic Framing Procedure (GFP-F); and an OTN type service is directly de-encapsulated to the ODU signal.

At S302, the N FlexO frames are sent to the receiving end equipment through the FlexO transmission group.

When sent, each FlexO frame is sent to the receiving end equipment by means of a corresponding optical module and its own PHY link.

For a better understanding, the present embodiment is illustrated below with an example of logical merging.

In the present embodiment, a net load area of the FlexO frame on the PHY link is divided into multiple fixed-size cells, and the number of cells depends on the size of the cells and the size of the net load area of the FlexO frame. When the net load area of the FlexO frame is fixed, the larger the cell is, the smaller the number of cells is; conversely, the smaller the cell is, the larger the number of cells is. In the present embodiment, the sizes of cell may also be set flexibly, such as <NUM> bits, <NUM> bits and <NUM> bits. The bandwidth of each cell is proportional to the bandwidth of the FlexO frame, and a schematic diagram of dividing the FlexO frame by the cell is shown in <FIG>.

As shown in the above analysis, when N FlexO frames are bound between the sending end and the receiving end to transmit the services, the N FlexO frames may be logically merged into a whole FlexO frame, correspondingly, the bandwidth of the logical whole FlexO frame is increased by N times, and the bandwidth of cell in the whole FlexO frame is increased by N times.

Based on the logically merging manner in the above example, referring to <FIG>, the process of carrying the customer service data to be sent in the net load area of the logical whole frame in the present embodiment includes the following steps.

At S501, the number of cells needing to be occupied by the customer service data in each FlexO frame is determined according to a service bandwidth of the service that the customer service data belongs to and N times a cell bandwidth of the cell in the FlexO frame.

In the present embodiment, the number of cells needing to be occupied by the customer service data in each FlexO frame may be obtained by dividing the service bandwidth of the customer service data by N times the cell bandwidth, and rounding up the quotient.

At S502, the location of each cell needing to be occupied by the customer service data in each FlexO frame is determined according to the number of cells needing to be occupied by the customer service data in each FlexO frame and the number of currently remaining idle cells (that is, the cells not occupied) in each FlexO frame.

In the present embodiment, the location of each cell needing to be occupied by the customer service data in each FlexO frame may be calculated using the sigma-delta algorithm. It should be understood that determination of the location is not limited to the exemplary algorithm, any other algorithm that can realize the function may also be applied.

At S503, the customer service data is mapped in turn to the cell at the corresponding location in each FlexO frame.

For example, the customer service data is mapped to the cell at the corresponding location in the FlexO frame in a unit of cell size in the net load area of the FlexO frame. In an example, a sequence may be that the customer service data is mapped in turn to the cell at the corresponding location in the FlexO frame in an ascending order of the frame numbers of the FlexO frames (it should be understood that the sequence may be set flexibly, for example, the customer service data is mapped in a descending order or other interval sequences). Specifically, according to the calculated location of each cell occupied by the service in each FlexO frame, the service may be loaded on the cell at the corresponding location of the N FlexO frames in an ascending order of the numbers of the N FlexO frames, referring to <FIG>. The cell locations carrying the same service in each FlexO frame are the same, that is, the processing logic of each FlexO frame is the same, which greatly simplifies hardware implementation.

In the present embodiment, after the number of cells needing to be occupied by the customer service data in each FlexO frame is obtained, the method further includes that: the number of cells needing to be occupied by the customer service data in each FlexO frame and the service type of the customer service data are set in the overhead of at least one FlexO frame.

Correspondingly, referring to <FIG>, the service transmission method using a FlexO at the receiving end includes the following steps.

At S701, N FlexO frames transmitted by the sending end using the FlexO transmission group are received.

At S702, the customer service data is sequentially extracted from the N FlexO frames (that is, the N FlexO frames belonging to a logical whole frame).

In the present embodiment, the overhead of at least one FlexO frame includes the number of cells needing to be occupied by the customer service data in each FlexO frame and the service type of the customer service data.

In the present embodiment, the overhead of at least one FlexO frame at least includes the number of whole frame cells occupied by the service of the customer service data.

Referring to <FIG>, that the customer service data is sequentially extracted from the N FlexO frames includes the following steps.

At S801, the location of each cell occupied by the customer service data in each FlexO frame is determined according to the number of cells occupied by the customer service data in each FlexO frame.

At S802, the customer service data is sequentially extracted from the cell at the corresponding location in each FlexO frame.

At S803, it is determined based on the service type whether to transform the extracted customer service data.

For example, when a service is determined as the non-OTN type service according to the service type in the overhead, the method further includes that the obtained customer service data is unmapped to restore transformation processing of the original data service.

Based on the above analysis, it can be seen that in the present embodiment, taking an ODU service for example, a service transport process exemplarily includes that:.

The N FlexO frames are sorted in order of numbers from small to large, and the customer service data is carried (that is, mapped) in turn to the corresponding cell locations of the N FlexO frames according to the cell location of each ODU service in the whole FlexO frame.

When the service type and the number of cells occupied are stored in the overhead of the FlexO frame, they may only be stored in the overhead of the FlexO frame with the smallest number, and the overhead transmission of M ODU services may be completed in a multi-frame manner; they may also be stored in the overhead of each FlexO frame. A schematic diagram of the overhead of a FlexO frame is shown in <FIG>. If H≤N, then the overhead transmission of H ODU services can be completed within one cycle. If H>N, then the overhead transmission of H ODU services needs to be completed in ceil(H/N) cycles. The overheads of H ODU services may be carried in an overhead area of N FlexO frames in an ascending order. The N FlexO frames are sent through K optical modules, wherein N≥K.

At the receiving end, optical signals are obtained from K optical modules to obtain the FlexO frames, and the FlexO frames are sorted in order of numbers from small to large.

Service type information of the ODU service and the number of cells occupied are obtained from the overhead of the FlexO frame.

According to the number of cells occupied by the ODU service and the total number of cells in the net load area of the FlexO frame, the location of the cell in the net load area of the FlexO frame is obtained according to the sigma-delta algorithm, and ODU service data (that is, the ODU signal) is extracted from the cell at the corresponding location in the N FlexO frames in an ascending order.

For the non-OTN type service, the extracted ODU signal is unmapped to restore the original data service.

It can be seen that in the present embodiment, the FlexO frames of N PHY links between the sending end equipment and the receiving end equipment are logically merged into a logical whole frame, then a mapping operation may be implemented using a set of logic, which greatly reduces the complexity of mapping when service transmission is implemented using the FlexO and reduces the occupied logical resources.

The present embodiment provides a service transmission device using a FlexO, which may be provided in the sending end equipment. Referring to <FIG>, the device includes a data processing module <NUM> and a data sending module <NUM>.

The data processing module <NUM> is configured to map the customer service data into the N FlexO frames on the M PHY links of the FlexO transmission group.

As shown in the above embodiments, the FlexO transmission group comprises M PHY links, wherein the M is greater than or equal to <NUM>, and the N is greater than or equal to the M. The customer service data occupies the same number of cells in the FlexO frame of each PHY link, and the cell locations of the occupied cells are the same.

The data sending module <NUM> is configured to send the N FlexO frames through the FlexO transmission group.

In the present embodiment, transmission rates of the M PHY links are the same, and of course, referring to the analysis in the above embodiments, the M PHY links are limited to the same transmission rate.

In the present embodiment, the data processing module <NUM> may be exemplarily configured to determine the number of cells needing to be occupied by the customer service data in each FlexO frame according to the service bandwidth of the service to which the customer service data belongs and N times the cell bandwidth of the cells in the FlexO frame, determine the location of each cell needing to be occupied by the customer service data in each FlexO frame according to the number of cells needing to be occupied by the customer service data in each FlexO frame and the number of currently remaining idle cells (that is, the cells not occupied) in each FlexO frame, and map the customer service data in turn to the cell at the corresponding location in each FlexO frame.

Specifically, the data processing module <NUM> may obtain the number of cells needing to be occupied by the customer service data in each FlexO frame by dividing the service bandwidth of the customer service data by N times the cell bandwidth, and rounding up the quotient. The specific mapping process is shown in the first embodiment and will not be repeated here.

Moreover, it should be understood that functions of the data processing module <NUM> and the data sending module <NUM> may be realized through a processor or a controller in the sending end equipment.

Referring to <FIG>, the present embodiment also provides a service transmission device using a FlexO which may be provided in the receiving end equipment. The device includes a receiving module <NUM> and a parsing module <NUM>.

The receiving module <NUM> is configured to receive the N FlexO frames transmitted by the sending end using the FlexO transmission group.

The parsing module <NUM> is configured to sequentially extract the customer service data from the N FlexO frames (that is, the N FlexO frames belonging to a logical whole frame).

As shown above, the logical whole frame is obtained by merging N FlexO frames in the M PHY links between the sending end equipment and the receiving end equipment. Each FlexO frame included in the logical whole frame is transmitted on its own PHY link.

In the present embodiment, the overhead of at least one FlexO frame includes the number of cells needing to be occupied by the customer service data in each FlexO frame and the service type of the customer service data. The parsing module <NUM> is configured to determine the location of each cell occupied by the customer service data in each FlexO frame according to the number of cells needing to be occupied by the customer service data in each FlexO frame, sequentially extract the customer service data from the cell at the corresponding location in each FlexO frame, and determine based on the service type whether to transform the extracted customer service data.

The exemplary process that the parsing module <NUM> extracts the customer service data is shown in the above embodiment and will not be repeated here.

It should be understood that functions of the data receiving module <NUM> and the parsing module <NUM> in the present embodiment may be exemplarily realized through a processor or a controller in the receiving end equipment.

The present embodiment also provides sending end equipment, which may be OTN equipment and includes, referring to <FIG>, a first processor <NUM>, a first memory <NUM> and a first communication bus <NUM>.

The first communication bus <NUM> is configured to realize a communication connection between the first processor <NUM> and the first memory <NUM>.

The first processor <NUM> is configured to execute one or more first program stored in the first memory <NUM>, so as to implement the steps of the service transmission method using a FlexO at the sending end in the above embodiments.

The present embodiment also provides receiving end equipment, which may be OTN equipment and includes, referring to <FIG>, a second processor <NUM>, a second memory <NUM> and a second communication bus <NUM>.

The second communication bus <NUM> is configured to realize a communication connection between the second processor <NUM> and the second memory <NUM>.

The second processor <NUM> is configured to execute one or more second program stored in the second memory <NUM>, so as to implement the steps of the service transmission method using a FlexO at the receiving end in the above embodiments.

The present embodiment also provides a computer-readable storage medium, which stores one or more first program. The one or more first program may be executed by one or more processor, so as to implement the steps of the service transmission method using a FlexO at the sending end.

Or, the computer-readable storage medium stores one or more second program. The one or more second program may be executed by one or more processor, so as to implement the steps of the service transmission method using a FlexO at the receiving end.

It should be understood that the computer-readable storage medium may be provided in the sending end equipment and/or the receiving end equipment.

In order to facilitate understanding the technical solution provided by the present invention, the present invention is further illustrated below taking two specific application scenarios for example.

In the application scenario, two pieces of OTN equipment transmit an ODU service the bandwidth of which is <NUM> (it should be understood that it may also be other types of service) by binding the FlexO transmission groups of three PHY links of <NUM>. The numbers of the FlexO frames on the three PHY links are respectively <NUM>, <NUM> and <NUM>, and the extra bandwidth may be used to transmit other services, as shown in <FIG>. The service transmission process in the scenario includes that:
the size of cell is set to <NUM> bits, the size of net load area of a FlexO frame is (<NUM>*<NUM>-<NUM>)=<NUM> bits, a total of <NUM>/<NUM>=<NUM> cells may be defined, and the bandwidth of each cell is FlexO net load bandwidth/<NUM>, which is about <NUM>.

At the sending end, three FlexO frames of <NUM> are merged into a whole FlexO frame. The bandwidth of the whole FlexO frame is <NUM>, and the bandwidth of each cell in the whole FlexO frame is about <NUM>. The merge here is only a logical operation to facilitate the calculation of the cell location occupied by the ODU service, and the FlexO frames are not merged actually.

The number of cells occupied by an ODU service of <NUM> is <NUM>*<NUM>/<NUM>≈<NUM>, that is, <NUM> cells are occupied.

The locations of the <NUM> cells occupied by the ODU service of <NUM> in <NUM> cells of the whole FlexO frame are calculated according to the sigma-delta algorithm.

The ODU service data of <NUM> is carried in turn in the cells corresponding to three FlexO frames which are sorted in order of numbers from small to large, that is, the first <NUM>-bit of the ODU service is placed on the first corresponding cell of the FlexO frame numbered <NUM>. The second <NUM>-bit of the ODU service is placed on the first corresponding cell of the FlexO frame numbered <NUM>, the third <NUM>-bit of the ODU service is placed on the first corresponding cell of the FlexO frame numbered <NUM>, the fourth <NUM>-bit of the ODU service is placed on the second corresponding cell of the FlexO frame numbered <NUM>, and so on. After the mapping, the cell locations of the ODU service in three FlexO frames are the same, and <NUM> cells are allocated to the ODU service in each FlexO frame, so the whole operation may be completed using only one set of logic.

The number of the ODU service and the number of cells occupied are stored in the overhead of the FlexO frame numbered <NUM>, while the other FlexO frames are not carried, and the data is sent through three optical modules of <NUM>.

At the receiving end, the data is received from three optical modules and aligned, the FlexO frame is restored, the number of the ODU service and information of the occupied cell are extracted from the overhead of the FlexO frame numbered <NUM>, and the location of the cell occupied by the ODU service in the FlexO frame is calculated according to the sigma-delta algorithm.

According to the obtained locations, the data is extracted in order of numbers of the locations from small to large to form the ODU service, that is, the data is extracted from the first corresponding cell of the FlexO frame numbered <NUM> as the first <NUM>-bit of the ODU service, the data is extracted from the first corresponding cell of the FlexO frame numbered <NUM> as the second <NUM>-bit of the ODU service, the data is extracted from the first corresponding cell of the FlexO frame numbered <NUM> as the third <NUM>-bit of the ODU service, the data is extracted from the second corresponding cell of the FlexO frame numbered <NUM> as the fourth <NUM>-bit of the ODU service, and so on, until the service is extracted.

In the application scenario, two pieces of OTN equipment transmit three ODU services the bandwidth of which are respectively <NUM>, <NUM> and <NUM> by binding the FlexO transmission groups of two PHY links of <NUM>. The numbers of the FlexO frames on the two PHY links are respectively <NUM> and <NUM>, as shown in <FIG>. The service transmission process in the scenario includes that:
the size of cell is set to <NUM> bits, the size of net load area of a FlexO frame is (<NUM>*<NUM>-<NUM>)=<NUM> bits, a total of <NUM>/<NUM>=<NUM> cells may be defined, and the bandwidth of each cell is FlexO net load bandwidth/<NUM>, which is about <NUM>.

At the sending end, two FlexO frames of <NUM> are merged into a whole FlexO frame. The bandwidth of the whole FlexO frame is <NUM>, and the bandwidth of each cell in the whole FlexO frame is about <NUM>. The merge here is only a logical operation to facilitate the calculation of the cell location occupied by the ODU service, and the FlexO frames are not merged actually.

The number of cells occupied by the ODU service of <NUM> is <NUM>*<NUM>/<NUM>=<NUM>, that is, <NUM> cells are occupied. The number of cells occupied by the ODU service of <NUM> is <NUM>*<NUM>/<NUM>=<NUM>, that is, <NUM> cells are occupied. The number of cells occupied by the ODU service of <NUM> is <NUM>*<NUM>/<NUM>=<NUM>, that is, <NUM> cells are occupied.

The locations of the <NUM> cells occupied by the ODU service of <NUM> in <NUM> cells of the whole FlexO frame, the locations of the <NUM> cells occupied by the ODU service of <NUM> in <NUM>-<NUM>=<NUM> cells of the whole FlexO frame, and the locations of the <NUM> cells occupied by the ODU service of <NUM> in <NUM>-<NUM>-<NUM>=<NUM> cells of the whole FlexO frame are calculated according to the sigma-delta algorithm.

The ODU service data of <NUM> is carried in turn in the cells corresponding to two FlexO frames which are sorted in order of numbers from small to large, that is, referring to <FIG>, the first <NUM>-bit of the ODU service of <NUM> is placed on the first corresponding cell of the FlexO frame numbered <NUM>, the second <NUM>-bit of the ODU service of <NUM> is placed on the first corresponding cell of the FlexO frame numbered <NUM>, the third <NUM>-bit of the ODU service of <NUM> is placed on the second corresponding cell of the FlexO frame numbered <NUM>, the fourth <NUM>-bit of the ODU service of <NUM> is placed on the second corresponding cell of the FlexO frame numbered <NUM>, and so on. The ODU service of <NUM> and the ODU service of <NUM> are implemented in the same way. After the mapping, the cell locations of the ODU service in the two FlexO frames are the same, and <NUM> cells, <NUM> cells and <NUM> cells are allocated to the ODU service of <NUM>, the ODU service of <NUM> and the ODU service of <NUM> in each FlexO frame <NUM>, so the whole operation may be completed using only one set of logic.

The number of the ODU service of <NUM> and the number of cells occupied by it are stored in the overhead of the first FlexO multi-frame on the PHY link numbered <NUM>, the number of the ODU service of <NUM> and the number of cells occupied by it are stored in the overhead of the first FlexO multi-frame on the PHY link numbered <NUM>, the number of the ODU service of <NUM> and the number of cells occupied by it are stored in the overhead of the second FlexO multi-frame on the PHY link numbered <NUM>, the corresponding location of the overhead of the second FlexO multi-frame on the PHY link numbered <NUM> is reserved. The data is sent through two optical modules of <NUM>.

At the receiving end, the data is received from two optical modules and aligned, the FlexO frame is restored, the number of the ODU service of <NUM> and information of the occupied cell are extracted from the overhead of the first FlexO multi-frame numbered <NUM>, the number of the ODU service of <NUM> and information of the occupied cell are extracted from the overhead of the first FlexO multi-frame numbered <NUM>, the number of the ODU service of <NUM> and information of the occupied cell are extracted from the overhead of the second FlexO multi-frame numbered <NUM>, and the location of the cell occupied by the ODU service in the FlexO frame is calculated according to the sigma-delta algorithm.

According to the obtained locations, the data is extracted in order of numbers of the locations from small to large to form the ODU service, that is, the data is extracted from the first corresponding cell of the FlexO frame numbered <NUM> as the first <NUM>-bit of the ODU service, the data is extracted from the first corresponding cell of the FlexO frame numbered <NUM> as the second <NUM>-bit of the ODU service, the data is extracted from the second corresponding cell of the FlexO frame numbered <NUM> as the third <NUM>-bit of the ODU service, the data is extracted from the second corresponding cell of the FlexO frame numbered <NUM> as the fourth <NUM>-bit of the ODU service, and so on, until the service is extracted.

It is apparent that those skilled in the art should appreciate that the above modules and steps in the embodiments of the present invention may be implemented by a general-purpose computing device, and they may be centralized in a single computing device or distributed on a network composed of multiple computing devices; optionally, they may be implemented by a program code which is capable of being executed by the computing device, so that they may be stored in computer storage media (an ROM/RAM, a magnetic disk, and a compact disc) and executed by the computing device; and in some situations, the presented or described steps may be executed in an order different from that described here; or they are made into integrated circuit modules, respectively; or multiple modules and steps of them are made into a single integrated circuit module to realize. Therefore, the present invention is not limited to any particular combination of hardware and software.

The above contents are further elaborations of the embodiments of the present invention made with reference to the exemplary implementation modes, but it should not be considered that the specific implementation of the present invention is limited to these elaborations. On the premise of not departing from the conception of the present invention, those ordinary skill in the art to which the present invention belongs may also make some simple deductions and replacements, which should fall within the scope of protection of the present invention as set out by the appended claims.

Claim 1:
A service transmission method using a Flexible Optical Transport Network, FlexO, comprising:
mapping (S301) customer service data into N FlexO frames on M Physical Layer, PHY, links of a FlexO transmission group; and
sending (S302) the N FlexO frames through the FlexO transmission group;
the FlexO transmission group comprises M PHY links, wherein the M is greater than or equal to <NUM>, and the N is greater than or equal to the M, characterized in that the customer service data occupies the same number of cells in the FlexO frame of each PHY link, and cell locations of the occupied cells are the same.