WO2020051851A1

WO2020051851A1 - Data transmission method and apparatus in optical transport network

Info

Publication number: WO2020051851A1
Application number: PCT/CN2018/105569
Authority: WO
Inventors: 苏伟; 维塞斯·马腾; 吴秋游
Original assignee: 华为技术有限公司
Priority date: 2018-09-13
Filing date: 2018-09-13
Publication date: 2020-03-19
Also published as: CN111989933A; CN111989933B

Abstract

The embodiments of the present application provide a data transmission method and apparatus in an optical transport network, wherein same are used for improving bandwidth utilization. A specific data transmission method comprises: a sending end mapping service data to an optical payload unit Cn (OPUCn) frame, wherein the OPUCn frame is composed of n optical payload unit C (OPUC) example frames, the n OPUC example frames comprise multiple types of OPUC example frames, time slot rates of time slots included in any two types of OPUC example frames of the multiple types of OPUC example frames are different, and n is an integer greater than 1; and the sending end sending the OPUCn frame to a receiving end. By introducing mixed time slot granularity into an OPUCn, network bandwidth utilization can be improved, and mapping complexity can be simplified.

Description

Data transmission method and device in optical transmission network

Technical field

The present application relates to the field of optical communication technologies, and in particular, to a data transmission method and device in an optical transmission network.

Background technique

Optical transport network (OTN) has rich operation, management, and maintenance (OAM) capabilities, powerful tandem connection monitoring (TCM) capabilities, and out-of-band forward error correction (forward error correction (FEC) capability, enabling flexible scheduling and management of large-capacity services.

In OTN, the sender can map service data to the optical payload unit Cn (OPUCn) frame, and then add the optical data unit Cn (optical data unit-Cn, ODUCn) overhead and optical transmission unit Cn (optical transport unit- Cn, OTUCn) get the encapsulated OTUCn, and send the OTUCn to the receiving end.

In the process of mapping service data to OPUCn, it is usually necessary to first map the service data to ODU0, ODU1, or ODUflex, and then map ODU0, ODU1, or ODUflex services whose bit rate is not an integer multiple of 5G to ODU2, ODU3, or ODU4, and then Map ODU2, ODU3, or ODU4 to one or more 5G time slots of OPUCn. This process will bring too much multiplexing processing and increase the processing complexity of the sender. In order to reduce processing complexity, ODU0, ODU1, or ODUflex services whose bit rate is not an integer multiple of 5G can be directly mapped to one or more 5G time slots of OPUCn, but this will waste bandwidth.

Summary of the Invention

The embodiments of the present application provide a data transmission method and device in an optical transmission network to improve bandwidth utilization.

In a first aspect, a data transmission method in an optical transmission network is provided, including: a transmitting end maps service data to an OPUCn frame, the OPUCn frame is composed of n OPUC instance frames, and the n OPUC instance frames include multiple OPUC instances Frame, any two kinds of OPUC instance frames have different timeslot rates, and n is an integer greater than 1; the sending end sends OPUCn frames to the receiving end. In the method provided by the first aspect, the OPUCn frame includes multiple OPUC instance frames. In the process of mapping the service data to an OPUCn frame, the sending end may select an appropriate OPUC instance frame for mapping according to the bit rate of the service data. On the one hand, this approach improves network bandwidth utilization. On the other hand, services do not need to go through multiple levels of mapping, reducing mapping complexity.

In a possible implementation manner, the service data is ODU0, ODU1, ODU2, ODU3, ODU4, or ODUflex.

In a possible implementation manner, the sending end maps the service data into the OPUCn frame, including: the sending end determines the type of the OPUC instance frame corresponding to the service data; the sending end maps the service data to the OPUC instance frame corresponding to the service data The kind of one or more OPUC instance frames. In this possible implementation manner, an appropriate OPUC instance frame can be selected for mapping according to the bit rate of service data, thereby improving bandwidth utilization.

In a possible implementation manner, the sending end maps the service data to one or more OPUC instance frames belonging to the type of the OPUC instance frame corresponding to the service data, including: the sending end adds the mapping overhead of the service data to the belonging service data. The type of the corresponding OPUC instance frame is in the ODTU of one or more OPUC instance frames, and the ODTU is multiplexed into the one or more OPUC instance frames. In this possible implementation manner, an appropriate OPUC instance frame can be selected for mapping according to the bit rate of service data, thereby improving bandwidth utilization.

In a possible implementation manner, the multiple OPUC instance frames include at least two OPUC instance frames of the following three OPUC instance frames: including 80 time slots with a rate of 1.25 Gbit / s (s) The OPUC instance frames of time slots include 20 OPUC instance frames of time slots with a time slot rate of 5 Gbit / s, and the OPUC instance frames of 4 time slots with a time slot rate of 25 Gbit / s. This possible implementation manner provides multiple possible OPUCn frames, so that the OPUCn frames provided by the embodiments of the present application can be adapted to different application scenarios.

In a possible implementation manner, one or more OPUC instance frames in the n OPUC instance frames include first indication information, and the first indication information is used to indicate a timeslot multiplexing structure used by the corresponding OPUC instance frame. . In this possible implementation manner, by including the first indication information in the OPUC instance frame, the device receiving the OPUCn frame determines the time slot multiplexing structure adopted by the OPUC instance frame in the OPUCn frame in order to extract service data.

In a possible implementation manner, each of the OPUC instance frames of the n OPUC instance frames includes second indication information, and the second indication information is used to indicate a occupancy situation of a timeslot of the corresponding OPUC instance frame. In this possible implementation manner, by including the second indication information in the OPUC instance frame, the device receiving the OPUCn frame can determine the occupation of the time slot in the OPUC instance frame in the OPUCn frame in order to extract service data.

In a possible implementation manner, the multiple OPUC instance frames include an OPUC instance frame including 80 time slots with a time slot rate of 1.25 Gbit / s, and include 80 time slots with a time slot rate of 1.25 Gbit / s. OPUC instance frames are obtained by increasing the rate of OPU4 frames. In this implementation method, for an OPUC instance frame containing 80 timeslots with a slot rate of 1.25 Gbit / s, it can be directly obtained by increasing the rate of the OPU4 frame without re-dividing the payload area of the OPUC instance frame. Reuses existing processing flow and reduces implementation complexity.

In a possible implementation manner, the OPUC instance frames belonging to the same type among the n OPUC instance frames share a multiframe indication. In this possible implementation manner, by sharing the multi-frame indication, compared with the inclusion of the multi-frame indication in each OPUC instance frame, the amount of information carried in OPUCn can be reduced, thereby improving the transmission efficiency of OPUCn frames.

In a second aspect, a data transmission method in an optical transmission network is provided, including: a receiving end receives an OPUCn frame, the OPUCn frame is composed of n OPUC instance frames, the n OPUC instance frames include multiple OPUC instance frames, and multiple OPUCs Any two types of time slots included in the instance frame have different time slot rates, and n is an integer greater than 1. The receiving end obtains service data from the time slots included in the n OPUC instance frames. In the method provided in the second aspect, since the OPUCn frame includes multiple OPUC instance frames, in the process of mapping the service data to an OPUCn frame, the transmitting end can select a suitable OPUC instance frame for mapping according to the bit rate of the service data, and the receiving end Service data can be obtained based on the received OPUCn frames. On the one hand, this approach improves network bandwidth utilization. On the other hand, the business does not need to go through multiple levels of mapping, reducing the complexity of the mapping.

In a possible implementation manner, the receiving end obtains service data from the timeslots included in the n OPUC instance frames, including: the receiving end determines the first information, where the first information is the number of timeslots and Time slot rate; the receiving end determines the second information, the second information is the time slot occupation of the time slots contained in the n OPUC instance frames; the receiving end determines the third information, the third information is the multi-frame indication of the n OPUC instance frames ; The receiving end demultiplexes the OPUCn frame according to the first information, the second information, and the third information to obtain an optical data branch unit ODTU; the receiving end demaps the service data from the ODTU. This possible implementation manner enables the receiving end to obtain service data from the OPUCn frame.

In a possible implementation manner, one or more OPUC instance frames in the n OPUC instance frames include first indication information, and the first indication information is used to indicate a timeslot multiplexing structure used by the corresponding OPUC instance frame. The receiving end determines the first information, including: the receiving end determines the first information according to the first indication information included in one or more OPUC instance frames in the n OPUC instance frames. In this possible implementation manner, the first indication information is included in the OPUC instance frame, so that the receiving end can determine the time slot multiplexing structure adopted by the OPUC instance frame in the OPUCn frame, thereby extracting service data.

In a possible implementation manner, each of the OPUC instance frames of the n OPUC instance frames includes second indication information, and the second indication information is used to indicate the occupation of the time slot of the corresponding OPUC instance frame. The receiving end determines The second information includes: the receiving end determines the second information according to the second indication information included in each OPUC instance frame of the n OPUC instance frames. In this possible implementation manner, the second indication information is included in the OPUC instance frame, so that the receiving end can determine the occupation of the time slot in the OPUC instance frame in the OPUCn frame, thereby extracting service data.

In a possible implementation manner, the OPUC instance frames belonging to the same type among the n OPUC instance frames share a multiframe indication, and the receiving end determines the third information, including: the receiving end according to at least one OPUC in the n OPUC instance frames The multi-frame indication contained in the example frame determines the third information. In this possible implementation manner, by sharing the multi-frame indication, compared with the inclusion of the multi-frame indication in each OPUC instance frame, the amount of information carried in OPUCn can be reduced, thereby improving the transmission efficiency of OPUCn frames.

In a possible implementation manner, the multiple OPUC instance frames include an OPUC instance frame including 80 time slots with a time slot rate of 1.25 Gbit / s, and include 80 time slots with a time slot rate of 1.25 Gbit / s. OPUC instance frames are obtained by increasing the rate of OPU4 frames. In this possible implementation manner, for an OPUC instance frame containing 80 time slots with a time slot rate of 1.25 Gbit / s, the rate can be directly obtained by increasing the rate of the OPU4 frame, and the payload area of the OPUC instance frame does not need to be renewed. Partitioning reduces implementation complexity.

According to a third aspect, a data transmission device in an optical transmission network is provided, and the device has a function of implementing any one of the methods provided in the first aspect. This function can be realized by hardware, and can also be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the functions described above. The device can exist in the form of a chip product.

In a fourth aspect, a data transmission device in an optical transmission network is provided, and the device has a function of implementing any one of the methods provided in the second aspect. This function can be realized by hardware, and can also be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the functions described above. The device can exist in the form of a chip product.

According to a fifth aspect, a data transmission device in an optical transmission network is provided, including: a memory and a processor, and may further include a communication interface. The communication interface, the memory, and the processor are connected through a communication bus. The memory is used to store instructions. The processor By executing the instruction, any one of the methods provided by the first aspect is implemented. The device can exist in the form of a chip product.

According to a sixth aspect, a data transmission device in an optical transmission network is provided, including: a memory and a processor, and may further include a communication interface. The communication interface, the memory, and the processor are connected through a communication bus. The memory is used to store instructions. The processor By executing the instruction, any one of the methods provided in the second aspect is implemented. The device can exist in the form of a chip product.

According to a seventh aspect, an OPUCn frame is provided, including: n OPUC instance frames, n OPUC instance frames including multiple OPUC instance frames, and any two types of OPUC instance frames in the OPUC instance frame. Gap rates are different, n is an integer greater than 1. The OPUCn frame provided in the seventh aspect introduces mixed slot granularity, including multiple OPUC instance frames. Therefore, when mapping the service data, the sender can perform service mapping according to the actual service rate. On the one hand, this approach improves network bandwidth utilization. On the other hand, the business does not need to go through multiple levels of mapping, which simplifies the complexity of the mapping.

In a possible implementation manner, one or more OPUC instance frames in the n OPUC instance frames include first indication information, and the first indication information is used to indicate a timeslot multiplexing structure used by the corresponding OPUC instance frame. . In this possible implementation manner, by including the first indication information in the OPUC instance frame, the device receiving the OPUCn frame can determine the time slot multiplexing structure adopted by the OPUC instance frame in the OPUCn frame in order to extract service data.

In a possible implementation manner, the multiple OPUC instance frames include an OPUC instance frame including 80 time slots with a time slot rate of 1.25 Gbit / s, and include 80 time slots with a time slot rate of 1.25 Gbit / s. OPUC instance frames are obtained by increasing the rate of OPU4 frames. In this possible implementation manner, for an OPUC instance frame containing 80 time slots with a time slot rate of 1.25 Gbit / s, the rate can be directly obtained by increasing the rate of the OPU4 frame, and the payload area of the OPUC instance frame does not need to be renewed Dividing can also reuse existing processing flows, reducing implementation complexity.

According to an eighth aspect, a transmitting end is provided, including: any one of the third aspect or the fifth aspect.

In a ninth aspect, a receiving end is provided, including: any device provided in the fourth aspect or the sixth aspect.

According to a tenth aspect, a communication system is provided, including: any device provided by the third aspect and any device provided by the fourth aspect; or any device provided by the fifth aspect and the device provided by the sixth aspect Any device; or a transmitter including any device provided in the third aspect and a receiver including any device provided in the fourth aspect; or a transmitter including any device provided in the fifth aspect And a receiving end including any one of the devices provided in the sixth aspect.

According to an eleventh aspect, a computer storage medium is provided, including: computer instructions that, when the computer instructions run on the computer, cause the computer to execute any one of the methods provided in the first aspect.

In a twelfth aspect, a computer storage medium is provided, including: computer instructions that, when the computer instructions run on the computer, cause the computer to execute any one of the methods provided in the second aspect.

According to a thirteenth aspect, a computer program product containing instructions is provided, and when the instructions are run on a computer, the computer is caused to execute any one of the methods provided by the first aspect.

A fourteenth aspect provides a computer program product containing instructions that, when the instructions run on a computer, cause the computer to execute any one of the methods provided by the second aspect.

For the technical effects brought by any one of the implementation manners from the third aspect to the sixth aspect, and from the eighth aspect to the fourteenth aspect, refer to the technical effects brought by the corresponding implementation manners in the first aspect or the second aspect. I will not repeat them here.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a network architecture applied in an embodiment of the present application; FIG.

FIG. 2 is a schematic diagram of a hardware structure of a possible OTN device; FIG.

3 is a schematic diagram of a frame structure of an OTUk frame;

4 is a schematic diagram of a frame structure of an OTUCn frame;

FIG. 5 is a schematic diagram of a possible time slot division of an OPUCn frame payload area according to an embodiment of the present application; FIG.

6 is a schematic diagram of a possible frame structure of an OPUCn frame according to an embodiment of the present application;

7 is a schematic diagram of 256 PSI bytes in 256 OPUC # 2 provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a possible time slot occupation situation provided by an embodiment of the present application; FIG.

FIG. 9 is a schematic diagram of another possible time slot occupation situation according to an embodiment of the present application; FIG.

10 is a schematic diagram of a frame structure of an OPUC instance frame provided by an embodiment of the present application;

11 is a flowchart of a data transmission method in an optical transmission network according to an embodiment of the present application;

12 is a schematic diagram of a possible mapping of service data provided by an embodiment of the present application;

FIG. 13 is another schematic diagram of mapping possible service data according to an embodiment of the present application; FIG.

14 is a schematic diagram of another possible time slot division of an OPUCn frame payload area according to an embodiment of the present application;

15 is a schematic diagram of another possible mapping of service data according to an embodiment of the present application;

16 is a schematic structural diagram of a communication device according to an embodiment of the present application;

17 is a schematic structural diagram of still another communication device according to an embodiment of the present application;

FIG. 18 is a schematic structural diagram of another communication device according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Among them, "and / or" in this article is only an association relationship describing the associated objects, which means that there can be three kinds of relationships. For example, A and / or B can indicate the following three situations: A alone, A and B, and B alone. In addition, "at least one" means one or more, and "multiple" means two or more.

The network architecture and service scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those of ordinary skill in the art may know that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

The embodiments of the present application are applicable to optical networks, such as OTN. An OTN is usually formed by connecting multiple OTN devices through optical fibers. Different types of topologies such as line, ring, and mesh can be formed according to specific requirements. The OTN shown in FIG. 1 is composed of two OTN networks (the OTN network 1 and the OTN network 2 respectively). Each OTN network consists of a certain number of OTN devices (indicated by N in Figure 1). The links between the devices in the OTN network are intra-domain links, and the links between the devices between the OTN networks are inter-domain links. . According to actual needs, an OTN device may have different functions. Generally speaking, OTN equipment is divided into optical layer equipment, electrical layer equipment, and optoelectronic hybrid equipment. Optical layer equipment refers to equipment capable of processing optical layer signals, such as: optical amplifiers (OA), optical add-drop multiplexers (OADM). OA can also be called optical line amplifier (OLA), which is mainly used to amplify optical signals to support longer distance transmission under the premise of ensuring the specific performance of optical signals. OADM is used to spatially transform an optical signal so that it can be output from different output ports (sometimes called directions). According to different capabilities, OADM can be divided into fixed OADM (fixed OADM, FOADM), configurable OADM (reconfigurable OADM, ROADM), and so on. Electrical layer devices refer to devices capable of processing electrical layer signals, for example, devices capable of processing ODU signals. Optoelectronic hybrid equipment refers to equipment with the ability to process optical layer signals and electrical layer signals. It should be noted that, according to specific integration needs, an OTN device can integrate a variety of different functions. The technical solutions provided in this application are applicable to OTN equipment of different forms and integration levels.

Figure 2 shows a schematic diagram of the hardware structure of an OTN device. Specifically, an OTN device includes a power supply, a fan, and an auxiliary board, and may also include a tributary board, a circuit board, a cross-connect board, and a system control and communication board. The circuit board may also be an optical layer processing board . It should be noted that, depending on the specific needs, the types and number of boards included in each device may be different. For example: the network equipment as the core node may not have a tributary board. A network device as an edge node may have multiple tributary boards. Among them, the power supply is used to supply power to OTN equipment, which may include main and backup power. The fan is used to cool the device. Auxiliary boards are used to provide auxiliary functions such as external alarms or access to an external clock. Tributary boards, cross boards, and circuit boards are mainly used to process OTN electrical layer signals (hereinafter referred to as OTN frames). Among them, the tributary board is used to receive and send various customer services, such as synchronous digital hierarchy (SDH) services, packet services, Ethernet services, and fronthaul services. Furthermore, the tributary board can be divided into a client-side optical module and a signal processor. The client-side optical module may be an optical transceiver for receiving and / or sending a client signal. The signal processor is used to implement the mapping and demapping processing of customer signals to OTN frames. The cross-connect board is used to realize the exchange of OTN frames and complete the exchange of one or more types of OTN frames. The line board mainly implements processing of OTN frames on the line side. Specifically, the circuit board can be divided into a line-side optical module and a signal processor. The line-side optical module may be a line-side optical transceiver, which is used to receive and / or send OTN frames. The signal processor is used to implement multiplexing and demultiplexing of OTN frames on the line side, or mapping and demapping processing. System control and communication boards are used to implement system control and communication. Specifically, information can be collected from different boards through the backplane, or control instructions can be sent to the corresponding boards. It should be noted that, unless otherwise specified, a specific component (for example, a signal processor) may be one or more, and this application does not make any limitation. It should also be noted that the embodiments of the present application do not place any restrictions on the types of boards included in the device and the specific functional design and number of boards.

On the electrical layer, the OTN frames processed by the OTN equipment can use the frame format defined by the International Telecommunication Union-Telecommunication Standard-Sector (ITU-T). For example, the G.709 standard and the G.709.1 standard, etc., are used to implement interworking between devices. OTN frames of various rates have been defined in existing standards, such as optical payload unit k (OPUk) frames, optical data unit k (ODUk) frames, and optical transmission unit k (optical transport unit-k, OTUk) frames. Among them, k = 0, 1, 2, 3, 4, Cn and flex respectively indicate that the bit rate is 1.25 Gbit / s (s), 2.5 Gbit / s, 10 Gbit / s, 40 Gbit / s, 100 Gbit / s , N * 100Gbit / s, n * 1.25Gbit / s (n≥2). It should be noted that the bit rates mentioned above are all approximate values. For example, the bit rate of the OPU4 frame is more accurately 104.35597533 Gbit / s, and the OPU4 frame contains 80 time slots, so the bit rate of each time slot is approximately 1.301683217 Gbit / s.

FIG. 3 shows a frame structure diagram of an OTUk (k is not equal to Cn) frame. As shown in Figure 3, an OTUk frame has 4 rows by 4080 columns. The OPUk payload area and the OPUk overhead area (that is, OPUk) constitute the OPUk frame. The OPUk frame and the ODUk overhead area (that is, ODUk) constitute the ODUk frame. The ODUk frame, the OTUk overhead area (that is, OTUkOH), and the frame alignment signal ( A frame alignment (FAS) and a forward error correction (FEC) check area constitute an OTUk frame. Specifically, columns 1 to 7 of the first row in the OTUk frame are FAS and multiframe alignment signals (MFAS), columns 8 to 14 of the first row are OTUk OH, and columns 1 to 2 of the 4th to 4th rows are OTUk. 14 columns are ODUk OH, 15th to 16th columns in rows 1 to 4 are OPUkOH, 17 to 3824 in rows 1 to 4 are OPUk payload areas, and 3825 to 4080 in rows 1 to 4 are FEC check. Area.

When k = Cn, as shown in FIG. 4, the OTUCn frame is composed of n OTUC instance frames (denoted as OTUC # 1 to OTUC # n in FIG. 4), and the OTUC instance frame does not include the FEC check area. An OTUCn frame includes an OPUCn frame (that is, columns 15 to 3824 in an OTUCn frame), and an OPUCn frame consists of n OPUC instance frames (that is, columns 15 to 3824 in an OTUC instance frame). The payload area of the OPUCn frame may be composed of the payload areas of the n OPUC instance frames interleaved according to a certain number of bytes. For example, interpolate by 16 columns. It should be noted that the OTUC instance frame refers to a basic frame unit constituting an OTUCn frame, and may also be referred to as an OTUC basic frame or another name, which is not limited in this application.

The existing OPUC instance frame contains 20 time slots with a time slot rate of 5 Gbit / s. It can be understood that if ODU0, ODU1, or ODUflex whose bit rate is not an integer multiple of 5 Gbit / s is directly mapped to one or more 5 Gbit / s time slots (that is, time slots with a time slot rate of 5 Gbit / s), Since these bit rates cannot occupy the slot rate of the entire 5Gbit / s time slot, there will be a waste of bandwidth.

In order to understand the present application more clearly, some of the concepts used in the embodiments of the present application are briefly introduced below.

For the convenience of description, in the embodiments of the present application, “bit rate is XGbit / s” is described below as “bit rate is XG”, and the bit rate here may also be replaced with a slot rate. The time slot rate refers to the bit rate of a time slot. A time slot with a time slot rate of XG can be referred to as an XG time slot. For example, a time slot with a time slot rate of 5G can be referred to as a 5G time slot. M timeslots with a time slot rate of XG can be simply described as M * XG timeslots. For example, 80 timeslots with a time slot rate of 1.25G can be simply described as 80 * 1.25G time slots. The above X is a numerical value, for example: X = 5, X = 1.25, and the like. M is an integer greater than 0.

The r-th OPUC instance frame in the OPUCn frame can be recorded as OPUC # r. For example, the fifth OPUC instance frame in the OPUCn frame is recorded as OPUC # 5. The r-th OPUC instance frame in consecutive OPUCn frames may be referred to as the r-th OPUC instance frame, that is, the consecutive OPUCn frames are composed of n-way OPUC instance frames. The OPUCn frame mentioned in this article can be a single OPUCn frame or a multi-frame composed of multiple consecutive OPUCn single frames. Similarly, an OPUC instance frame can be an OPUC single frame or an OPUC instance. A multi-frame composed of multiple consecutive OPUC instance frames in a frame. Here, r is an integer greater than 0 and less than or equal to n. To simplify the description, the OPUCn frame is also referred to as OPUCn, and the OPUC instance frame is also referred to as OPUC.

If the payload area of an OPUC is divided into M slots, the mth slot in the M slots is denoted as TS # m. For example, the second 5G time slot in an OPUC can be recorded as 5G TS # 2. The structure composed of ts timeslots among M timeslots is called an optical data tributary unit C (ODTUC), and is recorded as ODTUC.ts. Wherein, m and ts are integers greater than 0 and less than or equal to M. Similarly, for n 'OPUCs in OPUCn, if the payload area of each OPUC is divided into M time slots, then ts times in n' * M time slots in the n 'OPUCs The structure formed by the gap is called an optical data branch unit Cn '(optical data tributary unit Cn', ODTUCn '), and it is recorded as ODTUCn'.ts. Among them, ts is an integer greater than 0 and less than or equal to n '* M, and n' is an integer greater than 0 and less than n. The ODTU mentioned below in this application may refer to ODTUC or ODTUCn '.

An OTN frame can be divided based on time slots of different rates. Correspondingly, the OTN frame may include a different number of time slots. For example, when the slot rate (also called slot granularity) is 1.25G, 5G, and 25G, a 100G OTN frame includes 80, 20, and 4 timeslots, respectively. A combination of the number of time slots and the time slot rate may correspond to a time slot multiplexing structure. Exemplarily, Table 1 shows the correspondence between the slot multiplexing structure and the combination of the number of slots and the slot rate. It should be noted that the OTN frame refers to any kind of data frame that may be used in the OTN. For example, the aforementioned OPUC, OPUCn, ODUCn or OTUCn.

Table 1

时隙复用结构Time slot multiplexing structure	时隙数量和时隙速率的组合Combination of timeslot number and timeslot rate
11	801.25G时隙80 1.25G time slot
22	205G时隙20 5G time slot
33	425G时隙4 25G time slot

An embodiment of the present application provides an OPUCn, which includes: n OPUCs, n OPUCs including multiple OPUCs, and any two types of OPUCs in different OPUCs have different timeslot rates, and n is an integer greater than 1.

The type of OPUC included in OPUCn and the slot rate and / or the number of time slots of multiple timeslots included in OPUC may be pre-configured. An OPUC corresponds to a time slot multiplexing structure. It should be noted that the rate of OPUC is constant. Therefore, the number of time slots included in the OPUC can be determined according to the time slot rate of the time slots included in the OPUC. Similarly, the slot rate of the time slot included in OPUC can be determined according to the number of time slots included in OPUC.

Optionally, the multiple OPUCs include at least two of the following three types of OPUCs: OPUCs that include 80 time slots with a slot rate of 1.25G (that is, OPUCs that include 80 * 1.25G time slots, including 20 time slots) The OPUC with a slot rate of 5G (that is, an OPUC containing 20 * 5G time slots), and the OPUC containing 4 slots with a rate of 25G (that is, an OPUC containing 4 * 25G time slots). Table 2 is an example. The figure shows the combination of the number of time slots and the time slot rate corresponding to the four OPUCs.

Table 2

OPUC的种类Types of OPUC	时隙数量和时隙速率的组合Combination of timeslot number and timeslot rate
第一种OPUCThe first OPUC	801.25G时隙80 1.25G time slot

第二种OPUCSecond OPUC	205G时隙20 5G time slot

第三种OPUCThird OPUC	425G时隙4 25G time slot

Fourth OPUC

40 * 2.5G time slot

It should be noted that, in the embodiments of the present application, only multiple OPUCs are exemplarily described, and the types of OPUCs included in multiple OPUCs are not specifically limited. In actual implementation, the type of OPUC can be determined according to the actual application scenario. For example, multiple OPUCs include at least two OPUCs in the following OPUCs: OPUC including 80 * 1.25G time slots, OPUC including 100 * 1G time slots, OPUC including 40 * 2.5G time slots, and 20 * 5G OPUC including slots, OPUC including 10 * 10G time slots, and OPUC including 4 * 25G time slots.

The embodiments of the present application provide multiple possible OPUCn, so that the OPUCn provided by the embodiment of the present application can be adapted to different application scenarios.

Taking OPUCn including a first OPUC, a second OPUC, and a third OPUC as an example, FIG. 5 shows a schematic diagram of time slot division of a payload area of n OPUCs in an OPUCn. Among them, the payload area of the first OPUC is sequentially divided into 80 * 1.25G timeslots in units of x1 bytes, and the payload area of the nth OPUC is sequentially divided into 4 * 25G timeslots in units of x2 bytes. The payload area of OPUC is divided into 20 * 5G time slots in order of x3 bytes, and x1, x2, and x3 are all positive integers. Any two of these three values can be the same or different. In FIG. 5, x1 = x2 = x3 is taken as an example for drawing.

It should be noted that when the payload area of an OPUC cannot be completely divided into M time slots, some columns in the payload area of the OPUC may be used to fill information. For example, referring to FIG. 6, the column 3817 to 3824 of the payload area of the OPUCn shown in FIG. 5 may be padding information (ie, the FS area in FIG. 6).

For the newly defined OPUC in this application (that is, non-5G slot granularity OPUC, for example, the first OPUC and the third OPUC), it can be obtained by further time slot division or time slot combination through the existing OPUC (hereinafter referred to as the method for short) 1), or can be obtained by dividing the time slot of the OPUC (hereinafter referred to as mode 2). These two methods are further described below.

Method 1. The time slot division or time slot combination in the second OPUC is used to obtain

Case 1. For the third OPUC mentioned in Table 2, the implementation of the first OPUC may include: combining time slots of 20 5G time slots in the second OPUC, and combining 5 5G time slots into one 25G. The time slot is changed into four 25G time slots to obtain the third OPUC. For example, TS # 1, TS # 5, TS # 9, TS # 13, and TS # 17 in the second OPUC are combined into TS # 1 in the third OPUC, and TS # 2 in the second OPUC , TS # 6, TS # 10, TS # 14, and TS # 18 are combined into TS # 2 in the third OPUC, and TS # 3, TS # 7, TS # 11, TS # in the second OPUC 15 and TS # 19 are combined into TS # 3 in the third OPUC, and TS # 4, TS # 8, TS # 12, TS # 16, and TS # 20 in the second OPUC are combined into the third OPUC TS # 4.

Case 2: For the fourth OPUC mentioned in Table 2, the implementation of the first OPUC may include: time slot division of 20 5G time slots in the second OPUC, each 5G time slot is divided into two 2.5 The G time slot is changed to 40 2.5G time slots to obtain the fourth OPUC.

It should be noted that when an OPUC includes M time slots, a multiframe of M frames of the OPUC may be used as a time slot division period. However, in the embodiment of the present application, the OPUC (non-second The multi-frame of M frames of OPUC) is used as the slot division period, and the multi-frame of 20 frames of the second OPUC may also be used as the slot division period. In the former method, each OPUC can have different time slot division periods, making the time slot division period of each OPUC more flexible. The latter method reuses the existing OPUC's 20 * 5G time slot division cycle, reuses some functions, and reduces certain processing complexity.

Method 2: The time slot is divided into the payload area of the OPUC.

In case 1, the implementation of the method 2 may include: directly dividing the payload area of the OPUC into 4 time slots to obtain a third OPUC.

Case 3: For the first OPUC mentioned in Table 2, the specific implementation method 2 may include: directly dividing the payload area of the OPUC into 80 time slots to obtain the first OPUC. Alternatively, when the first OPUC is included in a plurality of OPUCs, the first OPUC may be obtained by increasing the rate of the OPU4 frame. In this case, there is no need to re-divide the payload area of OPUC, which reduces the implementation complexity.

When OPUC includes 80 time slots, the time slot rate of the time slot in OPUC is actually 1.3101953885G. Since the OPU4 frame contains 80 time slots, in order to reuse the existing processing flow and reduce the implementation complexity, OPU4 The bit rate of the frame is increased to the bit rate of OPUC, so that the OPU4 frame becomes an OPUC including 80 time slots, thereby increasing the types of OPUC.

The OPUCn provided in the embodiment of the present application introduces mixed slot granularity, including multiple OPUCs. Therefore, when transmitting service data, the transmitting end can perform mapping according to the actual service rate. For example, service data with a bit rate of 1.25G can be mapped into a 1.25G time slot of the first OPUC. On the one hand, this approach improves network bandwidth utilization. On the other hand, the business does not need to go through multiple levels of mapping, which simplifies the complexity of the mapping.

Compared with the OPUCn in the prior art, a new OPUC type is added to the OPUCn provided in the embodiment of the present application. Therefore, some overhead needs to be defined to indicate parameters related to the newly defined OPUC.

Optionally, one or more OPUCs in the n OPUCs include first indication information, and the first indication information is used to indicate a timeslot multiplexing structure adopted by the corresponding OPUC. For continuous OPUCn, "one or more OPUCs" means "one or more OPUCs", and the first indication information is used to indicate a time slot multiplexing structure used by all OPUCs in the corresponding way.

Each of the n OPUCs may indicate its own time slot multiplexing structure by including the first indication information. Alternatively, the first indication information included in an OPUC may also be used to indicate a timeslot multiplexing structure used by multiple OPUCs having the same timeslot multiplexing structure. Exemplarily, if the time slot multiplexing structure used by the first 20 OPUCs in OPUCn (n = 80) is 80 * 1.25G, the time slot multiplexing structure used by the middle 30 OPUCs is 20 * 5G, and the last 30 OPUCs The time slot multiplexing structure used is 4 * 25G. The first indication information contained in OPUC # 1 can be used to indicate the time slot multiplexing structure used by the first 20 OPUCs, and the first indication information contained in OPUC # 21 can be used to indicate the time slot repetition used by the middle 30 OPUCs. With the structure, the first indication information contained in OPUC # 51 can be used to indicate the time slot multiplexing structure adopted by the last 30 OPUCs.

In this optional method, by including the first indication information in OPUC, a device receiving OPUCn can determine a time slot multiplexing structure adopted by OPUC in OPUCn, so as to extract service data.

Optionally, each of the n OPUCs includes second indication information, and the information is used to indicate a slot occupation situation of the corresponding OPUC. For continuous OPUCn, "one or more OPUCs" means "one or more OPUCs", and the second indication information is used to indicate the timeslot occupation of all OPUCs in the corresponding way.

In this optional method, by including the second indication information in OPUC, the device receiving OPUCn can determine the occupancy of the time slot in OPUC in OPUCn, so as to extract service data.

In the following, continuous OPUCn is taken as an example to describe the first indication information and the second indication information by way of example.

Wherein, the first indication information and the second indication information may both be placed in a payload structure indicator (payload structure identifier) (PSI) overhead position. The bytes carrying the PSI in each OPUC are located in row 4 and column 15 in OPUC (see Figure 6). 256 OPUCs in one OPUC carry a complete PSI information. The first indication information may occupy one or more of the 256 bytes. The second indication information may include M sub-indication information, where the m-th sub-instruction information is used to indicate the occupancy of the m-th time slot in all OPUCs in one OPUC. One sub-indication message can occupy one or more of the 256 bytes. Among them, M is the total number of time slots included in each OPUC in the OPUC of the channel.

Exemplarily, referring to FIG. 7, the bytes of the 256 OPUCs carrying the PSI in the 256 OPUCs in the second OPUC (that is, the OPUC composed of OPUC # 2 of the n OPUCs on the right in FIG. 7) are the 256 words shown on the left Section, these 256 bytes may contain first indication information for indicating a timeslot multiplexing structure used by the second OPUC and second indication information for indicating the occupation of a time slot of the second OPUC.

The first instruction information and the second instruction information are exemplarily described below by taking the second channel OPUC and the third channel OPUC in FIG. 7 as examples.

(1) First instruction information

The first indication information may be recorded as PTsub. By way of example (recorded as Example 1), the PTsub included in the second OPUC and the third OPUC may be located in PSI [1]. When the value of the PTsub included in the second OPUC is 0x23, the PTsub indicates that the time slot multiplexing structure used by all OPUCs in the second OPUC is 80 * 1.25G time slots. The value of the PTsub included in the third OPUC may be 0x24, and the time slot multiplexing structure corresponding to the PTsub is 4 * 25G time slots. The PTsub indicates that the time slot multiplexing structure used by all OPUCs in the third OPUC is 4 *. 25G time slot. Among them, PSI [r] refers to the r-th byte of 256 bytes, where r is an integer greater than or equal to 0 and less than or equal to 255.

(2) Second instruction information

The second indication information may be a multiplex structure identifier (MSI).

In one example, each sub-indication information in the second indication information may occupy 1 byte out of 256 bytes. For example, in the second OPUC, 80 bytes of PSI [2] to PSI [81] in FIG. 7 can be used as the MSI overhead to indicate TS # 1 to TS in the second OPUC, respectively. Occupancy of # 80. Specifically, FIG. 8 shows the occupation of a TS. Among them, 1 bit in each byte is used to indicate whether the corresponding time slot is occupied (Occupation), and the remaining 7 bits are used to indicate the service identifier occupying the time slot. For example, the remaining 7 bits are The information may specifically be a tributary port identifier (TPID).

In another example, each sub-indication information in the second indication information may occupy 2 bytes. For example, in the second OPUC, 160 bytes of PSI [2] to PSI [161] may also be used as the MSI overhead, and each 2 bytes are used to indicate a time slot in the second OPUC Occupancy. Specifically, FIG. 9 shows the occupation of a TS. One bit in two bytes is used to indicate whether the corresponding time slot is available. One bit is used to indicate whether the corresponding time slot is occupied. The rest The 14 bits are used to indicate the service identifier occupying the time slot. For example, the information placed in the remaining 14 bits may specifically be a TPID.

Similarly, for OPUC # 3, that is, in the third OPUC, 8 bytes of 256 bytes can be used as the MSI overhead, and every 2 bytes are used to indicate the time slot of the third OPUC Occupancy. For example, PSI [2] and PSI [3] are used to indicate the occupation of TS # 1 in the third OPUC, and PSI [12] and PSI [13] are used to indicate the TS # 2 in the third OPUC. Occupancy, PSI [22] and PSI [23] are used to indicate the occupancy of TS # 3 in the third OPUC, PSI [32] and PSI [33] are used to indicate the TS # 4 in the third OPUC Occupancy. For the indication method, refer to FIG. 9 and related descriptions, and details are not described herein again.

Optionally, OPUCs belonging to the same type share a multiframe indication. In general, at least one OPUC among all the OPUCs of each OPUC contains a multiplexing indication. The multi-frame indicator may be an OPU multi-frame identifier (OMFI), which may be located in the 4th row and 16th column of the OPUC (see FIG. 6).

It should be noted that, in the embodiments of the present application, the timeslot multiplexing structure of multiple OPUCs may be the same. In this case, multiple OPUCs belonging to the same OPUC may share a multiframe indication. Exemplarily, when the three-way OPUC composed of OPUC # 2, OPUC # 20, and OPUC # 25 has the same time slot multiplexing structure, the three OPUCs can share the multi-frame indication included in the OPUC. If the 80-frame multi-frame of OPUC includes 80

OPUC #

2, 80 OPUC # 2 (denoted as OPUC # 2 ₁ to OPUC # 2 ₈₀ ) are one of the three OPUCs. Referring to FIG. 10, the value of OMFI contained in 80 OPUC # 2 in the OPUC of the channel ranges from 0 to 79, and each frame is incremented by 1 in turn. Then, the three OPUCs can share the multiframe indication included in the OPUC of the channel.

Multiple multi-channel OPUCs of the same type of OPUC share a multi-frame indication. Compared with the multi-frame indication included in each OPUC, the amount of information carried in OPUCn can be reduced. In addition, the receiving end resolves multiple OPUCs by processing a multi-frame indication, which can reduce the processing complexity of the receiving end.

Each OPUC in the n OPUCs may also include adjustment control (JC) 1 to JC6, and JC1 to JC6 as general mapping procedures (generic mapping procedures, GMP) mapping overhead, used to place mapping services to OPUC. Cm and CnD information generated by the slot, where Cm represents the number of service bytes or multibytes in the mapped time slot, and CnD represents the clock information of the service.

The OPUCn provided in the embodiment of the present application can be used for intra-domain links (for example, the link between N1 and N2 shown in FIG. 1), and can also be used for inter-domain links (for example, N3 and N6 shown in FIG. 1). Link).

With reference to the above description of the newly defined OPUCn with mixed slot granularity, the technical solution provided by the present application is further described below in combination with more drawings.

The embodiments of the present application provide a data transmission method, device, and system in an optical transmission network. The OPUCn in the method may be any one of the OPUCn provided in the foregoing embodiments. As shown in Figure 11, it includes:

1101. The transmitting end maps service data to OPUCn. OPUCn is composed of n OPUCs. The n OPUCs include multiple OPUCs. The time slot rates of any two types of OPUCs in multiple OPUCs are different. N is greater than 1. Integer.

The sending end and the receiving end in the embodiments of the present application may be OTN equipment. Specifically, the transmitting end and the receiving end may be OTN devices in the same domain, or may be OTN devices in different domains.

Among them, the service data can be ODU, for example: ODU0, ODU1, ODU2, ODU2e (dedicated ODU frames used to carry 10 Gigabit Ethernet (10GE) services), ODU3, ODU4, ODUflex, or directly customers Business data. For example: Ethernet services, common public radio interface (CPRI) services, enhanced common public radio interface (eCPRI) services, fiber channel (FC) services, and dedicated line services.

Optionally, the multiple OPUCs include at least two of the following three types of OPUCs: OPUCs containing 80 * 1.25G time slots (that is, the first OPUC), and OPUCs containing 20 * 5G time slots (that is, the second OPUC). OPUC), which contains 4 * 25G timeslots (that is, the third OPUC). For related descriptions of the optional method, refer to the foregoing, and details are not described herein again.

Optionally, the multiple OPUCs include an OPUC including 80 time slots with a timeslot rate of 1.25G, and an OPUC including 80 time slots with a timeslot rate of 1.25G is obtained by increasing the rate of the OPU4 frame. For related descriptions of the optional method, refer to the foregoing, and details are not described herein again.

Optionally, step 1101 specifically includes: 11) the sender determines the OPUC type corresponding to the service data; 12) the sender maps the service data to one or more OPUCs belonging to the type of OPUC corresponding to the service data.

It should be noted that there may be one or more types of OPU instance frames corresponding to one-way service data. The mapping method adopted by the transmitting end may be GMP. One channel of service data can be mapped into the corresponding type of OPU instance frame.

Optionally, step 11) in specific implementation includes: when the sending end determines that the bit rate of the service data is an integer multiple of the slot rate of the time slot included in one or more OPUCs, determining the one or more OPUC is the type of OPUC corresponding to service data. By mapping the service data to one or more OPUCs of the corresponding OPUC type, bandwidth waste can be avoided.

Exemplarily, when the bit rate of ODUflex1 is 2.5G, since 2.5G is twice the slot rate of 1.25G of the time slot included in the OPUC in the first OPUC, the sender can determine the OPUC corresponding to ODUflex1. The type is the first OPUC, or 2.5G is twice the slot rate of 2.5G of the time slot included in the OPUC in the fourth type of OPUC. Therefore, the transmitting end may also determine that the type of the OPUC corresponding to ODUflex1 is the first. Four OPUCs.

In addition, the transmitting end may also determine the number of occupied time slots according to the bit rate of the service data and the type of the corresponding OPUC. Based on the previous example, when the type of OPUC corresponding to ODUflex1 is the first OPUC, the sender can also determine that the number of timeslots occupied by service data is 2. When the type of OPUC corresponding to ODUflex1 is the fourth OPUC, send The end may also determine that the number of time slots occupied by the service data is one.

For step 12), taking OP1n including n1 first OPUCs (denoted as OPUCn1) and n2 second OPUCs (denoted as OPUCn2) as examples, the implementation process of step 12) is exemplarily described.

Referring to FIG. 12, when the bit rate of ODUflex1 to ODUflexi is 2.5G, the transmitting end can map ODUflex1 to ODUflexi to two time slots in OPUCn1 respectively. When the bit rate of ODUflex (i + 1) to ODUflexj is 5G , The transmitting end can map ODUflex (i + 1) to ODUflexj to 1 slot in OPUCn2 respectively.

When OPUCn also includes n3 third OPUCs (referred to as OPUCn3), see FIG. 13. If the bit rate of ODUflex (j + 1) to ODUflexk is 25G, the sender can also change ODUflex (j + 1) to ODUflexk is mapped into one slot in OPUCn3.

It should be noted that an ODUflex can be mapped to one or more OPUCs.

Optionally, step 12) specifically includes: 21) the sender adds the mapping overhead of the service data to the ODTU of one or more OPUCs belonging to the type of OPUC corresponding to the service data, and multiplexes the ODTU to one or more OPUCs in. Among them, ODTU is an intermediate frame formed by one or more time slots of OPUC.

Specifically, the service data may be mapped to an ODTU composed of multiple time slots in an OPUC belonging to the type of OPUC corresponding to the service data, and the ODTU may be multiplexed into the OPUC, or may be mapped to the corresponding data belonging to the service data. The ODTU composed of multiple time slots in multiple OPUCs of the OPUC type is multiplexed into the multiple OPUCs.

Exemplarily, based on the example shown in FIG. 12, the transmitting end may add mapping overhead from ODUflex1 to ODUflexi to an ODTU composed of one or more time slots of OPUCn1, and multiplex the ODTU into OPUCn1. Add mapping overhead from ODUflex (i + 1) to ODUflexj to the ODTU composed of one or more time slots of OPUCn2, and then multiplex the ODTU into OPUCn2. The combination of OPUCn1 and OPUCn2 is OPUCn. In addition, the transmitting end may also directly multiplex the ODTU multiplexed to OPUCn1 and the ODTU multiplexed to OPUCn2 to obtain OPUCn.

1102. The sending end sends OPUCn to the receiving end. Accordingly, the receiving end receives OPUCn from the transmitting end.

Specifically, the transmitting end can add ODUOH to OPUCn to obtain ODUCn frames, and then add OTUOH to ODUCn frames to obtain OTUCn frames, and send OTUCn frames to the receiving end. In this case, the receiving end may receive the OTUCn frame from the transmitting end, and obtain the OPUCn from the OTUCn frame.

1103. The receiving end obtains service data from the time slots included in the n OPUCs.

In the method provided in the embodiment of the present application, OPUCn includes multiple OPUCs. In the process of mapping service data to one OPUCn, the transmitting end may select an appropriate OPUC for mapping according to the bit rate of the service data. For example, the bit rate is 1.25G Service data can be mapped into a 1.25G time slot of the first OPUC. On the one hand, this approach improves network bandwidth utilization. On the other hand, the business does not need to go through multiple levels of mapping, reducing the mapping complexity.

Optionally, step 1103 in specific implementation includes: 31) the receiving end determines the first information, the first information is the number of timeslots and timeslot rate contained in the n OPUCs; 32) the receiving end determines the second information, the second information Time slot occupation of the time slots included in the n OPUCs; 33) the receiving end determines the third information, and the third information is a multiframe indication of the n OPUCs; 34) the receiving end according to the first information, the second information, and the third information The information is demultiplexed to OPUCn to obtain an ODTU; 35) The receiving end demaps service data from the ODTU.

Optionally, one or more OPUCs in the n OPUCs include first indication information, and the first indication information is used to indicate a timeslot multiplexing structure adopted by the corresponding OPUC. For related descriptions of the optional method, refer to the foregoing, and details are not described herein again.

Based on this optional method, step 31) in specific implementation may include: the receiving end determines the first information according to the first indication information included in one or more OPUCs of the n OPUCs.

Exemplarily, based on Example 1, the receiving end may determine the time slot multiplexing structure of the n OPUCs according to the PSI carried by the n OPUCs in the identified OPUCn. Specifically, when the receiving end recognizes that PTsub = 0x23 carried by one OPUC, it is determined that the time slot multiplexing structure adopted by each OPUC in the OPUC is 80 * 1.25 time slots. When the receiving end recognizes that PTsub = 0x24 carried by one OPUC, it is determined that the time slot multiplexing structure adopted by each OPUC in the OPUC is 4 * 25 time slots.

Optionally, each of the n OPUCs includes second indication information, and the information is used to indicate a slot occupation situation of the corresponding OPUC. For related descriptions of the optional method, refer to the foregoing, and details are not described herein again.

Based on the optional method, step 32) in specific implementation may include: the receiving end determines the second information according to the second instruction information included in each OPUC of the n OPUCs.

Specifically, the receiving end may determine whether the time slot in the OPUC is occupied and which service is occupied according to the acquired MSI carried in the OPUC.

Optionally, the OPUCs belonging to the same type among the n OPUCs share a multiframe indication. For related descriptions of the optional method, refer to the foregoing, and details are not described herein again.

Based on this optional method, step 33) in specific implementation may include: the receiving end determines the third information according to the multiframe indication included in at least one OPUC of the n OPUCs.

Based on this optional method, when the timeslot multiplexing structure of multiple OPUCs is the same, the receiving end may determine that the timeslot multiplexing structure of the multiple OPUCs is the same according to the first instruction information, and then according to one of the multiple ways The multi-frame indication included in the OPUC determines the multi-frame indication of the multi-channel OPUC. The receiving end can determine which OPUC is a multiframe according to the multiframe instruction, thereby demultiplexing OPUC into multiple ODTUs, extracting mapping overhead information (that is, the aforementioned Cm and CnD information) from multiple ODTUs, and demapping each service. .

An embodiment of the present application further provides an OPUCn, including: n OPUCs, each OPUC of the n OPUCs includes an 80 * 1.25G time slot, and n is an integer greater than 1.

Optionally, OPUC is obtained by increasing the rate of the OPU4 frame. For a description of the rate improvement of the OPU4 frame, refer to the description of the relevant part above, and will not be repeated here.

Exemplarily, referring to FIG. 14, FIG. 14 illustrates a division manner of n OPUCs in this OPUCn, where a payload area of each OPUC in this OPUCn is divided into 80 * 1.25G time slots.

In this case, referring to FIG. 15, the sending end may add mapping overhead from ODUflex1 to ODUflexk to ODTUCn.ts in OPUCn (that is, an ODTU consisting of ts 1.25G time slots in OPUCn), and multiplex multiple ODTUCn.ts. Use OPUCn. Among them, one ODUflex may be mapped to one or more OPUCs. For example, referring to FIG. 15, ODUflexi may add a mapping overhead to the first and last OPUCs in OPUCn. The mapping method may be GMP.

The n OPUCs in the OPUCn provided in the embodiments of the present application all include 80 * 1.25G time slots. Because the granularity of time slot division is small, the bit rate is 1.25G compared to the OPUCn with 5G time slot division granularity. The service data can be mapped to a 1.25G time slot in the OPUCn provided in the embodiment of the present application, and need not be mapped to a 5G time slot, which can improve bandwidth utilization.

FIG. 16 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may be a transmitting end or a receiving end in the above embodiments. 16, the communication device 160 includes a processing unit 1601 and a communication unit 1602, and may further include a storage unit 1603. The communication unit 1602 may include a transmitting unit and a receiving unit. It should be noted that the sending unit or the receiving unit may be an optional unit.

When the communication device 160 is the transmitting end in the foregoing embodiment, the processing unit 1601 is configured to perform step 1101 in FIG. 11, and the communication unit 1602 is configured to perform step 1102 in FIG. 11. Referring to FIG. 17, the processing unit 1601 may include a mapping unit, step 1101 in FIG. 11 may be specifically performed by the mapping unit, and step 1102 in FIG. 11 may be specifically performed by a sending unit in the communication unit 1602.

When the communication device 160 is the receiving end in the foregoing embodiment, the processing unit 1601 is configured to perform step 1103 in FIG. 11, and the communication unit 1602 is configured to perform step 1102 in FIG. 11. Referring to FIG. 18, the processing unit 1601 may include an obtaining unit, step 1103 in FIG. 11 may be specifically performed by the obtaining unit, and step 1102 in FIG. 11 may be specifically performed by a receiving unit in the communication unit 1602.

It should be noted that the actions performed by the respective units are only specific examples. For the actions actually performed by the respective units, refer to the actions or steps mentioned in the foregoing description based on the embodiment described in FIG. 11. It should also be noted that each unit may be located in a circuit board in the OTN hardware structure diagram shown in FIG. 2. This application does not place any restrictions on the location of the board where each unit is located.

It should also be noted that the above-mentioned processing unit, sending unit, receiving unit, and communication unit may also be replaced with a processor, a transmitter, a receiver, and a communication interface (or transceiver). It should also be noted that the transmitting unit may be an optical module having only a transmitting function or having two functions of transmitting and receiving, and the receiving unit may be an optical module having only a receiving function or having both functions of transmitting and receiving.

An embodiment of the present application further provides a chip, in which a circuit and one or more interfaces for implementing the functions of the processor are integrated. When a memory is integrated in the chip, the chip is connected to the optical module through the interface, so that the optical module is used to send the OPUCn mentioned in the above method embodiment to other communication devices, or to receive frames sent by other communication devices from the optical module. ; When no memory is integrated in the chip, it can be connected to the external memory through this interface, and the chip implements the internal execution of the communication device (sending or receiving end) in the above embodiment according to the program code stored in the external memory. And send and receive OPUCn by connecting the optical module to it. Optionally, the functions supported by the chip may include processing actions based on the sending end or the receiving end in the embodiment described in FIG. 11, and details are not described herein again.

A person of ordinary skill in the art may understand that all or part of the steps of implementing the foregoing embodiments may be implemented by hardware, or may be instructed by a program to complete related hardware. The program may be stored in a computer-readable storage medium. The mentioned storage medium may be a read-only memory, a random access memory, and the like. Specifically, for example, the processing unit or processor may be a central processing unit, a general-purpose processor, an application-specific integrated circuit (ASIC), a microprocessor (digital processing processor, DSP), or a field programmable gate array (DSP). field programmable array (FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. Whether these functions are performed by hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods for each specific application.

An embodiment of the present application further provides a computer storage medium, including: computer instructions that, when the computer instructions run on the computer, cause the computer to execute any one of the methods in the foregoing embodiments.

An embodiment of the present application further provides a computer program product containing instructions, and when the instructions are run on a computer, the computer is caused to execute any one of the methods in the foregoing embodiments. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are wholly or partially generated. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server, or data center via a wired (for example, Coaxial cable, optical fiber, digital subscriber line (DSL), or wireless (such as infrared, wireless, microwave, etc.) to transmit to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, and the like that can be integrated with the medium. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), or the like.

Although the present application is described in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and realize the disclosure by looking at the drawings, the disclosure, and the appended claims. Other variations of the embodiment. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude the case of a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

Although the present application has been described with reference to specific features and embodiments thereof, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the application as defined by the appended claims, and are deemed to have covered any and all modifications, changes, combinations, or equivalents that fall within the scope of the application.

Claims

A data transmission method in an optical transmission network, comprising:

The transmitting end maps the service data to an optical payload unit Cn (OPUCn) frame, the OPUCn frame is composed of n optical payload unit C (OPUC) instance frames, and the n OPUC instance frames include multiple OPUC instance frames , Any two kinds of OPUC instance frames of the two kinds of OPUC instance frames have different timeslot rates, and n is an integer greater than 1;

The sending end sends the OPUCn frame to the receiving end.
The method according to claim 1, wherein the sending end mapping the service data into an OPUCn frame comprises:

The sending end determines a type of an OPUC instance frame corresponding to the service data;

The sending end maps the service data to one or more OPUC instance frames belonging to a type of an OPUC instance frame corresponding to the service data.
The method according to claim 2, wherein the sending end mapping the service data to one or more OPUC instance frames belonging to a type of an OPUC instance frame corresponding to the service data, comprising:

The sending end adds mapping overhead of the service data to an optical data branch unit ODTU of one or more OPUC instance frames belonging to a type of an OPUC instance frame corresponding to the service data, and multiplexes the ODTU to The one or more OPUC instance frames.
The method according to any one of claims 1-3, wherein the multiple OPUC instance frames include at least two of the following three OPUC instance frames:

OPUC instance frames containing 80 timeslots with a slot rate of 1.25 Gbit / s (s), OPUC instance frames containing 20 timeslots with a slot rate of 5Gbit / s, including 4 timeslot rates OPUC instance frame for 25Gbit / s time slot.
The method according to any one of claims 1-4, wherein one or more OPUC instance frames in the n OPUC instance frames include first indication information, and the first indication information is used to indicate Slot multiplexing structure used by the corresponding OPUC instance frame.
The method according to any one of claims 1 to 5, wherein the multiple OPUC instance frames include an OPUC instance frame including 80 time slots with a time slot rate of 1.25 Gbit / s, and the 80 An OPUC instance frame with a slot rate of 1.25 Gbit / s is obtained by increasing the rate of the OPU4 frame.
A data transmission device in an optical transmission network, comprising: a communication unit and a processing unit;

The processing unit is configured to map service data to an optical payload unit Cn (OPUCn) frame, the OPUCn frame is composed of n optical payload unit C (OPUC) instance frames, and the n OPUC instance frames include A plurality of OPUC instance frames, and any two types of OPUC instance frames in the two kinds of OPUC instance frames have different timeslot rates, and n is an integer greater than 1.

The communication unit is configured to send the OPUCn frame to the receiving end.
The apparatus according to claim 7, wherein the processing unit is specifically configured to:

Determining the type of the OPUC instance frame corresponding to the service data;

And mapping the service data into one or more OPUC instance frames belonging to a type of an OPUC instance frame corresponding to the service data.
The apparatus according to claim 8, wherein the processing unit is specifically configured to:

Adding a mapping overhead to the service data to an optical data branch unit ODTU of one or more OPUC instance frames belonging to a type of an OPUC instance frame corresponding to the service data, and multiplexing the ODTU to the one or more Multiple OPUC instance frames.
The apparatus according to any one of claims 7-9, wherein the multiple OPUC instance frames include at least two OPUC instance frames among the following three OPUC instance frames: containing 80 time slots with a rate of 1.25 An OPUC instance frame with a Gbit / s (s) time slot, including 20 OPUC instance frames with a time slot rate of 5 Gbit / s, including 4 time slots with a rate of 25 Gbit / s OPUC instance frame.
The apparatus according to any one of claims 7 to 10, wherein one or more OPUC instance frames in the n OPUC instance frames include first indication information, and the first indication information is used to indicate Slot multiplexing structure used by the corresponding OPUC instance frame.
The apparatus according to any one of claims 7 to 11, wherein the multiple OPUC instance frames include an OPUC instance frame including 80 time slots with a timeslot rate of 1.25 Gbit / s, and the 80 An OPUC instance frame with a slot rate of 1.25 Gbit / s is obtained by increasing the rate of the OPU4 frame.
A data transmission device in an optical transmission network, comprising: a communication unit and a processing unit;

The communication unit is configured to receive an optical payload unit Cn (OPUCn) frame from a transmitting end. The OPUCn frame is composed of n optical payload unit C (OPUC) instance frames. The n OPUC instance frames include multiple types. OPUC instance frames, any two kinds of OPUC instance frames of the two kinds of OPUC instance frames have different timeslot rates, and n is an integer greater than 1.

The processing unit is configured to obtain service data from a time slot included in the n OPUC instance frames.
The apparatus according to claim 13, wherein the processing unit is specifically configured to:

Determine first information, where the first information is a number of timeslots and a timeslot rate included in the n OPUC instance frames;

Determining second information, where the second information is a time slot occupation situation of time slots included in the n OPUC instance frames;

Determining third information, where the third information is a multi-frame indication of the n OPUC instance frames;

Demultiplexing the OPUCn frame according to the first information, the second information, and the third information to obtain an optical data branch unit ODTU;

De-mapping the service data from the ODTU.
The apparatus according to claim 14, wherein one or more OPUC instance frames in the n OPUC instance frames include first indication information, and the first indication information is used to indicate a corresponding OPUC instance frame. The used time slot multiplexing structure, and the processing unit are specifically configured to:

The first information is determined according to first indication information contained in one or more OPUC instance frames in the n OPUC instance frames.
The device according to any one of claims 13-15, wherein the multiple OPUC instance frames include at least two OPUC instance frames among the following three OPUC instance frames: including 80 time slots with a rate of 1.25 An OPUC instance frame with a Gbit / s (s) time slot, including 20 OPUC instance frames with a time slot rate of 5 Gbit / s, including 4 time slots with a rate of 25 Gbit / s OPUC instance frame.
The device according to any one of claims 13 to 16, wherein the multiple OPUC instance frames include an OPUC instance frame including 80 time slots with a time slot rate of 1.25 Gbit / s, and the 80 An OPUC instance frame with a slot rate of 1.25 Gbit / s is obtained by increasing the rate of the OPU4 frame.
A data transmission device in an optical transmission network, comprising: a memory and a processor, the memory and the processor are connected by a communication bus, the memory is used to store instructions, and the processor executes the processor Instructions to cause the apparatus to implement the method according to any one of claims 1 to 6.
An optical payload unit Cn (OPUCn) frame is characterized in that it includes:

n optical payload unit C (OPUC) instance frames, the n OPUC instance frames include a plurality of OPUC instance frames, and a time slot rate of a time slot included in any two of the plurality of OPUC instance frames Different, n is an integer greater than 1.
The OPUCn frame according to claim 19, wherein the multiple OPUC instance frames include at least two of the following three OPUC instance frames:

OPUC instance frame containing 80 timeslots with a slot rate of 1.25 Gbit / s (s), OPUC instance frames containing 20 timeslots with a slot rate of 5Gbit / s and 4 timeslot rates OPUC instance frame for 25Gbit / s time slot.
The OPUCn frame according to claim 19 or 20, wherein one or more OPUC instance frames in the n OPUC instance frames include first indication information, and the first indication information is used to indicate a corresponding Slot multiplexing structure used by OPUC instance frames.
The OPUCn frame according to any one of claims 19 to 21, wherein each of the n OPUC instance frames includes second indication information, and the second indication information is used to indicate a corresponding OPUC instance frame timeslot occupancy.
The OPUCn frame according to any one of claims 19 to 22, wherein the multiple OPUC instance frames include an OPUC instance frame including 80 time slots with a time slot rate of 1.25 Gbit / s, and the containing The OPUC instance frames of 80 timeslots with a timeslot rate of 1.25 Gbit / s are obtained by increasing the rate of the OPU4 frames.
The OPUCn frame according to any one of claims 19 to 23, wherein the OPUC instance frames belonging to the same type among the n OPUC instance frames share a multiframe indication.