WO2016045426A1 - 光传输网的业务映射处理方法、装置及系统 - Google Patents

光传输网的业务映射处理方法、装置及系统 Download PDF

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Publication number
WO2016045426A1
WO2016045426A1 PCT/CN2015/082675 CN2015082675W WO2016045426A1 WO 2016045426 A1 WO2016045426 A1 WO 2016045426A1 CN 2015082675 W CN2015082675 W CN 2015082675W WO 2016045426 A1 WO2016045426 A1 WO 2016045426A1
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Prior art keywords
odu
mapping
odtucn
indication information
granularity
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PCT/CN2015/082675
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English (en)
French (fr)
Inventor
苏伟
维塞斯马腾
吴秋游
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华为技术有限公司
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Priority to KR1020177010726A priority Critical patent/KR102056093B1/ko
Priority to BR112017005848-0A priority patent/BR112017005848B1/pt
Priority to JP2017515795A priority patent/JP6446540B2/ja
Priority to ES15844604T priority patent/ES2744314T3/es
Priority to EP15844604.7A priority patent/EP3188386B1/en
Publication of WO2016045426A1 publication Critical patent/WO2016045426A1/zh
Priority to US15/465,299 priority patent/US10680733B2/en
Priority to US16/895,841 priority patent/US11483088B2/en
Priority to US17/951,937 priority patent/US11949501B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a service mapping processing method, apparatus, and system for an optical transmission network.
  • the optical transport network (OTN) technology is the core technology of the next-generation transport network, including the technical specifications of the electrical layer and the optical layer.
  • the International Telecommunications Union Telecommunication Standardization Organization (referred to as ITU-T) has a structure in which the OTN is 4 ⁇ 4080.
  • IP Internet Protocol
  • the OTN-corresponding layer technology also needs to provide a matched variable rate OTN.
  • ITU-T is discussing the development of a new optical channel transport unit (OTU) Cn with a rate of 100 Mbps.
  • the bit rate of the OTUCn is n times the reference rate, and the reference rate is preferably 100 Gbit. /s, n is variable, and C is a Roman numeral of 100.
  • GMP Generic Mapping Procedure
  • LO Low Order
  • ODU Optical Channel Data Unit
  • the mapping granularity is fixed.
  • this method uses a fixed mapping granularity and is not flexible enough to cause the problem that the OTUCn carrying the same LO ODU but using different mapping granularities cannot communicate with each other at the transmitting and receiving ends.
  • the embodiment of the invention provides a method, a device and a system for processing a service mapping of an optical transmission network, so as to solve the problem that the OTUCn with different mapping granularity cannot communicate with each other at the transmitting and receiving ends.
  • an embodiment of the present invention provides a service mapping processing method for an optical transmission network, where include:
  • mapping adaptation indication information according to a mapping granularity of the low-order optical channel data unit LO ODU to be carried, where the mapping granularity is M ⁇ g bytes, where M is the to-be-beared LO ODU in the optical channel payload unit OPUCn
  • the number of occupied slots, g is the mapping granularity corresponding to each slot in the slot occupied by the LO ODU, and g is a positive integer greater than one;
  • the mapping adaptation indication information includes: a mapping adaptation type, where the mapping adaptation type is used to indicate when the LO ODU is occupied The mapping granularity g corresponding to each time slot in the slot.
  • the mapping, the indication information further includes: carrying the LO ODU to be carried in the ODTUCn The number of data entities Cm in the .M and the clock information C nD of the LO ODU to be carried, the size of the data entity being M ⁇ g bytes.
  • mapping mapping indication information include:
  • the method further includes:
  • mapping granularity of the another LO ODU being M 1 ⁇ g 1 byte, where M 1 is the another LO ODU
  • M 1 is the another LO ODU
  • g 1 is a mapping granularity corresponding to each time slot in the time slot occupied by the other LO ODU
  • g 1 is a positive integer greater than 1, where g 1 is not equal to g;
  • the ODTUCn.M 1 is packaged to the OTUCn.
  • mapping granularity is transmitted by the network management system NMS or Software defined network T-SDN controller configuration.
  • an embodiment of the present invention provides a service mapping processing method of an optical transmission network, including:
  • ODTUCn.M an optical channel data tributary unit ODTUCn.M from the OTUCn, where the ODTUCn.M includes an ODTUCn.M overhead area and an ODTUCn.M payload area;
  • mapping granularity is M ⁇ g bytes, where M is the to-be-beared LO ODU in the light
  • the number of time slots occupied by the channel payload unit OPUCn, g is the mapping granularity corresponding to each time slot in the time slot occupied by the LO ODU, and g is a positive integer greater than one;
  • the mapping adaptation indication information includes: a mapping adaptation type, where the mapping adaptation type is used to indicate when the LO ODU is occupied The mapping granularity g corresponding to each time slot in the slot.
  • the mapping, the indication information the method further includes: carrying the LO ODU to be carried in the ODTUCn The number of data entities Cm in the .M and the clock information C nD of the LO ODU to be carried, the size of the data entity being M ⁇ g bytes.
  • mapping, the mapping indication information, and the payload structure indication carried in the ODTUCn. PSI determine the mapping granularity, including:
  • mapping adaptation type in the mapping adaptation indication information Obtaining, according to the mapping adaptation type in the mapping adaptation indication information, a mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU;
  • the disassembling the ODTUCn.M according to the mapping adaptation indication information to obtain low-order light Channel data unit LO ODU including:
  • mapping adaptation indication information Parsing the mapping adaptation indication information to acquire the number C m of data entities carried in the ODTUCn.M and the clock information C nD of the LO ODU in the LO ODU to be demapped in the ODTUCn.M;
  • the granularity of the mapping, the number of data C m of the LO ODU entities in the carrier and a preset ODTUCn.M demap the mapping algorithm from the LO ODU in the ODTUCn.M;
  • the clock information of the LO ODU is recovered according to the number of bytes of the LO ODU transmitted during one ODTUCn.M period.
  • an embodiment of the present invention provides a sending end device, including:
  • the indication information generating module is configured to generate mapping adaptation indication information according to a mapping granularity of the low-order optical channel data unit LO ODU to be carried, where the mapping granularity is M ⁇ g bytes, where M is the LO ODU to be carried.
  • the number of time slots occupied by the optical channel payload unit OPUCn, g is the mapping granularity corresponding to each time slot in the time slot occupied by the LO ODU, and g is a positive integer greater than one;
  • mapping module configured to map the to-be-beared LO ODU to an ODTUCn.M payload area in the optical channel data tributary unit ODTUCn.M according to the mapping adaptation indication information, where the ODTUCn.M includes an ODTUCn.M overhead Zone and the ODTUCn.M payload area;
  • a packaging module configured to encapsulate the mapping adaptation indication information into the ODTUCn.M overhead area; and encapsulate the ODTUCn.M into an optical channel transmission unit OTUCn;
  • a sending module configured to send the OTUCn to the receiving device.
  • the mapping adaptation indication information includes: a mapping adaptation type, where the mapping adaptation type is used to indicate when the LO ODU is occupied The mapping granularity g corresponding to each time slot in the slot.
  • the mapping, the indication information further includes: carrying the LO ODU to be carried in the ODTUCn The number of data entities Cm in the .M and the clock information C nD of the LO ODU to be carried, the size of the data entity being M ⁇ g bytes.
  • the indication information generating module is configured to be used in the OPUCn according to the to-be-beared LO ODU
  • the number of time slots M, the mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU, and the number of bytes of the LO ODU to be carried in an ODTUCn.M period are calculated and obtained.
  • C m is the number of data entities carried in the ODTUCn.M be carried in the LO ODU; LO ODU in accordance with the carrier to be occupied by the number of slots in OPUCn m, the LO ODU slot occupied by each of The clock size g corresponding to the time slot and the number of bytes of the LO ODU to be carried in an ODTUCn.M period are calculated to obtain the clock information C nD of the LO ODU to be carried.
  • the indication information generating module is further configured to The mapping granularity of another LO ODU to be carried generates another mapping adaptation indication information
  • the mapping granularity of the other LO ODU is M 1 ⁇ g 1 byte, where M 1 is the other LO ODU in the The number of time slots occupied in the OPUCn, g 1 is the mapping granularity corresponding to each time slot in the time slot occupied by the other LO ODU, and g 1 is a positive integer greater than 1, where g 1 is not equal to g ;
  • the mapping module is further adapted for mapping, according to the indication information further to the other LO ODU ODTUCn.M 1 mapped to the payload area, the ODTUCn.M 1 ODTUCn.M 1 comprises an overhead area and ODTUCn .M 1 payload area;
  • the encapsulation module is further adapted for mapping the indication information further encapsulated into the overhead area ODTUCn.M 1; ODTUCn.M 1 the package to the OTUCn.
  • mapping granularity is transmitted by the network management system NMS or Software defined network T-SDN controller configuration.
  • an embodiment of the present invention provides a receiving end device, including:
  • a receiving module configured to receive an optical channel transmission unit OTUCn sent by the sending end device
  • An obtaining module configured to obtain an optical channel data tributary unit ODTUCn.M from the OTUCn, where the ODTUCn.M includes an ODTUCn.M overhead area and an ODTUCn.M payload area;
  • a determining module configured to determine a mapping granularity according to the acquiring mapping adaptation indication information and the payload structure indicating PSI carried in the ODTUCn.M overhead area, where the mapping granularity is M ⁇ g bytes, where M is the The number of time slots occupied by the LO ODU in the optical channel payload unit OPUCn, g is the mapping granularity corresponding to each time slot in the time slot occupied by the LO ODU, and g is a positive integer greater than one;
  • a demapping module configured to perform demapping on the ODTUCn.M according to the mapping adaptation indication information to obtain a low-order optical channel data unit LO ODU.
  • the mapping adaptation indication information includes: a mapping adaptation type, where the mapping adaptation type is used to indicate when the LO ODU is occupied The mapping granularity g corresponding to each time slot in the slot.
  • the mapping, the indication information further includes: carrying the LO ODU to be carried in the ODTUCn The number of data entities Cm in the .M and the clock information C nD of the LO ODU to be carried, the size of the data entity being M ⁇ g bytes.
  • the determining module is configured to acquire, by using the mapping adaptation indication information, the LO ODU
  • the mapping granularity g corresponding to each time slot in the time slot; the number M of time slots occupied by the LO ODU to be carried in the OPUCn is obtained according to the PSI.
  • the demapping module is configured to parse the mapping adaptation indication information to obtain the ODTUCn.M
  • C m and the number of clock information of the LO ODU C nD data computing entity acquires the number m of bytes in the transmit LO ODU in a ODTUCn.M period; transmitting the ODTUCn.M within a period according to the The number of bytes of the LO ODU recovers the clock information of the LO ODU.
  • an embodiment of the present invention provides an optical transmission network, including: a transmitting end device and a receiving end device; and the transmitting end device adopting the third aspect, any one of the first to fifth aspects of the third aspect A device as described in a possible implementation, wherein the receiving device is the device according to any one of the first to fourth aspects of the fourth aspect.
  • the mapping of the LO ODU in the embodiment of the present invention refers to filling the signal of the LO ODU into the time slot occupied by the LO ODU. This mapping is not done at one time, and often requires multiple mappings to fill the LO ODU signal to be carried into the slot it occupies. In this multiple mapping process, the number of bytes of the LO ODU signal mapped in each mapping process is referred to as the mapping granularity of the LO ODU. Since one LO ODU signal may occupy multiple time slots, the number of bytes mapped into each occupied time slot in each mapping process is the same, and this is mapped into bytes in a single time slot during each mapping process. The number is called the mapping granularity corresponding to a single time slot in the time slot occupied by the LO ODU.
  • the service mapping processing method, device and system of the optical transmission network in the embodiment of the present invention determine the mapping granularity and generate mapping adaptation indication information according to the mapping granularity to instruct the receiving end device to perform corresponding demapping, thereby implementing LO ODU based on mapping granularity.
  • the mapping of ODTUCn.M solves the problem that the OTUCn carrying the same LO ODU but using different mapping granularities cannot communicate with each other at the transmitting and receiving ends when the existing fixed mapping granularity is solved.
  • FIG. 1 is a flowchart of an embodiment of a service mapping processing method of an optical transmission network according to the present invention
  • 2A is a schematic diagram of mapping LO ODU services of multiple mapping granularities to OTUCn;
  • 2B is another schematic diagram of mapping LO ODU services of multiple mapping granularities to OTUCn;
  • FIG. 3 is a schematic diagram of a frame structure of OTUCn
  • FIG. 4 is a schematic diagram of another frame structure of OTUCn
  • 5A-5C are schematic diagrams showing an OPUCn overhead area and an OPUCn payload area slot division
  • 6A is a schematic diagram of an OPUCn overhead area
  • 6B is a schematic diagram of a PSI byte structure
  • Figure 6C is a schematic diagram of the OMFI byte structure
  • FIG. 7 is a flowchart of another embodiment of a service mapping processing method of an optical transmission network according to the present invention.
  • Figure 8A is a schematic diagram of a structure of ODTUCn.M
  • Figure 8B is a schematic view showing another structure of ODTUCn.M.
  • 9A is a schematic diagram of a format of a TSOH
  • 9B is another schematic diagram of a format of TSOH
  • 9C is a schematic diagram of another format of TSOH.
  • FIG. 10 is a flowchart of still another embodiment of a service mapping processing method of an optical transmission network according to the present invention.
  • FIG. 11 is a flowchart of still another embodiment of a service mapping processing method of an optical transmission network according to the present invention.
  • FIG. 12 is a schematic structural diagram of an embodiment of a transmitting end device according to the present invention.
  • FIG. 13 is a schematic structural diagram of an embodiment of a receiving end device according to the present invention.
  • FIG. 14 is a schematic structural diagram of an embodiment of an optical transmission network according to the present invention.
  • FIG. 15 is a schematic diagram of a mapping process of the transmitting and receiving ends of the present invention.
  • 16 is a schematic diagram of a circuit structure of the transmitting and receiving ends of the optical transmission network under fast clock processing
  • FIG. 17 is a schematic diagram of a circuit structure of the transmitting and receiving ends of the optical transmission network under slow clock processing.
  • FIG. 1 is a flowchart of an embodiment of a service mapping processing method of an optical transmission network according to the present invention. As shown in FIG. 1 , the method in this embodiment may include:
  • Step 101 Generate mapping adaptation indication information according to a mapping granularity of the low-order optical channel data unit LO ODU to be carried, where the mapping granularity is M ⁇ g bytes, where M is the optical channel payload of the LO ODU to be carried.
  • the number of time slots occupied by the unit OPUCn, g is the mapping granularity corresponding to each time slot in the time slot occupied by the LO ODU, and g is a positive integer greater than one;
  • the execution body of this embodiment may be a sender device in the OTN.
  • the OTUCn being developed by ITU-T can represent a super 100 Gbit/s rate, the bit rate of the OTUCn is n times the reference rate, n is variable, and C is a Roman numeral of 100.
  • the LO ODU needs to be mapped to OTUCn.
  • the optimal mapping granularity of the current chip for the processing capacity of the OPUCn single time slot bandwidth is 4 bytes (C 32 ) or 8 bytes (C 64 ).
  • mapping adaptation indication information needs to be generated according to the mapping granularity of the LO ODU to be carried.
  • the mapping granularity is variable and can be changed from C 64 to C 32 according to actual conditions. , C 16, C 8 and the like to be carried OPUCn select a single slot size corresponding to the mapping g LO ODU occupied, the number M LO ODU carried further time slot occupied by the OPUCn selected according to the calculation determines a particle size of LO ODU mapping M ⁇ g bytes.
  • the mapping adaptation indication information is mainly mapping information used by the transmitting end device to indicate the LO ODU to the OTUCn to the receiving end device.
  • Step 102 Map the to-be-beared LO ODU to the ODTUCn.M payload area in the optical channel data tributary unit ODTUCn.M according to the mapping adaptation indication information, where ODTUCn.M includes an ODTUCn.M overhead area and the ODTUCn.M payload area;
  • the transmitting end device maps the LO ODU to be carried to the ODTUCn.M according to the mapping adaptation indication information, and the ODTUCn.M is composed of a partial time slot in the OPUCn and its time slot overhead, and the LO ODU data is carried in the ODTUCn.M.
  • the ODTUCn.M overhead area carries the mapping adaptation indication information
  • the ODTUCn.M payload area carries the LO ODU data.
  • the receiving end parses the mapping adaptation indication information carried in the ODTUCn.M overhead area, the OTDUCn.M net can be obtained.
  • the LO ODU data is demapped in the flood zone.
  • Step 103 Encapsulate the mapping adaptation indication information into the ODTUCn.M overhead area.
  • Step 104 packaging the ODTUCn.M to the optical channel transmission unit OTUCn;
  • ODTUCn.M is composed of some time slots in OPUCn and its time slot overhead
  • the transmitting device encapsulates ODTUCn.M into OPUCn
  • the ODTUCn.M is respectively encapsulated into the corresponding time slot of OPUCn, and then ODUCn is added.
  • Overhead, OTUCn overhead, and frame header indication form an OTUCn frame.
  • Step 105 Send the OTUCn to the receiving end device.
  • the sending end device sends the encapsulated OTUCn to the receiving end device, so that the LO ODU data is carried in the OTUCn, and since the mapping process is based on the variable mapping granularity, the receiving end device can receive the mapping adaptation indication according to the mapping after receiving the OTUCn.
  • the information may obtain the LO ODUs of the OPUCn to carry the LO ODU, thereby de-mapping the mapping, and the mapping granularity is also indicated in the mapping adaptation indication information, and the receiving end device may perform demapping in a manner corresponding to the mapping granularity. Therefore, the problem that the OTUCn that does not use the mapping granularity can not communicate with each other at the transmitting and receiving ends is avoided.
  • mapping of the LO ODU based on the mapping granularity to the ODTUCn.M is implemented, and the existing fixed mapping is solved.
  • the OTUCn carrying the same LO ODU but using different mapping granularities cannot communicate with each other at the transmitting and receiving ends.
  • the mapping adaptation indication information includes: a mapping adaptation type, where the mapping adaptation type is used to indicate a mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU.
  • mapping information indicating adaptation further comprising: the carrier to be carried LO ODU to the number C m ODTUCn.M of the data entity and clock information to be carried LO ODU C nD of the The size of the data entity is M x g bytes.
  • the specific implementation method may be: according to the number M of slots occupied by the LO ODU in the OPUCn, and the mapping granularity corresponding to each slot in the slot occupied by the LO ODU. g size and the number of bytes transferred in one cycle of the ODTUCn.M be calculated LO ODU carrier acquires the number C m carried in the data entity in the ODTUCn.M be carried LO ODU; and to be based on the Carrying the number M of time slots occupied by the LO ODU in the OPUCn, the mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU, and transmitting the LO ODU to be carried in an ODTUCn.M period
  • the number of bytes is calculated to obtain the clock information C nD of the LO ODU to be carried.
  • the method further includes: generating another mapping adaptation indication information according to a mapping granularity of another LO ODU to be carried, where the mapping granularity of the another LO ODU is M 1 ⁇ g 1 byte, where M 1 is the number of time slots occupied by the another LO ODU in the OPUCn, and g 1 is a mapping granularity corresponding to each time slot in the time slot occupied by the another LO ODU, where g 1 is greater than 1 a positive integer, where g 1 is not equal to g; mapping the other LO ODU to the ODTUCn.M 1 payload area according to the another mapping adaptation indication information, the ODTUCn.M 1 including the ODTUCn.M 1 overhead a zone and an ODTUCn.M 1 payload area; encapsulating the another mapping adaptation indication information into the ODTUCn.M 1 overhead area; encapsulating the ODTUCn.M 1 into the OTUCn.
  • the transmitting end device adopts a preset mapping algorithm according to the number of time slots M occupied by each LO ODU in the OPUCn and the mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU.
  • the individual to be respectively carried LO ODU mapping its corresponding particle size g to be mapped to a bearer carrying LO ODU to the number of data entities ODTUCn.M C m ODTUCn.M payload area of the same number, a mapping process
  • the clock information C nD of each LO ODU to be carried is the same.
  • any two LO ODUs to be carried are the same rate, for example, both are ODU2, the number M of slots occupied by the two LO ODUs to be carried is the same.
  • the mapping granularity g corresponding to a single time slot may be different; if any two LO ODUs to be carried are different rates, for example, one is ODU2 and the other is ODU3, the number of time slots occupied by the two LO ODUs to be carried The mapping granularity g corresponding to M and a single time slot is different.
  • the transmitting end device may further generate another mapping adaptation indication information according to the mapping granularity of another LO ODU, where the mapping granularity of the mapping adaptation indication information and the LO ODU is One-to-one correspondence, the number M of slots occupied by the OPUCn and the mapping granularity g corresponding to each slot in the occupied slots are also corresponding to the LO ODU. Finally, the ODTUCn.M formed by all LO ODU mappings is encapsulated into the same OTUCn, so that an OTUCN can carry multi-service, multi-rate, and multiple mapping granular LO ODUs.
  • mapping granularity is configured by a network management system NMS or a transport software defined network T-SDN controller.
  • FIG. 2A is a schematic diagram of mapping LO ODU services of multiple mapping granularities to OTUCn
  • FIG. 2B is another schematic diagram of mapping LO ODU services of multiple mapping granularities to OTUCn.
  • the LO ODUs to be carried are respectively determined by a preset mapping algorithm.
  • mapping each process to be carried LO ODU clock The information C nD is the same. If any two LO ODUs to be carried are the same rate, for example, both are ODU2, the number M of slots occupied by the two LO ODUs to be carried is the same, but corresponding to a single time slot.
  • the mapping granularity g may be different; if any two to-be-beared LO ODUs are different rates, for example, one is ODU2 and the other is ODU3, the number of slots occupied by the two LO ODUs to be carried and the mapping corresponding to a single time slot
  • the particle size g is different.
  • the LO ODUs respectively use different mapping granularity M ⁇ g bytes, and in FIG. 2A, the LO ODUs of different mapping granularities are mapped to the same ODTUCn.M payload area with the same number of slots M.
  • M is ts
  • g is 1 byte, 2 bytes, 4 bytes, and 8 bytes.
  • the LO ODUs of different mapping granularities are mapped to the number of slots M.
  • M is 1 to 10
  • g is 1 byte, 2 bytes, 4 bytes, and 8 bytes. These can be performed by a preset mapping algorithm.
  • the LO ODUs of different mapping granularities are mapped to different time slots of the OTUCn, that is, the bearers of the LO ODUs of different mapping granularities on the OTUCn are divided by time slots, and each time slot corresponds to one mapping adaptation indication information, and is sent.
  • the end device only needs to notify the receiving end device to perform demapping processing on the corresponding time slot when the mapping adaptation indication information indicates the overhead of the corresponding time slot, and the LO ODUs of different mapping granularities are finally mapped to In ODTUCn.M divided by time slots, there is no possibility that interworking cannot be performed because the mapping granularity is different.
  • the frame structure of the OTUCn in the present invention may have two cases: one is that the frame structure of the OTUCn includes a Forward Error Correction (FEC) check area, and FIG. 3 is a frame structure diagram of the OTUCn. As shown in FIG.
  • FEC Forward Error Correction
  • the frame structure is 4 rows ⁇ 4080n columns, wherein the 1-7n columns of the 1st row are frame header indication areas, and the (7n+1)-1414n columns of the 1st row are OTUCn overhead zones, The 1 to 14n columns of 2 to 4 rows are ODUCn overhead areas, the (14n+1) to 16n columns of the 1st to 4th rows are OPUCn overhead areas, and the 1st to 4th rows of (16n+1) to 3824n columns are OPUCn nets.
  • the (3824n+1) to 4080n columns in the first to fourth rows are the check regions; the other is that there is no FEC check region in the frame structure of the OTUCn, and FIG.
  • 4 is another frame structure diagram of the OTUCn, as shown in the figure. 4, the frame structure is 4 rows ⁇ 3824n columns, wherein the 1st to 7n columns of the 1st row are the frame header indication area, and the (7n+1) to 14n columns of the 1st row are the OTUCn overhead area, the second to the second row.
  • the 1 to 14n columns of the 4 rows are the ODUCn overhead regions
  • the (14n+1) to 16n columns of the 1st to 4th rows are the OPUCn overhead regions
  • the (16n+1) to 3824n columns of the 1st to 4th rows are the OPUCn payload regions.
  • the introduction of OTUCn makes the OTN line interface flexible, and the interface rate is variable based on the change of n.
  • the OPUCn payload area in the present invention includes a payload area of a first number of time slots, and the OPUCn overhead area is used to carry overhead information, and the overhead information includes mapping adaptation indication information, a payload structure indication PSI, and an OPU multiframe. Indicating OMFI, the overhead information corresponds to the first number of time slots.
  • the OPUCn overhead area includes an overhead area of the first number of time slots, and the overhead information carried by each of the overhead areas corresponds to one time slot, and the mapping adaptation indication information in each overhead information occupies 6 bytes, and the LO ODU is to be carried.
  • the number of data entities carried in the ODTUCn.M and the clock information of the LO ODU to be carried respectively occupy 3 bytes of 6 bytes, and the mapping adaptation type carries 3 words occupied by the clock information of the LO ODU to be carried. In the section.
  • FIG. 5A-5C are schematic diagrams showing the time division of the OPUCn overhead area and the OPUCn payload area.
  • the OPUCn payload area includes a payload area of 10n time slots, and the OPUCn overhead area is used for carrying.
  • the cost information includes mapping adaptation indication information, Payload Structure Identifier (PSI), and OPU Multi-Frame Identifier (OMFI), and overhead information and 10n time slots. correspond.
  • PSI Payload Structure Identifier
  • OMFI OPU Multi-Frame Identifier
  • the OPUCn overhead area includes an overhead area of 10n time slots, and the overhead information carried by each of the overhead areas corresponds to one time slot of the OPUCn payload area, and the mapping adaptation indication information in each overhead information occupies 6 words.
  • the number of data entities carried in the ODTUCn.M and the clock information of the LO ODU to be carried by the LO ODU are respectively occupied by 3 bytes of 6 bytes, and the mapping adaptation type is carried in the LO ODU to be carried.
  • the clock information occupies 3 bytes.
  • 10 OPUCn constitute a 10-OPUCn multiframe
  • the multiframe contains 40 rows ⁇ 3824n columns
  • the OPUCn payload area is (16n+1) to 3816n columns, which is divided into 10n 10Gbit/s by column spacing.
  • Gap, slot number is 1 ⁇ 10n
  • each slot contains 40 rows ⁇ 380 columns
  • OPUCn overhead area is (14n+1) ⁇ 16n columns, total 2n columns, every 4 acts one frame, so a 10-OPUCn complex
  • the frame includes 10 frames of OPUCn overhead regions, where (1 to 3 rows) ⁇ (14n+1) to 15n columns) and (1 to 3 rows) ⁇ (15n+1) to 16n columns of each frame.
  • the fourth row ⁇ ((14n+1) to 15n columns) is PSI, and the PSI is used to indicate that the time slot of OPUCn is occupied by ODTUCn.ts, and the fourth row of each frame ⁇ ((15n+1) to 16n columns)
  • OMFI there are a total of 10n PSI and 10n OMFI, and the PSI has a one-to-one correspondence with time slots.
  • the overhead corresponding to each time slot occurs once every 10 OPUCn frames (that is, the time slot overhead corresponding to each time slot in a 10-OPUCn multi-frame occurs only once), passing 5 to 8 bits in OMFI (its value is 0) ⁇ 9 sequentially loops) to identify OPUCn.
  • On the transmitting device set the value of OMFI to increase in units of OPUCn, from 0 to 9, and then to 0, and cycle sequentially.
  • OPUCn of 0-9 constitutes a 10-OPUCn complex.
  • Frame the receiving device can recognize OPUCn according to OMFI.
  • the overhead is located in the 14th+2th column of the first OPUCn and the 1st to 3rd rows of the 15th+2th column; the (3816n+1) to 3824n columns are filled areas.
  • the PSI may indicate that ODTUCn.ts is composed of which ts slots in the 10-OPUCn multiframe and the corresponding slot overhead, and the PSI is located in the fourth of each group.
  • the 14n+1 ⁇ 15n columns of the row respectively indicate the allocation of the 10n time slots, wherein the PSI[2] ⁇ PSI[21] of the 14n+1th column indicate the time slots 1 to 10, and the PSI of the 14n+2th column [ 2] ⁇ PSI[21] indicate time slots 11-20, and so on, and PSI[2] ⁇ PSI[21] of the 15nth column indicate time slots 10n-9 ⁇ 10n.
  • OMFI 5 to 8 bits in OMFI (the values are 0 to 9 in order)
  • OMFI is located in the 15n+1 ⁇ 16n column of the 4th row of each group, and is incremented by OPUCn, counting from 0 to 9, and then to 0, sequentially cycling, and OPUCn of 0-9 constitutes a 10-OPUCn
  • the receiving device can recognize OPUCn according to OMFI.
  • FIG. 6B is a schematic diagram of a PSI byte structure.
  • the PSI corresponding to each slot occupies 2 bytes, wherein the 1st bit of the 1st byte indicates whether the corresponding slot is occupied ( Occupation), if occupied, the bit is assigned a value of 1; otherwise, the bit is assigned a value of 0; the 2nd to 8th bits of the 1st byte and the 1st to 8th bits of the 2nd byte have a total of 15 bits corresponding to
  • the tributary port number (referred to as TP) assigned by the time slot is also the service indication of the LO ODU in the time slot. If the OPUCn carries the LO ODU service, the payload type (Payload Type, referred to as :PT) Assigned to 0x22, located in the 14n+1 column on the 4th line of each group.
  • the payload type (Payload Type, referred to as :PT) Assigned to 0x22, located in the 14
  • FIG. 6C is a schematic diagram of the OMFI byte structure. As shown in FIG. 6C, the Most Significant Bit (MSB) and the Last Significant Bit (LSB) of the OMFI are 0. 9 cycles in sequence.
  • MSB Most Significant Bit
  • LSB Last Significant Bit
  • FIG. 7 is a flowchart of another embodiment of a service mapping processing method of an optical transmission network according to the present invention. As shown in FIG. 7 , based on the structural diagram shown in FIG. 5A to FIG. 6C , the method in this embodiment may include:
  • Step 201 Generate mapping adaptation indication information according to a mapping granularity of the LO ODU to be carried and a preset mapping adaptation indication information format, where the mapping adaptation indication information includes the mapping adaptation type, and the LO ODU to be carried The number C m of data entities carried in the ODTUCn.M and the clock information C nD of the LO ODU to be carried;
  • the mapping granularity g corresponding to each slot in the slot occupied by the LO ODU, and within an ODTUCn.M period transferring the number of bytes to be calculated LO ODU carrier acquires the number C m carried in the data entity in the ODTUCn.M LO ODU is to be carried; LO ODU slot occupied in OPUCn be carried in accordance with the The quantity M, the mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU, and the number of bytes of the LO ODU to be carried in an ODTUCn.M period are calculated to obtain the LO to be carried. ODU clock information C nD .
  • the mapping granularity (M ⁇ g bytes) is configured by a Network Management System (NMS) or a Transport-Software Definition Network (T-SDN), and the transmitting device is configured according to the mapping granularity.
  • the g determines the mapping adaptation type in the mapping adaptation indication information.
  • C m is the number of data entities carried in the adaptation ODTUCn.M mapping information indicative of mapping the type adapted to be carried and to be carried LO ODU LO ODU clock information
  • C nD is adapted according to the mapping information indicative of the format
  • the mapping adaptation indication information is carried in the TSOH, and the mapping adaptation indication information format can be seen in FIG. 9A to FIG. 9C.
  • Table 2 shows the lower order ODUk mapping to the C m of the ODTUCn.M under each mapping granularity.
  • C m is the number of data entities step 202, according to the preset mapping adaptation indication information format, the LO ODU be carried in the carrying ODTUCn.M to be carried and the LO ODU clock information C
  • the nD is placed on a corresponding bit of the mapping adaptation indication information, and encapsulates the mapping adaptation indication information into the ODTUCn.M overhead area;
  • the number of bytes of the LO ODU to be carried in the period can be counted by the timing statistics, and the number of bytes of the LO ODU is obtained by judging the empty condition of the buffer.
  • the sending end device places the number C m of data entities to be carried in the ODTUCn.M and the clock information C nD of the LO ODU to be carried according to the mapping adaptation indication information format according to the mapping adaptation indication information format.
  • the mapping adaptation indication information is encapsulated into the ODTUCn.M overhead area, that is, placed in the TSOH of the corresponding time slot.
  • Step 203 According to the number M of time slots occupied by the LO ODU in each OPTUn and the mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU, the preset The mapping algorithm maps each of the to-be-beared LO ODUs with the corresponding mapping granularity g to the same number as the number C m of data entities carried in the ODTUCn.M of the LO ODU to be carried. In the ODTUCn.M payload area;
  • Step 203 is a further implementation manner of the foregoing step 102, the sending end device maps, to the ODTUCn.M payload area, the C m mapping LO ODU data with a gigabyte mapping granularity of g bytes by using a preset mapping algorithm.
  • the mapping algorithm can be a ⁇ - ⁇ algorithm.
  • Step 204 The ODTUCn.M payload is multiplexed into the OPUCn payload area, and The ODTUCn.M overhead is multiplexed into the OPUCn overhead area;
  • Step 205 adding the ODUCn overhead area, the OTUCn overhead area, and the frame header indication based on the OPUCn, and forming the OTUCn by encapsulation;
  • Steps 204-205 are the further implementation manner of the foregoing step 103.
  • the transmitting end device multiplexes the ODTUCn.M payload into the OPUCn payload area, and multiplexes the ODTUCn.M overhead into the OPUCn overhead area, that is, the OPUCn net in the OTUCn.
  • the ODTUCn.M payload area and the ODTUCn.M overhead area are respectively encapsulated in the time slot of the bearer ODTUCn.M determined in the piggy area and the OPUCn overhead area.
  • the OTUCn overhead area, the OTUCn overhead area, and the frame header indication area are added based on OPUCn to form a final OTUCn frame.
  • Step 206 Send the OTUCn to the receiving end device.
  • the time slot carrying the LO ODU and the mapping adaptation indication information filled in the corresponding time slot overhead area are respectively determined in the OPUCn payload area and the OPUCn overhead area.
  • ODTUCn.M is composed of ts time slots in a 10-OPUCn multiframe and its corresponding slot overhead, and ts represents the number of slots, and the ODTUCn
  • the ODMUCn.M payload area of .M contains 40 rows ⁇ (380 ⁇ ts) columns, and the ODTUCn.M overhead area contains TSOH corresponding to one slot in ts slots, and the one slot can be selected as ts slots.
  • the time slot overhead corresponding to the largest time slot in the code.
  • ODTUCn.M is composed of ts time slots in a 10-OPUCn multiframe and its corresponding slot overhead, and ts represents the number of slots.
  • the ODTUCn.M payload area of ODTUCn.M contains 40 rows ⁇ (380 ⁇ ts) columns, and the ODTUCn. M overhead region contains TSOH corresponding to ts time slots.
  • FIG. 9A is a schematic diagram of a format of a TSOH. As shown in FIG. 9A, this format is based on the original format allocation method in GMP, and uses reserved bits to represent the information added by the invention.
  • J1 and J2 are used to store the number of data entities C m carried in the ODTUCn.M to be carried LO ODU, C1 to C14 represent 14 bits of C m , and the 7th bit placement increment indication of J2 (Increment Indicator, referred to as: II), J2's 8th bit placement reduction indicator (Decrement Indicator, referred to as: DI); J3 placed J1 and J2 byte Cyclic Redundancy Check (CRC) -8 check information; J4 and J5 of 4 to 8 bits for placing clock information to be carried LO ODU C nD, a total of 10 bits, D1 ⁇ D10 represents C nD 10 bits; the J6 of 4 to 8 bits for The CRC-5 check information of J4 and J5 is placed;
  • FIG. 9B is a schematic diagram of another format of TSOH, as shown in Figure 9B, this format re-adjusts the 6 bytes of the allocated TSOH.
  • J1 and J2 are used to store the number of data entities C m carried in the ODTUCn.M to be carried LO ODU, C1 to C14 represent 14 bits of C m , and the 7th bit of J2 is placed II, J2 8 bits are placed in DI; J3 is placed in CRC-8 check information of J1 and J2 bytes; bits 1 to 2 of J4 and J5 are used to place mapping adaptation type, a total of 4 bits; J4 and J5 are 3 to 8 C nD clock information carrying bits to be used to place the LO ODU, a total of 12 bits, D1 ⁇ D12 represents C nD 12 bits; the J6 and J4 J5 placing byte CRC-8 bytes of check information.
  • This format is suitable for the ODTUCn.M structure shown in Fig. 8A.
  • FIG. 9C is another schematic diagram of the format of the TSOH. As shown in FIG. 9C, this format extends the placement of the clock information C nD of the LO ODU to be carried.
  • J1 and J2 are used to store the number of data entities C m carried in the ODTUCn.M to be carried LO ODU, C1 to C14 represent 14 bits of C m , and the 7th bit of J2 is placed II, J2 8 bits are placed in DI; J3 places CRC-8 check information of J1 and J2 bytes; bits 4 to 8 of J4 and J5 are used to place one of the clock information of the LO ODU to be carried, C nD _ts, a total of 10 bits, D1 to D10 represent 10 bits of C nD _ts; bits 4 to 8 of J6 are used to place CRC-5 check information of J4 and J5; and reserved bits 1 to 3 of J4 bytes are added for placement of mapping adaptation type .
  • one of the clock information of the LO ODU to be carried, C nD _1 is 10 bits in total.
  • D1 to D10 represent 10 bits of C nD _1;
  • one of the clock information of the LO ODU to be carried, C nD _2, is set to 10 bits, and D1 to D10 represent 10 bits of C nD _2; and so on, up to the tsth slot.
  • This format is suitable for the ODTUCn.M structure shown in Fig. 8B.
  • mapping of the LO ODU based on the mapping granularity to the ODTUCn.M is implemented, and the existing fixed mapping is solved.
  • the OTUCn carrying the same LO ODU but using different mapping granularities cannot communicate with each other at the transmitting and receiving ends.
  • FIGS. 9A to 9C are only three examples of the TSOH structure, and The configuration of the mapping adaptation indication information of the present invention may be carried by any of the deployment modes of the various bits of the JC1 to the JC6, which are not specifically limited.
  • FIG. 10 is a flowchart of still another embodiment of a service mapping processing method of an optical transmission network according to the present invention. As shown in FIG. 10, the method in this embodiment may include:
  • Step 301 Receive an optical channel transmission unit OTUCn sent by the source device.
  • the execution body of this embodiment may be a sink device in the OTN.
  • the receiving end device receives the OTUCn sent by the sending end device.
  • Step 302 Obtain an optical channel data tributary unit ODTUCn.M from the OTUCn, where the ODTUCn.M includes an ODTUCn.M overhead area and an ODTUCn.M payload area.
  • Step 303 Determine, according to the mapping adaptation indication information and the payload structure indication PSI carried in the ODTUCn.M overhead area, the mapping granularity, where the mapping granularity is M ⁇ g bytes, where M is the to-be-beared LO The number of time slots occupied by the ODU in the optical channel payload unit OPUCn, where g is the mapping granularity corresponding to each time slot in the time slot occupied by the LO ODU, and g is a positive integer greater than one;
  • the receiving end device extracts ODTUCn.M from the OTUCn in a reverse step to the method embodiment shown in FIG. 1 and FIG. 7, that is, acquires the ODTUCn.M payload area in the corresponding time slots of the OPUCn payload area and the OPUCn overhead area in the OTUCn. And the ODTUCn.M overhead area, parsing the mapping adaptation indication information and the payload structure indication PSI in the ODTUCn.M overhead area, and determining the mapping granularity.
  • Step 304 Demap the ODTUCn.M according to the mapping adaptation indication information to obtain a low-order optical channel data unit LO ODU.
  • the receiving end device demaps the LO ODU from the ODTUCn.M according to the mapping adaptation indication information and the mapping granularity.
  • the LO ODU is obtained by de-mapping the ODTUCn.M in the received OTUCn, and the demapping of the ODTUCn.M to the LO ODU based on the mapping granularity is implemented.
  • the same LO ODU is carried but the OTUCn without mapping granularity cannot be interworked at both ends.
  • the process in which the receiving end device acquires the LO ODU from the OTUCn is exactly opposite to the process in which the transmitting end device maps from the LO ODU to the OTUCn. Therefore, in the process of demapping, the mapping adaptation indication information and the mapping granularity are first obtained, based on this. Two messages can be in the corresponding time slot
  • the frame structure involved in the demapping process is consistent with the above method, and is not described here.
  • FIG. 11 is a flowchart of still another embodiment of a service mapping processing method of an optical transmission network according to the present invention. As shown in FIG. 11, the method in this embodiment may include:
  • Step 401 Receive an optical channel transmission unit OTUCn sent by the sending end device.
  • Step 402 obtaining an optical channel data tributary unit ODTUCn.M from the OTUCn;
  • Step 403 Acquire a mapping granularity corresponding to each time slot in the time slot occupied by the LO ODU according to the mapping adaptation type in the mapping adaptation indication information carried in the ODTUCn. ;
  • Step 404 Obtain, according to the PSI carried in the ODTUCn.M overhead area, the number M of time slots occupied by the LO ODU to be carried in the OPUCn;
  • Steps 402-404 are further implementations of the foregoing step 303, wherein the implementation process of step 404 may be: acquiring OMFI and PSI from the ODTUCn.M overhead area; identifying the OPUCn according to the OMFI; and acquiring the OPUCn according to the PSI The case where the time slot is occupied; the number M of time slots occupied by the LO ODU to be carried in the OPUCn is determined according to the PSI.
  • the receiving device determines whether the mapping granularity is consistent with the pre-configured mapping granularity, that is, determining that the mapping granularity Cg is consistent with the external configuration, and the external configuration may be configured by using an NMS or a T-SDN controller. Alarm.
  • Step 405 parsing the mapping information obtaining clock information indicating adaptation C m number of data entities of the LO ODU to bear the ODTUCn.M demapped to be in the ODTUCn.M of the LO ODU and the C nD ;
  • Step 406 The particle size of the LO ODU mapping, the number of data C m of the entity is carried in the LO ODU ODTUCn.M the mapping algorithm and a preset from the de-mapping in the ODTUCn.M LO ODU;
  • Step 407 The particle size of the LO ODU mapping, the number of data C m of the entity is carried in the LO ODU ODTUCn.M and the clock information of the LO ODU C nD acquires a calculation cycle ODTUCn.M The number of bytes in which the LO ODU is transmitted;
  • Step 408 Restore clock information of the LO ODU according to the number of bytes of the LO ODU transmitted in an ODTUCn.M period.
  • Steps 405-408 are the further implementation manner of the foregoing step 304.
  • the receiving end device parses the mapping adaptation indication information to obtain the number of data entities C m and LO ODU carried in the ODTUCn.M of the LO ODU to be demapped in the ODTUCn.M.
  • Clock information C nD using ⁇ - ⁇ algorithm to demap LO ODU from ODTUCn.M; then according to the mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU, and the LO ODU to be demapped
  • the LO ODU is obtained by de-mapping the ODTUCn.M in the received OTUCn, and the demapping of the ODTUCn.M to the LO ODU based on the mapping granularity is implemented.
  • the same LO ODU is carried but the OTUCn without mapping granularity cannot be interworked at both ends.
  • FIG. 12 is a schematic structural diagram of an embodiment of a transmitting end device according to the present invention.
  • the apparatus in this embodiment may include: an indication information generating module 11, a mapping module 12, a packaging module 13, and a sending module 14, where
  • the indication information generating module 11 is configured to generate mapping adaptation indication information according to a mapping granularity of the low-order optical channel data unit LO ODU to be carried, where the mapping granularity is M ⁇ g bytes, where M is the LO ODU to be carried
  • the mapping module 12 is configured to
  • the mapping adaptation indication information maps the to-be-beared LO ODU to an ODTUCn.M payload area in the optical channel data tributary unit ODTUCn.M, where the ODTUCn.M includes an O
  • the encapsulating module 13 is configured to encapsulate the mapping adaptation indication information into the ODTUCn.M overhead area; encapsulate the ODTUCn.M into an optical channel transmission unit OTUCn; and send a module 14 for The OTUCn is sent to the receiving end Set.
  • the device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 1 or FIG. 7.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the mapping adaptation indication information includes: a mapping adaptation type, where the mapping adaptation type is used to indicate a mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU.
  • mapping information indicating adaptation further comprising: the carrier to be the number of C m LO ODU is carried in the ODTUCn.M of the data entity and clock information to be carried in the C nD LO ODU,
  • the size of the data entity is M x g bytes.
  • the indication information generating module 11 is specifically configured to: according to the number M of time slots occupied by the LO ODU in the OPUCn, and each time slot in the time slot occupied by the LO ODU and transmitting the mapping g particle size within a period ODTUCn.M the number of bytes to be carried LO ODU calculated to be acquired bearer carrying the LO ODU C m in the number of data entities in the ODTUCn.M; in accordance with the Determining the number M of time slots occupied by the bearer LO ODU in the OPUCn, the mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU, and transmitting the to-be-beared LO in one ODTUCn.M period
  • the number of bytes of the ODU is calculated to obtain the clock information C nD of the LO ODU to be carried.
  • the indication information generating module 11 is further configured to generate another mapping adaptation indication information according to a mapping granularity of another LO ODU to be carried, where the mapping granularity of the another LO ODU is M 1 ⁇ g 1 word a section, where M 1 is the number of time slots occupied by the another LO ODU in the OPUCn, and g 1 is a mapping granularity corresponding to each time slot in the time slot occupied by the another LO ODU, g 1 is a positive integer greater than 1, wherein g 1 is not equal to g; the mapping module 12 is further configured to map the another LO ODU to the ODTUCn.M 1 payload according to the another mapping adaptation indication information region, the ODTUCn.M 1 1 payload area and an overhead area comprising ODTUCn.M 1 ODTUCn.M; the encapsulation module 13 is further adapted for mapping the indication information further encapsulated into the ODTUCn.M 1 overhead area; encapsulating the ODTUCn.
  • mapping granularity is configured by a network management system NMS or a transport software defined network T-SDN controller.
  • the indication information generating module 11, the mapping module 12, and the encapsulating module 13 in this embodiment may be implemented by a central processing unit (CPU), the sending module 14 may be implemented by a transmitter, and the code program may be stored in the memory. And the related data, the CPU, the transmitter, and the memory can be connected by a bus, wherein the CPU is used to read the code program from the memory, and the steps of the method embodiment shown in FIG. 1 or FIG. 7 are executed, and the transmitter is used for the receiving end.
  • the device sends the OTUCn that carries the LO ODU corresponding to the multiple services.
  • FIG. 13 is a schematic structural diagram of an embodiment of a receiving end device according to the present invention.
  • the apparatus in this embodiment may include: a receiving module 21, an obtaining module 22, a determining module 23, and The demapping module 24, wherein the receiving module 21 is configured to receive the optical channel transmission unit OTUCn sent by the transmitting device, and the acquiring module 22 is configured to acquire the optical channel data tributary unit ODTUCn.M from the OTUCn, the ODTUCn
  • the M includes an ODTUCn.M overhead area and an ODTUCn.M payload area.
  • the determining module 23 is configured to determine a mapping granularity according to the mapping adaptation indication information and the payload structure indication PSI carried in the ODTUCn.M overhead area.
  • the mapping granularity is M ⁇ g bytes, where M is the number of time slots occupied by the LO ODU to be carried in the optical channel payload unit OPUCn, and g is each time slot occupied by the LO ODU
  • the size of the mapping corresponding to the slot, g is a positive integer greater than 1
  • the demapping module 24 is configured to demap the ODTUCn.M according to the mapping adaptation indication information to obtain a low-order optical channel data unit LO ODU.
  • the device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 10 or FIG. 11 , and the implementation principle and technical effects are similar, and details are not described herein again.
  • the mapping adaptation indication information includes: a mapping adaptation type, where the mapping adaptation type is used to indicate a mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU.
  • mapping information indicating adaptation further comprising: the carrier to be carried LO ODU to the number C m ODTUCn.M of the data entity and clock information to be carried LO ODU C nD of the The size of the data entity is M x g bytes.
  • the determining module 23 is configured to acquire, according to the mapping adaptation indication information, a mapping granularity g corresponding to each time slot in the time slot occupied by the LO ODU; and obtain the to-be-acquired according to the PSI.
  • the demapping module 24 is configured to parse the mapping adaptation indication information to obtain the number of data entities carried in the ODTUCn.M of the LO ODU to be mapped in the ODTUCn.M. Cm and clock information C nD of the LO ODU; according to the mapping granularity, the number of data entities C m carried in the ODUUCn.M of the LO ODU, and a preset mapping algorithm from the ODTUCn.
  • Decoding out the LO ODU in M calculating, according to the mapping granularity, the number of data entities C m carried in the ODUUCn.M of the LO ODU, and the clock information C nD of the LO ODU
  • the number of bytes of the LO ODU is transmitted in the ODTUCn.M cycle; the clock information of the LO ODU is restored according to the number of bytes of the LO ODU transmitted in one ODTUCn.M period.
  • the obtaining module 22, the determining module 23, and the demapping module 24 in this embodiment may be implemented by a CPU, and the receiving module 21 may be implemented by a receiver, and the memory stores a code program and related data, between the CPU, the receiver, and the memory.
  • the method may be connected by using a bus, where the receiver is configured to receive an OTUCn that is sent by the sending end device and carries a LO ODU corresponding to multiple services, and the CPU is used to read the code program from the memory, and the method embodiment shown in FIG. 10 or FIG. 11 is executed.
  • FIG. 14 is a schematic structural diagram of an embodiment of an optical transmission network according to the present invention.
  • the system in this embodiment includes: a transmitting end device 11 and a receiving end device 12; and the transmitting end device 11 can adopt the FIG.
  • the technical solution of the method embodiment shown in FIG. 1 or FIG. 7 can be performed correspondingly, and the implementation principle and the technical effect are similar, and details are not described herein;
  • the structure of the device embodiment shown in FIG. 13 is correspondingly implemented, and the technical solution of the method embodiment shown in FIG. 10 or FIG. 11 can be performed.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 15 is a schematic diagram of a mapping process of the transmitting and receiving ends of the present invention. According to the structure of FIG. 14, the mapping and demapping process between the LO ODU and the OTUCn at the transmitting and receiving ends can be implemented.
  • the present invention needs to map the LO ODU to the ODTUCn.M according to the mapping granularity. Since the mapping granularity corresponding to the single time slot of the OPUCn shown is C 64 , C 32 , C 16 , C 8 , etc., in order to reduce the cost, it needs to be considered. Mapping and demapping processing supporting multiple mapping granularities can be implemented in the same circuit.
  • FIG. 16 is a schematic diagram of a circuit structure of the transmitting and receiving ends of the optical transmission network under fast clock processing.
  • the mapping granularity of 1 byte (C 8 ) and 4 bytes (C 32 ) is simultaneously supported by the C 8 clock.
  • a ⁇ - ⁇ algorithm module is compatible with the processing of these two mapping granularities.
  • the ⁇ - ⁇ algorithm calculates the mapping pattern according to the obtained C m value at C 8 clock, and generates a corresponding cache read enable indication, and reads the LO ODU data from the cache.
  • the C 32 notch GAP control module generates a gap control signal
  • the gap control signal passes the count C 8
  • the rising edge of the clock generates a valid indication every 4 rising edges, and sends the gap control signal to the ⁇ - ⁇ algorithm module.
  • the ⁇ - ⁇ algorithm is based on the obtained C m value at C 8 clock and the gap control signal is valid.
  • the mapping pattern is calculated, and a corresponding cache read enable indication is generated, and the data of the LO ODU is read out from the cache and mapped into the ODTUCn.M payload area according to the ts ⁇ 4 byte granularity.
  • FIG. 17 is a schematic diagram of a circuit structure of the transmitting and receiving ends of the optical transmission network under slow clock processing.
  • two mapping granularities of 1 byte (C 8 ) and 4 bytes (C 32 ) are simultaneously supported under the C 32 clock.
  • the four ⁇ - ⁇ algorithm modules are compatible with both mapping granularity processing.
  • the ⁇ - ⁇ algorithm module performs calculations at the same time, respectively calculates the mapping patterns of the current four positions, and respectively generates a read enable indication corresponding to the cache, reads the LO ODU data from the cache and maps into ODTUCn according to the ts byte granularity. M payload area.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

一种光传输网的业务映射处理方法、装置及系统，包括：根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，映射粒度为M×g字节，其中，M为待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；根据映射适配指示信息将待承载LO ODU映射至光通道数据支路单元ODTUCn.M中的ODTUCn.M净荷区，ODTUCn.M包括ODTUCn.M开销区和ODTUCn.M净荷区；将映射适配指示信息封装入ODTUCn.M开销区；将ODTUCn.M封装至光通道传输单元OTUCn；将OTUCn发送给接收端设备。以上方法避免了因为采用了不用映射粒度的OTUCn在收发两端无法互通的问题。

Description

光传输网的业务映射处理方法、装置及系统 技术领域
本发明实施例涉及通信技术，尤其涉及一种光传输网的业务映射处理方法、装置及系统。
背景技术
光传送网(Optical transport network，简称：OTN)技术作为下一代传送网的核心技术，包括电层和光层两方面的技术规范，其中，针对电层技术规范，目前国际电信联盟远程通信标准化组织(International Telecommunication Union Telecommunication Standardization Sector，简称：ITU-T)已经定义的OTN为4×4080的结构。但是为满足流量不断增长的上层互联网协议(Internet Protocol，简称：IP)业务传送，OTN对应的电层技术，同样需要提供相匹配的可变速率OTN。目前ITU-T正在讨论制定一种新的超100Gbit/s速率的光通道传输单元(Optical Channel Transport Unit，简称：OTU)Cn，该OTUCn的比特速率为n倍基准速率，其中基准速率优选为100Gbit/s，n可变，C为罗马数字100。针对OTUCn的出现，采用通用映射规程(Generic Mapping Procedure，简称：GMP)将低阶(Low Order，简称：LO)光通道数据单元(Optical Channel Data Unit简称：ODU)映射到OTUCn，其映射粒度固定为LO ODU所占用的OTUCn中的光通道净荷单元(Optical Channel Payload Unit，简称：OPU)的时隙数量。
但是这种方法，采用固定的映射粒度，不够灵活，会导致承载了相同的LO ODU却采用了不同映射粒度的OTUCn在收发两端无法互通的问题。
发明内容
本发明实施例提供一种光传输网的业务映射处理方法、装置及系统，以解决采用不同映射粒度的OTUCn在收发两端无法互通的问题。
第一方面，本发明实施例提供一种光传输网的业务映射处理方法，包 括：
根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
根据所述映射适配指示信息将所述待承载LO ODU映射至光通道数据支路单元ODTUCn.M中的ODTUCn.M净荷区，所述ODTUCn.M包括ODTUCn.M开销区和所述ODTUCn.M净荷区；
将所述映射适配指示信息封装入所述ODTUCn.M开销区；
将所述ODTUCn.M封装至光通道传输单元OTUCn；
将所述OTUCn发送给接收端设备。
结合第一方面，在第一方面的第一种可能的实现方式中，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
结合第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
结合第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，所述根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，包括：
根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm；
根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的时钟信息CnD。
结合第一方面、第一方面的第一种至第三种可能的实现方式，在第一 方面的第四种可能的实现方式中，所述方法还包括：
根据待承载的另一LO ODU的映射粒度生成另一映射适配指示信息，所述另一LO ODU的映射粒度为M1×g1字节，其中，M1为所述另一LO ODU在所述OPUCn中占用的时隙的数量，g1为所述另一LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g1为大于1的正整数，其中g1不等于g；
根据所述另一映射适配指示信息将所述另一LO ODU映射至ODTUCn.M1净荷区，所述ODTUCn.M1包括ODTUCn.M1开销区和ODTUCn.M1净荷区；
将所述另一映射适配指示信息封装入所述ODTUCn.M1开销区；
将所述ODTUCn.M1封装至所述OTUCn。
结合第一方面、第一方面的第一种至第四种中任一种可能的实现方式，在第一方面的第五种可能的实现方式中，所述映射粒度由网络管理系统NMS或传输软件定义网络T-SDN控制器配置。
第二方面，本发明实施例提供一种光传输网的业务映射处理方法，包括：
接收发送端设备发送的光通道传输单元OTUCn；
从所述OTUCn中获取光通道数据支路单元ODTUCn.M，所述ODTUCn.M包括ODTUCn.M开销区和ODTUCn.M净荷区；
根据所述ODTUCn.M开销区中携带的映射适配指示信息和净荷结构指示PSI，确定映射粒度，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU。
结合第二方面，在第二方面的第一种可能的实现方式中，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
结合第二方面的第一种可能的实现方式，在第二方面的第二种可能的 实现方式中，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
结合第二方面的第二种可能的实现方式，在第二方面的第三种可能的实现方式中，所述根据所述ODTUCn.M开销区中携带的映射适配指示信息和净荷结构指示PSI，确定映射粒度，包括：
根据所述映射适配指示信息中的所述映射适配类型获取所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g；
根据所述PSI获取所述待承载LO ODU在OPUCn中占用的时隙的数量M。
结合第二方面的第三种可能的实现方式，在第二方面的第四种可能的实现方式中，所述根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU，包括：
解析所述映射适配指示信息获取所述ODTUCn.M中待解映射的所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述LO ODU的时钟信息CnD；
根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及预设的映射算法从所述ODTUCn.M中解映射出所述LO ODU；
根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及所述LO ODU的时钟信息CnD计算获取在一个ODTUCn.M周期内传送所述LO ODU的字节数量；
根据所述在一个ODTUCn.M周期内传送所述LO ODU的字节数量恢复所述LO ODU的时钟信息。
第三方面，本发明实施例提供一种发送端装置，包括：
指示信息生成模块，用于根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
映射模块，用于根据所述映射适配指示信息将所述待承载LO ODU映射至光通道数据支路单元ODTUCn.M中的ODTUCn.M净荷区，所述ODTUCn.M包括ODTUCn.M开销区和所述ODTUCn.M净荷区；
封装模块，用于将所述映射适配指示信息封装入所述ODTUCn.M开销区；将所述ODTUCn.M封装至光通道传输单元OTUCn；
发送模块，用于将所述OTUCn发送给接收端装置。
结合第三方面，在第三方面的第一种可能的实现方式中，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
结合第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
结合第三方面的第二种可能的实现方式，在第三方面的第三种可能的实现方式中，所述指示信息生成模块，具体用于根据所述所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm；根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的时钟信息CnD。
结合第三方面、第三方面的第一种至第三种中任一种可能的实现方式，在第三方面的第四种可能的实现方式中，所述指示信息生成模块，还用于根据待承载的另一LO ODU的映射粒度生成另一映射适配指示信息，所述另一LO ODU的映射粒度为M1×g1字节，其中，M1为所述另一LO ODU在所述OPUCn中占用的时隙的数量，g1为所述另一LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g1为大于1的正整数，其中g1不等于g；
所述映射模块，还用于根据所述另一映射适配指示信息将所述另一 LO ODU映射至ODTUCn.M1净荷区，所述ODTUCn.M1包括ODTUCn.M1开销区和ODTUCn.M1净荷区；
所述封装模块，还用于将所述另一映射适配指示信息封装入所述ODTUCn.M1开销区；将所述ODTUCn.M1封装至所述OTUCn。
结合第三方面、第三方面的第一种至第四种中任一种可能的实现方式，在第三方面的第五种可能的实现方式中，所述映射粒度由网络管理系统NMS或传输软件定义网络T-SDN控制器配置。
第四方面，本发明实施例提供一种接收端装置，包括：
接收模块，用于接收发送端设备发送的光通道传输单元OTUCn；
获取模块，用于从所述OTUCn中获取光通道数据支路单元ODTUCn.M，所述ODTUCn.M包括ODTUCn.M开销区和ODTUCn.M净荷区；
确定模块，用于根据所述ODTUCn.M开销区中携带的获取映射适配指示信息和净荷结构指示PSI，确定映射粒度，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
解映射模块，用于根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU。
结合第四方面，在第四方面的第一种可能的实现方式中，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
结合第四方面的第一种可能的实现方式，在第四方面的第二种可能的实现方式中，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
结合第四方面的第二种可能的实现方式，在第四方面的第三种可能的实现方式中，所述确定模块，具体用于根据所述映射适配指示信息获取所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g；根据所述PSI获取所述待承载LO ODU在OPUCn中占用的时隙的数量M。
结合第四方面的第三种可能的实现方式，在第四方面的第四种可能的实现方式中，所述解映射模块，具体用于解析所述映射适配指示信息获取所述ODTUCn.M中待解映射的所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述LO ODU的时钟信息CnD；根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及预设的映射算法从所述ODTUCn.M中解映射出所述LO ODU；根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及所述LO ODU的时钟信息CnD计算获取在一个ODTUCn.M周期内传送所述LO ODU的字节数量；根据所述在一个ODTUCn.M周期内传送所述LO ODU的字节数量恢复所述LO ODU的时钟信息。
第五方面，本发明实施例提供一种光传输网，包括：发送端装置和接收端装置；所述发送端装置采用第三方面、第三方面的第一种至第五种中任一种可能的实现方式所述的装置，所述接收端装置采用第四方面、第四方面的第一种至第四种中任一种可能的实现方式所述的装置。
值得说明的是，本发明实施例所说的LO ODU的映射是指将LO ODU的信号填充至该LO ODU所占用的时隙中。这种映射并非一次完成的，往往需要多次映射才能将待承载的LO ODU信号填充至其所占用的时隙中。这种多次映射过程中，每次映射过程中所映射的该LO ODU信号的字节数即称为该LO ODU的映射粒度。因为一个LO ODU信号可能占用多个时隙，每个映射过程中映射进每个所占用的时隙的字节数是相同的，这种每次映射过程中映射进单个时隙中的字节数称为该LO ODU所占用的时隙中单个时隙对应的映射粒度。
本发明实施例光传输网的业务映射处理方法、装置及系统，通过确定映射粒度并根据映射粒度生成映射适配指示信息以指示接收端设备进行相应的解映射，实现基于映射粒度的LO ODU向ODTUCn.M的映射，解决现有的固定的映射粒度情况下，承载了相同的LO ODU却采用了不同映射粒度的OTUCn在收发两端无法互通的问题。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对 实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明光传输网的业务映射处理方法的一个实施例的流程图；
图2A为多种映射粒度的LO ODU业务映射至OTUCn的一个示意图；
图2B为多种映射粒度的LO ODU业务映射至OTUCn的另一个示意图；
图3为OTUCn的一个帧结构示意图；
图4为OTUCn的另一个帧结构示意图；
图5A-图5C为OPUCn开销区和OPUCn净荷区时隙划分的一个示意图；
图6A为OPUCn开销区的一个示意图；
图6B为PSI字节结构的一个示意图；
图6C为OMFI字节结构的一个示意图；
图7为本发明光传输网的业务映射处理方法的另一个实施例的流程图；
图8A为ODTUCn.M一个结构的示意图；
图8B为ODTUCn.M另一个结构的示意图；
图9A为TSOH的一个格式示意图；
图9B为TSOH的另一个格式示意图；
图9C为TSOH的又一个格式示意图；
图10为本发明光传输网的业务映射处理方法的又一个实施例的流程图；
图11为本发明光传输网的业务映射处理方法的再一个实施例的流程图；
图12为本发明发送端装置的一个实施例的结构示意图；
图13为本发明接收端装置的一个实施例的结构示意图；
图14为本发明光传输网的一个实施例的结构示意图；
图15为本发明收发两端的映射处理过程示意图；
图16为快时钟处理下光传输网收发两端的一个电路结构示意图；
图17为慢时钟处理下光传输网收发两端的一个电路结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
图1为本发明光传输网的业务映射处理方法的一个实施例的流程图，如图1所示，本实施例的方法可以包括：
步骤101、根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
本实施例的执行主体可以是OTN中的发送端设备。目前ITU-T正在讨论制定的OTUCn可以表示超100Gbit/s速率，该OTUCn的比特速率为n倍基准速率，n可变，C为罗马数字100。针对OTUCn的出现，需要将LO ODU映射到OTUCn上，当前芯片对于OPUCn单个时隙带宽的处理能力对应的最佳映射粒度为4字节(C32)或者8字节(C64)，随着芯片处理能力的进一步提升，以及OTUCn表示的速率的增长，映射粒度将趋近更小，会出现2字节(C16)、1字节(C8)等情况。为了避免由于映射粒度的不同导致收发两端无法互通的情况，需要根据待承载LO ODU的映射粒度生成映射适配指示信息，该映射粒度是可变的，可以根据实际情况从C64、C32、C16、C8等中选择待承载LO ODU占用的OPUCn单个时隙对应的映射粒度g，进一步根据待承载LO ODU占用的OPUCn的时隙的数量M，计算确定LO ODU的映射粒度为M×g字节。映射适配指示信息主要是发送端设备用于向接收端设备指示LO ODU到OTUCn的映射信息。
步骤102、根据所述映射适配指示信息将所述待承载LO ODU映射至光通道数据支路单元ODTUCn.M中的ODTUCn.M净荷区，所述 ODTUCn.M包括ODTUCn.M开销区和所述ODTUCn.M净荷区；
发送端设备根据映射适配指示信息将待承载LO ODU映射至ODTUCn.M，ODTUCn.M是由OPUCn中的部分时隙及其时隙开销组成的，ODTUCn.M中承载了LO ODU数据。ODTUCn.M开销区承载映射适配指示信息，ODTUCn.M净荷区承载LO ODU数据，接收端在解析到ODTUCn.M开销区中承载的映射适配指示信息后，即可在ODTUCn.M净荷区中解映射出LO ODU数据。
步骤103、将所述映射适配指示信息封装入所述ODTUCn.M开销区；
步骤104、将所述ODTUCn.M封装至光通道传输单元OTUCn；
由于ODTUCn.M是由OPUCn中的部分时隙及其时隙开销组成的，因此发送端设备将ODTUCn.M封装至OPUCn时，即将ODTUCn.M分别封装至OPUCn相应的时隙中，之后添加ODUCn开销，OTUCn开销，帧头指示形成OTUCn帧。
步骤105、将所述OTUCn发送给接收端设备。
发送端设备将封装好后的OTUCn发送给接收端设备，这样在OTUCn承载了LO ODU数据，并且由于映射过程是基于可变映射粒度的，因此接收端设备接收到OTUCn后可以根据映射适配指示信息可以获取OPUCn的哪些时隙上承载了LO ODU，从而对其进行解映射，而且映射粒度也被指示在映射适配指示信息中，接收端设备可以以与映射粒度相应的方式进行解映射，从而避免了因为采用了不用映射粒度的OTUCn在收发两端无法互通的问题。
本实施例，通过确定映射粒度并根据映射粒度生成映射适配指示信息以指示接收端设备进行相应的解映射，实现基于映射粒度的LO ODU向ODTUCn.M的映射，解决现有的固定的映射粒度情况下，承载了相同的LO ODU却采用了不同映射粒度的OTUCn在收发两端无法互通的问题。
进一步的，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
进一步的，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU 的时钟信息CnD，所述数据实体的大小为M×g字节。
进一步的，上述步骤101，具体的实现方法可以是：根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm；根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的时钟信息CnD。
进一步的，所述方法还包括：根据待承载的另一LO ODU的映射粒度生成另一映射适配指示信息，所述另一LO ODU的映射粒度为M1×g1字节，其中，M1为所述另一LO ODU在所述OPUCn中占用的时隙的数量，g1为所述另一LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g1为大于1的正整数，其中g1不等于g；根据所述另一映射适配指示信息将所述另一LO ODU映射至ODTUCn.M1净荷区，所述ODTUCn.M1包括ODTUCn.M1开销区和ODTUCn.M1净荷区；将所述另一映射适配指示信息封装入所述ODTUCn.M1开销区；将所述ODTUCn.M1封装至所述OTUCn。
具体来讲，发送端设备根据每一个待承载LO ODU在OPUCn中占用的时隙的数量M和LO ODU所占用的时隙中每个时隙对应的映射粒度大小g，通过预设的映射算法将各个待承载LO ODU分别以其对应的映射粒度大小g映射至与待承载LO ODU的承载于ODTUCn.M中的数据实体的数量Cm相同个数的ODTUCn.M净荷区中，映射过程中各个待承载LO ODU的时钟信息CnD均是相同的，如果任意两个待承载LO ODU是相同速率，例如都为ODU2，则这两个待承载LO ODU占用的时隙的数量M是相同的，但是单个时隙对应的映射粒度g可以不同；如果任意两个待承载LO ODU是不同速率，例如一个为ODU2，另一个为ODU3，则这两个待承载LO ODU占用的时隙的数量M和单个时隙对应的映射粒度g均不相同。
因此，本实施例中发送端设备还可以根据另一个LO ODU的映射粒度生成另一映射适配指示信息，映射适配指示信息与LO ODU的映射粒度是 一一对应的，其在OPUCn中占用的时隙的数量M和所占用的时隙中每个时隙对应的映射粒度大小g也是与LO ODU对应的。而最终将所有LO ODU映射形成的ODTUCn.M都封装至同一个OTUCn中，这样在一个OTUCn即可承载多业务、多速率、多种映射粒度的LO ODU。
进一步的，所述映射粒度由网络管理系统NMS或传输软件定义网络T-SDN控制器配置。
图2A为多种映射粒度的LO ODU业务映射至OTUCn的一个示意图，图2B为多种映射粒度的LO ODU业务映射至OTUCn的另一个示意图。根据每一个待承载LO ODU在OPUCn中占用的时隙的数量M和LO ODU所占用的时隙中每个时隙对应的映射粒度大小g，通过预设的映射算法将各个待承载LO ODU分别以对应的映射粒度大小g映射至与待承载LO ODU的承载于ODTUCn.M中的数据实体的数量Cm相同个数的ODTUCn.M净荷区中，映射过程中各个待承载LO ODU的时钟信息CnD均是相同的，如果任意两个待承载LO ODU是相同速率，例如都为ODU2，则这两个待承载LO ODU占用的时隙的数量M是相同的，但是单个时隙对应的映射粒度g可以不同；如果任意两个待承载LO ODU是不同速率，例如一个为ODU2，另一个为ODU3，则这两个待承载LO ODU占用的时隙的数量M和单个时隙对应的映射粒度g均不相同。如图2A和图2B所示，LO ODU分别采用不同的映射粒度M×g字节，图2A中是将不同映射粒度的LO ODU映射至时隙的数量M相同的ODTUCn.M净荷区中，此示例中M为ts，g为1个字节、2个字节、4个字节、8个字节，图2B中是将不同映射粒度的LO ODU映射至时隙的数量M也不相同的ODTUCn.M净荷区中，此示例中M为1～10，g为1个字节、2个字节、4个字节、8个字节，通过预设的映射算法可以将这些不同映射粒度的LO ODU映射至OTUCn的不同的时隙上，即不同映射粒度的LO ODU在OTUCn上的承载都是以时隙划分的，每个时隙对应有一个映射适配指示信息，发送端设备只需要在映射适配指示信息指示出其对应的时隙的开销情况，即可通知接收端设备在相应的时隙上进行解映射处理，并且不同映射粒度的LO ODU最终都被映射至以时隙划分的ODTUCn.M中，不会出现因为映射粒度不同而无法互通的情况。
本发明中的OTUCn的帧结构可以有两种情况：一种是OTUCn的帧结构中包括前向错误纠正(Forward Error Correction，简称：FEC)校验区，图3为OTUCn的一个帧结构示意图，如图3所示，该帧结构为4行×4080n列，其中，第1行的1～7n列为帧头指示区，第1行的(7n+1)～14n列为OTUCn开销区，第2～4行的1～14n列为ODUCn开销区，第1～4行的(14n+1)～16n列为OPUCn开销区，第1～4行的(16n+1)～3824n列为OPUCn净荷区，第1～4行的(3824n+1)～4080n列为校验区；另一种是OTUCn的帧结构中没有FEC校验区，图4为OTUCn的另一个帧结构示意图，如图4所示，该帧结构为4行×3824n列，其中，第1行的1～7n列为帧头指示区，第1行的(7n+1)～14n列为OTUCn开销区，第2～4行的1～14n列为ODUCn开销区，第1～4行的(14n+1)～16n列为OPUCn开销区，第1～4行的(16n+1)～3824n列为OPUCn净荷区。OTUCn的引入使OTN线路接口灵活化，接口速率基于n的变化可变。
进一步的，本发明中的OPUCn净荷区包括第一数量个时隙的净荷区，OPUCn开销区用于承载开销信息，开销信息包括映射适配指示信息、净荷结构指示PSI以及OPU复帧指示OMFI，开销信息与第一数量个时隙对应。OPUCn开销区包括第一数量个时隙的开销区，每个开销区承载的开销信息与一个时隙对应，每个开销信息中的映射适配指示信息占用6个字节，待承载LO ODU的承载于ODTUCn.M中的数据实体的数量和待承载LO ODU的时钟信息分别占用6个字节中的3个字节，映射适配类型承载在待承载LO ODU的时钟信息占用的3个字节中。
下面采用一个具体的实施例，对图1所示方法实施例的技术方案进行详细说明。
图5A-图5C为OPUCn开销区和OPUCn净荷区时隙划分的一个示意图，如图5A-图5C所示，OPUCn净荷区包括10n个时隙的净荷区，OPUCn开销区用于承载开销信息，该开销信息包括映射适配指示信息、净荷结构指示(Payload Structure Identifier，简称：PSI)以及OPU复帧指示(OPU Multi-Frame Identifier，简称：OMFI)，开销信息与10n个时隙对应。OPUCn开销区包括10n个时隙的开销区，每个开销区承载的开销信息与OPUCn净荷区的一个时隙对应，每个开销信息中的映射适配指示信息占用6个字 节，待承载LO ODU的承载于ODTUCn.M中的数据实体的数量和待承载LO ODU的时钟信息分别占用6个字节中的3个字节，映射适配类型承载在待承载LO ODU的时钟信息占用的3个字节中。
本示例中，10个OPUCn构成一个10-OPUCn复帧，该复帧包含40行×3824n列，OPUCn净荷区为(16n+1)～3816n列，按列间隔划分为10n个10Gbit/s时隙，时隙编号为1～10n，每个时隙包含40行×380列；OPUCn开销区为(14n+1)～16n列，共2n列，每4行为一帧，因此一个10-OPUCn复帧包括10帧OPUCn开销区，其中，每帧的(1～3行)×((14n+1)～15n列)和每帧的(1～3行)×((15n+1)～16n列)为时隙(Tributary Slot，简称：TS)开销(Overhead，简称：OH)，一共有20n个TSOH，两个TSOH对应一个时隙，本发明中的TSOH承载映射适配指示信息；每帧的第4行×((14n+1)～15n列)为PSI，PSI用于指示OPUCn的时隙被ODTUCn.ts占用的情况，每帧的第4行×((15n+1)～16n列)为OMFI，一共有10n个PSI和10n个OMFI，PSI与时隙是一一对应的。每个时隙对应的开销每10个OPUCn帧出现一次(即一个10-OPUCn复帧中每个时隙对应的时隙开销只出现一次)，通过OMFI中的5～8比特(其值为0～9依次循环)识别OPUCn，在发送端设备，设置OMFI的值以OPUCn为单位依次递增，从0计数到9，然后再到0，依次循环，0～9的OPUCn即构成一个10-OPUCn复帧，接收端设备根据OMFI即可识别OPUCn。
若采用10(j-1)+i来表示时隙编号(j为1～n，i为1～10)，则其对应的TSOH位于第i个OPUCn的第14n+j列和第15n+j列的1～3行，一个时隙对应的TSOH共6个字节，6个字节分别标记为J1，J2，J3，J4，J5，J6，例如TS11(j＝2，i＝1)，其开销位于第1个OPUCn的第14n+2列和第15n+2列的1～3行；(3816n+1)～3824n列为填充区。
图6A为OPUCn开销区的一个示意图，如图6A所示，PSI可以指示ODTUCn.ts由10-OPUCn复帧中的哪ts个时隙以及对应的时隙开销组成，PSI位于每组的第4行的14n+1～15n列，分别指示10n时隙的分配情况，其中，第14n+1列的PSI[2]～PSI[21]指示时隙1～10，第14n+2列的PSI[2]～PSI[21]指示时隙11～20，以此类推，第15n列的PSI[2]～PSI[21]指示时隙10n-9～10n。OMFI中的5～8比特(其值为0～9依次循环)识别 OPUCn，OMFI位于每组的第4行的15n+1～16n列，以OPUCn为单位依次递增，从0计数到9，然后再到0，依次循环，0～9的OPUCn即构成一个10-OPUCn复帧，接收端设备根据OMFI即可识别OPUCn。
图6B为PSI字节结构的一个示意图，如图6B所示，每个时隙对应的PSI占用2个字节，其中，第1个字节的第1比特表示对应的时隙是否被占用(Occupation)，若占用，则该比特位赋值为1；否则，该比特位赋值为0；第1个字节的第2～8比特和第2个字节第1～8比特共15比特表示对应的时隙所分配的支路端口号(Tributary Port，简称：TP)，也即为该时隙中承载LO ODU的业务指示，若OPUCn承载有LO ODU业务时，净荷类型(Payload Type，简称：PT)赋值为0x22，位于每组的第4行的14n+1列。
图6C为OMFI字节结构的一个示意图，如图6C所示，OMFI的最高有效位(Most Significant Bit，简称：MSB)和最低有效位(Last Significant Bit，简称：LSB)，其值为0～9依次循环。
图7为本发明光传输网的业务映射处理方法的另一个实施例的流程图，如图7所示，基于图5A-图6C所示的结构示意图，本实施例的方法可以包括：
步骤201、根据待承载LO ODU的映射粒度和预设的映射适配指示信息格式生成映射适配指示信息，所述映射适配指示信息包括所述映射适配类型、所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及所述待承载LO ODU的时钟信息CnD；
具体来讲，根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm；根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的时钟信息CnD。
映射粒度(M×g字节)由网络管理系统(Network Management System， 简称：NMS)或传输软件定义网络(Transport-Software Definition Network，简称：T-SDN)进行配置，发送端设备根据映射粒度中的g确定映射适配指示信息中的映射适配类型。映射适配指示信息中的映射适配类型、待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及待承载LO ODU的时钟信息CnD是按照映射适配指示信息格式组合起来的，映射适配指示信息被承载在TSOH中，映射适配指示信息格式可以参见图9A-图9C。映射适配类型与OPUCn单个时隙对应的映射粒度g字节，以及LO ODU的映射粒度的关系可以参见表1，表2为各映射粒度下低阶ODUk映射至ODTUCn.M对应的Cm和CnD的一种示意，其中表中为小数的Cm值是理论计算值，在实际传送中需要将该数取整传送，k＝2表示比特速率等级为10Gbit/s，k＝3表示比特速率等级为40Gbit/s，k＝4表示比特速率等级为100Gbit/s，k＝flex表示比特速率任意(表2中示意的ODUflex为1Tbit/s等级)。
表1
Figure PCTCN2015082675-appb-000001
表2
Figure PCTCN2015082675-appb-000002
Figure PCTCN2015082675-appb-000003
步骤202、根据所述预设的映射适配指示信息格式，将所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD放置在所述映射适配指示信息相应的比特位上，并将所述映射适配指示信息封装入所述ODTUCn.M开销区；
步骤201-202为上述步骤101的进一步实现方式，发送端设备计算待承载LO ODU的承载于ODTUCn.M中的数据实体的数量Cm(Cm，m＝M×g)，一个ODTUCn.M周期内传送待承载LO ODU的字节数量可以通过定时统计输入缓存的LO ODU的增量字节数，同时通过判断缓存的空满情况来得到具体的LO ODU的字节数量。可以通过公式
Figure PCTCN2015082675-appb-000004
计算待承载LO ODU的承载于ODTUCn.M中的数据实体的数量Cm，通过公式
Figure PCTCN2015082675-appb-000005
计算待承载LO ODU的时钟信息CnD。发送端设备根据上述映射适配指示信息格式将待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和待承载LO ODU的时钟信息CnD放置在映射适配指示信息相应的比特位上，并将映射适配指示信息封装入ODTUCn.M开销区，即放置在相应时隙的TSOH中。
步骤203、根据每一个所述待承载LO ODU在OPUCn中占用的时隙的数量M和所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g，通过所述预设的映射算法将各个所述待承载LO ODU分别以对应的所述映射粒度大小g映射至与所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm相同个数的所述ODTUCn.M净荷区中；
步骤203为上述步骤102的进一步实现方式，发送端设备通过预设的映射算法将Cm个映射粒度大小为g字节的待承载LO ODU数据映射至ODTUCn.M净荷区中，该预设的映射算法可以是∑-Δ算法。
步骤204、将所述ODTUCn.M净荷复用至所述OPUCn净荷区中，将 所述ODTUCn.M开销复用至所述OPUCn开销区中；
步骤205、基于所述OPUCn增加所述ODUCn开销区、所述OTUCn开销区以及所述帧头指示，封装形成所述OTUCn；
步骤204-205为上述步骤103的进一步实现方式，发送端设备将ODTUCn.M净荷复用至OPUCn净荷区中，将ODTUCn.M开销复用至OPUCn开销区中，即在OTUCn的OPUCn净荷区和OPUCn开销区中确定的承载ODTUCn.M的时隙中分别封装ODTUCn.M净荷区和ODTUCn.M开销区。基于OPUCn添加ODUCn开销区、OTUCn开销区及帧头指示区，形成最终的OTUCn帧。
步骤206、将所述OTUCn发送给接收端设备。
通过上述方法实施例，在OPUCn净荷区和OPUCn开销区中分别确定承载LO ODU的时隙，以及对应时隙开销区中填写的映射适配指示信息。
图8A为ODTUCn.M一个结构的示意图，如图8A所示，ODTUCn.M由10-OPUCn复帧中的ts个时隙及其对应的时隙开销组成，ts表示时隙个数，该ODTUCn.M的ODTUCn.M净荷区包含40行×(380×ts)列，ODTUCn.M开销区包含ts个时隙中的一个时隙对应的TSOH，该一个时隙可以选择为ts个时隙中编码最大的时隙所对应的时隙开销。
图8B为ODTUCn.M另一个结构的示意图，如图8B所示，ODTUCn.M由10-OPUCn复帧中的ts个时隙及其对应的时隙开销组成，ts表示时隙个数，该ODTUCn.M的ODTUCn.M净荷区包含40行×(380×ts)列，ODTUCn.M开销区包含ts个时隙对应的TSOH。
图9A为TSOH的一个格式示意图，如图9A所示，这种格式基于原有的GMP中的开销格式分配方式，利用保留比特表示分发明增加的信息。J1和J2用于存放待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm，C1～C14表示14个比特的Cm，J2的第7个比特放置增量指示(Increment Indicator，简称：II)，J2的第8个比特放置缩减指示(Decrement Indicator，简称：DI)；J3放置J1和J2字节的循环冗余校验码(Cyclic Redundancy Check，简称：CRC)-8校验信息；J4和J5的第4～8比特用于放置待承载LO ODU的时钟信息CnD，共10比特，D1～D10表示10个比特的CnD；J6的第4～8比特用于放置J4和J5的CRC-5校验信息；增加 分配J4的保留比特1～3用于放置映射适配类型。这种格式适用于图8A所示的ODTUCn.M结构。
图9B为TSOH的另一个格式示意图，如图9B所示，这种格式重新调整分配TSOH的6个字节。J1和J2用于存放待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm，C1～C14表示14个比特的Cm，J2的第7个比特放置II，J2的第8个比特放置DI；J3放置J1和J2字节的CRC-8校验信息；J4和J5的第1～2比特用于放置映射适配类型，共4比特；J4和J5的第3～8比特用于放置待承载LO ODU的时钟信息CnD，共12比特，D1～D12表示12个比特的CnD；J6字节放置J4和J5字节的CRC-8校验信息。这种格式适用于图8A所示的ODTUCn.M结构。
图9C为TSOH的又一个格式示意图，如图9C所示，这种格式扩展待承载LO ODU的时钟信息CnD的放置方式。J1和J2用于存放待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm，C1～C14表示14个比特的Cm，J2的第7个比特放置II，J2的第8个比特放置DI；J3放置J1和J2字节的CRC-8校验信息；J4和J5的第4～8比特用于放置待承载LO ODU的时钟信息之一CnD_ts，共10比特，D1～D10表示10个比特的CnD_ts；J6的第4～8比特用于放置J4和J5的CRC-5校验信息；增加J4字节的保留比特1～3用于放置映射适配类型。关于J4和J5的第4～8比特，具体来讲，即在ODTUCn.M第一个时隙对应的时隙开销中，放置待承载LO ODU的时钟信息之一CnD_1，共10比特，D1～D10表示10个比特的CnD_1；在ODTUCn.M第二个时隙对应的时隙开销中，放置待承载LO ODU的时钟信息之一CnD_2，共10比特，D1～D10表示10个比特的CnD_2；依次类推，直到第ts个时隙。因此待承载LO ODU的时钟信息为CnD＝CnD_1+CnD_2+…+CnD_ts。这种格式适用于图8B所示的ODTUCn.M结构。
本实施例，通过确定映射粒度并根据映射粒度生成映射适配指示信息以指示接收端设备进行相应的解映射，实现基于映射粒度的LO ODU向ODTUCn.M的映射，解决现有的固定的映射粒度情况下，承载了相同的LO ODU却采用了不同映射粒度的OTUCn在收发两端无法互通的问题。
需要说明的是，图9A～图9C所示的仅是TSOH结构的三种示例，其 他任何适用于JC1～JC6的各个比特的部署方式均可承载本发明的映射适配指示信息，对此不作具体限定。
图10为本发明光传输网的业务映射处理方法的又一个实施例的流程图，如图10所示，本实施例的方法可以包括：
步骤301、接收发送端设备发送的光通道传输单元OTUCn；
本实施例的执行主体可以是OTN中的接收端设备。接收端设备接收发送端设备发送的OTUCn。
步骤302、从所述OTUCn中获取光通道数据支路单元ODTUCn.M，所述ODTUCn.M包括ODTUCn.M开销区和ODTUCn.M净荷区；
步骤303、根据所述ODTUCn.M开销区中携带的映射适配指示信息和净荷结构指示PSI，确定映射粒度，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
接收端设备以与图1和图7所示方法实施例相反的步骤从OTUCn提取ODTUCn.M，即在OTUCn中的OPUCn净荷区和OPUCn开销区相应的时隙中获取ODTUCn.M净荷区和ODTUCn.M开销区，在ODTUCn.M开销区中解析出映射适配指示信息和净荷结构指示PSI，并确定映射粒度。
步骤304、根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU。
接收端设备根据映射适配指示信息和映射粒度从ODTUCn.M中解映射LO ODU。
本实施例，通过从开销区获取映射适配指示信息和映射粒度，从接收到的OTUCn中解映射ODTUCn.M获取LO ODU，实现基于映射粒度的ODTUCn.M向LO ODU的解映射，解决现有的固定的映射粒度情况下，承载了相同的LO ODU却采用了不用映射粒度的OTUCn在收发两端无法互通的问题。
接收端设备从OTUCn获取LO ODU的过程与发送端设备的从LO ODU映射至OTUCn的过程正好是相反的，因此在解映射的过程中，首先要获取映射适配指示信息和映射粒度，基于这两个信息即可在对应的时隙 上获取到LO ODU，解映射过程中涉及到的帧结构和上述方法实一致，此处不再赘述。
图11为本发明光传输网的业务映射处理方法的再一个实施例的流程图，如图11所示，本实施例的方法可以包括：
步骤401、接收发送端设备发送的光通道传输单元OTUCn；
步骤402、从所述OTUCn中获取光通道数据支路单元ODTUCn.M；
步骤403、根据所述ODTUCn.M开销区中携带的所述映射适配指示信息中的所述映射适配类型获取所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g；
步骤404、根据所述ODTUCn.M开销区中携带的所述PSI获取所述待承载LO ODU在OPUCn中占用的时隙的数量M；
步骤402-404为上述步骤303的进一步实现方式，其中步骤404的实现过程可以是：从ODTUCn.M开销区获取OMFI和PSI；根据所述OMFI识别所述OPUCn；根据所述PSI获取所述OPUCn的时隙被占用的情况；根据PSI确定待承载LO ODU在OPUCn中占用的时隙的数量M。
可选的，接收端设备确定映射粒度与预先配置的映射粒度是否一致，即确定映射粒度大小Cg与外部配置一致，该外部配置可以通过NMS或者T-SDN控制器配置，若不一致上报映射粒度不一致告警。
步骤405、解析所述映射适配指示信息获取所述ODTUCn.M中待解映射的所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述LO ODU的时钟信息CnD；
步骤406、根据所述LO ODU的映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及预设的映射算法从所述ODTUCn.M中解映射出所述LO ODU；
步骤407、根据所述LO ODU的映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及所述LO ODU的时钟信息CnD计算获取在一个ODTUCn.M周期内传送所述LO ODU的字节数量；
步骤408、根据所述在一个ODTUCn.M周期内传送所述LO ODU的字节数量恢复所述LO ODU的时钟信息。
步骤405-408为上述步骤304的进一步实现方式，接收端设备解析映射适配指示信息获取ODTUCn.M中待解映射的LO ODU的承载于 ODTUCn.M中的数据实体的数量Cm和LO ODU的时钟信息CnD，采用∑-Δ算法从ODTUCn.M解映射出LO ODU；再根据LO ODU所占用的时隙中每个时隙对应的映射粒度大小g，以及待解映射的LO ODU的承载于ODTUCn.M中的数据实体的数量Cm值和LO ODU的时钟信息CnD，获取一个ODTUCn.M周期内传送LO ODU的字节数量LOODU的字节数量＝CnD+Cm×M×g；根据LO ODU的字节数量恢复LO ODU的时钟信息。
本实施例，通过从开销区获取映射适配指示信息和映射粒度，从接收到的OTUCn中解映射ODTUCn.M获取LO ODU，实现基于映射粒度的ODTUCn.M向LO ODU的解映射，解决现有的固定的映射粒度情况下，承载了相同的LO ODU却采用了不用映射粒度的OTUCn在收发两端无法互通的问题。
图12为本发明发送端装置的一个实施例的结构示意图，如图12所示，本实施例的装置可以包括：指示信息生成模块11、映射模块12、封装模块13以及发送模块14，其中，指示信息生成模块11，用于根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；映射模块12，用于根据所述映射适配指示信息将所述待承载LO ODU映射至光通道数据支路单元ODTUCn.M中的ODTUCn.M净荷区，所述ODTUCn.M包括ODTUCn.M开销区和所述ODTUCn.M净荷区；封装模块13，用于将所述映射适配指示信息封装入所述ODTUCn.M开销区；将所述ODTUCn.M封装至光通道传输单元OTUCn；发送模块14，用于将所述OTUCn发送给接收端装置。
本实施例的装置，可以用于执行图1或图7所示方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
进一步的，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
进一步的，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于在所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU 的时钟信息CnD，所述数据实体的大小为M×g字节。
进一步的，所述指示信息生成模块11，具体用于根据所述所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm；根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的时钟信息CnD。
进一步的，所述指示信息生成模块11，还用于根据待承载的另一LO ODU的映射粒度生成另一映射适配指示信息，所述另一LO ODU的映射粒度为M1×g1字节，其中，M1为所述另一LO ODU在所述OPUCn中占用的时隙的数量，g1为所述另一LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g1为大于1的正整数，其中g1不等于g；所述映射模块12，还用于根据所述另一映射适配指示信息将所述另一LO ODU映射至ODTUCn.M1净荷区，所述ODTUCn.M1包括ODTUCn.M1开销区和ODTUCn.M1净荷区；所述封装模块13，还用于将所述另一映射适配指示信息封装入所述ODTUCn.M1开销区；将所述ODTUCn.M1封装至所述OTUCn。
进一步的，所述映射粒度由网络管理系统NMS或传输软件定义网络T-SDN控制器配置。
本实施例中的指示信息生成模块11、映射模块12、封装模块13可以通过中央处理器(Central Processing Unit，简称：CPU)实现，发送模块14可以通过发送器实现，而存储器中则存储代码程序和相关数据，CPU、发送器、存储器之间可以通过总线连接，其中，CPU用于从存储器中读取代码程序，执行图1或图7所示方法实施例的步骤，发送器用于向接收端设备发送承载了多种业务对应的LO ODU的OTUCn，具体的实现过程可参见上述实施例，此处不再赘述。
图13为本发明接收端装置的一个实施例的结构示意图，如图13所示，本实施例的装置可以包括：接收模块21、获取模块22、确定模块23以及 解映射模块24，其中，接收模块21，用于接收发送端设备发送的光通道传输单元OTUCn；获取模块22，用于从所述OTUCn中获取光通道数据支路单元ODTUCn.M，所述ODTUCn.M包括ODTUCn.M开销区和ODTUCn.M净荷区；确定模块23，用于根据所述ODTUCn.M开销区中携带的映射适配指示信息和净荷结构指示PSI，确定映射粒度，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；解映射模块24，用于根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU。
本实施例的装置，可以用于执行图10或图11所示方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
进一步的，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
进一步的，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
进一步的，所述确定模块23，具体用于根据所述映射适配指示信息获取所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g；根据所述PSI获取所述待承载LO ODU在OPUCn中占用的时隙的数量M。
进一步的，所述解映射模块24，具体用于解析所述映射适配指示信息获取所述ODTUCn.M中待解映射的所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述LO ODU的时钟信息CnD；根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及预设的映射算法从所述ODTUCn.M中解映射出所述LO ODU；根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及所述LO ODU的时钟信息CnD计算获取在一个ODTUCn.M周期内传送所述LO ODU的字节数量；根据所述在一个ODTUCn.M周期内传送所述LO ODU的字节数量恢复所述LO ODU的时 钟信息。
本实施例中的获取模块22、确定模块23以及解映射模块24可以通过CPU实现，接收模块21可以通过接收器实现，而存储器中则存储代码程序和相关数据，CPU、接收器、存储器之间可以通过总线连接，其中，接收器用于接收发送端设备发送的承载了多种业务对应的LO ODU的OTUCn，CPU用于从存储器中读取代码程序，执行图10或图11所示方法实施例的步骤，具体的实现过程可参见上述实施例，此处不再赘述。
图14为本发明光传输网的一个实施例的结构示意图，如图14所示，本实施例的系统包括：发送端装置11和接收端装置12；所述发送端装置11可以采用图12所示装置实施例的结构，其对应地，可以执行图1或图7所示方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述；所述接收端装置12可以采用图13所示装置实施例的结构，其对应地，可以执行图10或图11所示方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。图15为本发明收发两端的映射处理过程示意图，基于图14结构示意，即可实现在收发两端进行LO ODU与OTUCn之间的映射和解映射过程。
本发明需要根据映射粒度将LO ODU映射至ODTUCn.M，由于所示OPUCn单个时隙对应的映射粒度存在C64、C32、C16、C8等多种情况，因此为降低成本，需要考虑在同一电路中可以做到支持多种映射粒度的映射和解映射处理。
图16为快时钟处理下光传输网收发两端的一个电路结构示意图，如图16所示，C8时钟下同时支持1字节(C8)和4字节(C32)两种映射粒度，一个∑-Δ算法模块兼容这两种映射粒度的处理。当映射粒度为C8时，g＝1字节，∑-Δ算法根据得到的Cm值在C8时钟下计算映射图案，并生成对应缓存读使能指示，将LO ODU的数据从缓存中读出并按照ts字节粒度映射入ODTUCn.M净荷区；当映射粒度为C32时，g＝4字节，首先C32缺口GAP控制模块产生缺口控制信号，该缺口控制信号通过计数C8时钟上升沿产生，每4个上升沿产生一次有效指示，并将缺口控制信号送入∑-Δ算法模块，∑-Δ算法根据得到的Cm值在C8时钟下以及缺口控制信号有效的情况下计算映射图案，并生成对应缓存读使能指示，将LO ODU的数据 从缓存中读出并按照ts×4字节粒度映射入ODTUCn.M净荷区。
图17为慢时钟处理下光传输网收发两端的一个电路结构示意图，如图17所示，C32时钟下同时支持1字节(C8)和4字节(C32)两种映射粒度。四个∑-Δ算法模块兼容这两种映射粒度处理。当映射粒度为C32时，g＝4字节，只采用其中一个∑-Δ算法模块进行计算，该∑-Δ算法模块根据得到的Cm值在C32时钟下计算映射图案，并生成对应缓存读使能指示，将LO ODU的数据从缓存中读出并按照ts×4字节粒度映射入ODTUCn.M净荷区；当映射粒度为C8时，g＝1字节，采用4个∑-Δ算法模块同时进行计算，分别计算当前4个位置的映射图案，并分别生成对应缓存的读使能指示，将LO ODU的数据从缓存中读出并按照ts字节粒度映射入ODTUCn.M净荷区。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (23)

  1. 一种光传输网的业务映射处理方法，其特征在于，包括：
    根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
    根据所述映射适配指示信息将所述待承载LO ODU映射至光通道数据支路单元ODTUCn.M中的ODTUCn.M净荷区，所述ODTUCn.M包括ODTUCn.M开销区和所述ODTUCn.M净荷区；
    将所述映射适配指示信息封装入所述ODTUCn.M开销区；
    将所述ODTUCn.M封装至光通道传输单元OTUCn；
    将所述OTUCn发送给接收端设备。
  2. 根据权利要求1所述的方法，其特征在于，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
  3. 根据权利要求2所述的方法，其特征在于，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
  4. 根据权利要求3所述的方法，其特征在于，所述根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，包括：
    根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm；
    根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的时钟信息CnD。
  5. 根据权利要求1～4中任一项所述的方法，其特征在于，所述方法 还包括：
    根据待承载的另一LO ODU的映射粒度生成另一映射适配指示信息，所述另一LO ODU的映射粒度为M1×g1字节，其中，M1为所述另一LO ODU在所述OPUCn中占用的时隙的数量，g1为所述另一LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g1为大于1的正整数，其中g1不等于g；
    根据所述另一映射适配指示信息将所述另一LO ODU映射至ODTUCn.M1净荷区，所述ODTUCn.M1包括ODTUCn.M1开销区和ODTUCn.M1净荷区；
    将所述另一映射适配指示信息封装入所述ODTUCn.M1开销区；
    将所述ODTUCn.M1封装至所述OTUCn。
  6. 根据权利要求1～5中任一项所述的方法，其特征在于，所述映射粒度由网络管理系统NMS或传输软件定义网络T-SDN控制器配置。
  7. 一种光传输网的业务映射处理方法，其特征在于，包括：
    接收发送端设备发送的光通道传输单元OTUCn；
    从所述OTUCn中获取光通道数据支路单元ODTUCn.M，所述ODTUCn.M包括ODTUCn.M开销区和ODTUCn.M净荷区；
    根据所述ODTUCn.M开销区中携带的映射适配指示信息和净荷结构指示PSI，确定映射粒度，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
    根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU。
  8. 根据权利要求7所述的方法，其特征在于，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
  9. 根据权利要求8所述的方法，其特征在于，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大 小为M×g字节。
  10. 根据权利要求9所述的方法，其特征在于，所述根据所述ODTUCn.M开销区中携带的映射适配指示信息和净荷结构指示PSI，确定映射粒度，包括：
    根据所述映射适配指示信息中的所述映射适配类型获取所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g；
    根据所述PSI获取所述待承载LO ODU在OPUCn中占用的时隙的数量M。
  11. 根据权利要求10所述的方法，其特征在于，所述根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU，包括：
    解析所述映射适配指示信息获取所述ODTUCn.M中待解映射的所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述LO ODU的时钟信息CnD；
    根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及预设的映射算法从所述ODTUCn.M中解映射出所述LO ODU；
    根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及所述LO ODU的时钟信息CnD计算获取在一个ODTUCn.M周期内传送所述LO ODU的字节数量；
    根据所述在一个ODTUCn.M周期内传送所述LO ODU的字节数量恢复所述LO ODU的时钟信息。
  12. 一种发送端装置，其特征在于，包括：
    指示信息生成模块，用于根据待承载低阶光通道数据单元LO ODU的映射粒度生成映射适配指示信息，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
    映射模块，用于根据所述映射适配指示信息将所述待承载LO ODU映射至光通道数据支路单元ODTUCn.M中的ODTUCn.M净荷区，所述 ODTUCn.M包括ODTUCn.M开销区和所述ODTUCn.M净荷区；
    封装模块，用于将所述映射适配指示信息封装入所述ODTUCn.M开销区；将所述ODTUCn.M封装至光通道传输单元OTUCn；
    发送模块，用于将所述OTUCn发送给接收端装置。
  13. 根据权利要求12所述的装置，其特征在于，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
  14. 根据权利要求13所述的装置，其特征在于，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
  15. 根据权利要求14所述的装置，其特征在于，所述指示信息生成模块，具体用于根据所述所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm；根据所述待承载LO ODU在OPUCn中占用的时隙的数量M、所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g以及在一个ODTUCn.M周期内传送所述待承载LO ODU的字节数量计算获取所述待承载LO ODU的时钟信息CnD。
  16. 根据权利要求12～15中任一项所述的装置，其特征在于，所述指示信息生成模块，还用于根据待承载的另一LO ODU的映射粒度生成另一映射适配指示信息，所述另一LO ODU的映射粒度为M1×g1字节，其中，M1为所述另一LO ODU在所述OPUCn中占用的时隙的数量，g1为所述另一LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g1为大于1的正整数，其中g1不等于g；
    所述映射模块，还用于根据所述另一映射适配指示信息将所述另一LO ODU映射至ODTUCn.M1净荷区，所述ODTUCn.M1包括ODTUCn.M1开销区和ODTUCn.M1净荷区；
    所述封装模块，还用于将所述另一映射适配指示信息封装入所述 ODTUCn.M1开销区；将所述ODTUCn.M1封装至所述OTUCn。
  17. 根据权利要求12～16中任一项所述的装置，其特征在于，所述映射粒度由网络管理系统NMS或传输软件定义网络T-SDN控制器配置。
  18. 一种接收端装置，其特征在于，包括：
    接收模块，用于接收发送端设备发送的光通道传输单元OTUCn；
    获取模块，用于从所述OTUCn中获取光通道数据支路单元ODTUCn.M，所述ODTUCn.M包括ODTUCn.M开销区和ODTUCn.M净荷区；
    确定模块，用于根据所述ODTUCn.M开销区中携带的映射适配指示信息和净荷结构指示PSI，确定映射粒度，所述映射粒度为M×g字节，其中，M为所述待承载LO ODU在光通道净荷单元OPUCn中占用的时隙的数量，g为所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小，g为大于1的正整数；
    解映射模块，用于根据所述映射适配指示信息对所述ODTUCn.M进行解映射获取低阶光通道数据单元LO ODU。
  19. 根据权利要求18所述的装置，其特征在于，所述映射适配指示信息包括：映射适配类型，所述映射适配类型用于指示所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g。
  20. 根据权利要求19所述的装置，其特征在于，所述映射适配指示信息，还包括：所述待承载LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述待承载LO ODU的时钟信息CnD，所述数据实体的大小为M×g字节。
  21. 根据权利要求20所述的装置，其特征在于，所述确定模块，具体用于根据所述映射适配指示信息中的所述映射适配类型获取所述LO ODU所占用的时隙中每个时隙对应的映射粒度大小g；根据所述PSI获取所述待承载LO ODU在OPUCn中占用的时隙的数量M。
  22. 根据权利要求21所述的装置，其特征在于，所述解映射模块，具体用于解析所述映射适配指示信息获取所述ODTUCn.M中待解映射的所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm和所述LO ODU的时钟信息CnD；根据所述映射粒度、所述LO ODU的承载于所 述ODTUCn.M中的数据实体的数量Cm以及预设的映射算法从所述ODTUCn.M中解映射出所述LO ODU；根据所述映射粒度、所述LO ODU的承载于所述ODTUCn.M中的数据实体的数量Cm以及所述LO ODU的时钟信息CnD计算获取在一个ODTUCn.M周期内传送所述LO ODU的字节数量；根据所述在一个ODTUCn.M周期内传送所述LO ODU的字节数量恢复所述LO ODU的时钟信息。
  23. 一种光传输网，其特征在于，包括：发送端装置和接收端装置；所述发送端装置采用权利要求12～17中任一项所述的装置，所述接收端装置采用权利要求18～22中任一项所述的装置。
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