WO2016202296A1 - 数据承载的方法、装置以及数据解析的方法、装置 - Google Patents

数据承载的方法、装置以及数据解析的方法、装置 Download PDF

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Publication number
WO2016202296A1
WO2016202296A1 PCT/CN2016/086254 CN2016086254W WO2016202296A1 WO 2016202296 A1 WO2016202296 A1 WO 2016202296A1 CN 2016086254 W CN2016086254 W CN 2016086254W WO 2016202296 A1 WO2016202296 A1 WO 2016202296A1
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Prior art keywords
cpri
service
optical channel
unit
payload
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PCT/CN2016/086254
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English (en)
French (fr)
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苏伟
吴秋游
肖新
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华为技术有限公司
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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0071—Provisions for the electrical-optical layer interface

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to a data bearer method, apparatus, and data analysis method and apparatus.
  • the distributed base station separates the indoor baseband processing unit (BBU) from the radio remote unit (English: Radio Remote Unit, RRU), and between the BBU and the RRU. Connected via fiber optics. Therefore, the baseband data (hereinafter referred to as CPRI service) from the Common Public Radio Interface (CPRI) needs to be transmitted through an optical transport network (English: Optical Transport Network, OTN for short).
  • BBU indoor baseband processing unit
  • RRU Radio Remote Unit
  • CPRI service Common Public Radio Interface
  • the OTN network electrical layer technical specification defines three levels of optical channel units to implement different functions, namely, an optical channel payload unit (English: Optical Channel Payload Unit, referred to as OPUk), which provides a function of carrying a client signal; Optical Channel Data Unit (English: Optical Channel Data Unit, ODUk for short) provides maintenance and operation functions for the end-to-end transmission path; Optical Channel Transport Unit (English: Optical Channel Transport Unit, OTUk for short) provides point-to-point Network management functions at the optical channel transport unit level.
  • the coefficient k represents OPUk, ODUk and OTUk of different bit rates supported.
  • FIG. 1 is a schematic structural diagram of an OTUk frame structure including a Forward Error Correction (FEC), which includes 4 rows and 4080 columns, wherein the first 14 columns respectively provide frame synchronization.
  • FEC Forward Error Correction
  • FIG. 2 is a schematic diagram of an OPUk frame structure, which is the first 3824 column shown in FIG. 1, and only the main structure of the OPUk is shown in FIG. 2, that is, 15 columns to 3824 columns, that is, mainly including an OPU overhead area and OPU payload area.
  • CPRI defines a series of rates. According to the latest CPRI standard, it includes eight types of interfaces of CPRI option 1-8, and the corresponding rate is from 491.52 Mbit/s to 9830.4 Mbit/s. Eight encodings (before encoding) or from 614.4Mbit/s to 10137.6Mbit/s (after encoding).
  • the same tower often contains multiple types of base stations from multiple operators. Therefore, the same station has data bearer requirements for mixing and transmitting CPRI services of multiple different rates.
  • the CPRI service to be transmitted needs to be mapped to the low-order OPU, and the ODU overhead is added to form the low-order ODU (for ease of description, the process is simplified below).
  • To map the CPRI service to be transmitted to the low-order ODU and then map the low-order ODU service to the high-order optical channel data tributary unit (English: Optical Channel Data Tributary Unit, ODTU for short-term OPU),
  • the process is simplified below as being multiplexed by the low-order ODU service mapping to the high-order OPU.
  • the high-order OPU is added by the layer in the order of the ODU and the OTU to form a high-order OTU and then transmitted by the optical fiber.
  • the CPRI hybrid service to be transmitted is a hybrid service including CPRI options 1 to 8, as shown in FIG. 3, the following two processes are required to adopt the prior art solution: 1) For CPRI option1, CPRI option2, The generic mapping procedure (English: Generic Mapping Procedure, GMP for short) is mapped to ODU0; for CPRI option3, GMP is mapped to ODU1; for CPRI option 4 to 8, the Bit Synchronous Mapping Procedure (English: Bit Synchronous Mapping Procedure, for short: BMP) maps to ODUflex respectively.
  • GMP Generic Mapping Procedure
  • Multi-channel low-order ODU The services (ODU0, ODU1, or ODUflex) are multiplexed to the high-order OPU through GMP, and then the corresponding overhead is added through the layer layer to form a high-order OTU and transmitted.
  • the CPRI service has a high requirement for delay.
  • the required delay is large, which is disadvantageous for efficient and fast transmission of the CPRI service.
  • the present invention provides a data bearer method and apparatus, which can improve the bandwidth utilization of an OTN network.
  • the present invention provides a method for data bearer, the method comprising:
  • the received m-channel CPRI services are mapped to the m-channel optical channel data tributary unit in a one-to-one manner;
  • M channel optical channel data tributary unit carrying the CPRI service is multiplexed into a time slot of the optical channel payload unit;
  • the rate of the time slot is equal to the CPRI basic rate.
  • the method before the mapping the received m-channel CPRI service to the m-channel optical channel data tributary unit in a one-to-one manner, the method further include:
  • the optical channel payload unit including the first number of time slots is selected.
  • the selected optical channel payload unit is an optical channel payload unit with a preset rate of n times, and the n times pre-predetermined Rate-based optical channel payload unit consisting of n optical channel payload unit logic branches According to the preset byte interleave and multiplexing;
  • the single optical channel payload unit logical branch includes an overhead area and a payload area, and the payload area includes a preset second number of the time slots;
  • the value of the n is determined according to the ratio of the first quantity to the second quantity.
  • the preset rate is 10 Gbit/s or 12 Gbit/s.
  • any one of the first, second or third implementation manners of the first aspect, in the fourth implementation manner of the first aspect, the received m-channel CPRI service Mapping to the m-channel optical channel data tributary unit in a one-to-one manner including:
  • the CPRI service Determining, by the first path, the CPRI service as a reference clock service, where the first path CPRI service is any one of the m-channel CPRI services;
  • mapping the reference clock service and the CPRI service that uses the same clock source as the reference clock service into the optical channel data tributary unit by using a bit synchronization mapping procedure or a synchronous universal mapping procedure;
  • the CPRI services that use the different clock sources of the reference clock service are mapped into the optical channel data tributary unit in a one-to-one correspondence by the asynchronous universal mapping procedure.
  • any one of the first, second, third or fourth implementations of the first aspect in a fifth implementation of the first aspect, is multiplexed into the time slot of the optical channel payload unit, and the method further includes:
  • the multiplexing area indication is added to the overhead area of the frame structure of the optical channel payload unit whose value indicated by the multiframe indication is 2 to the maximum value indicated by the multiframe, and the multiplexing structure indication of the adjacent two frames is used to indicate whether the current time slot is used. ID of the CPRI service type, CPRI service, or CPRI service group carried in the current time slot.
  • the method further includes:
  • the at least two CPRI service bits or bytes are multiplexed into one serial bit stream.
  • a bandwidth of a single time slot in the optical channel payload unit is a bandwidth before encoding of the CPRI option 1;
  • the method further includes:
  • the method further includes: mapping the received m-channel CPRI service into the m-channel optical channel data tributary unit in a one-to-one manner, the method further includes:
  • pointer overhead information corresponding to each of the CPRI services, where the pointer overhead information is used to indicate that the start frame of each of the CPRI services after decoding is at a position of the corresponding optical channel data tributary unit;
  • the pointer overhead information is separately stored to an overhead area of the corresponding optical channel data tributary unit.
  • the method further includes: mapping the received m-channel CPRI service to the m-channel optical channel data tributary unit in a one-to-one manner, the method further includes:
  • the pointer The overhead information is used to indicate that the start frame of each of the CPRI services after decoding is at a position of the corresponding optical channel data tributary unit;
  • the pointer overhead information is stored in the multiplexing structure indication of the optical channel payload unit, respectively.
  • the method further includes:
  • Adding a CPRI start frame header overhead corresponding to each CPRI service where the CPRI start frame header overhead includes at least indicating a start frame of each of the CPRI services in the corresponding optical channel data branch.
  • the header of the location of the road unit indicates information.
  • the method further includes:
  • optical channel transmission unit overhead Adding the optical channel transmission unit overhead to the optical channel payload unit that has carried the m-channel CPRI service to form an optical channel transmission unit.
  • the CPRI basic rate is a multiple of a CPRI basic frame rate.
  • the CPRI basic rate is 491.52 Mbit/s or 614.4 Mbit/s.
  • the present invention provides a method for data parsing, the method comprising:
  • the service type is a CPRI hybrid service including the m-channel CPRI service, determining an m-channel optical channel data tributary unit corresponding to the m-channel CPRI service;
  • each optical channel data tributary unit Demultiplexing each optical channel data tributary unit according to mapping overhead information carried in each optical channel data tributary unit, and obtaining at least two CPRI basic frames corresponding to each CPRI service;
  • the acquiring, according to the information carried in the optical area of the optical channel payload unit, the service type carried by the optical channel payload unit specifically includes:
  • the determining the m optical path data tributary unit corresponding to the m-channel CPRI service Specifically include:
  • the Carrying the mapping overhead information, performing demapping processing on each optical channel data tributary unit, and obtaining at least two CPRI basic frames corresponding to each CPRI service specifically including:
  • mapping cost information carried in each optical channel data tributary unit of each channel Corresponding clock source information of each CPRI service;
  • the corresponding optical channel data tributary unit is demapped by a bit synchronization mapping procedure or a synchronous universal mapping procedure.
  • the CPRI service is a CPRI service that uses different clock sources from the reference clock service
  • the corresponding optical channel data tributary unit is demapped through an asynchronous universal mapping procedure.
  • the acquiring the CPRI service corresponding to each channel includes:
  • the frame header overhead of the CPRI starting frame corresponding to each CPRI service is identified, and the location information of the CPRI starting frame corresponding to each CPRI service is obtained.
  • the location information of the CPRI start frame corresponding to the service is obtained after all the CPRI basic frames starting from the CPRI start frame, and the method further includes:
  • the present invention also provides an apparatus for data bearer, the apparatus comprising:
  • a receiving unit configured to receive a m-channel universal public radio interface CPRI service, where m is an integer greater than one;
  • mapping unit configured to map the received m-channel CPRI services into the m-channel optical channel data tributary unit in a one-to-one manner
  • a multiplexing unit configured to multiplex the m optical channel data tributary unit carrying the CPRI service into a time slot of the optical channel payload unit
  • the rate of the time slot is equal to the CPRI basic rate.
  • the apparatus further includes Processing unit for:
  • the optical channel payload unit including the first number of time slots is selected.
  • the optical channel payload unit selected by the processing unit is an optical channel payload unit with a preset rate of n times.
  • the optical channel payload unit of the n times preset rate is formed by interpolating and multiplexing the n logical channels of the optical channel payload unit according to a preset byte;
  • the single optical channel payload unit logical branch includes an overhead area and a payload area, and the payload area includes a preset second number of the time slots;
  • the value of the n is determined according to the ratio of the first quantity to the second quantity.
  • mapping unit is specifically configured to:
  • the CPRI service Determining, by the first path, the CPRI service as a reference clock service, where the first path CPRI service is any one of the m-channel CPRI services;
  • mapping the reference clock service and the CPRI service that uses the same clock source as the reference clock service into the optical channel data tributary unit by using a bit synchronization mapping procedure or a synchronous universal mapping procedure;
  • the CPRI services that use the different clock sources of the reference clock service are mapped into the optical channel data tributary unit in a one-to-one correspondence by the asynchronous universal mapping procedure.
  • the multiplexing unit Also used for:
  • the multiplexing area indication is added to the overhead area of the frame structure of the optical channel payload unit whose value indicated by the multiframe indication is 2 to the maximum value indicated by the multiframe, and the multiplexing structure indication of the adjacent two frames is used to indicate whether the current time slot is used. Occupied, CPRI service type carried by the current time slot, CPRI The identity of the service or CPRI service group.
  • the device further includes a grouping unit, specifically for:
  • the at least two CPRI service bits or bytes are multiplexed into one serial bit stream.
  • a bandwidth of a single time slot in the optical channel payload unit is a bandwidth before encoding of the CPRI option 1;
  • the device further includes a decoding unit, specifically for:
  • mapping unit is further configured to:
  • pointer overhead information corresponding to each of the CPRI services, where the pointer overhead information is used to indicate that the start frame of each of the CPRI services after decoding is at a position of the corresponding optical channel data tributary unit;
  • the pointer overhead information is separately stored to an overhead area of the corresponding optical channel data tributary unit.
  • mapping unit is further configured to:
  • pointer overhead information corresponding to each of the CPRI services, where the pointer overhead information is used to indicate that the start frame of each of the CPRI services after decoding is at a position of the corresponding optical channel data tributary unit;
  • the processing unit is further configured to:
  • Adding a CPRI start frame header overhead corresponding to each CPRI service where the CPRI start frame header overhead includes at least indicating a start frame of each of the CPRI services in the corresponding optical channel data branch.
  • the header of the location of the road unit indicates information.
  • the multiplexing unit is further configured to:
  • optical channel transmission unit overhead Adding the optical channel transmission unit overhead to the optical channel payload unit that has carried the m-channel CPRI service to form an optical channel transmission unit.
  • the present invention also provides an apparatus for data parsing, the apparatus comprising:
  • An acquiring unit configured to acquire, according to information carried in the overhead area of the optical channel payload unit, a service type carried by the optical channel payload unit;
  • a determining unit configured to determine, when the service type is a CPRI hybrid service including an m-channel CPRI service, an m-channel optical channel data tributary unit corresponding to the m-channel CPRI service;
  • a demapping unit configured to perform demapping processing on each optical channel data tributary unit according to mapping overhead information carried in each optical channel data tributary unit, to obtain at least two CPRI basics corresponding to each CPRI service frame;
  • the acquiring unit is further configured to acquire location information of a CPRI start frame corresponding to each CPRI service, and obtain all CPRI basic frames starting from the CPRI start frame, where the CPRI start frame is the first CPRI basic frame.
  • the acquiring unit is specifically configured to:
  • the determining unit is specifically configured to:
  • the demapping unit is specifically configured to:
  • the corresponding optical channel data tributary unit is demapped by a bit synchronization mapping procedure or a synchronous universal mapping procedure.
  • the corresponding optical channel data tributary unit is demapped by an asynchronous universal mapping procedure.
  • the acquiring unit is specifically used to :
  • the frame header overhead of the CPRI starting frame corresponding to each CPRI service is identified, and the location information of the CPRI starting frame corresponding to each CPRI service is obtained.
  • the device further includes an encoding Unit, specifically for:
  • the present invention provides a network device, including: a processor, a memory, and a receiver; the memory is configured to store a computer execution instruction, and when the network device is running, the processor executes a computer-executed instruction of the memory storage to make the network
  • the apparatus performs the method as described in the first aspect and any one of the possible implementations of the first aspect.
  • the present invention provides a network device, including: a processor, a memory, and a receiver; the memory is configured to store a computer to execute an instruction, and when the network device is in operation, the processor executes a computer-executed instruction of the memory storage to make the network
  • the apparatus performs the method of any one of the possible implementations of the second aspect and the second aspect.
  • the method and the device for data bearer provided by the present invention after receiving the n-channel CPRI service, directly multiplex the n-channel CPRI service mapping into the OPU, and in the prior art, the CPRI service needs to be first mapped to the low-order ODU.
  • the present invention can implement the bearer of the CPRI service by using the first-level mapping, and can reduce the delay caused by the two-level mapping, thereby enabling the fast bearer of the CPRI service.
  • the method and device for data parsing provided by the present invention correspond to the method for data bearer at the transmitting end, and only one demapping is required, and the delay required for demapping can be reduced, thereby enabling fast extraction of CPRI services.
  • FIG. 1 is a schematic structural diagram of an OTU frame structure provided in the prior art
  • FIG. 2 is a schematic structural diagram of an OPU frame structure provided in the prior art
  • FIG. 3 is a schematic flowchart of a method for carrying a CPRI service according to the prior art
  • FIG. 4 is a schematic flowchart of a method for data bearer according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a second method for data bearer according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a single-channel OPULL frame structure and time slot division according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of multiplexing one channel OPULL by one-byte multiplexing to form one channel OPU according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of a time slot storage sequence when an OPU consisting of n-way OPULLs carries data according to an embodiment of the present invention
  • FIG. 9 is a schematic flowchart diagram of a method for carrying a third data bearer according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic flowchart diagram of a method for adding a payload structure indication according to an embodiment of the present disclosure
  • 11 is a schematic diagram of storage of a payload type and a multiplexing structure indication of a multiframe composed of 256 OPU frames according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of indicating, by an adjacent two multiplexing structures, an occupation situation of a same time slot and a carried CPRI service situation according to an embodiment of the present disclosure
  • FIG. 13 is a schematic flowchart diagram of a fourth method for data bearer according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic diagram of a specific application of the data bearing method provided in FIG. 13;
  • FIG. 15 is a schematic flowchart diagram of a fifth method for data bearer according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic flowchart diagram of a sixth method for data bearer according to an embodiment of the present disclosure.
  • FIG. 17 is a schematic diagram of storage of pointer overhead according to an embodiment of the present invention.
  • FIG. 18 is a schematic flowchart diagram of a seventh method for data bearer according to an embodiment of the present disclosure.
  • FIG. 19 is a schematic diagram of another pointer overhead storage according to an embodiment of the present invention.
  • FIG. 20 is a schematic flowchart of a method for an eighth data bearer according to an embodiment of the present invention.
  • FIG. 21 is a schematic diagram of adding a CPRI start frame header indication according to an embodiment of the present invention.
  • FIG. 22 is a schematic diagram of mapping a CPRI superframe data stream with an indication of a CPRI start frame header to an ODTU according to an embodiment of the present invention
  • FIG. 23 is a schematic flowchart diagram of a method for ninth data bearer according to an embodiment of the present disclosure.
  • FIG. 24 is a schematic flowchart diagram of a tenth method for data bearer according to an embodiment of the present disclosure.
  • FIG. 25 is a schematic diagram of a specific application for mapping a multiplexing of a hybrid CPRI service to an OPU according to an embodiment of the present disclosure
  • FIG. 26 is a schematic flowchart diagram of a first method for data parsing according to an embodiment of the present invention.
  • FIG. 27 is a schematic flowchart diagram of a second method for data parsing according to an embodiment of the present disclosure.
  • FIG. 29 is a schematic flowchart diagram of a fourth method for data parsing according to an embodiment of the present disclosure.
  • FIG. 30 is a schematic flowchart diagram of a fifth method for data parsing according to an embodiment of the present disclosure.
  • FIG. 31 is a schematic flowchart diagram of a sixth method for data parsing according to an embodiment of the present disclosure.
  • FIG. 32 is a schematic flowchart diagram of a seventh method for data parsing according to an embodiment of the present disclosure.
  • FIG. 33 is a schematic structural diagram of an apparatus for carrying data according to a first embodiment of the present invention.
  • FIG. 34 is a schematic structural diagram of a device for carrying data according to a second embodiment of the present invention.
  • FIG. 35 is a schematic structural diagram of an apparatus for carrying a third type of data according to an embodiment of the present disclosure.
  • FIG. 36 is a schematic structural diagram of a fourth device for data bearer according to an embodiment of the present disclosure.
  • FIG. 37 is a schematic structural diagram of an apparatus for analyzing data according to an embodiment of the present invention.
  • FIG. 38 is a schematic structural diagram of a second apparatus for data parsing according to an embodiment of the present disclosure.
  • FIG. 39 is a schematic structural diagram of a device for carrying a fifth type of data according to an embodiment of the present disclosure.
  • FIG. 40 is a schematic structural diagram of an apparatus for analyzing a third data according to an embodiment of the present invention.
  • the embodiment of the invention provides a method for data bearer, which is applied to a transmitting end in an optical transport network.
  • the data referred to in the embodiment of the present invention is mainly a CPRI hybrid service including at least two CPRI services.
  • the method for data bearer provided by the embodiment of the present invention, as shown in FIG. 4, includes:
  • the mapping mode may be BMP mapping (Bit Synchronous Mapping Procedure, BMP for short) or BGMP mapping (BGMP).
  • BMP mapping Bit Synchronous Mapping Procedure, BMP for short
  • BGMP mapping BGMP mapping
  • ASN mapping English: Asynchronous Generic Mapping Procedure, AGMP for short
  • the mapping mode can be determined according to the type of the CPRI service and the clock source. For details, refer to the following.
  • the mapping referred to in this step is a one-to-one mapping process, that is, one channel CPRI service is mapped into one ODTU. Therefore, the number of ODTUs is the same as the number of channels of the CPRI service included in the CPRI hybrid service to be carried.
  • the mapping overhead information needs to be added to the slot overhead positions JC1 to JC6 of the ODTU.
  • the CPRI data stream is mapped into the ODTU by a fixed Cm value, and Cm information is added to the JC1.
  • ⁇ JC3 For AGMP mapping processing, it is necessary to collect the CPRI service traffic to be mapped in real time, and generate a corresponding Cm value and clock information CnD.
  • the Cm value is used to indicate the number of the CPRI services to be carried in a single ODTU period, and the unit is m bits.
  • the CnD value is used to indicate that the CPRI service to be carried in a single ODTU period is to be compared with the previous ODTU period.
  • the amount of change of the CPRI service carried in units of n bits.
  • the clock information CnD is used by the receiving end to restore the original CPRI service clock according to the clock information CnD and perform CPRI service processing.
  • the m-channel optical channel data tributary unit carrying the CPRI service is multiplexed into a time slot of the optical channel payload unit.
  • step 102 the multiple ODTUs in step 102 are multiplexed into one OPU.
  • the rate of the time slot is equal to the CPRI basic rate.
  • the base rate can be a multiple of the CPRI basic frame rate.
  • the rate of the CPRI basic frame is 3.84 MHz.
  • the basic frame sizes of different types of CPRI services are different, and the rates of different types of CPRI services are also different. For example, if the basic frame size of CPRI Option 1 is 128 bits, the corresponding rate is 491.52 Mbit/s.
  • the CPRI basic frame rate of the basic rate of the CPRI is 128 times, that is, the rate of the CPRI option 1 is 491.52 Mbit/s (before the 8B/10B encoding) or 614.4. Mbit/s (using 8B/10B After coding).
  • the following is an example of the CPRI basic rate of the CPRI option 1 as an example, and the present application is not limited.
  • Table 1 shows the correspondence between the rate encoding before and after encoding of different types of CPRI services (CPRI option 1 to 8) and the basic rate of CPRI (the rate of CPRI option 1).
  • the data bearer method provided by the present invention after receiving the n-channel CPRI service, directly multiplexes the n-channel CPRI service mapping into the OPU, and in the prior art, the CPRI service needs to be first mapped to the low-order ODU and then remapped.
  • the present invention can implement the bearer of the CPRI service by using the first-level mapping, and can reduce the delay caused by the two-level mapping, thereby enabling the fast bearer of the CPRI service.
  • the bandwidth occupied by the low-order ODU can be reduced, and the bandwidth utilization can be improved.
  • the rate of a single time slot of the OPUk in the prior art is 1.25 Gbit/s.
  • the rate of a single time slot of the OPUk in the prior art is 1.25 Gbit/s.
  • the CPRI option 1 service and the CPRI option 2 service are mapped to the ODU0 at the first level, the payload rate of the ODU0 is not fully used, and bandwidth is wasted.
  • the CPRI option3 service is mapped to the ODU1 at the first level, the payload rate of the ODU1 is not fully used, and bandwidth is wasted.
  • the present invention pre-configures an OPU that includes different numbers of time slots, that is, OPUs of different bandwidths, and selects the required OPU according to the rate of the multiple CPRI services to be carried. Therefore, as a supplement to the method shown in FIG. 4, before step 101 "maps the received m-channel CPRI services in a one-to-one manner into the m-channel optical channel data tributary unit", as shown in FIG. 5, The method also includes:
  • this step calculating a ratio of a total rate of the mixed CPRI service to be carried to a rate of the single time slot, if the ratio is an integer value, the first quantity is a value; if If the ratio is a non-integer value, the value obtained by adding 1 to the ratio is the first quantity.
  • the CPRI hybrid service to be carried is a hybrid service including a CPRI option1, a 2-channel CPRI option2, and a 5-channel CPRI option4, and the corresponding relationship between the CPRI services and the basic rate shown in Table 1 can be obtained.
  • the frame structure of the OPU selected in this step is an optical channel payload unit with a preset rate of n times, and the optical channel payload unit of the n times preset rate is composed of n optical channels.
  • Payload unit logic branch (English: Optical Channel Payload Unit Logic Lane (abbreviation: OPULL) is formed by interpolating and multiplexing the preset bytes. Its frame structure size is 4 rows and 3824n columns.
  • the single optical channel payload unit logical branch includes an overhead area and a payload area, and the payload area includes a second preset number of the time slots.
  • the value of the n is determined according to the ratio of the first quantity to the second quantity.
  • the process is specifically: obtaining a ratio of the first quantity to the second preset quantity, and if the ratio is an integer value, using the integer value as the number of required OPULLs; if the ratio is not an integer value, The integer value obtained by rounding up the ratio is taken as the number of required OPULLs.
  • the number of required OPULLs is five, and thus the selected OPU is included. 5 OPULL OPUs.
  • the number of required OPULLs is three, and thus the selected OPU contains three OPULLs. OPU.
  • the frame structure and time slot division of the OPU can be seen later in detail.
  • the first number of time slots are directly selected.
  • the number of OPUs can be.
  • the pre-configuration process of the OPU is to divide the frame structure of the OPU, so that the frame structures of different OPUs have the same size, but the number of slots included is different, so that the included time slots can be selected according to the CPRI service to be carried.
  • the OPU provided by the present invention includes one or more time slots with a basic rate of CPRI, the slot granularity is small, and the number of slots matches the CPRI service to be carried. Therefore, the bandwidth of the OPU provided by the embodiment of the present invention can be effectively utilized to improve the bandwidth utilization.
  • the OPU is an optical channel payload unit with a preset rate of n times, and the OPU of the n times preset rate includes n OPULLs.
  • the value of n is determined according to the total bandwidth of the m-channel CPRI service, and the bandwidth of a single OPULL is the preset rate, and a single OPULL frame.
  • the size of the structure may be the same size as the prior art, that is, 4 rows and 3824 columns, a single OPULL includes an overhead area and a payload area, the overhead area includes a single overhead of the OPULL, and the payload area includes a second pre- Set the number of slots.
  • the optical channel payload unit of the n times preset rate is formed by the logical branch of the n optical channel payload units according to a preset byte interleave multiplexing, and the specific interpolated multiplexing refers to the frame structure of the OPU.
  • the overhead area and the payload area are included, and the overhead area is formed by interpolating and multiplexing each of the OPULL overhead areas according to a preset byte; the payload area is followed by the preset word by the OPULL payload area of each path. Sections are formed by interleaving multiplexing.
  • the optimal carrying capacity of a single OPULL is between 10 Gbit/s and 12 Gbit/s. Therefore, if the rate of selecting a single time slot is 491.52 Mbit/s before encoding, the second preset number may be 24, and the preset rate of the corresponding single OPULL is about 12 Gbit/s; the second preset number is The value can also be 20, and the corresponding preset rate of a single OPULL is about 10 Gbit/s. If the rate of selecting a single time slot is 614.4 Mbit/s, the second preset number may be 20, and the preset rate of the corresponding single OPULL is about 12 Gbit/s.
  • the OPU consisting of n-channel OPULLs can be named OPUXn, where "X” is a Roman numeral, indicating 10G; when the bandwidth of a single OPULL is 12Gbit/s, it can be n-way.
  • the OPU consisting of OPULL is named OPUXIIn, where "XII” is a Roman numeral, indicating 12G. Whether 12G or 10G is just an approximation, it does not represent an accurate rate value.
  • adding an ODU overhead to the OPU can form an ODU
  • adding an ODU to the OTU overhead area can form an OTU.
  • Table 2 of the following table shows the payload area rate of OPUXIIn and the rate of ODUXIIn/OTUXIIn when the rates of a single time slot are 491.52 Mbit/s and 614.4 Mbit/s, respectively.
  • the rate of ODUXIIn/OTUXIIn is 239/238 times the OPUXIIn payload area rate because the ODUXIIn/OTUXIIn contains an additional 16n column overhead area relative to the OPUXIIn payload area.
  • the frame structure and time slot division of a single OPULL are as follows: the frame structure of a single OPULL is the first to fourth rows, the 15th column to the 3824th column, a total of 4 rows. *3810 columns, including 15 to 16 columns of two columns of overhead areas and 17 columns to 3824 columns of 3808 columns of payload areas, wherein the overhead area is used to store time slot overhead, PSI and multiframe indications; The section is divided into 24 time slots for granularity.
  • Fig. 6 shows a 24-multiframe composed of 24 frames of the above OPULL, and the structure of each frame is the same.
  • the above slot granularity is selected as a single byte because the bandwidth of a single time slot is not too large; if the bandwidth of a single time slot is large, for example: 2.5 Gbit/s, the time of the payload area
  • the slot division granularity can also be multi-byte.
  • the n-channel OPULL can be multiplexed by single-byte or multi-byte to form one channel of the whole signal, that is, one channel of the OPU signal.
  • the frame structure of the OPU formed by multiplexing the n-channel OPULL by single-byte multiplexing specifically, the (14n+1) to 16n columns of the first to fourth rows are the overhead areas of the OPU, and the n-channel OPULL is used.
  • the overhead area is multiplexed in a single byte.
  • the (16n+1) to 3824n columns in the first to fourth rows are the payload areas of the OPU, and the payload area of the n-channel OPULL is multiplexed in a single byte.
  • the corresponding OPU payload area (16n+1 to 3824n columns) is divided into 24n time slots.
  • the time slot number is TS AB (where A is a single OPULL signal number, and the value can be 1...n; B is the number of each time slot in the single channel OPULL, and the value is 1...24; that is, the time in the OPU
  • the slots are numbered 1.1, 2.1, ..., n.1, 1.2, 2.2, ... until n.24).
  • FIG. 6 and FIG. 7 are described in the single-channel OPULL frame structure starting from the 15th column or the frame structure of the OPU from the 15th column, because the first 14 columns (one-way OPULL) are used.
  • the first 14n column (the OPU composed of n-channel OPULL) adds the ODU overhead and the OTU overhead, and further can constitute the frame structure of the ODU frame and the frame structure of the OTU frame.
  • the first line The 1 ⁇ 7n column indicates the overhead of the frame header
  • the (7n+1) to 14n columns in the first row are the overhead areas of the OTU
  • the 1 ⁇ 14n columns in the second to fourth rows are the overhead areas of the ODU.
  • the frame structure of the OPU including the n-way OPULL provided by the embodiment of the present invention may also be divided into a check area and not included. There are two types of check areas.
  • bandwidth of a single time slot is set to 614.4 Mbit/s after encoding
  • a single-channel OPULL frame structure of the same size can be used, and the bandwidth of the single-channel OPULL still takes about 12 Gbit/s, the difference lies only in
  • the bandwidth of a single time slot and the payload area of a single OPULL are divided into 20 time slots instead of 24 time slots, and correspondingly 20 OPULL frames can be formed into 20-multiframes.
  • the specific implementation process is similar to the process in which the bandwidth of a single time slot is 491.52 Mbit/s before encoding and 24 time slots are divided, and details are not described in this embodiment.
  • the bearer sequence is TS1.1, TS2.1, and TS1.2.
  • the number of slots included in each ODTU payload area and the number of slots required for the corresponding CPRI service it is necessary to calculate the CPRI service for each channel.
  • the ratio of the rate to the rate of the single time slot If the ratio is an integer value, the ratio is taken as the number of slots corresponding to the path of the CPRI service; if the ratio is a non-integer value, the ratio is incremented by one. The value obtained after rounding is used as the number of slots corresponding to the CPRI service of the path.
  • the CPRI service to be carried is a hybrid service including a CPRI option1, a 2-channel CPRI option2, and a 5-channel CPRI option4, and the corresponding relationship between the CPRI services and the basic rate shown in Table 1 can be obtained.
  • the bandwidth of CPRI option1 is 1 times the basic rate, and the corresponding first number is 1; the bandwidth of each CPRI option2 is 2 times the basic rate, then the two channels of CPRI option2 correspond to
  • the first number of the CPRI option4 is 5 times the basic rate, and the first number corresponding to the 5 channels of CPRI option4 are 5, 5, 5, 5, 5, and 5, respectively.
  • step 102 maps the received m-channel CPRI services into the m-channel optical channel data tributary unit in a one-to-one manner", which may be adopted according to the CPRI service to be carried.
  • the clock source adopts a corresponding mapping method, as shown in FIG. 9, the process specifically includes:
  • the lowest rate CPRI service can be selected as the reference clock service.
  • step 103 "the m-channel optical channel data tributary unit carrying the CPRI service is multiplexed into the time slot of the optical channel payload unit", and the net needs to be increased.
  • the specific information of the payload structure identifier (English: payload structure identifier, PSI for short) includes a payload type indication (English: payload type, abbreviated as PT) and a multiplexing structure indication (English: Multiplex structure identifier: MSI).
  • the PT is used to indicate that the service carried by the current OPU payload area is a CPRI hybrid service;
  • the MSI is used to indicate the bearer status of each time slot of the OPU, for example, the occupation of each time slot, if a time slot is occupied, The type of CPRI service or CPRI service group carried by the time slot, and the identification number of the CPRI service or CPRI service group.
  • the corresponding added payload structure indication as shown in FIG. 10, specifically includes:
  • the frame structure of one OPU includes n OPULLs, and 256 of the OPUs
  • the frame structure is composed of one 256-multiframe, as shown in FIG. 11, the complete frame structure of one of the above OPUs (shown above the dotted line) and the 256-multiframe of the frame structure of 256 of the OPUs are shown.
  • a partial overhead area corresponding to each frame shown below the dotted line; wherein the indicated partial overhead area refers to only the 4th row, 14n+1 column to 15n, 1 row and n columns of each frame.
  • the overhead area that is, the specific stored information of the PSI part of each frame. 0 to 255 is the number of each OPU frame, that is, the multiframe indication.
  • the payload type PT referred to in this step is located in the overhead area of the OPU whose value indicated by the multi-frame is 0, that is, the PSI of the first OPULL corresponding to the frame structure of the OPU whose multi-frame indicates a value of 0 is PT; RES indicates a reserved bit.
  • the value of the multiframe indication is 2, and the value of the multiframe indication is 255.
  • the PSI of the 254 OPU frames stores the multiplexing structure indication overhead MSI, and each frame carries n multiplexing structures to indicate overhead. Used to indicate the occupancy of each time slot, and so on.
  • FIG. 12 shows the specific meanings of the adjacent two MSIs of two adjacent frames for indicating the occupation of the same time slot, the CPRI service condition of the bearer, and the like.
  • the occupancy of one time slot is indicated by every 2 bytes.
  • the first bit of the previous frame indicates whether the time slot is occupied, 0 indicates occupation, and 1 indicates idle;
  • the second bit-5bit has 4 bits indicating the type of CPRI service carried, for example, 0000 indicates CPRI Option1,0001 indicates CPRI Option 2,... , 0111 indicates that CPRI Option 8, 1000 ⁇ 1111 is reserved for future higher rate CPRI service types, such as CPRI Option 9, etc.; 6th to 8th bits of the previous frame and 8 bits of the next frame, 11 bits, indicating the CPRI service ID. Or CPRI business group ID.
  • the number of time slots occupied by the corresponding CPRI service group and the CPRI service type can be known to be included in the CPRI service group. The number of CPRI services.
  • step 102 maps the received m-channel CPRI services in a one-to-one manner to the m-channel optical channel data tributary unit.
  • the method further includes a process of grouping CPRI services to be carried, so that only one group of multiplexed CPRI services needs to be centrally monitored and managed after multiplexing, and the process is specifically:
  • the determined group of services includes at least two CPRI services, multiplexing the at least two CPRI service bits or bytes into one serial bit stream.
  • the bearer of the CPRI service may be performed according to step 102 to step 103.
  • one serial bit stream can be regarded as a CPRI service.
  • FIG. 14 is a schematic diagram of a specific bearer process after grouping multiple CPRI services according to the processes of step 501 and step 502.
  • the 1 m reference clock source channel and the same clock source and the same service type is a service multiplexing CPRI CPRI traffic channel, then using the mapped BGMP ODTU BMP or mapped to a routing of the time slots TS 1 In the figure (shown as ODTU.ts 1 in the figure); similarly, the CP 2 services with the same clock source and the same service type are multiplexed into one CPRI service and then mapped to a route ts 2 by AGMP mapping.
  • ODTU consisting of slots (shown in FIG ODTU.ts 2); the m i source path with the same clock and the same service type is a service multiplexing CPRI CPRI traffic channel and then using the mapping mode is mapped to a AGMP Route ts into the ODTU composed of i slots (shown as ODTU.ts i in the figure); then multiplex the multiple ODTUs into one OPU.
  • the bandwidth of a single time slot in the optical channel payload unit can be the bandwidth before CPRI Option 1 encoding.
  • the CPRI service to be carried is generally a coded service, and therefore the CPRI service to be carried is first decoded.
  • step 102 "takes the received m-channel CPRI service in one-to-one Before the mode is mapped to the m-channel optical channel data tributary unit, as shown in FIG. 15, the method further includes:
  • This decoding process is the inverse of the encoding method shown in Table 1. Different types of CPRI services can be obtained after decoding. Table 3 below shows the codeword size and basic frame size of CPRI basic frames corresponding to different types of CPRI services:
  • the rate of each type of CPRI service can be obtained, which is consistent with that shown in Table 1.
  • step 102 "the received m-channel CPRI service is mapped into the m-channel optical channel data tributary unit in a one-to-one manner", as shown in FIG.
  • the method further includes:
  • the pointer overhead information is used to indicate that the start frame of each of the CPRI services after decoding is at the location of the corresponding optical channel data tributary unit.
  • consecutive 256 CPRI basic frames form a CPRI superframe
  • the first frame CPRI basic frame of the CPRI superframe is also the starting frame
  • the position of the starting frame in the ODTU is recorded and the pointer overhead is generated.
  • Information (English: Basic Frame Pointer, referred to as: BFP).
  • the pointer overhead information may be placed in the overhead area of the ODTU. As shown in FIG. 17, the ODTU is divided into 2 bytes for each time slot as an overhead area of each time slot. If the ODTU includes ts time slots, the corresponding The overhead area includes a total of 2*ts bytes, which can be used to place pointer overhead information; the remaining part is the payload area that maps the CPRI service. In addition, JC1 to JC6 for placing mapping overhead are also shown in the figure, and ODTU.ts is used to indicate that the ODTU is composed of ts time slots.
  • the pointer overhead information may also be stored in the multiplexing structure indication of the optical channel payload unit, respectively.
  • the process includes:
  • pointer overhead information is placed on the MSI based on 256 multiframes composed of 256 frames of OPUs.
  • each time slot corresponds to 4 bytes, and the first two bytes are also used to indicate that the TS is occupied; Two bytes are used to place pointer overhead information.
  • This directly maps the CPRI service into the entire payload area of the ODTU.
  • the part for placing the pointer overhead (the overhead area of the ODTU or the MSI of the OPU) is further used to add a delay measurement overhead, which is used for recording the internal processing of the device and the line transmission delay of the CPRI frame. Time.
  • the pointer overhead letter is added in the overhead area of the ODTU or the overhead area of the OPU.
  • the way to indicate the location of the CPRI start frame can also indicate the location of the CPRI start frame by adding a frame header indication overhead for the start frame of the CPRI service.
  • step 601 is performed after step 601, and of course, step 601 may not be performed.
  • the CPRI service that has not entered the optical transport network for bearer is carried by the CPRI basic frame, and 256 CPRI basic frames constitute a CPRI superframe, and the first CPRI basic frame in the CPRI superframe can also be called a CPRI start frame.
  • Each CPRI service corresponds to one or more consecutive CPRI superframes.
  • the frame header overhead may specifically include a CPRI start frame frame header indication, a check information, and a transmission delay measurement overhead.
  • each 256-CPRI superframe contains 8 bytes of overhead information, including a 4-byte CPRI superframe header indication (eg 0xf6f62828), a 1-byte BIP8 check, and a 2-byte delay.
  • the CPRI superframe data stream to which the frame header overhead is added is directly mapped into the ODTU.
  • the rate of OTUXIIn can be further accurately expressed as shown in Table 4.
  • the pointer overhead information is used, and each time slot corresponds to a 2-byte overhead area, so the passage (15232/15230) 2 *491.52
  • the value calculated by Mbit/s is used as the bandwidth of the time slot.
  • the pointer overhead information is placed in the OPU overhead area, the original payload area of the ODTU is not occupied, so it is calculated by (15232/15230)*491.52 Mbit/s.
  • the obtained value is used as the basic bandwidth of the time slot; in the third method, since the 8-byte frame header overhead information is directly added on the basis of each CPRI superframe, 492.5 Mbit/s is selected as the basic bandwidth of the time slot, and the relative bandwidth is 491.52 Mbit. /s increases the rate to ensure that the ODTU can carry the CPRI service with the indication information of the CPRI superframe header.
  • the step 103 “multiplexes the m optical path data tributary unit carrying the CPRI service into the time slot of the optical channel payload unit", as shown in FIG.
  • the method further includes:
  • 1001 Add the optical channel transmission unit overhead of the optical channel payload unit that has carried the m-channel CPRI service to form an optical channel transmission unit.
  • the CPRI service to be carried is sent by the BBU/RRU to the RRU/BBU, it is a point-to-point transmission. Therefore, it is not necessary to increase the ODU overhead information, and the OTU overhead can be directly added to form an OTU.
  • the method further includes:
  • 1102 Add an optical channel transmission unit overhead to the optical channel transmission unit to form an optical channel transmission unit.
  • the bandwidth of a single time slot is An example of the mapping is 614.4 Mbit/s.
  • the embodiment of the present invention provides a specific mapping process. If the CPRI service to be carried includes CPRI3, CPRI7, and CPRI8, each channel is 1. Then, based on the CPRI encoded basic rate, the OPU is constructed for data bearer, which is about 40 times the basic rate, and thus contains 40 time slots.
  • CPRI3 occupies 4 time slots, for example: TS1.1, TS2.1, TS1.8, TS2.8;
  • CPRI7 occupies 16 time slots, such as TS1.3, TS1.4, TS1.5, TS1 .6, TS1.7, TS1.9, TS1.10, TS1.11, TS1.12, TS1.13, TS1.14, TS1.15, TS1.16, TS1.17, TS1.18, TS1.19 ,;
  • CPRI8 occupies 20 time slots, such as TS2.1, TS1.2, TS2.2, TS2.3, TS2.4, TS2.5, TS2.6, TS2.7, TS2.8, TS2.9 , TS2.10, TS2.11, TS2.12, TS2.13, TS2.14, TS2.15, TS2.16, TS2.17, TS2.18, TS2.19, TS1.20, TS2.20.
  • the embodiment of the present invention further provides a data parsing method, where the method is applied to a receiving end in an optical transport network, as shown in FIG. 26, the method includes:
  • the service type is a CPRI hybrid service including the m-channel CPRI service
  • the method for data parsing provided by the embodiment of the present invention corresponds to the method for data bearer at the transmitting end, and only needs to be demapped once, and the delay required for demapping can be reduced, thereby enabling efficient and fast extraction of CPRI services.
  • step 1201 according to the optical channel
  • the information carried in the overhead area of the payload unit is obtained by the optical channel payload unit, as shown in FIG.
  • Step 1202 “Determining an n-channel optical channel data tributary unit corresponding to the m-channel CPRI service”, as shown in FIG.
  • step 1203 “de-mapping each optical channel data tributary unit according to the mapping overhead information carried in each optical channel data tributary unit, and obtaining each path
  • At least two CPRI basic frames corresponding to the CPRI service specifically include:
  • the corresponding optical channel data tributary unit is solved by using a bit synchronization mapping procedure or a synchronous universal mapping procedure. Mapping processing.
  • the CPRI service is a CPRI service that uses different clock sources from the reference clock service, perform demapping processing on the corresponding optical channel data tributary unit by using an asynchronous universal mapping procedure.
  • step 1204 “acquiring the location information of the CPRI start frame corresponding to each CPRI service”, specifically obtaining the pointer overhead information corresponding to each CPRI service, CPRI start frame corresponding to CPRI service Location information.
  • step 1204 “the location information of the CPRI start frame corresponding to the CPRI service is obtained, and all the CPRI basic frames from the start of the CPRI frame are obtained,” as shown in FIG.
  • step 1204 “acquiring the location information of the CPRI start frame corresponding to each CPRI service”, specifically identifying the frame header overhead of the CPRI starting frame corresponding to each CPRI service, and obtaining the CPRI corresponding to each CPRI service of each channel. The position information of the starting frame.
  • step 1204 “the location information of the CPRI start frame corresponding to the CPRI service is obtained, and all the CPRI basic frames from the start of the CPRI frame are obtained,” as shown in FIG. 31, which specifically includes:
  • the CPRI start frame is the first CPRI basic frame.
  • step 1204 "acquiring the location information of the CPRI start frame corresponding to each CPRI service, and obtaining all CPRI basic frames starting from the CPRI start frame", as shown in FIG.
  • the method further includes:
  • the transmitting end performs the decoding process on the original CPRI service
  • the receiving end needs to encode the CPRI service, for example, the CPRI option 1-7 service performs the encoding of the 8B/10B.
  • the CPRI option8 service performs 64B/66B encoding processing.
  • the embodiment of the present invention further provides A device for data bearing, the device being applied to a transmitting end in an optical transport network, as shown in FIG. 33, the device comprising:
  • the receiving unit 101 is configured to receive an m-way universal public radio interface CPRI service, where m is an integer greater than 1.
  • the mapping unit 102 is configured to map the received m-channel CPRI services into the m-channel optical channel data tributary unit in a one-to-one manner.
  • the multiplexing unit 103 is configured to multiplex the m optical channel data tributary unit carrying the CPRI service into a time slot of the optical channel payload unit;
  • the rate of the time slot is equal to the CPRI basic rate.
  • the apparatus further includes a processing unit 201, configured to determine a time slot required for the m-channel CPRI service according to a rate of each of the CPRI services and a rate of a single of the time slots.
  • the optical channel payload unit including the first number of time slots is selected.
  • the optical channel payload unit selected by the processing unit 201 is an optical channel payload unit with a preset rate of n times, and the optical channel payload unit of the n times preset rate is composed of n optical channel payloads.
  • the unit logic branch is formed by interpolating and multiplexing the preset bytes;
  • the single optical channel payload unit logical branch includes an overhead area and a payload area, and the payload area includes a second predetermined number of the time slots;
  • the value of the n is determined according to the ratio of the first quantity to the second quantity.
  • mapping unit 102 is specifically configured to: determine, by the first path, the CPRI service as a reference clock service, where the first path of the CPRI service is any one of the at least two channels of CPRI services;
  • mapping the reference clock service and the CPRI service that uses the same clock source as the reference clock service into the optical channel data tributary unit by using a bit synchronization mapping procedure or a synchronous universal mapping procedure;
  • the CPRI services that use the different clock sources of the reference clock service are mapped into the optical channel data tributary unit in a one-to-one correspondence by the asynchronous universal mapping procedure.
  • the multiplexing unit 103 is further configured to:
  • the overhead area of the frame structure of the optical channel payload unit whose value indicated by the multiframe is 0 is increased.
  • a payload type indication where the payload type indication is used to indicate that the service type currently carried by the optical channel payload unit is a multi-channel CPRI service;
  • the multiplexing area indication is added to the overhead area of the frame structure of the optical channel payload unit whose value indicated by the multiframe indication is 2 to the maximum value indicated by the multiframe, and the multiplexing structure indication of the adjacent two frames is used to indicate whether the current time slot is used. ID of the CPRI service type, CPRI service, or CPRI service group carried in the current time slot.
  • the apparatus further includes a grouping unit 301, specifically configured to:
  • the at least two CPRI service bits or bytes are multiplexed into one serial bit stream.
  • the bandwidth of the single time slot in the optical channel payload unit is the bandwidth before the encoding of the CPRI option 1; as shown in FIG. 36, the apparatus further includes a decoding unit 401, configured to perform the m-channel CPRI to be carried. The service is decoded to obtain the decoded m-channel CPRI service.
  • mapping unit 102 is further configured to:
  • pointer overhead information corresponding to each of the CPRI services, where the pointer overhead information is used to indicate that the start frame of each of the CPRI services after decoding is at a position of the corresponding optical channel data tributary unit;
  • mapping unit 102 is further configured to generate pointer overhead information corresponding to each of the CPRI services, where the pointer overhead information is used to indicate that the start frame of each CPRI service after decoding is corresponding.
  • the pointer overhead information is stored in the multiplexing structure indication of the optical channel payload unit, respectively.
  • processing unit 201 is further configured to separately add a CPRI start frame header overhead corresponding to each CPRI service, where the CPRI start frame header overhead includes at least indicating the CPRI service for each path.
  • the starting frame is in the corresponding optical channel data branch
  • the header of the location of the road unit indicates information.
  • the multiplexing unit 103 is further configured to add the optical channel transmission unit overhead of the optical channel payload unit that has carried the m-channel CPRI service to form an optical channel transmission unit.
  • the device for data bearer provided by the present invention directly maps the n-channel CPRI service to the OPU after receiving the n-channel CPRI service.
  • the CPRI service needs to be first mapped to the low-order ODU.
  • the present invention can implement the bearer of the CPRI service by using the first-level mapping, and can reduce the delay caused by the two-level mapping, thereby enabling the fast bearer of the CPRI service.
  • the embodiment of the present invention further provides a device for data parsing, where the device is applied to a receiving end in an optical transport network, where the optical transport network includes an optical channel payload unit, and the optical The channel payload unit includes at least one time slot, and the bandwidth of the single time slot is a general public wireless interface CPRI basic rate.
  • the apparatus includes:
  • the obtaining unit 601 is configured to acquire, according to the information carried in the overhead area of the optical channel payload unit, the service type carried by the optical channel payload unit.
  • the determining unit 602 is configured to determine, when the service type is a CPRI hybrid service including the m-channel CPRI service, an m-channel optical channel data tributary unit corresponding to the m-channel CPRI service.
  • the demapping unit 603 is configured to perform demapping processing on each optical channel data tributary unit according to the mapping overhead information carried in each optical channel data tributary unit, to obtain at least two CPRIs corresponding to each CPRI service. Basic frame.
  • the acquiring unit 601 is further configured to acquire location information of a CPRI start frame corresponding to each CPRI service, and obtain all CPRI basic frames starting from the CPRI start frame, where the CPRI start frame is first. CPRI basic frames.
  • the obtaining unit 601 is specifically configured to:
  • determining unit 602 is specifically configured to:
  • the demapping unit 603 is specifically configured to:
  • the corresponding optical channel data tributary unit is demapped by a bit synchronization mapping procedure or a synchronous universal mapping procedure.
  • the corresponding optical channel data tributary unit is demapped by an asynchronous universal mapping procedure.
  • the acquiring unit 601 is specifically configured to:
  • the frame header overhead of the CPRI starting frame corresponding to each CPRI service is identified, and the location information of the CPRI starting frame corresponding to each CPRI service is obtained.
  • the apparatus further includes: an encoding unit 701, configured to perform encoding processing on all CPRI basic frames corresponding to each of the CPRI services.
  • the device for data analysis provided by the present invention corresponds to the method for data bearer at the transmitting end, and only needs to be demapped once, which can reduce the delay required for demapping, and thus can Efficient and efficient extraction of CPRI services.
  • an embodiment of the present invention further provides a device for data bearer, where the device is applied to a transmitting end in an optical transport network, and the device, as shown in FIG. 39, includes a receiver. 801.
  • the receiver 801, the memory 802, the processor 803, and the transmitter 804 are connected by a bus 805, where:
  • the receiver 801 is configured to receive an m-way universal public radio interface CPRI service, where m is an integer greater than 1.
  • the memory 802 is configured to map the received m-channel CPRI services into the m-channel optical channel data tributary unit in a one-to-one manner.
  • the memory 802 is further configured to multiplex the m optical channel data tributary unit carrying the CPRI service into a time slot of the optical channel payload unit; wherein the rate of the time slot is equal to the CPRI basic rate.
  • the processor 803 is configured to determine, according to a rate of each of the CPRI services and a rate of a single time slot, a first number of time slots required for the m-channel CPRI service;
  • the optical channel payload unit including the first number of time slots is selected.
  • the optical channel payload unit selected by the processor 803 is an optical channel payload unit with a preset rate of n times, and the optical channel payload unit of the n times preset rate is composed of n optical channel payloads.
  • the unit logic branch is formed according to a preset byte interleave multiplexing; a single optical channel payload unit logical branch includes an overhead area and a payload area, and the payload area includes a second preset number of the time slots; The value of n is determined according to the ratio of the first quantity to the second quantity.
  • the processor 803 is further configured to determine the first path of the CPRI service as a reference clock service, where the first path CPRI service is any one of the at least two CPRI services.
  • the memory 802 is further configured to pass the reference clock service and the CPRI service that uses the same clock source as the reference clock service by using a bit synchronization mapping procedure or synchronization.
  • the CPRI services that use the different clock sources of the reference clock service are mapped into the optical channel data tributary unit in a one-to-one correspondence by the asynchronous universal mapping procedure.
  • the memory 802 is further configured to add a payload type indication, where the payload type indication is used to represent the light, in an overhead area of a frame structure of an optical channel payload unit whose value of the multi-frame indication is 0.
  • the service type currently carried by the channel payload unit is a multi-channel CPRI service;
  • the multiplexing area indication is added to the overhead area of the frame structure of the optical channel payload unit whose value indicated by the multiframe indication is 2 to the maximum value indicated by the multiframe, and the multiplexing structure indication of the adjacent two frames is used to indicate whether the current time slot is used. ID of the CPRI service type, CPRI service, or CPRI service group carried in the current time slot.
  • processor 803 is further configured to: determine at least one CPRI service that uses the same clock source and has the same service type as a group of services;
  • the at least two CPRI service bits or bytes are multiplexed into one serial bit stream.
  • the bandwidth of the single time slot in the optical channel payload unit is the bandwidth before the encoding of the CPRI option 1; the processor 801 is further configured to decode the m-channel CPRI service to be carried, and obtain the decoded The m-channel CPRI service.
  • the memory 802 is further configured to generate pointer overhead information corresponding to each of the CPRI services, where the pointer overhead information is used to indicate that each of the decoded start frames of the CPRI service is corresponding.
  • the pointer overhead information is separately stored to an overhead area of the corresponding optical channel data tributary unit.
  • the memory 802 is further configured to generate pointer overhead information corresponding to each of the CPRI services, where the pointer overhead information is used to indicate that each of the decoded start frames of the CPRI service is corresponding.
  • the pointer overhead information is stored in the multiplexing structure indication of the optical channel payload unit, respectively.
  • the processor 803 is further configured to separately add a CPRI start frame header overhead corresponding to each CPRI service, where the CPRI start frame header overhead includes at least A header indication information indicating a start frame of each of the CPRI services at a position of the corresponding optical channel data tributary unit.
  • the memory 802 is further configured to add a delay measurement overhead in an overhead area of the optical channel data tributary unit or a multiplexing structure indication of the optical channel payload unit.
  • the memory 802 is further configured to add an optical channel transmission unit overhead to the optical channel payload unit that has carried the m-channel CPRI service to form an optical channel transmission unit.
  • the transmitter 804 is configured to send the optical channel transmission unit carrying the CPRI service to the transmitting end through the optical fiber.
  • the memory 802 also stores the code required for execution of the processor 803.
  • the device for data bearer provided by the present invention directly maps the n-channel CPRI service to the OPU after receiving the n-channel CPRI service.
  • the CPRI service needs to be first mapped to the low-order ODU.
  • the present invention can implement the bearer of the CPRI service by using the first-level mapping, and can reduce the delay caused by the two-level mapping, thereby enabling the fast bearer of the CPRI service.
  • the embodiment of the present invention further provides a data parsing apparatus, where the method is applied to a receiving end in an optical transport network, and the apparatus, as shown in FIG. 40, includes a receiver. 901, the processor 902, the memory 903 and the bus 904, the receiver 901, the processor 902, and the memory 903 are connected by a bus 904, wherein:
  • the receiver 901 is configured to receive an optical channel transmission unit that carries the CPRI service and is sent by the sending end.
  • the processor 902 is configured to parse the optical channel transmission unit to obtain an optical channel payload unit.
  • the processor 902 is further configured to carry according to an overhead area of the optical channel payload unit.
  • the service type is a CPRI hybrid service including the m-channel CPRI service, determining an m-channel optical channel data tributary unit corresponding to the m-channel CPRI service;
  • each optical channel data tributary unit Demultiplexing each optical channel data tributary unit according to mapping overhead information carried in each optical channel data tributary unit, and obtaining at least two CPRI basic frames corresponding to each CPRI service;
  • the processor 901 is further configured to acquire the payload type indication information carried in the overhead area of the optical channel payload unit, and obtain the optical channel payload unit according to the payload type indication information. business type.
  • the processor 901 is further configured to acquire the payload structure indication information carried in the overhead area of the optical channel payload unit, and obtain each time of the optical channel payload unit according to the payload structure indication information. Whether the slot is occupied and the type of CPRI service carried by the occupied time slot and the identifier of the CPRI service;
  • processor 901 is further configured to obtain, according to mapping overhead information carried in each optical channel data tributary unit, clock source information of each CPRI service;
  • the corresponding optical channel data tributary unit is demapped by a bit synchronization mapping procedure or a synchronous universal mapping procedure.
  • the CPRI service is a CPRI service that uses different clock sources from the reference clock service
  • the corresponding optical channel data tributary unit is demapped through an asynchronous universal mapping procedure.
  • the processor 901 is further configured to obtain pointer overhead information corresponding to each CPRI service, and obtain a location of a CPRI start frame corresponding to each CPRI service. information.
  • the frame header overhead of the CPRI starting frame corresponding to each CPRI service is identified, and the location information of the CPRI starting frame corresponding to each CPRI service is obtained.
  • the processor 901 is further configured to perform encoding processing on all CPRI basic frames corresponding to each of the CPRI services.
  • the memory 903 is also used to store code required for execution of the processor 902.
  • the device for data parsing provided by the present invention corresponds to the method for data bearer at the transmitting end, and only needs to be demapped once, and the delay required for demapping can be reduced, thereby enabling efficient and fast extraction of CPRI services.
  • processors 803 and 902 in the embodiments of the present invention may be a processor or a collective name of multiple processing elements.
  • the processors 801 and 901 may be a Central Processing Unit (CPU), or may be an Application Specific Integrated Circuit (ASIC), or be configured to implement an embodiment of the present invention.
  • a plurality of integrated circuits such as one or more digital signal processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).
  • DSPs digital signal processors
  • FPGAs Field Programmable Gate Arrays
  • the memories 802 and 903 may be one storage device or a collective name of a plurality of storage elements, and are used to store executable program codes and the like. And the memories 802 and 903 may include random access memory (RAM), and may also include non-volatile memory such as a magnetic disk memory, a flash memory, or the like.
  • RAM random access memory
  • non-volatile memory such as a magnetic disk memory, a flash memory, or the like.
  • the bus 805 and the bus 904 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the buses 805 and 904 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figures 39 and 40, but it does not mean that there is only one bus or one type of bus.
  • the present invention can be implemented by means of software plus necessary general hardware, and of course hardware, but in many cases the former is a better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a hard disk or optical disk, etc. includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

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Abstract

本发明公开了一种数据承载的方法、装置以及数据解析的方法、装置，涉及光通信技术领域，为了解决现有技术中存在的时延较大的问题而发明。其中，数据承载的方法包括：接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数；将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中；将携带了CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中；其中，所述时隙的速率等于CPRI基本速率。本发明应用在CPRI业务的传送过程中。

Description

数据承载的方法、装置以及数据解析的方法、装置 技术领域
本发明涉及光通信技术领域，尤其涉及数据承载的方法、装置以及数据解析的方法、装置。
背景技术
目前，分布式基站的应用越来越广泛。与传统宏基站相比，分布式基站将室内基带处理单元(英文：Building Base band Unit，简称BBU)和射频拉远单元(英文：Radio Remote Unit，简称：RRU)相分离，BBU和RRU之间通过光纤连接。因而，来自通用公共无线接口(英文：Common Public Radio Interface，简称：CPRI)的基带数据(下文简称CPRI业务)需要通过光传送网(英文：Optical Transport Network，简称：OTN)传送。其中，OTN网络电层技术规范定义了三个层次的光通道单元以实现不同的功能，分别为光通道净荷单元(英文：Optical Channel Payload Unit，简称：OPUk)，提供客户信号承载的功能；光通道数据单元(英文：Optical Channel Data Unit，简称：ODUk)，提供端到端传送路径的维护和操作功能；光通道传输单元(英文：Optical Channel Transport Unit，简称：OTUk)，提供点到点光通道传送单元级别的网络管理功能。其中，系数k表示所支持的不同比特速率的OPUk，ODUk和OTUk。k＝1表示比特速率等级为2.5Gbit/s，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。如图1所示为一种包含校验区(英文：Forward Error Correction，简称：FEC)的OTUk帧结构的结构示意图，其包括4行4080列，其中，前14列分别包括用于提供帧同步定位的功能的帧定位序列(英文：Frame Alignment  Signal，简称:FAS)、ODUk开销(英文：overhead简称：OH)区以及OTUk开销区；15列和16列为OPUk开销区；17列至3824列为OPU净荷区；3825至4080列为校验区。如图2所示为OPUk帧结构的示意图，其为图1中所示的前3824列，图2中仅示出了OPUk的主要结构，即15列至3824列，即主要包括OPU开销区和OPU净荷区。
CPRI作为一种通用的标准接口，定义了一系列速率，根据最新的CPRI标准，其包括CPRI option 1～8共八种类型的接口，对应的速率为从491.52Mbit/s到9830.4Mbit/s(编码前)或从614.4Mbit/s到10137.6Mbit/s共八种速率(编码后)。实际应用中，由于2G、3G和4G网络共存，同一铁塔往往会包含多个运营商的多种类型基站，因而同一站点存在混合传送多种不同速率的CPRI业务的数据承载需求。
现有技术中，在利用OTN网络进行CPRI混合业务的传送过程中，首先需要将待传输的CPRI业务映射到低阶OPU，添加ODU开销构成低阶ODU(为了便于描述，下文将该过程简化描述为将待传输的CPRI业务映射到低阶ODU)；再将低阶ODU业务映射到高阶光通道数据支路单元(英文：Optical channel Data Tributary Unit，简称ODTU)中后复用为高阶OPU，(为了便于描述，下文将该过程简化描述为由低阶ODU业务映射复用至高阶OPU)再将高阶OPU按照ODU、OTU的顺序通过层层添加相应开销最终形成高阶OTU后由光纤传送。
例如：当前待传输的CPRI混合业务为包括CPRI option1～8的混合业务时，如图3所示，采用现有技术的方案需要经过下述两个过程：1)对于CPRI option1、CPRI option2，通过通用映射规程(英文：Generic Mapping Procedure，简称：GMP)分别映射到ODU0；对于CPRI option3通过GMP映射到ODU1；对于CPRI option4～8，则通过比特同步映射规程(英文：Bit Synchronous Mapping Procedure，简称：BMP)分别映射到ODUflex。2)将多路低阶ODU (ODU0、ODU1、或ODUflex)业务通过GMP复用到高阶OPU，然后经过层层添加相应开销最终形成高阶OTU并发送。
经发明人研究发现，CPRI业务对时延要求较高，而现有技术中在将各CPRI业务通过OTN网络传送时，所需的时延较大，因而不利于CPRI业务的高效快速传输。
发明内容
本发明提供一种数据承载的方法及装置，能够提高OTN网络的带宽的利用率。
为达到上述目的，本发明采用如下技术方案：
第一方面，本发明提供了一种数据承载的方法，所述方法包括：
接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数；
将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中；
将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中；
其中，所述时隙的速率等于CPRI基本速率。
结合第一方面，在第一方面的第一种实现方式中，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中之前，所述方法还包括：
根据每路所述CPRI业务的速率和单个所述时隙的速率，确定所述m路CPRI业务所需要的时隙的第一数量；
选取包含所述第一数量的时隙的所述光通道净荷单元。
结合第一方面的第一种实现方式，在第一方面的第二种实现方式中，选取的所述光通道净荷单元为n倍预设速率的光通道净荷单元，所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路 按照预设字节间插复用形成；
单个所述光通道净荷单元逻辑支路包括开销区和净荷区，净荷区包括预设的第二数量的所述时隙；
所述n的取值根据所述第一数量与第二数量的比值确定。
结合第一方面的第二种实现方式，在第一方面的第三种实现方式中，所述预设速率为10Gbit/s或12Gbit/s。
结合第一方面、第一方面的第一种、第二种或者第三种实现方式中的任意一种，在第一方面的第四种实现方式中，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中，具体包括：
将第一路所述CPRI业务确定为参考时钟业务，所述第一路CPRI业务为所述m路CPRI业务中的任意一路；
将所述参考时钟业务以及与所述参考时钟业务采用相同时钟源的CPRI业务通过比特同步映射规程或者同步通用映射规程一一对应的映射入所述光通道数据支路单元中；
将与所述参考时钟业务采用不同时钟源的CPRI业务通过异步通用映射规程一一对应的映射入所述光通道数据支路单元中。
结合第一方面、第一方面的第一种、第二种、第三种或者第四种实现方式中的任意一种，在第一方面的第五种实现方式中，所述将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中的同时，所述方法还包括：
在复帧指示的值为0的光通道净荷单元的帧结构的开销区增加净荷类型指示，所述净荷类型指示用于表示所述光通道净荷单元当前承载的业务类型为多路CPRI业务；
在复帧指示的值为2至复帧指示的最大值的光通道净荷单元的帧结构的开销区增加复用结构指示，相邻的两帧的复用结构指示用于表示当前时隙是否被占用、当前时隙承载的CPRI业务类型、CPRI业务或CPRI业务组的标识。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种或者第五种实现方式中的任意一种，在第一方面的第六种实现方式 中，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中之前，所述方法还包括：
将采用相同时钟源且业务类型相同的至少一路CPRI业务确定为一组业务；
如果确定出的一组业务中包括至少两路CPRI业务，则将所述至少两路CPRI业务比特或字节复用为一路串行比特流。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种、第五种实现或者第六种实现方式中的任意一种，在第一方面的第七种实现方式中，所述光通道净荷单元中单个时隙的带宽为CPRI选项1编码前的带宽；
所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中之前，所述方法还包括：
对待承载的所述m路CPRI业务进行解码，得到解码后的所述m路CPRI业务。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种、第五种实现、第六种或者第七种实现方式中的任意一种，在第一方面的第八种实现方式中，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中的同时，所述方法还包括：
分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至对应的光通道数据支路单元的开销区。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种、第五种实现、第六种或者第七种实现方式中的任意一种，在第一方面的第九种实现方式中，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中的同时，所述方法还包括：
分别生成与每路所述CPRI业务对应的指针开销信息，所述指针 开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至所述光通道净荷单元的复用结构指示中。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种、第五种实现、第六种或者第七种实现方式中的任意一种，在第一方面的第十种实现方式中，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元之前，所述方法还包括：
分别添加与每路CPRI业务对应的CPRI起始帧帧头开销，所述CPRI起始帧帧头开销至少包括用于指示每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置的帧头指示信息。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种、第五种实现、第六种、第七种、第八种、第九种或者第十种实现方式中的任意一种，在第一方面的第十一种实现方式中，所述将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中之后，所述方法还包括：
将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道传输单元开销，构成光通道传输单元。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种、第五种实现、第六种、第七种、第八种、第九种、第十种或者第十一种实现方式中实现方式中的任意一种，在第一方面的第十二种实现方式中，所述CPRI基本速率为CPRI基本帧速率的倍数。
结合第一方面、第一方面的第一种、第二种、第三种实现、第四种、第五种实现、第六种、第七种、第八种、第九种、第十种、第十一种或者第十二种实现方式中实现方式中的任意一种，在第一方面的第十三种实现方式中，所述CPRI基本速率为491.52Mbit/s或614.4Mbit/s。
第二方面，本发明提供了一种数据解析的方法，所述方法包括：
根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型；
当所述业务类型为包括m路CPRI业务的CPRI混合业务时，确定与所述m路CPRI业务一一对应的m路光通道数据支路单元；
根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧；
获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
结合第二方面，在第二方面的第一种实现方式中，所述根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型，具体包括：
获取所述光通道净荷单元的开销区携带的净荷类型指示信息，根据所述净荷类型指示信息，得到所述光通道净荷单元承载的业务类型。
结合第二方面或者第二方面的第一种实现方式，在第二方面的第二种实现方式中，所述确定与所述m路CPRI业务一一对应的m路光通道数据支路单元，具体包括：
获取所述光通道净荷单元的开销区携带的净荷结构指示信息，根据所述净荷结构指示信息得到所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识；
根据所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识，识别与所述m路CPRI业务一一对应的m路光通道数据支路单元。
结合第二方面、第二方面的第一种或者第二种实现方式中的任意一种，在第二方面的第三种实现方式中，所述根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧，具体包括：
根据每路所述光通道数据支路单元中携带的映射开销信息，得到 对应的每路CPRI业务的时钟源信息；
如果所述CPRI业务为所述参考时钟业务或者与所述参考时钟业务采用相同时钟源的CPRI业务，则通过比特同步映射规程或者同步通用映射规程对对应的光通道数据支路单元进行解映射处理；
如果所述CPRI业务为与所述参考时钟业务采用不同时钟源的CPRI业务，则通过异步通用映射规程对对应的光通道数据支路单元进行解映射处理。
结合第二方面、第二方面的第一种、第二种或者第三种实现方式中的任意一种，在第二方面的第四种实现方式中，所述获取每路所述CPRI业务对应的CPRI起始帧的位置信息，具体包括：
获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧的位置信息；
或者
识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息。
结合第二方面、第二方面的第一种、第二种、第三种或者第四种实现方式中的任意一种，在第二方面的第五种实现方式中，获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧之后，所述方法还包括：
对每路所述CPRI业务对应的所有CPRI基本帧进行编码处理。
第三方面，本发明还提供了一种数据承载的装置，所述装置包括：
接收单元，用于接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数；
映射单元，用于将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中；
复用单元，用于将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中；
其中，所述时隙的速率等于CPRI基本速率。
结合第三方面，在第三方面的第一种实现方式中，所述装置还包 括处理单元，用于：
根据每路所述CPRI业务的速率和单个所述时隙的速率，确定所述m路CPRI业务所需要的时隙的第一数量；
选取包含所述第一数量的时隙的所述光通道净荷单元。
结合第三方面的第一种实现方式，在第三方面的第二种实现方式中，所述处理单元选取的所述光通道净荷单元为n倍预设速率的光通道净荷单元，所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路按照预设字节间插复用形成；
单个所述光通道净荷单元逻辑支路包括开销区和净荷区，净荷区包括预设的第二数量的所述时隙；
所述n的取值根据所述第一数量与第二数量的比值确定。
结合第三方面、第三方面的第一种实现方式或者第二种实现方式中的任意一种，在第三方面的第三种实现方式中，所述映射单元，具体用于：
将第一路所述CPRI业务确定为参考时钟业务，所述第一路CPRI业务为所述m路CPRI业务中的任意一路；
将所述参考时钟业务以及与所述参考时钟业务采用相同时钟源的CPRI业务通过比特同步映射规程或者同步通用映射规程一一对应的映射入所述光通道数据支路单元中；
将与所述参考时钟业务采用不同时钟源的CPRI业务通过异步通用映射规程一一对应的映射入所述光通道数据支路单元中。
结合第三方面、第三方面的第一种实现方式、第二种实现方式或者第三种实现方式中的任意一种，在第三方面的第四种实现方式中，所述复用单元，还用于：
在复帧指示的值为0的光通道净荷单元的帧结构的开销区增加净荷类型指示，所述净荷类型指示用于表示所述光通道净荷单元当前承载的业务类型为多路CPRI业务；
在复帧指示的值为2至复帧指示的最大值的光通道净荷单元的帧结构的开销区增加复用结构指示，相邻的两帧的复用结构指示用于表示当前时隙是否被占用、当前时隙承载的CPRI业务类型、CPRI 业务或CPRI业务组的标识。
结合第三方面、第三方面的第一种实现方式、第二种实现方式、第三种实现方式或者第四种实现方式中的任意一种，在第三方面的第五种实现方式中，所述装置还包括分组单元，具体用于：
将采用相同时钟源且业务类型相同的至少一路CPRI业务确定为一组业务；
当确定出的一组业务中包括至少两路CPRI业务时，将所述至少两路CPRI业务比特或字节复用为一路串行比特流。
结合第三方面、第三方面的第一种实现方式、第二种实现方式、第三种实现方式、第四种或者第五种实现方式中的任意一种，在第三方面的第六种实现方式中，所述光通道净荷单元中单个时隙的带宽为CPRI选项1编码前的带宽；
所述装置还包括解码单元，具体用于：
对待承载的所述m路CPRI业务进行解码，得到解码后的所述m路CPRI业务。
结合第三方面、第三方面的第一种、第二种、第三种、第四种、第五种或者第六种实现方式中的任意一种，在第三方面的第七种实现方式中，所述映射单元，还用于：
分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至对应的光通道数据支路单元的开销区。
结合第三方面、第三方面的第一种、第二种、第三种、第四种、第五种或者第六种实现方式中的任意一种，在第三方面的第八种实现方式中，所述映射单元，还用于：
分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至所述光通道净荷单元的复用结 构指示中。
结合第三方面、第三方面的第一种、第二种、第三种、第四种、第五种或者第六种实现方式中的任意一种，在第三方面的第九种实现方式中，所述处理单元，还用于：
分别添加与每路CPRI业务对应的CPRI起始帧帧头开销，所述CPRI起始帧帧头开销至少包括用于指示每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置的帧头指示信息。
结合第三方面、第三方面的第一种、第二种、第三种、第四种、第五种、第六种、第七种、第八种或者第九种实现方式中的任意一种，在第三方面的第十种实现方式中，所述复用单元还用于：
将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道传输单元开销，构成光通道传输单元。
第四方面，本发明还提供了一种数据解析的装置，所述装置包括：
获取单元，用于根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型；
确定单元，用于当所述业务类型为包括m路CPRI业务的CPRI混合业务时，确定与所述m路CPRI业务一一对应的m路光通道数据支路单元；
解映射单元，用于根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧；
所述获取单元，还用于获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
结合第四方面，在第四方面的第一种实现方式中，所述获取单元，具体用于：
获取所述光通道净荷单元的开销区携带的净荷类型指示信息，根据所述净荷类型指示信息，得到所述光通道净荷单元承载的业务类型。
结合第四方面或者第四方面的第一种实现方式，在第四方面的第 二种实现方式中，所述确定单元，具体用于：
获取所述光通道净荷单元的开销区携带的净荷结构指示信息，根据所述净荷结构指示信息得到所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识；
根据所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识，识别与所述m路CPRI业务一一对应的m路光通道数据支路单元。
结合第四方面、第四方面的第一种实现方式或者第二种实现方式中的任意一种，在第四方面的第三种实现方式中，所述解映射单元，具体用于：
根据每路所述光通道数据支路单元中携带的映射开销信息，得到对应的每路CPRI业务的时钟源信息；
当所述CPRI业务为所述参考时钟业务或者与所述参考时钟业务采用相同时钟源的CPRI业务时，通过比特同步映射规程或者同步通用映射规程对对应的光通道数据支路单元进行解映射处理；
当所述CPRI业务为与所述参考时钟业务采用不同时钟源的CPRI业务时，通过异步通用映射规程对对应的光通道数据支路单元进行解映射处理。
结合第四方面、第四方面的第一种实现方式、第二种或者第三种实现方式中的任意一种，在第四方面的第四种实现方式中，所述获取单元，具体用于：
获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧的位置信息；
或者
识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息。
结合第四方面、第四方面的第一种、第二种、第三种或者第四种实现方式中的任意一种，在第四方面的第五种实现方式中，所述装置还包括编码单元，具体用于：
对每路所述CPRI业务对应的所有CPRI基本帧进行编码处理。
第五方面，本发明提供了一种网络设备，包括：处理器、存储器和接收器；存储器用于存储计算机执行指令，当网络设备运行时，处理器执行存储器存储的计算机执行指令，以使网络设备执行如第一方面及第一方面的任意一种可能的实现方式所述的方法。
第六方面，本发明提供了一种网络设备，包括：处理器、存储器和接收器；存储器用于存储计算机执行指令，当网络设备运行时，处理器执行存储器存储的计算机执行指令，以使网络设备执行如第二方面及第二方面的任意一种可能的实现方式所述的方法。
本发明提供的数据承载的方法及装置，当接收到n路CPRI业务后，直接将n路CPRI业务映射复用至OPU中，与现有技术中，需要将CPRI业务首先映射到低阶ODU中再映射复用至高阶OPU中相比，本发明采用一级映射便可实现CPRI业务的承载，能够减少因为两级映射带来的时延，进而能够实现CPRI业务的快速承载。
本发明提供的数据解析的方法及装置，与发送端的数据承载的方法相对应，仅需要一次解映射即可，能够减少解映射所需要的时延，因而能够实现CPRI业务的快速提取。
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简单地介绍，显而易见地，下面描述中的附图仅仅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的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术中提供的OTU帧结构的结构示意图；
图2为现有技术中提供的OPU帧结构的结构示意图；
图3为现有技术中提供的一种CPRI业务承载的方法的流程示意图；
图4为本发明实施例提供的第一种数据承载的方法的流程示意 图；
图5为本发明实施例提供的第二种数据承载的方法的流程示意图；
图6为本发明实施例提供的单路OPULL的帧结构及时隙划分的示意图；
图7为本发明实施例提供的将n路OPULL通过单字节复用，构成1路OPU的示意图；
图8为本发明实施例提供的由n路OPULL构成的OPU承载数据时，其时隙存放顺序的示意图；
图9为本发明实施例提供的第三种数据承载的方法的流程示意图；
图10为本发明实施例提供的一种添加净荷结构指示的方法的流程示意图；
图11为本发明实施例提供的由256个OPU帧组成的复帧的净荷类型和复用结构指示的存储的示意图；
图12为本发明实施例提供的由相邻两个复用结构指示表示同一时隙的占用情况、承载的CPRI业务情况的示意图；
图13为本发明实施例提供的第四种数据承载的方法的流程示意图；
图14为图13提供的数据承载方法的的具体应用的示意图；
图15为本发明实施例提供的第五种数据承载的方法的流程示意图；
图16为本发明实施例提供的第六种数据承载的方法的流程示意图；
图17为本发明实施例提供的一种指针开销的存储示意图；
图18为本发明实施例提供的第七种数据承载的方法的流程示意图；
图19为本发明实施例提供的另一种指针开销的存储示意图；
图20为本发明实施例提供的第八种数据承载的方法的流程示意图；
图21为本发明实施例提供的添加CPRI起始帧帧头指示的示意图；
图22为本发明实施例提供的一种将增加了CPRI起始帧帧头指示的CPRI超帧数据流映射入ODTU的示意图；
图23为本发明实施例提供的第九种数据承载的方法的流程示意图；
图24为本发明实施例提供的第十种数据承载的方法的流程示意图；
图25为本发明实施例提供的一种将混合CPRI业务的复用映射到OPU的具体应用的示意图；
图26为本发明实施例提供的第一种数据解析的方法的流程示意图；
图27为本发明实施例提供的第二种数据解析的方法的流程示意图；
图28为本发明实施例提供的第三种数据解析的方法的流程示意图；
图29为本发明实施例提供的第四种数据解析的方法的流程示意图；
图30为本发明实施例提供的第五种数据解析的方法的流程示意图；
图31为本发明实施例提供的第六种数据解析的方法的流程示意图；
图32为本发明实施例提供的第七种数据解析的方法的流程示意图；
图33为本发明实施例提供的第一种数据承载的装置的结构示意图；
图34为本发明实施例提供的第二种数据承载的装置的结构示意图；
图35为本发明实施例提供的第三种数据承载的装置的结构示意图；
图36为本发明实施例提供的第四种数据承载的装置的结构示意图；
图37为本发明实施例提供的第一种数据解析的装置的结构示意图；
图38为本发明实施例提供的第二种数据解析的装置的结构示意图；
图39为本发明实施例提供的第五种数据承载的装置的结构示意图；
图40为本发明实施例提供的第三种数据解析的装置的结构示意图。
具体实施方式
下面将结合本实施例中的附图，对本实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅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。
本发明实施例提供了一种数据承载的方法，所述方法应用于光传送网中的发送端。其中，本发明实施例中所指的数据主要为包括至少两路CPRI业务的CPRI混合业务。
本发明实施例提供的数据承载的方法，如图4所示，包括：
101：接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数。
102：将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中。
其中，所述映射方式可以为BMP映射(英文：Bit Synchronous Mapping Procedure，简称：BMP)、BGMP映射(英文：Bit-synchronous Generic Mapping Procedure，简称：BGMP)或 AGMP映射(英文：Asynchronous Generic Mapping Procedure，简称：AGMP)，具体采用的映射方式可根据CPRI业务的类型以及时钟源等确定，可参考后文详述。
本步骤中所指的映射为一一映射的过程，也即将1路CPRI业务映射入1路ODTU中。因而ODTU的路数与待承载的CPRI混合业务包括的CPRI业务的路数相同。
在进行映射的同时，需要在ODTU的时隙开销位置JC1～JC6添加映射开销信息，具体为：对于BGMP映射处理，则通过固定的Cm值将CPRI数据流映射入ODTU，并添加Cm信息到JC1～JC3；对于AGMP映射处理，则需要实时统计待映射的CPRI业务流量，生成相应的Cm值以及时钟信息CnD。其中，Cm值用于表示单个ODTU周期内待承载的所述CPRI业务的数量，单位为m比特；CnD值用于表示单个ODTU周期内待承载的所述CPRI业务相对于上一个ODTU周期内待承载的所述CPRI业务的变化量，单位为n比特。时钟信息CnD用于接收端根据该时钟信息CnD恢复原始CPRI业务时钟并进行CPRI业务处理。
103：将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中。
本步骤中，将步骤102中的多路ODTU复用到1路OPU中。
其中，所述时隙的速率等于CPRI基本速率。该基本速率可以CPRI基本帧速率的倍数。
根据CPRI协议定义，CPRI基本帧的速率为3.84MHz。不同类型的CPRI业务的基本帧大小不同，因而不同类型的CPRI业务的速率也不相同。例如，CPRI Option 1的基本帧大小为128bit，则对应的速率为491.52Mbit/s。
作为一种可选的实现方式，本实施例中CPRI基本速率为128倍的CPRI基本帧的速率，也即CPRI option 1的速率也即为491.52Mbit/s(采用8B/10B编码前)或614.4Mbit/s(采用8B/10B 编码后)。
为了便于描述，下文中均以CPRI基本速率为CPRI option 1的速率为例进行说明，并不对本申请带来限定。
下表表1给出了不同类型的CPRI业务(CPRI option 1～8)的速率编码前和编码后分别与CPRI基本速率(CPRI option 1的速率)的对应关系。
表1
Figure PCTCN2016086254-appb-000001
本发明提供的数据承载的方法，当接收到n路CPRI业务后，直接将n路CPRI业务映射复用至OPU中，与现有技术中，需要将CPRI业务首先映射到低阶ODU中再映射复用至高阶OPU中相比，本发明采用一级映射便可实现CPRI业务的承载，能够减少因为两级映射带来的时延，进而能够实现CPRI业务的快速承载。
此外，由于省去了将CPRI业务映射到低阶ODU的过程，因而能够减少低阶ODU所占用的带宽，提高带宽利用率。
发明人在研究中发现，现有技术还存在的一个问题为：现有技术中的OPUk的单个时隙的速率为1.25Gbit/s，现有技术中在将各CPRI业务通过OTN网络传送时，还存在严重的带宽浪费的问题。例如：CPRI option 1业务以及CPRI option 2业务在第一级映射到ODU0时，并没有完全使用ODU0的净荷速率，存在带宽浪费。同理，CPRI option3业务在第一级映射到ODU1时，并没有完全使用ODU1的净荷速率，存在带宽浪费。
为了解决上述问题，本发明在进行数据承载之前，已经预先配置有包含不同时隙数的OPU也即是不同带宽的OPU，可根据待承载的多路CPRI业务的速率来选取所需要的OPU。因而，作为图4所示方法的补充，步骤101“将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中”之前，如图5所示，所述方法还包括：
201：根据每路所述CPRI业务的速率和单个所述时隙的速率，确定所述m路CPRI业务所需要的时隙的第一数量。
在本步骤的具体实现方式中，计算待承载的混合CPRI业务的总速率与所述单个时隙的速率的比值，如果该比值为整数值，则第一数量的取值为该比值；如果该比值为非整数值，则将该比值加1后取整得到的值即为该第一数量。
例如：待承载的CPRI混合业务为包括1路CPRI option1、2路CPRI option2和5路CPRI option4的混合业务，则根据表1示出的不同类型的CPRI业务与基本速率的对应关系，可得到待承载的CPRI混合业务的总速率为1*1+2*2+5*5＝30倍的基本速率。因而确定出待占用的时隙的第一数量为30。
202：选取包含所述第一数量的时隙的所述光通道净荷单元。
在本步骤的一种实现方式中，本步骤中选取的OPU的帧结构为n倍预设速率的光通道净荷单元，所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路(英文：Optical Channel Payload  Unit Logic Lane，简称：OPULL)按照预设字节间插复用形成。其帧结构大小为4行3824n列。其中，单个所述光通道净荷单元逻辑支路包括开销区和净荷区，净荷区包括第二预设数量的所述时隙。
所述n的取值根据所述第一数量与第二数量的比值确定。该过程具体为：求取第一数量与第二预设数量的比值，如果该比值为整数值，则将该整数值作为所需要的OPULL的个数；如果该比值不是整数值，则将该比值加1后取整得到的整数值作为所需要的OPULL的个数。
例如：待承载的m路CPRI业务所需占用的时隙数为120个，单个OPULL所包含的时隙数为24个，则所需要的OPULL的个数为5个，因而选取的OPU为包含5个OPULL的OPU。当待承载的CPRI业务所需占用的时隙数为55个，单个OPULL所包含的时隙数为24个，则所需的OPULL的个数为3个，因而选取的OPU为包含3个OPULL的OPU。
该OPU的帧结构、时隙划分可见后文详述。
在本步骤的另外一种实现方式中，当OPU的帧结构为固定大小，如直接利用现有技术的OPU的4行3824列的固定大小的帧结构，则直接选取包含第一数量的时隙数的OPU即可。这种OPU的预先配置过程为，对OPU的帧结构进行时隙划分，使得不同OPU的帧结构的大小相同，但包含的时隙数不同，这样可根据待承载的CPRI业务选取包含的时隙数与第一数量最接近且能够保证CPRI业务的承载的OPU。
本发明预先配置的上述OPU可带来如下有益效果：
本发明提供的OPU包括一个或多个速率为CPRI基本速率的时隙，时隙粒度较小且时隙数与待承载的CPRI业务相匹配。因而待承载的CPRI业务能够有效的利用本发明实施例提供的OPU的带宽，提高带宽利用率。
作为对图5所示方法中所指的可变帧结构OPU的具体说明，该OPU为n倍预设速率的光通道净荷单元，所述n倍预设速率的OPU包括n个OPULL，所述n的取值根据所述m路CPRI业务的总带宽确定，单个所述OPULL的带宽为所述预设速率，单个OPULL的帧 结构的大小可以采用与现有技术相同的大小，也即为4行3824列，单个所述OPULL包括开销区和净荷区，开销区包括单个所述OPULL的开销，净荷区包括第二预设数量的所述时隙。
所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路按照预设字节间插复用形成，具体的间插复用是指，所述OPU的帧结构包括开销区和净荷区，开销区由每路所述OPULL的开销区按照预设字节依次间插复用形成；净荷区由每路所述OPULL的净荷区按照所述预设字节依次间插复用形成。
根据发明人对实际CPRI业务承载过程的研究可得，单个OPULL的最佳承载容量约为10Gbit/s-12Gbit/s之间。因而，如果选取单个时隙的速率为编码前的491.52Mbit/s，则第二预设数量可以取为24，对应的单个OPULL的预设速率约为12Gbit/s；该第二预设数量的取值还可以为20个，对应的单个OPULL的预设速率约为10Gbit/s。如果选取单个时隙的速率为编码后的614.4Mbit/s，则第二预设数量可以取为20，对应的单个OPULL的预设速率约为12Gbit/s。
当单个OPULL的带宽为10G Gbit/s时，可以将由n路OPULL组成的OPU命名为OPUXn，其中“X”为罗马数字，表示10G；当单个OPULL的带宽为12Gbit/s时，可以将由n路OPULL组成的OPU命名为OPUXIIn，其中“XII”为罗马数字，表示12G。其中无论12G还是10G都只是一个近似值的表述，不代表精确的速率值。
此外，与现有技术类似，将OPU增加ODU开销可形成ODU，再将ODU增加OTU开销区可形成OTU。下表表2示出了当单个时隙的速率分别为491.52Mbit/s和614.4Mbit/s时，OPUXIIn的净荷区速率以及ODUXIIn/OTUXIIn的速率。与OPUXIIn的净荷区速率相比，之所以ODUXIIn/OTUXIIn的速率为OPUXIIn的净荷区速率的239/238倍，是因为ODUXIIn/OTUXIIn相对OPUXIIn净荷区包含了额外的16n列开销区。
表2
Figure PCTCN2016086254-appb-000002
Figure PCTCN2016086254-appb-000003
以划分24个时隙为例，如图6所示为单路OPULL的帧结构及时隙划分，具体为：单路OPULL的帧结构为第1～4行第15列到第3824列共4行*3810列，包括15～16列两列开销区和17列～3824列共3808列净荷区，其中，开销区用于存储时隙开销、PSI和复帧指示；在净荷区以单字节为粒度划分为24个时隙。图6示出的为以24帧上述OPULL构成的24-复帧，每个帧的结构相同。
需要说明的是，上述时隙粒度之所以选取为单字节是由于单个时隙的带宽并不太大；如果单个时隙的带宽较大，例如：2.5Gbit/s，则净荷区的时隙划分粒度还可以为多字节。
在图6所示的单路OPULL的帧结构以及时隙划分的基础上，可将n路OPULL通过单字节或多字节复用，构成1路整体信号，也即1路OPU信号。如图7所示为将n路OPULL通过单字节复用形成的OPU的帧结构，具体为第1～4行的(14n+1)～16n列为OPU的开销区，由n路OPULL的开销区按照单字节复用而成，第1～4行的(16n+1)～3824n列为OPU的净荷区，由n路OPULL的净荷区按照单字节复用而成。相应的OPU净荷区(16n+1～3824n列)划分为24n个时隙。时隙编号为TS A.B(其中A为单路OPULL信号编号，取值可以为1…n；B为单路OPULL中每个时隙的编号，取值为1…24；也即OPU中的时隙编号为，1.1,2.1,…,n.1,1.2,2.2,…,直到n.24)。
需要说明的是，图6和图7在描述的时候均以单路OPULL的帧结构从第15列开始或OPU的帧结构从第15n列描述，是由于通过在前14列(单路OPULL)或前14n列(由n路OPULL构成的OPU)添加ODU开销、OTU开销，进一步可构成ODU帧的帧结构和OTU帧的帧结构。也即，以由n路OPULL构成的OPU为例，第1行的 1～7n列为帧头指示开销，第1行的(7n+1)～14n列为OTU的开销区，第2～4行的1～14n列为ODU的开销区。
还需要说明的是，与传统的OTU的帧结构类似，本发明实施例提供的包括n路OPULL组成的OPU的帧结构，之后进一步构成的OTU帧结构也可以分为包括校验区和不包括校验区两类。
此外，如果将单个时隙的带宽设为编码后的614.4Mbit/s，则可采用相同大小的单路OPULL的帧结构，单路OPULL的带宽仍取值为12Gbit/s左右，区别点仅在于单个时隙的带宽以及将单路OPULL的净荷区划分为20个时隙而不是24个时隙，相应的可以将20个OPULL帧形成20-复帧。其具体实现过程与单个时隙的带宽为编码前的491.52Mbit/s以及划分24个时隙的过程类似，本实施例不再赘述。
结合上述时隙划分过程，如图8所示给出了当由n路OPULL构成的OPU承载多路混合业务时，其时隙存放顺序。实际应用时，需要按照该时隙顺序进行CPRI业务的承载。
例如：某路待承载的CPRI业务需要占用TS1.1、TS1.2、TS2.1三个时隙，则其承载顺序为TS1.1、TS2.1、TS1.2。
作为图4所示方法的补充，每路ODTU净荷区中包含的时隙数与对应的CPRI业务所需要的时隙数，因而在步骤102的具体实现方式中，需要计算每路CPRI业务的速率与所述单个时隙的速率的比值，如果该比值为整数值，则将该比值取值作为该路CPRI业务对应的时隙数；如果该比值为非整数值，则将该比值加1后取整得到的值作为该路CPRI业务对应的时隙数。
例如：待承载的CPRI业务为包括1路CPRI option1、2路CPRI option2和5路CPRI option4的混合业务，则根据表1示出的不同类型的CPRI业务与基本速率的对应关系，可得到待承载的CPRI option1的带宽为1倍的基本速率，则其对应的第一数量为1；每路CPRI option2的带宽为2倍的基本速率，则两路CPRI option2对应 的第一数量分别为2、2；每路CPRI option4的带宽为5倍的基本速率，则5路CPRI option4对应的第一数量分别为5、5、5、5、5。
作为对图4所示方法的细化，步骤102“将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中”，可根据待承载的CPRI业务所采用的时钟源采取对应的映射方法，如图9所示，该过程具体包括：
301：将第一路所述CPRI业务确定为参考时钟业务，所述第一路CPRI业务为所述至少两路CPRI业务中的任意一路。
例如：可以选择最低速率CPRI业务作为参考时钟业务。
302：将所述参考时钟业务以及与所述参考时钟业务采用相同时钟源的CPRI业务通过比特同步映射规程或者同步通用映射规程一一对应的映射入所述光通道数据支路单元中。
303：将与所述参考时钟业务采用不同时钟源的CPRI业务通过异步通用映射规程一一对应的映射入所述光通道数据支路单元中。
作为图4所示方法的细化，步骤103中“将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中”的同时，还需要增加净荷结构指示(英文：payload structure identifier，简称：PSI)的具体信息，其包括净荷类型指示(英文：payload type，简称：PT)和复用结构指示(英文：Multiplex structure identifier简称：MSI)。其中，PT用于指示当前OPU净荷区承载的业务为CPRI混合业务；MSI用于指示OPU的各个时隙的承载情况，例如各个时隙的占用情况，如果某个时隙被占用，则该时隙承载的CPRI业务或CPRI业务组的类型，以及CPRI业务或CPRI业务组的标识号等。相应的所述添加净荷结构指示，如图10所示，具体包括：
401：在复帧指示的值为0的光通道净荷单元的帧结构的开销区增加净荷类型指示，所述净荷类型指示用于表示所述光通道净荷单元当前承载的业务类型为多路CPRI业务。
通过净荷类型PT＝0x23指示OPU当前混合承载多路CPRI业务情况。
当1个OPU的帧结构中包括n个OPULL，且将256个所述OPU 的帧结构组成1个256-复帧时，如图11示出了1个上述OPU的完整帧结构(虚线上方所示)，以及由256个所述OPU的帧结构组成的256-复帧的每个帧对应的部分开销区(虚线下方所示)；其中，所指的部分开销区是指仅仅示出了每个帧的位于第4行第14n+1列～15n共1行n列的开销区，也即每个帧的PSI部分的具体存储的信息。其中0～255为每个OPU帧的编号，也即复帧指示。
其中，本步骤中所指的净荷类型PT位于在复帧指示的值为0的OPU的开销区，也即复帧指示的值为0的OPU的帧结构对应的第1个OPULL的PSI为PT；RES表示保留位。
402：在复帧指示的值为2至复帧指示的最大值的光通道净荷单元的帧结构的开销区增加复用结构指示，相邻的两帧的复用结构指示用于表示当前时隙是否被占用、当前时隙承载的CPRI业务类型、CPRI业务或CPRI业务组的标识。
如图11所示，从复帧指示的值为2至复帧指示的值为255，共254个OPU帧的PSI中存储了复用结构指示开销MSI，每帧携带n个复用结构指示开销，用于表示各个时隙的占用情况等。
例如：第2到2x+1帧分别携带MSI[A.2],MSI[A.3],…,MSI[A.2x+1]，用于指示TSA.1,TSA.2,…,TSA.x占用情况，其中A＝1～n，为相应的OPULL在OPU中的编号；1,2,…,x为当前OPULL中的时隙编号。
结合图11，图12示出了相邻两帧的相邻两个MSI用于表示同一时隙的占用情况、承载的CPRI业务情况等具体含义。具体为：通过每2个字节指示一个时隙的占用情况。其中，前一帧的第1bit表示该时隙是否被占用，0表示占用，1表示空闲；第2bit-5bit共4bit表示承载的CPRI业务类型，例如0000表示CPRI Option1，0001表示CPRI Option 2，…，0111表示CPRI Option 8，1000～1111则保留为未来更高速率的CPRI业务类型使用，例如CPRI Option 9等；前一帧的第6～8bit以及后一帧的8bit共11比特表示CPRI业务ID或者CPRI业务组ID。对于CPRI业务组情况，通过相应的该CPRI业务组占用的时隙数量和CPRI业务类型可知该CPRI业务组所包含 的CPRI业务数量。
为了提高承载效率，降低管理复杂度，作为对图4所示方法的补充，步骤102“将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中”之前，如图13所示，所述方法还包括对待承载的CPRI业务进行分组的过程，这样复用后仅需要对1组复用后的CPRI业务进行集中监控和管理，该过程具体为：
501：将采用相同时钟源且业务类型相同的至少一路CPRI业务确定为一组业务。
502：如果确定出的一组业务中包括至少两路CPRI业务，则将所述至少两路CPRI业务比特或字节复用为一路串行比特流。
当然，对于仅含1路CPRI业务的组，则无需比特或字节复用。
当对CPRI业务分组完成后，可按照步骤102至步骤103进行CPRI业务的承载。
其中，一路串行比特流可以看做一路CPRI业务。
如图14为将多路CPRI业务按照上述步骤501和步骤502的过程分组后的具体承载过程示意图。其中，将m1路与参考时钟源采用相同时钟源且业务类型相同的CPRI业务复用为1路CPRI业务，然后再采用BMP或BGMP的映射方式映射到一路由ts1个时隙组成的ODTU中(图中以ODTU.ts1示出)；同理，将m2路采用相同时钟源且业务类型相同的CPRI业务复用为1路CPRI业务再采用AGMP的映射方式映射到一路由ts2个时隙组成的ODTU中(图中以ODTU.ts2示出)；将mi路采用相同时钟源且业务类型相同的CPRI业务复用为1路CPRI业务再采用AGMP的映射方式映射到一路由tsi个时隙组成的ODTU中(图中以ODTU.tsi示出)中；再将多路ODTU复用到1路OPU中。
作为对图4所示方法的细化，由于编码前单个时隙的速率相对于编码后较小，因而可将所述光通道净荷单元中单个时隙的带宽为CPRI Option 1编码前的带宽，也即491.52Mbit/s；而待承载的CPRI业务一般为编码后的业务，因而需要对待承载的CPRI业务首先进行解码处理。因而，步骤102“将接收到的m路CPRI业务以一对一的 方式映射到m路光通道数据支路单元中”之前，如图15所示，所述方法还包括：
601：对待承载的所述m路CPRI业务进行解码，得到解码后的所述m路CPRI业务。
该解码过程为与表1所示的编码方式的逆过程。解码后可得到不同类型的CPRI业务，下表表3给出了不同类型的CPRI业务对应的CPRI基本帧所包含的码字大小以及基本帧大小：
表3
Figure PCTCN2016086254-appb-000004
根据表3中示出的各种类型的CPRI业务的基本帧大小与基本帧速率可以得到每种类型的CPRI业务的速率，其与表1所示是一致的
此外，由于对待承载的CPRI业务进行了解码，因而需要增加指针开销信息以指示CPRI业务的起始帧在ODTU中的位置。因而，作为图4所示方法的细化，步骤102中“将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中”的同时，如图16所示，所述方法还包括：
701：分别生成与每路所述CPRI业务对应的指针开销信息，所 述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置。
702：分别将所述指针开销信息存储至对应的光通道数据支路单元的开销区。
在本步骤的具体实现中，连续的256个CPRI基本帧组成一个CPRI超帧，CPRI超帧的第一帧CPRI基本帧也即起始帧，记录该起始帧在ODTU的位置并生成指针开销信息(英文：Basic Frame Pointer，简称：BFP)。
其中，指针开销信息可放置于ODTU的开销区，如图17所示，为ODTU每个时隙划分2个字节为每个时隙的开销区，如果ODTU包括ts个时隙，则对应的开销区总共包括2*ts个字节，可用于放置指针开销信息；剩余的部分则为映射该CPRI业务的净荷区。此外，图中还示出了用于放置映射开销的JC1至JC6，图中以ODTU.ts表示ODTU由ts个时隙组成。
作为步骤702的替换，还可以分别将所述指针开销信息存储至所述光通道净荷单元的复用结构指示中。如图18所示，该过程包括：
801：分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置。
802：分别将所述指针开销信息存储至所述光通道净荷单元的复用结构指示中。
如图19所示，基于由256帧OPU组成的256复帧，将指针开销信息放置于MSI。这种情况下，与图12中每个时隙对应两个字节相比，此时每个时隙对应4个字节，前两个字节同样用于指示该TS被占用的情况；后两个字节用于放置指针开销信息。这样可直接将CPRI业务映射入ODTU的整个净荷区。
此外，所述用于放置指针开销的部分(ODTU的开销区或OPU的MSI)，还用于添加延时测量开销，所述延时测量开销用于记录CPRI帧的设备内部处理及线路传输延时。
除了上述在ODTU的开销区或者OPU的开销区增加指针开销信 息的方式来指示CPRI起始帧的位置，还可以通过为CPRI业务的起始帧增加帧头指示开销来指示CPRI起始帧的位置。则在步骤102“将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元”之前，如图20所示，所述方法还包括：
901：分别添加与每路CPRI业务对应的CPRI起始帧帧头开销，所述CPRI起始帧帧头开销至少包括用于指示每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置的帧头指示信息。
本步骤执行在步骤601之后，当然也可以不执行步骤601。
还未进入光传送网进行承载的CPRI业务由CPRI基本帧进行承载，256个CPRI基本帧构成一个CPRI超帧，CPRI超帧中的第一个CPRI基本帧又可称之为CPRI起始帧，每路CPRI业务对应一个或多个连续CPRI超帧。
其中，该帧头开销具体可以包含CPRI起始帧帧头指示、校验信息以及传输时延测量开销等。如图21所示，每个256-CPRI超帧前包含了8字节开销信息，包含4字节CPRI超帧帧头指示(例如0xf6f62828)、1字节的BIP8校验，2字节的延迟测量开销LC1和LC2，1字节为保留字节。
如图22所示，将添加了帧头开销的CPRI超帧数据流直接映射入ODTU。
对应于图16、图18和图20所示的三种方式，OTUXIIn的速率可以进一步精确表示如表4所示。其中方式一，由于ODTU原始的净荷区中增加了2n字节的开销区，用于放置指针开销信息，每个时隙对应2个字节开销区，所以通过(15232/15230)2*491.52Mbit/s计算得到的值作为时隙的带宽；方式二，由于将指针开销信息放置于OPU开销区，并未占用ODTU原始的净荷区，所以通过(15232/15230)*491.52Mbit/s计算得到的值作为时隙的基本带宽；方式三，由于直接在每个CPRI超帧的基础上增加了8字节帧头开销信息，所以选择492.5Mbit/s作为时隙的基本带宽，相对491.52Mbit/s提高一点速率，保证ODTU可以承载加了CPRI超帧帧头指示信息的CPRI业务。
表4
Figure PCTCN2016086254-appb-000005
需要说明的是，如果OPU中单个时隙的带宽设定为CPRI Option1编码前的带宽(614.4Mbit/s)，则无需对CPRI业务进行解码处理，相应的也无需增加用于指示CPRI业务对应的CPRI起始帧的位置信息的指针开销或帧头开销。
在实际的数据承载过程中，只有将数据最终封装为OTU帧结构才能由发送端送出至接收端。因而，作为图4所示方法的补充，在步骤103“将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中”之后，如图23所示，所述方法还包括：
1001：将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道传输单元开销，构成光通道传输单元。
由于待承载的CPRI业务为由BBU/RRU发送至RRU/BBU之间的，为点对点的一种传输，因而无须增加ODU开销信息，可以直接增加OTU开销形成OTU。
当然，也可以增加ODU开销形成ODU后，再增加OTU开销形成OTU，因而作为步骤1001的替换，如图24所示，所述方法还包括：
1101：将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道数据单元开销，构成光通道数据单元。
1102：将光通道数据单元添加光通道传输单元开销，构成光通道传输单元。
作为上述方法的具体应用，如图25所示，以单个时隙的带宽为 编码后的614.4Mbit/s为例，本发明实施例提供了一种具体的映射过程。假如待承载CPRI业务包括CPRI3、CPRI7、CPRI8各1路。则基于CPRI编码后基本速率构建OPU进行数据承载，则约为40倍基本速率，因而包含40个时隙。
其中，CPRI3占用其中4个时隙，例如：TS1.1,TS2.1,TS1.8,TS2.8；CPRI7占用其中16个时隙，例如TS1.3,TS1.4,TS1.5,TS1.6,TS1.7,TS1.9,TS1.10,TS1.11,TS1.12,TS1.13,TS1.14,TS1.15,TS1.16,TS1.17,TS1.18,TS1.19,；CPRI8占用其中20个时隙，例如TS2.1,TS1.2,TS2.2,TS2.3,TS2.4,TS2.5,TS2.6,TS2.7,TS2.8,TS2.9,TS2.10,TS2.11,TS2.12,TS2.13,TS2.14,TS2.15,TS2.16,TS2.17,TS2.18,TS2.19,TS1.20,TS2.20。
与发送端的数据承载过程相对应，本发明实施例还提供了一种数据解析的方法，所述方法应用于光传送网中的接收端，如图26所示，所述方法包括：
1201：根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型。
1202：当所述业务类型为包括m路CPRI业务的CPRI混合业务时，确定与所述m路CPRI业务一一对应的m路光通道数据支路单元。
1203：根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧。
1204：获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
本发明实施例提供的数据解析的方法，与发送端的数据承载的方法相对应，仅需要一次解映射即可，能够减少解映射所需要的时延，因而能够实现CPRI业务的高效快速提取。
其中，作为图26所示方法的细化，步骤1201“根据所述光通道 净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型”，如图27所示，具体包括：
1301：获取所述光通道净荷单元的开销区携带的净荷类型指示信息，根据所述净荷类型指示信息，得到所述光通道净荷单元承载的业务类型。
其中，作为图26所示方法的细化，步骤1202“确定与所述m路CPRI业务一一对应的n路光通道数据支路单元”，如图28所示，具体包括：
1401：获取所述光通道净荷单元的开销区携带的净荷结构指示信息，根据所述净荷结构指示信息得到所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识。
1402：根据所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识，识别与所述m路CPRI业务一一对应的m路光通道数据支路单元。
其中，作为图26所示方法的细化，步骤1203“根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧”，如图29所示，具体包括：
1501：根据每路所述光通道数据支路单元中携带的映射开销信息，得到对应的每路CPRI业务的时钟源信息。
1502：如果所述CPRI业务为所述参考时钟业务或者与所述参考时钟业务采用相同时钟源的CPRI业务，则通过比特同步映射规程或者同步通用映射规程对对应的光通道数据支路单元进行解映射处理。
1503：如果所述CPRI业务为与所述参考时钟业务采用不同时钟源的CPRI业务，则通过异步通用映射规程对对应的光通道数据支路单元进行解映射处理。
作为图26所示方法的细化，步骤1204中“获取每路所述CPRI业务对应的CPRI起始帧的位置信息”，具体为获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧 的位置信息。进而，步骤1204“获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧”，如图30所示，具体包括：
1601：获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧的位置信息，进而得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
或者步骤1204中“获取每路所述CPRI业务对应的CPRI起始帧的位置信息”，具体为识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息。进而，步骤1204“获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧”，如图31所示，具体包括：
1701：识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息，进而得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
作为图26所示方法的补充，步骤1204“获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧”之后，如图32所示，所述方法还包括：
1801：对每路所述CPRI业务对应的所有CPRI基本帧进行编码处理。
在本步骤的具体实现过程中，如果发送端对原始CPRI业务进行了解码处理，则与发送端相对，接收端需要对CPRI业务进行编码处理，例如：CPRI option1-7业务进行8B/10B的编码方式，CPRI option8业务进行64B/66B编码处理。
此外，需要补充的是，如果发送端对CPRI业务进行了分组并按照分组进行映射，则需要对解映射出的每组多路CPRI串行比特流进行比特或字节解复用处理，获得多路CPRI业务。
作为上述数据承载的各个方法的具体实现，本发明实施例还提供 了一种数据承载的装置，所述装置应用于光传送网中的发送端，如图33所示，所述装置包括：
接收单元101，用于接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数。
映射单元102，用于将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中。
复用单元103，用于将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中；
其中，所述时隙的速率等于CPRI基本速率。
进一步的，如图34所示，所述装置还包括处理单元201，用于根据每路所述CPRI业务的速率和单个所述时隙的速率，确定所述m路CPRI业务所需要的时隙的第一数量；
选取包含所述第一数量的时隙的所述光通道净荷单元。
进一步的，所述处理单元201选取的所述光通道净荷单元为n倍预设速率的光通道净荷单元，所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路按照预设字节间插复用形成；
单个所述光通道净荷单元逻辑支路包括开销区和净荷区，净荷区包括第二预设数量的所述时隙；
所述n的取值根据所述第一数量与第二数量的比值确定。
进一步的，所述映射单元102，具体用于：将第一路所述CPRI业务确定为参考时钟业务，所述第一路CPRI业务为所述至少两路CPRI业务中的任意一路；
将所述参考时钟业务以及与所述参考时钟业务采用相同时钟源的CPRI业务通过比特同步映射规程或者同步通用映射规程一一对应的映射入所述光通道数据支路单元中；
将与所述参考时钟业务采用不同时钟源的CPRI业务通过异步通用映射规程一一对应的映射入所述光通道数据支路单元中。
进一步的，所述复用单元103，还用于：
在复帧指示的值为0的光通道净荷单元的帧结构的开销区增加 净荷类型指示，所述净荷类型指示用于表示所述光通道净荷单元当前承载的业务类型为多路CPRI业务；
在复帧指示的值为2至复帧指示的最大值的光通道净荷单元的帧结构的开销区增加复用结构指示，相邻的两帧的复用结构指示用于表示当前时隙是否被占用、当前时隙承载的CPRI业务类型、CPRI业务或CPRI业务组的标识。
进一步的，如图35所示，所述装置还包括分组单元301，具体用于：
将采用相同时钟源且业务类型相同的至少一路CPRI业务确定为一组业务；
当确定出的一组业务中包括至少两路CPRI业务时，将所述至少两路CPRI业务比特或字节复用为一路串行比特流。
进一步的，所述光通道净荷单元中单个时隙的带宽为CPRI选项1编码前的带宽；如图36所示，所述装置还包括解码单元401，用于对待承载的所述m路CPRI业务进行解码，得到解码后的所述m路CPRI业务。
进一步的，所述映射单元102，还用于：
分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至对应的光通道数据支路单元的开销区；
进一步的，所述映射单元102，还用于分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至所述光通道净荷单元的复用结构指示中。
进一步的，所述处理单元201，还用于分别添加与每路CPRI业务对应的CPRI起始帧帧头开销，所述CPRI起始帧帧头开销至少包括用于指示每路所述CPRI业务的起始帧在对应的所述光通道数据支 路单元的位置的帧头指示信息。
进一步的，所述复用单元103，还用于将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道传输单元开销，构成光通道传输单元；
或者
将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道数据单元开销，构成光通道数据单元；将光通道数据单元添加光通道传输单元开销，构成光通道传输单元。
本发明提供的数据承载的装置，当接收到n路CPRI业务后，直接将n路CPRI业务映射复用至OPU中，与现有技术中，需要将CPRI业务首先映射到低阶ODU中再映射复用至高阶OPU中相比，本发明采用一级映射便可实现CPRI业务的承载，能够减少因为两级映射带来的时延，进而能够实现CPRI业务的快速承载。
作为上述数据解析方法的具体应用，本发明实施例还提供了数据解析的装置，所述装置应用于光传送网中的接收端，所述光传送网中包括光通道净荷单元，所述光通道净荷单元包括至少一个时隙，单个所述时隙的带宽为通用公共无线接口CPRI基本速率，如图37所示，所述装置包括：
获取单元601，用于根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型。
确定单元602，用于当所述业务类型为包括m路CPRI业务的CPRI混合业务时，确定与所述m路CPRI业务一一对应的m路光通道数据支路单元。
解映射单元603，用于根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧。
所述获取单元601，还用于获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
进一步的，所述获取单元601，具体用于：
获取所述光通道净荷单元的开销区携带的净荷类型指示信息，根据所述净荷类型指示信息，得到所述光通道净荷单元承载的业务类型。
进一步的，所述确定单元602，具体用于：
获取所述光通道净荷单元的开销区携带的净荷结构指示信息，根据所述净荷结构指示信息得到所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识；
根据所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识，识别与所述m路CPRI业务一一对应的m路光通道数据支路单元。
进一步的，所述解映射单元603，具体用于：
根据每路所述光通道数据支路单元中携带的映射开销信息，得到对应的每路CPRI业务的时钟源信息；
当所述CPRI业务为所述参考时钟业务或者与所述参考时钟业务采用相同时钟源的CPRI业务时，通过比特同步映射规程或者同步通用映射规程对对应的光通道数据支路单元进行解映射处理；
当所述CPRI业务为与所述参考时钟业务采用不同时钟源的CPRI业务时，通过异步通用映射规程对对应的光通道数据支路单元进行解映射处理。
进一步的，所述获取单元601，具体还用于：
获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧的位置信息；
或者
识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息。
进一步的，如图38所示，所述装置还包括：编码单元701，用于对每路所述CPRI业务对应的所有CPRI基本帧进行编码处理。
本发明提供的数据解析的装置，与发送端的数据承载的方法相对应，仅需要一次解映射即可，能够减少解映射所需要的时延，因而能 够实现CPRI业务的高效快速提取。
作为上述数据承载的方法的具体实现，本发明实施例还提供了一种数据承载的装置，所述装置应用于光传送网中的发送端，所述装置，如图39所示，包括接收器801、存储器802、处理器803、发射器804和总线805，接收器801、存储器802、处理器803和发射器804通过总线805连接，其中：
接收器801，用于接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数。
存储器802，用于将将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中。
存储器802，还用于将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中；其中，所述时隙的速率等于CPRI基本速率。
进一步的，所述处理器803，用于根据每路所述CPRI业务的速率和单个所述时隙的速率，确定所述m路CPRI业务所需要的时隙的第一数量；
选取包含所述第一数量的时隙的所述光通道净荷单元。
进一步的，所述处理器803选取的所述光通道净荷单元为n倍预设速率的光通道净荷单元，所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路按照预设字节间插复用形成；单个所述光通道净荷单元逻辑支路包括开销区和净荷区，净荷区包括第二预设数量的所述时隙；所述n的取值根据所述第一数量与第二数量的比值确定。
进一步的，所述处理器803，还用于将第一路所述CPRI业务确定为参考时钟业务，所述第一路CPRI业务为所述至少两路CPRI业务中的任意一路。
所述存储器802，还用于将所述参考时钟业务以及与所述参考时钟业务采用相同时钟源的CPRI业务通过比特同步映射规程或者同步 通用映射规程一一对应的映射入所述光通道数据支路单元中；
将与所述参考时钟业务采用不同时钟源的CPRI业务通过异步通用映射规程一一对应的映射入所述光通道数据支路单元中。
进一步的，所述存储器802，还具体用于在复帧指示的值为0的光通道净荷单元的帧结构的开销区增加净荷类型指示，所述净荷类型指示用于表示所述光通道净荷单元当前承载的业务类型为多路CPRI业务；
在复帧指示的值为2至复帧指示的最大值的光通道净荷单元的帧结构的开销区增加复用结构指示，相邻的两帧的复用结构指示用于表示当前时隙是否被占用、当前时隙承载的CPRI业务类型、CPRI业务或CPRI业务组的标识。
进一步的，所述处理器803还用于：将采用相同时钟源且业务类型相同的至少一路CPRI业务确定为一组业务；
当确定出的一组业务中包括至少两路CPRI业务时，将所述至少两路CPRI业务比特或字节复用为一路串行比特流。
进一步的，所述光通道净荷单元中单个时隙的带宽为CPRI选项1编码前的带宽；所述处理器801，还用于对待承载的所述m路CPRI业务进行解码，得到解码后的所述m路CPRI业务。
进一步的，所述存储器802，还用于分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至对应的光通道数据支路单元的开销区。
进一步的，所述存储器802，还用于分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
分别将所述指针开销信息存储至所述光通道净荷单元的复用结构指示中。
进一步的，所述处理器803，还用于分别添加与每路CPRI业务对应的CPRI起始帧帧头开销，所述CPRI起始帧帧头开销至少包括 用于指示每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置的帧头指示信息。
进一步的，所述存储器802，还用于在所述光通道数据支路单元的开销区或所述光通道净荷单元的复用结构指示中添加延时测量开销。
进一步的，所述存储器802，还用于将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道传输单元开销，构成光通道传输单元；
或者
将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道数据单元开销，构成光通道数据单元；将光通道数据单元添加光通道传输单元开销，构成光通道传输单元。
所述发射器804用于将承载了CPRI业务的光通道传输单元通过光纤向发送端发送。
所述存储器802中还存储了处理器803执行过程中所需要的代码。
本发明提供的数据承载的装置，当接收到n路CPRI业务后，直接将n路CPRI业务映射复用至OPU中，与现有技术中，需要将CPRI业务首先映射到低阶ODU中再映射复用至高阶OPU中相比，本发明采用一级映射便可实现CPRI业务的承载，能够减少因为两级映射带来的时延，进而能够实现CPRI业务的快速承载。
作为上述数据解析的方法的具体应用，本发明实施例还提供了一种数据解析的装置，所述方法应用于光传送网中的接收端，所述装置，如图40所示，包括接收器901、处理器902、存储器903和总线904，接收器901、处理器902、存储器903通过总线904连接，其中：
所述接收器901，用于接收发送端发送的承载了CPRI业务的光通道传输单元。
所述处理器902，用于解析所述光通道传输单元可以得到光通道净荷单元。
所述处理器902，还用于根据所述光通道净荷单元的开销区携带 的信息，获取所述光通道净荷单元承载的业务类型；
当所述业务类型为包括m路CPRI业务的CPRI混合业务时，确定与所述m路CPRI业务一一对应的m路光通道数据支路单元；
根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧；
获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
进一步的，所述处理器901，还用于获取所述光通道净荷单元的开销区携带的净荷类型指示信息，根据所述净荷类型指示信息，得到所述光通道净荷单元承载的业务类型。
进一步的，所述处理器901，还用于获取所述光通道净荷单元的开销区携带的净荷结构指示信息，根据所述净荷结构指示信息得到所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识；
根据所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识，识别与所述m路CPRI业务具有相同路数的光通道数据支路单元。
进一步的，所述处理器901，还用于根据每路所述光通道数据支路单元中携带的映射开销信息，得到对应的每路CPRI业务的时钟源信息；
如果所述CPRI业务为所述参考时钟业务或者与所述参考时钟业务采用相同时钟源的CPRI业务，则通过比特同步映射规程或者同步通用映射规程对对应的光通道数据支路单元进行解映射处理；
如果所述CPRI业务为与所述参考时钟业务采用不同时钟源的CPRI业务，则通过异步通用映射规程对对应的光通道数据支路单元进行解映射处理。
进一步的，所述处理器901，还用于获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧的位置 信息。
或者
识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息。
进一步的，所述处理器901，还用于对每路所述CPRI业务对应的所有CPRI基本帧进行编码处理。
所述存储器903还用于存储处理器902执行过程中所需要的代码。
本发明提供的数据解析的装置，与发送端的数据承载的方法相对应，仅需要一次解映射即可，能够减少解映射所需要的时延，因而能够实现CPRI业务的高效快速提取。
需要说明的是，本发明实施例所述的处理器803和902可以是一个处理器，也可以是多个处理元件的统称。例如，该处理器801和901可以是中央处理器(Central Processing Unit，简称CPU)，也可以是特定集成电路(Application Specific Integrated Circuit，简称ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路，例如：一个或多个微处理器(digital signal processor，简称DSP)，或，一个或者多个现场可编程门阵列(Field Programmable Gate Array，简称FPGA)。
存储器802和903可以是一个存储装置，也可以是多个存储元件的统称，且用于存储可执行程序代码等。且存储器802和903可以包括随机存储器(RAM)，也可以包括非易失性存储器(non-volatile memory)，例如磁盘存储器，闪存(Flash)等。
总线805和总线904可以是工业标准体系结构(Industry Standard Architecture，ISA)总线、外部设备互连(Peripheral Component，PCI)总线或扩展工业标准体系结构(Extended Industry Standard Architecture，EISA)总线等。该总线805和904可以分为地址总线、数据总线、控制总线等。为便于表示，图39和图40中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了 解到本发明可借助软件加必需的通用硬件的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在可读取的存储介质中，如计算机的软盘，硬盘或光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述的方法。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。

Claims (37)

  1. 一种数据承载的方法，其特征在于，所述方法包括：
    接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数；
    将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中；
    将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中；
    其中，所述时隙的速率等于CPRI基本速率。
  2. 根据权利要求1所述的方法，其特征在于，
    所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中之前，所述方法还包括：
    根据每路所述CPRI业务的速率和单个所述时隙的速率，确定所述m路CPRI业务所需要的时隙的第一数量；
    选取包含所述第一数量的时隙的所述光通道净荷单元。
  3. 根据权利要求2所述的方法，其特征在于，选取的所述光通道净荷单元为n倍预设速率的光通道净荷单元，所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路按照预设字节间插复用形成；
    单个所述光通道净荷单元逻辑支路包括开销区和净荷区，净荷区包括预设的第二数量的所述时隙；
    所述n的取值根据所述第一数量与第二数量的比值确定。
  4. 根据权利要求3所述的方法，其特征在于，
    所述预设速率为10Gbit/s或12Gbit/s。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中，具体包括：
    将第一路所述CPRI业务确定为参考时钟业务，所述第一路CPRI业务为所述m路CPRI业务中的任意一路；
    将所述参考时钟业务以及与所述参考时钟业务采用相同时钟源的CPRI业务通过比特同步映射规程或者同步通用映射规程一一对应的映射入所述光通道数据支路单元中；
    将与所述参考时钟业务采用不同时钟源的CPRI业务通过异步通用映射规程一一对应的映射入所述光通道数据支路单元中。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中的同时，所述方法还包括：
    在复帧指示的值为0的光通道净荷单元的帧结构的开销区增加净荷类型指示，所述净荷类型指示用于表示所述光通道净荷单元当前承载的业务类型为多路CPRI业务；
    在复帧指示的值为2至复帧指示的最大值的光通道净荷单元的帧结构的开销区增加复用结构指示，相邻的两帧的复用结构指示用于表示当前时隙是否被占用、当前时隙承载的CPRI业务类型、CPRI业务或CPRI业务组的标识。
  7. 根据权利要求1-6任一项所述的方法，其特征在于，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中之前，所述方法还包括：
    将采用相同时钟源且业务类型相同的至少一路CPRI业务确定为一组业务；
    如果确定出的一组业务中包括至少两路CPRI业务，则将所述至少两路CPRI业务比特或字节复用为一路串行比特流。
  8. 根据权利要求1-7任一项所述的方法，其特征在于，所述光通道净荷单元中单个时隙的带宽为CPRI选项1编码前的带宽；
    所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中之前，所述方法还包括：
    对待承载的所述m路CPRI业务进行解码，得到解码后的所述m路CPRI业务。
  9. 根据权利要求1-8任一项所述的方法，其特征在于，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中的同时，所述方法还包括：
    分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
    分别将所述指针开销信息存储至对应的光通道数据支路单元的开销区。
  10. 根据权利要求1-8任一项所述的方法，其特征在于，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中的同时，所述方法还包括：
    分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
    分别将所述指针开销信息存储至所述光通道净荷单元的复用结构指示中。
  11. 根据权利要求1-8任一项所述的方法，其特征在于，所述将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元之前，所述方法还包括：
    分别添加与每路CPRI业务对应的CPRI起始帧帧头开销，所述CPRI起始帧帧头开销至少包括用于指示每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置的帧头指示信息。
  12. 根据权利要求1-11任一项所述的方法，其特征在于，所述将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中之后，所述方法还包括：
    将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道传输单元开销，构成光通道传输单元。
  13. 根据权利要求1-12任一项所述的方法，其特征在于，
    所述CPRI基本速率为CPRI基本帧速率的倍数。
  14. 根据权利要求1-13任一项所述的方法，其特征在于，
    所述CPRI基本速率为491.52Mbit/s或614.4Mbit/s。
  15. 数据解析的方法，其特征在于，所述方法包括：
    根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型；
    当所述业务类型为包括m路CPRI业务的CPRI混合业务时，确定与所述m路CPRI业务一一对应的m路光通道数据支路单元；
    根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧；
    获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
  16. 根据权利要求15所述的数据解析的方法，其特征在于，
    所述根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型，具体包括：
    获取所述光通道净荷单元的开销区携带的净荷类型指示信息，根据所述净荷类型指示信息，得到所述光通道净荷单元承载的业务类型。
  17. 根据权利要求15或16所述的数据解析的方法，其特征在于，所述确定与所述m路CPRI业务一一对应的m路光通道数据支路单元，具体包括：
    获取所述光通道净荷单元的开销区携带的净荷结构指示信息，根据所述净荷结构指示信息得到所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识；
    根据所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识，识别与所述m路CPRI业务一一对应的m路光通道数据支路单元。
  18. 根据权利要求15至17任一项所述的数据解析的方法，其特征在于，所述根据每路所述光通道数据支路单元中携带的映射开销 信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧，具体包括：
    根据每路所述光通道数据支路单元中携带的映射开销信息，得到对应的每路CPRI业务的时钟源信息；
    如果所述CPRI业务为所述参考时钟业务或者与所述参考时钟业务采用相同时钟源的CPRI业务，则通过比特同步映射规程或者同步通用映射规程对对应的光通道数据支路单元进行解映射处理；
    如果所述CPRI业务为与所述参考时钟业务采用不同时钟源的CPRI业务，则通过异步通用映射规程对对应的光通道数据支路单元进行解映射处理。
  19. 根据权利要求15至18任一项所述的数据解析的方法，其特征在于，
    所述获取每路所述CPRI业务对应的CPRI起始帧的位置信息，具体包括：
    获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧的位置信息；
    或者
    识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息。
  20. 根据权利要求15-19任一项所述的数据解析的方法，其特征在于，获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧之后，所述方法还包括：
    对每路所述CPRI业务对应的所有CPRI基本帧进行编码处理。
  21. 一种数据承载的装置，其特征在于，所述装置包括：
    接收单元，用于接收m路通用公共无线接口CPRI业务，其中，m为大于1的整数；
    映射单元，用于将接收到的m路CPRI业务以一对一的方式映射到m路光通道数据支路单元中；
    复用单元，用于将携带了所述CPRI业务的m路光通道数据支路单元复用到光通道净荷单元的时隙中；
    其中，所述时隙的速率等于CPRI基本速率。
  22. 根据权利要求21所述的装置，其特征在于，
    所述装置还包括处理单元，用于：
    根据每路所述CPRI业务的速率和单个所述时隙的速率，确定所述m路CPRI业务所需要的时隙的第一数量；
    选取包含所述第一数量的时隙的所述光通道净荷单元。
  23. 根据权利要求22所述的装置，其特征在于，所述处理单元选取的所述光通道净荷单元为n倍预设速率的光通道净荷单元，所述n倍预设速率的光通道净荷单元由n个光通道净荷单元逻辑支路按照预设字节间插复用形成；
    单个所述光通道净荷单元逻辑支路包括开销区和净荷区，净荷区包括预设的第二数量的所述时隙；
    所述n的取值根据所述第一数量与第二数量的比值确定。
  24. 根据权利要求21-23任一项所述的装置，其特征在于，所述映射单元，具体用于：
    将第一路所述CPRI业务确定为参考时钟业务，所述第一路CPRI业务为所述m路CPRI业务中的任意一路；
    将所述参考时钟业务以及与所述参考时钟业务采用相同时钟源的CPRI业务通过比特同步映射规程或者同步通用映射规程一一对应的映射入所述光通道数据支路单元中；
    将与所述参考时钟业务采用不同时钟源的CPRI业务通过异步通用映射规程一一对应的映射入所述光通道数据支路单元中。
  25. 根据权利要求21-24任一项所述的装置，其特征在于，所述复用单元，还用于：
    在复帧指示的值为0的光通道净荷单元的帧结构的开销区增加净荷类型指示，所述净荷类型指示用于表示所述光通道净荷单元当前承载的业务类型为多路CPRI业务；
    在复帧指示的值为2至复帧指示的最大值的光通道净荷单元的 帧结构的开销区增加复用结构指示，相邻的两帧的复用结构指示用于表示当前时隙是否被占用、当前时隙承载的CPRI业务类型、CPRI业务或CPRI业务组的标识。
  26. 根据权利要求21-25任一项所述的装置，其特征在于，所述装置还包括分组单元，具体用于：
    将采用相同时钟源且业务类型相同的至少一路CPRI业务确定为一组业务；
    当确定出的一组业务中包括至少两路CPRI业务时，将所述至少两路CPRI业务比特或字节复用为一路串行比特流。
  27. 根据权利要求21-26任一项所述的装置，其特征在于，所述光通道净荷单元中单个时隙的带宽为CPRI选项1编码前的带宽；
    所述装置还包括解码单元，具体用于：
    对待承载的所述m路CPRI业务进行解码，得到解码后的所述m路CPRI业务。
  28. 根据权利要求21-27任一项所述的装置，其特征在于，所述映射单元，还用于：
    分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
    分别将所述指针开销信息存储至对应的光通道数据支路单元的开销区。
  29. 根据权利要求21-27任一项所述的装置，其特征在于，所述映射单元，还用于：
    分别生成与每路所述CPRI业务对应的指针开销信息，所述指针开销信息用于指示解码后的每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置；
    分别将所述指针开销信息存储至所述光通道净荷单元的复用结构指示中。
  30. 根据权利要求21-27任一项所述的装置，其特征在于，所述处理单元，还用于：
    分别添加与每路CPRI业务对应的CPRI起始帧帧头开销，所述CPRI起始帧帧头开销至少包括用于指示每路所述CPRI业务的起始帧在对应的所述光通道数据支路单元的位置的帧头指示信息。
  31. 根据权利要求21-30任一项所述的装置，其特征在于，所述复用单元还用于：
    将已承载所述m路CPRI业务的所述光通道净荷单元添加光通道传输单元开销，构成光通道传输单元。
  32. 数据解析的装置，其特征在于，所述装置包括：
    获取单元，用于根据所述光通道净荷单元的开销区携带的信息，获取所述光通道净荷单元承载的业务类型；
    确定单元，用于当所述业务类型为包括m路CPRI业务的CPRI混合业务时，确定与所述m路CPRI业务一一对应的m路光通道数据支路单元；
    解映射单元，用于根据每路所述光通道数据支路单元中携带的映射开销信息，对每路光通道数据支路单元进行解映射处理，得到每路CPRI业务对应的至少两个CPRI基本帧；
    所述获取单元，还用于获取每路所述CPRI业务对应的CPRI起始帧的位置信息，得到自所述CPRI起始帧开始的所有CPRI基本帧，所述CPRI起始帧为第一个CPRI基本帧。
  33. 根据权利要求32所述的数据解析的装置，其特征在于，
    所述获取单元，具体用于：
    获取所述光通道净荷单元的开销区携带的净荷类型指示信息，根据所述净荷类型指示信息，得到所述光通道净荷单元承载的业务类型。
  34. 根据权利要求32或33所述的数据解析的装置，其特征在于，所述确定单元，具体用于：
    获取所述光通道净荷单元的开销区携带的净荷结构指示信息，根据所述净荷结构指示信息得到所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识；
    根据所述光通道净荷单元的各个时隙是否被占用以及被占用的时隙承载的CPRI业务的类型和CPRI业务的标识，识别与所述m路CPRI业务一一对应的m路光通道数据支路单元。
  35. 根据权利要求32至34任一项所述的数据解析的装置，其特征在于，所述解映射单元，具体用于：
    根据每路所述光通道数据支路单元中携带的映射开销信息，得到对应的每路CPRI业务的时钟源信息；
    当所述CPRI业务为所述参考时钟业务或者与所述参考时钟业务采用相同时钟源的CPRI业务时，通过比特同步映射规程或者同步通用映射规程对对应的光通道数据支路单元进行解映射处理；
    当所述CPRI业务为与所述参考时钟业务采用不同时钟源的CPRI业务时，通过异步通用映射规程对对应的光通道数据支路单元进行解映射处理。
  36. 根据权利要求32至35任一项所述的数据解析的装置，其特征在于，
    所述获取单元，具体用于：
    获取每路CPRI业务对应的指针开销信息，得到每路所述CPRI业务对应的CPRI起始帧的位置信息；
    或者
    识别每路CPRI业务对应的CPRI起始帧帧头开销，得到每路所述CPRI业务对应的CPRI起始帧的位置信息。
  37. 根据权利要求32-36任一项所述的数据解析的装置，其特征在于，所述装置还包括编码单元，具体用于：
    对每路所述CPRI业务对应的所有CPRI基本帧进行编码处理。
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