CN101729940A

CN101729940A - Method for sending data to multiple communication channels and method for receiving data

Info

Publication number: CN101729940A
Application number: CN200810218688A
Authority: CN
Inventors: 钟其文; 向晖; 田大锋; 高伟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2010-06-09
Anticipated expiration: 2028-10-22
Also published as: CN101729940B

Abstract

The invention provides a method and a device for sending data to multiple communication channels. The method comprises the following steps of: according to a split granularity no less than the number of bytes of a frame alignment indicating field FAS, evenly splitting each data frame of the data into an integral number of data blocks; regularly distributing the data blocks of the data to the multiple communication channels so as to make the data blocks, containing the frame alignment information of the data frames, regularly appeared on the multiple communication channels; and sending the data blocks of the data by the multiple communication channels. Correspondingly, the invention also provides a method and a device for receiving the data, and a method and a system used in the multiple communication channels to send the data. By the devices and the methods, a receiving end can recover the data sent by the sending end according to the data blocks containing the frame alignment information of the data frames, and the OTUk signal can be transmitted at a long distance by a 10G wave division transmission system of the conventional optical transmission network and can also be transmitted in at a short distance at low cost by 100G and 40G Ethernet transmission systems.

Description

Method for transmitting data to multiple communication channels and method for receiving data

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for sending data to multiple communication channels in an optical network, a method and an apparatus for receiving data from multiple communication channels, and a method and a system for transmitting data in multiple communication channels.

Background

In an Optical Transport Network (OTN), an information structure on an Optical Transport communication Channel is defined and is called an Optical Transport Unit (OTUk).

Fig. 1 is a data frame structure of a conventional optical transmission unit. Referring to FIG. 1, the first 14 bytes are overhead area of OTUk, which contains 6 bytes of Frame Alignment indication field (FAS: Frame Alignment Signal) and 1 byte of MultiFrame Alignment indication field (MFAS: MultiFrame Alignment Signal); and other overhead bytes, including in particular a Section Monitoring byte (SM), a General Communication path byte (GCC 0: General Communication Channel) and two Reserved bytes (Res: Reserved).

The transmission rule of the optical transmission unit is that the high bit of the byte is transmitted first for row-by-row and column-by-column transmission. The data frames are transmitted frame by frame, and the MFAS byte in the frame overhead is incremented from 0-255 in a cycle of 256 frames. The OTN interface rate of the transport optical transport unit in the current transport network is classified into several classes: OTU1 is approximately equal to 2.5G (gigabits per second, Gbit/s); OTU2 is equal to about 10G; OTU3 equal to about 40G; the newly defined OTU4 is approximately equal to 112G. Their data frame structures are consistent and the rates are increasing.

The currently defined 100GE (ethernet with an interface rate of 100 gbit/s) and 40GE consider mainly the implementation of inverse multiplexing. The following specifications are mainly provided: 10x10G and 4x25G enable 100GE transfers; the 4x10G enables 40GE transfer. Inverse multiplexing refers to a transmission mode in which a source end splits high-speed data into a plurality of low-speed channels for parallel transmission, and then performs combination recovery at a receiving end to restore the high-speed data. A unified architecture for 20-channel inverse multiplexing is employed for 100 GE. And multiplexing the 20 channels of data onto 10x10G and 4x25G optical modules according to a bit map for transmission. For 40GE, a unified architecture of 4-channel inverse multiplexing is adopted.

In an existing optical transport network, an OTUk (k ═ 3, 4) data frame is split into 16-byte or 8-byte data blocks, the data blocks are distributed to multiple communication channels, and reserved bytes in OTUk (k ═ 3, 4) frame overhead or the last byte of FAS are used to carry a channel number, so that the OTUk is transmitted on a 40GE or 100GE optical module. The receiving end carries out boundary framing according to FAS on each channel, carries out delay compensation alignment according to the FAS and MFAS boundary frames, and then identifies the channel according to the carried channel number, thereby carrying out data combination recovery.

However, the inventors have analyzed that the reserved byte or the last byte of the FAS used in this method carries the channel number flag, which causes the data integrity of the original signal to be lost. In particular, in current networks, different vendors have different applications for such reserved bytes, and thus this approach has compatibility issues. Using the last byte of FAS to carry it also results in degradation of framing performance.

In addition, a 10G optical Wavelength Division Multiplexing (WDM) transmission system has been popularized, and a 40G transmission system is gradually being put into commercial use. Because of being limited by the influence of key factors such as fiber dispersion and nonlinearity which restrict the communication speed and distance, some existing fiber transmission systems cannot directly transmit high-speed data signals, for example, the original 10G wavelength division transmission system cannot support 40G transmission, or some deployed 40G systems cannot support 112G OTU4 transmission. In addition, high-speed customer data signal transmission services (such as 40GE and 100GE customer data signals) need to be considered to be transmitted on the existing network (for example, 10G WDM transmission system), and at present, no scheme for directly transmitting OTU3 and OTU4 data signals on the 10G WDM transmission system exists.

Disclosure of Invention

Embodiments of the present invention provide a method and an apparatus for sending data to a multi-channel communication channel, a method and an apparatus for receiving data from a multi-channel communication channel, and a method and a system for transmitting data in a multi-channel communication channel, so that OTUk signals can be transmitted in an existing optical transmission network by using an inverse multiplexing technique, and a problem that a frame fixing performance of data is degraded or data integrity is affected when a receiving end recovers data is avoided.

The embodiment of the invention provides a method for sending data to a multi-channel communication channel, wherein the data consists of a plurality of data frames of optical transmission units, and the method comprises the following steps:

according to the splitting granularity, uniformly splitting each data frame of the data into an integer number of data blocks, wherein the splitting granularity is not less than the byte number of a frame positioning indication field FAS;

regularly distributing data blocks of the data to the multi-channel communication channel so that the data blocks containing the frame positioning information of the data frames in the data blocks of the data regularly appear on the multi-channel communication channel;

the data block of data is transmitted through the multiple communication channel.

The embodiment of the invention also provides a device for sending data to the multi-channel communication channel, which comprises:

the splitting module is used for uniformly splitting each optical transmission unit data frame of the data into a plurality of data blocks according to the splitting granularity, wherein the splitting granularity is not less than the byte number of a frame positioning indication field FAS;

and the distribution module is used for sequentially distributing the split data blocks to the multi-path communication channel according to the sequence of the data blocks in the data so that the data blocks containing the frame positioning information of the data frames in the data blocks regularly appear on the multi-path communication channel, and sending the data blocks of the data through the multi-path communication channel.

the distribution module is used for distributing the split data blocks to the multi-channel communication channels in sequence according to the sequence of the data blocks in the data;

and the second adjusting module is used for adjusting the positions of the data blocks on the multi-path communication channel according to the inverse multiplexing recovery requirement so that the data blocks containing the frame positioning information of the data frames in the data blocks regularly appear on the multi-path communication channel, and transmitting the adjusted data blocks through the multi-path communication channel.

The embodiment of the invention also provides a method for receiving data from the multipath communication channel, which is used for receiving the data sent by the method for sending the data to the multipath communication channel, and the method comprises the following steps:

and receiving data consisting of the data blocks, and recovering the data according to the data blocks of the data, which contain the frame positioning information of the data frame.

Accordingly, an embodiment of the present invention further provides an apparatus for receiving data from a multi-path communication channel, for receiving data sent by the apparatus for sending data to the multi-path communication channel of the embodiment of the present invention, where the apparatus includes:

and the data recovery module is used for recovering the data according to the data block of the data, which contains the frame positioning information of the data frame.

The embodiment of the invention also provides a system for transmitting data by a plurality of communication channels, which comprises: an apparatus for transmitting data to and receiving data from a plurality of communication channels, wherein the apparatus for transmitting data to the plurality of communication channels comprises:

the distribution module is used for sequentially distributing the split data blocks to a multi-path communication channel according to the sequence of the data blocks in the data so that the data blocks containing the frame positioning information of the data frames in the data blocks regularly appear on the multi-path communication channel and sending the data blocks of the data through the multi-path communication channel;

an apparatus for receiving data from a plurality of communication channels, for receiving data transmitted by an apparatus for transmitting data to a plurality of communication channels according to an embodiment of the present invention, the apparatus comprising:

and the second adjusting module is used for adjusting the positions of the data blocks on the multipath communication channel according to the inverse multiplexing recovery requirement so that the data blocks containing the frame positioning information of the data frames in the data blocks regularly appear on the multipath communication channel, and transmitting the adjusted data blocks through the multipath communication channel.

An embodiment of the present invention further provides a method for transmitting data in multiple communication channels, where the data is composed of multiple data frames of optical transmission units, and the method includes:

the sending end evenly splits each data frame of the data into an integer number of data blocks according to the splitting granularity, wherein the splitting granularity is not less than the byte number of a frame positioning indication field FAS;

the sending end regularly distributes the data blocks of the data to the multi-channel communication channels, so that the data blocks containing the frame positioning information of the data frames in the data blocks of the data regularly appear on the multi-channel communication channels; and transmitting data blocks of the data through the multi-channel communication channel;

the receiving end receives the data composed of the data blocks and recovers the data according to the data blocks of the data, wherein the data blocks contain the frame positioning information of the data frames.

The embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, each optical transmission unit data frame of the data is split into an integer number of data blocks with the splitting granularity not less than the byte number of the FAS, and the data blocks of the data are regularly distributed to the multi-channel communication channel for transmission, so that a receiving end can recover the data sent by a sending end according to the data blocks containing the frame positioning information of the data frame, the framing performance of the data is excellent during recovery, and the integrity of the data is also ensured.

On the basis of not influencing the existing optical transmission network and OTU signal structure, the embodiment of the invention enables the OTU3 signal to be transmitted by adopting a 40GE optical module of 4x10G, and the cost of the optical module compared with the existing traditional 40G optical module is reduced by using the optical module in scale; and the OTU4 signals can be transmitted by adopting 100GE optical modules of 10x10G and 4x25G, and the scale use of the optical modules further reduces the relative low cost of the optical modules.

Moreover, on the basis of not influencing the existing optical transmission network and OTU signal structure, the embodiment of the invention also enables the OTU3 signal and the OTU4 signal to be transmitted in a long distance on the existing 10GWDM transmission system, and even enables the OTU2 signal to be transmitted on the original 2.5G WDM transmission system.

Drawings

Fig. 1 is a data frame structure of a conventional optical transmission unit;

FIG. 2 is a schematic diagram of a system for transmitting data via multiple communication channels according to a first embodiment of the present invention;

FIG. 3 is a schematic diagram of an apparatus for transmitting data to multiple communication channels according to a second embodiment of the present invention;

FIG. 4 is a schematic diagram of an apparatus for transmitting data to multiple communication channels according to a third embodiment of the present invention;

FIG. 5 is a diagram illustrating the structure of an apparatus for receiving data from a multicast communication channel according to a fourth embodiment of the present invention;

FIG. 6 is a schematic diagram of data splitting according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the data in FIG. 6 being split and distributed to multiple communication channels;

fig. 8 is a schematic diagram of an apparatus for sending data according to an embodiment of the present invention, which is adjusted by a first adjustment method;

fig. 9 is a schematic diagram of an apparatus for sending data according to an embodiment of the present invention, which is adjusted by a second adjustment method and is adjusted before splitting;

fig. 10 is a schematic diagram of an apparatus for sending data according to an embodiment of the present invention, which is adjusted by a third adjustment manner and is adjusted after distribution;

fig. 11 is a diagram illustrating an apparatus for transmitting data according to an embodiment of the present invention, which is adjusted by a fourth adjustment method;

fig. 12 is a schematic diagram of the first character position after the device for sending data adjusts by a fifth adjustment manner according to the embodiment of the present invention;

fig. 13 is a schematic structural diagram of a capture module in an apparatus for receiving data according to a fifth embodiment of the present invention;

fig. 14 is a schematic structural diagram of a capture module in an apparatus for receiving data according to a sixth embodiment of the present invention;

fig. 15 is a schematic diagram illustrating a process of acquiring a relative number of a communication channel by an apparatus for receiving data according to an embodiment of the present invention;

fig. 16 is a flowchart illustrating a method for transmitting data to multiple communication channels according to a seventh embodiment of the present invention;

fig. 17 is a flowchart illustrating a method for transmitting data to multiple communication channels according to an eighth embodiment of the present invention;

fig. 18 is a flowchart illustrating a method for transmitting data to a plurality of communication channels according to a ninth embodiment of the present invention;

fig. 19 is a flow chart illustrating a method of receiving data from a multipath communication channel in a tenth embodiment of the present invention;

fig. 20 is a flowchart illustrating a method for transmitting data through multiple communication channels according to an eleventh embodiment of the present invention.

Detailed Description

The present invention will be described in further detail below with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of a system for transmitting data through multiple communication channels according to a first embodiment of the present invention. The data of the embodiment of the invention is composed of a plurality of optical transmission unit data frames. Referring to fig. 2, the system includes a device 1 for transmitting data to a multi-path communication channel and a device 2 for receiving data from the multi-path communication channel.

A device 1 for sending data to the multi-channel communication channel, which is used for dividing each optical transmission unit data frame of the data into an integer number of data blocks with the size not smaller than a frame positioning indication field FAS, regularly distributing the data blocks of the data to the multi-channel communication channel, so that the data blocks containing the frame positioning information of the data frame among the data blocks regularly appear on the multi-channel communication channel, and then sending the data blocks of the data to a device 2 for receiving the data from the multi-channel communication channel through the multi-channel communication channel

And the data receiving device 2 is used for receiving the data which is composed of the data blocks and is sent by the data sending device 1, and recovering the data according to the data blocks of the data, wherein the data blocks contain the frame positioning information of the data frames.

Fig. 3 is a schematic structural diagram of an apparatus for transmitting data to multiple communication channels according to a second embodiment of the present invention. Referring to fig. 3, a data transmission apparatus 1 according to an embodiment of the present invention includes: a splitting module 10, configured to split each optical transmission unit data frame in the data into an integer number of data blocks according to the splitting granularity; and a distribution module 12, configured to distribute the split data blocks to multiple communication channels 14(00, 0100, 01) in sequence according to the sequence of the data blocks in the data, so that the data blocks in the data blocks that include the frame positioning information of the data frame appear on the multiple communication channels regularly, and send the data blocks of the data through the multiple communication channels. The splitting module 10 and the distribution module 12 of the present embodiment may be provided as one module.

Generally, the overhead of the first 7 bytes in the OTUk data frame is: 6 bytes FAS and 1 byte MFAS. In the above method, the size of the split data block (called the split granularity) is required to be at least 6 bytes. After the data frame is split into data blocks according to the splitting granularity, the first data block (first character) of each frame is a data block containing frame positioning information of the data frame. The frame location information of the data frame refers to FAS, or FAS and MFAS.

In the embodiment of the invention, the data frame of the optical transmission unit is uniformly split according to the whole granularity, namely, one data frame can be just split into a whole number of data blocks according to the splitting granularity, so that each data block does not need to be marked. Thus, upon reception, the following data block can be determined based on the first data block of the data frame that contains the frame alignment information of the data frame.

Table 1 lists some optional granularity of splitting and the number of data blocks that can be obtained after a frame of OTUk data frame is split in the embodiment of the present invention. Table 1 also reflects the case where the split data block is circularly and uniformly distributed to 4-way communication channels, 16-way communication channels, 10-way communication channels, and 20-way communication channels. And part of the data blocks can be uniformly distributed, and a plurality of data blocks with the number less than that of the channels are remained after the part of the data blocks is distributed to each communication channel. The number of remaining data blocks, which has a special meaning, is called the first word channel hop span, and is marked with R. In table 1, a is the number of bytes or bits of a frame OTUk; x is the number of data blocks contained in each frame after division; b is the number of bytes or bits of the split granularity, and the minimum value is not less than 6 bytes (8 bits per byte); m is the number of channels of the adopted multi-channel communication channel, and in the embodiment of the present invention, the value of M is greater than 1 and is less than or equal to the multiframe positioning indication period value 256 of the OTUk.

Table 1 optional split granularity and distribution over a portion of a multi-path communication channel

Fig. 4 is a schematic structural diagram of an apparatus for transmitting data to multiple communication channels according to a third embodiment of the present invention. Referring to fig. 4, an apparatus 1 for transmitting data according to an embodiment of the present invention includes: a first adjusting module 13, a splitting module 10, a distributing module 12, a second adjusting module 14 and a storing module 16. The modules of the apparatus according to an embodiment of the present invention are described in detail below.

The first adjusting module 13 is configured to exchange positions of words containing frame positioning information of a data frame in a data frame of data with other words of the data frame according to a splitting granularity and an inverse multiplexing recovery requirement, and transmit adjusted data to the splitting module 10. In the embodiment of the invention, the byte number of the word containing the frame positioning information of the data frame and other words is equal to the splitting granularity.

Optionally, the first adjusting module 13 includes: the first adjustment control module 131 is configured to determine whether the requirement for inverse multiplexing recovery is met according to the split granularity and the number of channels of the multiple communication channels; and a first adjustment processing module 132, configured to, when the determination is yes, exchange positions of words containing frame positioning information of the data frame in the data frame of the data with other words of the data frame according to the splitting granularity and the inverse multiplexing recovery requirement, and transmit the adjusted data to the splitting module 10, and when the determination is no, directly transmit the data to the splitting module 10.

The splitting granularity of the embodiment of the present invention is set as needed, or may be preset and stored in the storage module 16. The storage module 16 is further configured to store the inverse multiplexing recovery requirement. The inverse multiplexing recovery requirement is specifically as follows:

taking the number of the channels of the multi-channel communication channel 14 as a period, in which a word containing frame positioning information of a data frame is distributed on each of the multi-channel communication channels 14; or,

the minimum natural number, which is greater than the number of channels of the multichannel communication channel 14 and is capable of dividing the period value of the multiple frame location indication field MFAS by an integer, is used as a period in which words containing frame location information of data frames are distributed on the multichannel communication channel 14.

A splitting module 10, configured to split each optical transmission unit data frame of the data into an integer number of data blocks according to the splitting granularity; and a distribution module 12, configured to distribute the split data blocks to multiple communication channels 14(00, 0100, 01) in sequence according to the sequence of the data blocks in the data.

In the embodiment of the present invention, if the first adjusting module 13 adjusts the data according to the inverse multiplexing recovery requirement, the data blocks distributed to the multi-path communication channel 14 by the distributing module 12, which contain the frame positioning information of the data frame, will appear on the multi-path communication channel 14 regularly. At this time, a data block of data is transmitted through the multiplex communication channel 14.

If the first adjusting module 13 does not perform the adjustment of the data and the distributing module 12 distributes the data blocks on the multi-path communication channel, the data blocks containing the frame alignment information of the data frame do not satisfy the condition that they regularly appear on the multi-path communication channel. Then the second adjusting module 15 is required to adjust the data blocks distributed onto the multi-way communication channel 14.

And a second adjusting module 15, configured to adjust, according to the inverse multiplexing recovery requirement, a position of the data block on the multiple communication channels, so that the data block, which includes the frame positioning information of the data frame, in the data block appears on the multiple communication channels regularly, and send the adjusted data block through the multiple communication channels 14.

Optionally, the second adjusting module 15 includes: a second adjustment control module 151 and a second adjustment processing module 152. The second adjustment control module 151 is configured to determine whether the data block distributed to the multiple communication channels 14 by the distribution module 12 meets the requirement for inverse multiplexing recovery; and a second adjustment processing module 152, configured to, when the determination result is that the data block is not satisfied, adjust the position of the data block on the multi-path communication channel 14 according to the inverse multiplexing recovery requirement, and transmit the adjusted data block through the multi-path communication channel 14, and when the determination result is that the data block is satisfied, directly transmit the data block through the multi-path communication channel 14 without performing adjustment. Wherein, the storage module 16 is configured to store the inverse multiplexing recovery requirement. The inverse multiplexing recovery requirement is specifically as follows:

taking the number of the channels of the multi-channel communication channel 14 as a period, in which a data block containing frame positioning information of a data frame is distributed on each of the multi-channel communication channels 14; or,

the minimum natural number, which is greater than the number of channels of the multichannel communication channel 14 and is capable of dividing the period value of the MFAS, is the period in which the data blocks containing the frame alignment information of the data frame are distributed on the multichannel communication channel 14.

It should be noted that, in the embodiment of the present invention, the first adjusting module 13 and the second adjusting module 15 in the device 1 for sending data are optional modules, and neither module may be provided, or one of the two modules may be provided, or both modules may be provided. When both modules are set in the device 1 for sending data, if the first adjusting module 13 performs adjustment on the data before data splitting, the second adjusting module 15 does not perform adjustment any more, and the data block is sent out through the second adjusting module 15. Similarly, if no adjustment is required for the data, neither of the

adjustment modules

13 and 15 in the device 1 sending the data performs no adjustment, and the data passes directly through the

adjustment modules

13 and 15 without any processing.

It should be noted that the multiple communication channels 14 according to the embodiment of the present invention include two channels. Specifically, the multiple communication channels in the device 1 for sending data are channels, and the data blocks are transmitted on the multiple communication channels after passing through the second adjusting module 15, which is called to be transmitted on the channels. If the data is adjusted before splitting, and the second adjusting module 15 is not provided in the device 1 for sending data, the distributing module 12 distributes the data blocks to the multiple communication channels for direct transmission on the channels. In the embodiment of the invention, the channel number is consistent with the channel number of the channel.

Fig. 5 is a schematic structural diagram of an apparatus for receiving data according to a fourth embodiment of the present invention. Referring to fig. 5, in the embodiment of the present invention, the data receiving apparatus 2 is configured to receive data composed of data blocks transmitted by the data transmitting apparatus 1 from multiple communication channels. The apparatus 2 for receiving data comprises a data recovery module 20, configured to recover the data according to a data block of the data, which includes frame alignment information of a data frame.

Further, the data recovery module 20 includes a capture module 22, a communication channel order reordering module 23, a delay compensation module 24, and a combined recovery module 26. Wherein:

the capturing module 22 is configured to capture frame positioning information of data frames carried in the data block, and determine an order relationship of the data block on the multiple communication channels in the receiving end according to the captured FAS field or MFAS field value.

In the embodiment of the present invention, the frame positioning information is specifically a frame positioning indication FAS field, or a frame positioning indication FAS field and a multiframe positioning indication MFAS field. The capture module 22 performs data frame synchronization on each communication channel based on the FAS field, thereby determining the boundary of the original data frame and the boundary of the split data block.

The capture module 22 captures the MFAS field value after the FAS field after establishing synchronization based on the FAS field. Then, the capture module 22 determines the channel numbers of the multiple communication channels in the device 2 for receiving data according to the absolute correspondence between the channel numbers of the multiple communication channels at the transmitting end and the MFAS values, and the channel numbers correspond to the channel numbers of the multiple communication channels at the transmitting end one by one, so as to determine the order relationship of the data blocks on the multiple communication channels.

Alternatively, the capture module 22 captures the MFAS field value after the FAS field after establishing synchronization according to the FAS field. The MFAS field value has a consistent increasing relationship with the channel number of the communication channel in which the MFAS field appears, and then the capture module 22 determines the relative channel number of the multiple communication channels in the device 2 for receiving data according to the increasing order of the MFAS field itself and the consistent increasing relationship (i.e., the distribution cycle order relationship of each communication channel at the sending end is known according to the MFAS value), thereby determining the order relationship of the data block on the multiple communication channels. In the embodiment of the invention, the main mode for determining the relative channel number of the multi-channel communication channel according to the MFAS value is as follows: the channel number of any communication channel in the current multi-channel communication channel is designated as 00, the MFAS value on the communication channel of the channel is captured, and then the channel number of each communication channel relative to the designated communication channel is determined according to the relationship between the MFAS value captured on other communication channels and the MFAS value captured on the designated communication channel.

Alternatively, if the receiving end compensates for the maximum differential transmission delay less than 1/2 times the transmission time of a data frame, the capture module 22 determines the relative lane numbers of the multiple communication lanes according to the sequence of the captured FAS field appearing on each communication lane of the receiving end, thereby determining the ordering relationship of the data blocks on the multiple communication lanes.

In the embodiment of the present invention, the main way of determining the relative channel number of the multiple communication channels according to the FAS field is as follows: when capturing the FAS, the channel number of the communication channel with the designated FAS field of the current path is 00, the channel number of the communication channel with the FAS field of the next path is 01, and so on until the FAS field of each communication channel of the multi-path communication channels appears, and the channel number is finished.

In this embodiment of the present invention, the capturing module 22 further provides control reference information to other modules, including: differential delay compensation phase information, channel number information, frame header indication information, etc.

The communication channel sequence rearrangement module 23 is configured to rearrange the multiple communication channels according to the channel numbers of the communication channels determined by the capture module 22. In the embodiment of the invention, each communication channel works independently, and the receiving end needs to identify the distribution cycle sequence of each communication channel so as to recover the original data. In particular, for the optical modules of 100GE and 40GE, after transmission, the order of each channel is randomly disordered and needs to be rearranged.

And the delay compensation module 24 is configured to control the delay compensation circuit according to the differential delay compensation phase information sent from the capture module 22, so as to implement differential transmission delay compensation alignment of the multiple communication channels. The differential delay compensation of the embodiments of the present invention is implemented by using the prior art, and will not be described in detail herein.

If the communication channel order rearrangement module 23 is not set in the device 2 for receiving data, the combination recovery module 26 is configured to recover the data according to the frame header indication information (including the boundary information of the data frame and the boundary information of the data block) transmitted by the capture module 22 and the sequence relationship of the data block on the multiple communication channels.

If the communication channel sequence rearranging module 23 is disposed in the device 2 for receiving data, the combination recovering module 26 is configured to obtain the data blocks from the rearranged multiple communication channels 14, and recover the data according to the frame header indication information (including the boundary information of the data frames and the boundary information of the data blocks) transmitted by the capturing module 22.

If the data is adjusted before being sent to the multiple communication channel. The apparatus 2 for receiving data according to the embodiment of the present invention further includes an adjustment restoring module 25, connected to the combination restoring module 26, for performing inverse adjustment control corresponding to the adjustment of the transmitting side on the combined data, so as to restore the original data.

Alternatively, the apparatus 2 for receiving data may perform inverse adjustment before the data blocks are combined by the combination restoration module 26, in which case the adjustment restoration module 25 is configured to perform inverse adjustment control corresponding to the adjustment on the transmitting side on the data blocks after the delay compensation, and then transmit the data blocks to the combination restoration module. The manner of this counter-regulation control may be pre-configured.

It should be noted that, in the embodiment of the present invention, the positions of the communication channel sequence rearrangement module 23 and the differential delay compensation module 24 may be exchanged, and the positions of the two do not affect the data recovery on the receiving side. In addition, the communication channel sequence rearrangement module 23 and the adjustment restoration module 25 can also be integrated into one module, and in this case, the integrated module is connected to the capture module 22 and the differential delay compensation module 24, respectively.

In the embodiment of the invention, a device 1 for sending data divides data into data blocks, sequentially distributes the data blocks to a plurality of communication channels according to the sequence of the data blocks in the data, judges whether the data blocks distributed to the plurality of communication channels meet the requirement of inverse multiplexing recovery, and if not, adjusts the positions of the data blocks on the plurality of communication channels according to the requirement of inverse multiplexing; if so, no adjustment is performed. The following is a detailed description by way of example.

First, the inverse multiplexing recovery requirement is that the number of channels of the multiplex communication channel is a period, in which the multiplex communication channel is distributed with a data block (first character) containing frame positioning information of the data frame.

(1) Without adjusting the position of the data block on the multiple communication channels

In this embodiment, the device 1 for sending data splits the data with a granularity of 64 bytes, and distributes the data through 4-way communication channels. FIG. 6 is a schematic diagram of data splitting according to an embodiment of the present invention. Fig. 7 is a schematic diagram of the data in fig. 6 after being split and distributed to multiple communication channels. Wherein the data blocks of one data frame are represented by word1, word 2. Referring to fig. 6 and 7, the first word appears on different communication channels with a period of 4 (the same as the number of channels), and this distribution can mark the phase relationship of the data blocks on each communication channel, thereby facilitating the data recovery at the receiving end.

In the embodiment of the invention, the splitting of the data frame and the number of the adopted inverse multiplexing channels accord with the following relationship:

MOD { A, (M × B) ═ B or

Formula (1.1)

MOD { a, (M × B) } ═ R × B or

Formula (1.2)

Wherein: MOD is a remainder operation; r represents the jump span of the first character channel and is a natural number which is smaller than M and has no common divisor with M; a is the number of bytes of each frame of the OTUk; x is the number of particles contained in each frame after splitting; b is the number of bytes of the splitting granularity, and the minimum value is more than 6 bytes; m is the channel number of the multi-channel communication channel, and the value is more than 1 and less than or equal to 256.

Wherein, in table 1, B is 64, M is 4, 16; b192, M4, 16; b320, M4, 16, 10, 20; b960, M4, 16, 10, 20; b-1088, M-4, 16; b-3264, M-4, 16; b5440, M4, 16, 10, 20; when B is 16320 and M is 4, 16, 10, 20, the data may not be adjusted.

For the case that the data is split by 64 bytes and distributed through the 4-way communication channel, the process of the data recovery module 20 of the data receiving apparatus 2 of this embodiment to recover the data includes the following steps: after capturing the first word carrying the FAS and the MFAS, the capturing module 22 obtains the channel number of the communication channel receiving the first word according to the MFAS value of the first word. The channel number corresponds to a channel number of a communication channel of the transmitting end (hereinafter referred to as a source-side channel number). Because the data is split at 64 byte granularity, when the 4-channel communication channel is distributed, the MFAS value and the source end channel number have an absolute corresponding relationship, see table 2, so that the source end channel number corresponding to each channel of communication channel at the receiving end can be known according to MOD (MFAS, 4). Similarly, in the embodiment of the present invention, when data is split at other granularities and an M-channel communication channel is distributed, the receiving end may also learn the source end channel number corresponding to each channel of communication channel in this way.

TABLE 2

After the device 2 for receiving data captures the channel numbers of the multiple communication channels based on the MFAS values appearing on the communication channels, the order relationship of the data blocks of the data on the multiple communication channels can be determined, and the data can be recovered.

(2) Adjusting the position of data blocks on multiple communication channels

In the embodiment of the present invention, a parameter channel hop span cycle value k is determined according to the number of channels and the channel hop span of the multiple communication channels, and is used to indicate a channel interval where two consecutive first characters are located after uniform distribution. When adjusting the data block, the adjustment is performed by taking the cycle value k of the channel hop span as an adjustment unit. This kind of adjustment mode is called channel hop span cycle value packet rotation mode (also called k frame packet rotation mode), and specifically:

the position of the data block in the channel hop span cycle value on each communication channel (for example, the data block on the communication channel 00 is moved to the communication channel 01) is moved according to the inverse multiplexing recovery requirement by taking the channel hop span cycle value as an adjustment unit, so that the position of the first character of the data frame is changed from the current communication channel to other communication channels, and the technology represents that the data flow is rotated.

The following examples are specifically described below. Fig. 8 is a schematic diagram of an apparatus for transmitting data according to an embodiment of the present invention, which performs adjustment by using a first adjustment method. Wherein the data blocks of a data frame are represented by word1, word 2. Referring to fig. 8, after an OTU data frame is distributed to 127 data blocks per communication channel of 510 bytes of 32 bytes on a 4-channel communication channel according to 32 bytes, 2 data blocks of 32 bytes (channel hop span) remain, and 1020 data blocks of 32 bytes of two frames of data can be uniformly distributed to the 4-channel communication channel, wherein first word (1) containing FAS and MFAS only appears on

communication channels

00 and 02, and the remaining communication channels cannot see the first word, which cannot meet the requirement of inverse multiplexing recovery that each communication channel distributes one first word in a period. And (3) taking the value of the channel hopping cycle value k as 2, and performing distribution adjustment by adopting a k-frame grouping rotation mode (B is 32, R is 2, and k is 2). In this embodiment, the channel hop span R is 2, the channel hop span cycle value k is 2 (frame), and the cycle in the inverse multiplexing requirement is used as the adjustment cycle, and in this embodiment, the adjustment cycle is equal to 4 channels. There are 2 sets of channel skip cycle values in one adjustment period 4, the first set not rotating and the subsequent set rotating one step. Repeated in this way, the first character will appear on the 00 th, 02 th, 01 th, 03 th communication channel in turn. After adjustment, the data block can satisfy the inverse multiplexing recovery request. Referring to table 3, the MFAS value has an absolute correspondence with the source end channel number of the communication channel, so that the source end channel number corresponding to each communication channel of the receiving end can be directly obtained according to MOD (MFAS, 4).

TABLE 3

In the embodiment of the present invention, except for (1) the enumerated values of B and M without performing distribution adjustment on data, other granularity splitting distribution situations are similar to the situation that an OTU data frame is distributed to 4 communication channels according to 32 bytes, and the following relationships are satisfied:

MOD { a, (M × B) } ═ R × B formula (2.1)

MOD { a, (M × B) } ═ 0 formula (2.2)

Wherein: MOD is a remainder operation; a represents the number of bytes of each frame of the OTUk; m represents the channel number of the multi-channel communication channel; b represents the number of bytes of the resolution granularity; r represents the first-character channel hop span, where R is a natural number less than M that has a common divisor with the number of communication channels distributed.

Formula (2.1): for the case where R ≠ 0 and R and M have the least common multiple (k × R), there is the case of MOD { (k × R), M) } 0, which means that data distribution of the minimum k optical transport unit (OTUk) data frames can be just distributed equally to each communication channel, and the first word in the OTUk data frame appears on a specific communication channel with the period of k OTUk data frames. Let k be the channel hop span cycle value (in OTU frames).

Formula (2.2): for the case where R ═ 0, the first word always appears on a certain communication channel. Obviously, the cycle value of channel hop span is k ═ 1 (frame).

For example, the OTU data frame is divided by 16 bytes: each row of 4080 bytes may be divided into 255 16-byte blocks, and 4 rows are divided into a total of 1020 16-byte data blocks. The 1020 data blocks of 16 bytes can be uniformly distributed to 10-path and 20-path communication channels, and can also be uniformly distributed to 4-path communication channels. The first word is always distributed to the communication channel 00 of the source local marker. The first word is not visible on the remaining communication channels. The adjustment period can be adjusted according to a k-frame grouping rotation mode (B is 16, R is 0, and k is 1), and the adjustment period is equal to the channel number M.

It can be appreciated that 1020 data blocks of 16 bytes cannot be evenly distributed over the 16-way communication channel. Each frame is distributed with 12 data blocks remaining, so that the first channel hop span R is 12 and the channel hop span cycle value k is 4 (frame). At the time of distribution, the next first character appears on the 12 th channel after the communication channel in which the current first character appears. This is repeated, after 4 frame periods, again, on the same four-way channel, the first Word (1) appears again. The remaining 12 communication channels do not see the frame header and multiframe indication. In this embodiment, the adjustment may be performed in a k-frame packet rotation manner (B is 16, R is 12, and k is 4), where the adjustment period is equal to the channel number M.

Optionally, the device 1 for sending data may also adopt a mode of adjusting data before splitting. According to the resolution granularity and the inverse multiplexing recovery requirement, the position of a word containing the frame positioning information of the data frame in the data frame of the data is exchanged with other words of the data frame. The byte number of the word containing the frame alignment information of the data frame and the other words is equal to the split granularity, the byte number of the word containing the frame alignment information of the data frame is equal to the byte number of the split data blocks, and the words are the first data blocks of the data frame, so the words are also called first words. The method for adjusting data before splitting is called an initial frame intra-frame exchange shift method, and specifically comprises the following steps:

and determining a channel hop span cycle value according to the split granularity and the number of the channels of the multi-channel communication channel. And exchanging the first character of the data frame in the channel jump span cycle value with other characters in the data frame according to the inverse multiplexing recovery requirement by taking the channel jump span cycle value as an adjusting unit. The following examples are specifically described below.

In the embodiment of the present invention, data is split by a granularity of 16 bytes, and is distributed through a 4-way communication channel, where a channel hop span R is 0, a cycle value k of the channel hop span is 1 frame, and an adjustment period is 4 frames. Fig. 9 is a schematic diagram of an apparatus for sending data according to an embodiment of the present invention, which performs adjustment by using a second adjustment method and is adjustment before splitting. The data is adjusted before splitting and the position of the data block on each communication channel is adjusted after distribution. Here, an embodiment of post-distribution adjustment is also given. Fig. 10 is a schematic diagram of an apparatus for sending data according to an embodiment of the present invention, which performs adjustment by using a third adjustment method and performs adjustment after distribution. In fig. 10, only the first four data blocks of a frame are shown, which are represented by word1.1, word1.2, word1.3, and word1.4, and the rest of the data blocks are represented by ellipses. Referring to fig. 9, in the adjustment process, the period in the inverse multiplexing requirement is used as the adjustment period, and the first frame is exchanged with the position where the first frame is located, and does not move actually, so that the first character appears on the communication channel 00 after distribution; the first word of the second frame exchanges positions with the second word of the frame and the first word of the data frame is then present on communication channel 01. So as to reciprocate. By the fifth frame, the first character is in its own place, actually starting another adjustment cycle.

Referring to fig. 9 and fig. 10, in the embodiment of the present invention, through adjustment of the adjustment mode before splitting or the adjustment mode after distribution, the positions of the data blocks on each communication channel are the same, and the requirement of inverse multiplexing recovery is satisfied. Due to the adjustment and restoration requirements of the receiving end, the initial frame intra-frame exchange shift mode is suitable for the cases where the adjustment period is an integer power of 2 and the number of channels is less than or equal to the MFAS period 256, specifically 2, 4, 8, 16, 32, and.

As shown in table 4, when data is split at a granularity of 16 bytes and distributed through a 4-way communication channel, the channel number can be directly obtained by MOD (MFAS, 4), and the identification method is very simple.

TABLE 4

Second, the inverse multiplexing recovery is required to be periodic by the smallest natural number which is larger than the number of channels of the multiplex communication channel and is capable of dividing the period value of the MFAS by the whole number, and in this period, the first character is distributed on the multiplex communication channel.

In the embodiment of the invention, the number of the channels is selected to be more than or equal to the number of the channels according to the number of the channels of the multi-channel communication channel actually adopted in transmission, and the minimum natural number which can divide the MFAS multiframe period value completely is used as the adjusting period for adjustment. A specific optional adjustment period is 2, 4, 8, 16, 32,.. 256. For example, 20 communication channels, the optional adjustment period is 32; for the case of 10 communication channels, the optional adjustment period is 16; and so on. In the embodiment of the present invention, the adjustment mode is referred to as a cycle extension adjustment mode.

Fig. 11 is a diagram illustrating that the apparatus for transmitting data performs adjustment by a fourth adjustment method according to the embodiment of the present invention. Fig. 11 shows only the first 10 data blocks of a frame, which are represented by word1.1, word1.2, word1.3,. and word1.10, and other data blocks are represented by ellipses. Referring to fig. 11, data is split at a granularity of 16 bytes and distributed over a 10-way communication channel. Each frame may be divided into 1020 data blocks. The first words are all present on communication channel 00. According to the rule for selecting the adjustment period, the present embodiment selects 16 as the adjustment period. The adjustment operation may be performed in the aforementioned first frame intra-switching shift manner or k frame packet rotation manner, or may be performed in other manners.

As an example, fig. 11 selects to adjust the first 10 frames of the determined adjustment period 16 according to the k-frame grouping rotation manner (the first 3 frames and the 10 th frames are shown in fig. 11, and other frames are indicated by ellipses), and the last 6 frames do not participate in the adjustment (the 11 th frames and the 16 th frames are shown in fig. 11, and other frames are indicated by ellipses). The first character of the last 6 frames in each adjustment cycle does not participate in the inverse multiplexing recovery control of the receiving end, and when data recovery is performed, the last 6 frames are all considered as data information (including the first character in the last 6 frames). Table 5 shows the absolute correspondence relationship between the MFAS value and the multiple communication channels when the data is split at 16-byte granularity and distributed through 10-channel communication channels when the period expansion adjustment is performed. Wherein the source end number of the communication channel can be determined according to the MFAS value of the first 10 frame initials in the adjustment period. The channel number is MOD { [ MOD (MFAS, adjustment period) ], and the channel number is MOD { [ MOD (MFAS, 16) ], 10 }. The MFAS value of the first 6 frames does not participate in the operation.

TABLE 5

Optionally, when the embodiment of the present invention adopts the periodic extension adjustment mode for adjustment, the position of the first character on the communication channel may also be other laws. For example, when data is split at a granularity of 16 bytes and distributed through a 20-way communication channel, the adjustment period is 32 after the period is extended, and the asymmetric rotation adjustment can be performed within the adjustment period. The first word occurs at least once on each channel and repeats according to the adjustment period. Fig. 12 is a schematic diagram of the first character position after the device for sending data adjusts by the fifth adjustment method according to the embodiment of the present invention. Referring to fig. 12, each cell represents a 16-byte data block, with the first numbered data block. Only the first 20 data blocks of each frame are shown in fig. 12, corresponding to one column on fig. 12. During adjustment, the first 24 frames of data within the period (32) are adjusted, and every 2 frames are further rotated. For the data frame with MFAS being 0 and 1, the first word is distributed to the communication channel 00, the distribution of the data blocks is performed according to the

communication channel sequence

00, 01, 02.. 19, and the distribution of the 2 frames of data frames is repeated, and so on. For the frame of MFAS 24. Frame 31, the first on the communication channel 19, the other data blocks are distributed on the communication channel, the cyclic order of the channel numbers is 19, 00, 01.. 18. After adjustment, the same MFAS value is not distributed to different communication channels, and thus can be used to identify the channel number. E.g., on communication channel 00, MFAS ═ 0, 1, (0+32), (1+32), a. Of course, it can also select the switching shift adjustment mode in the initial frame according to the rule to perform adjustment.

It should be noted that, in the embodiment of the present invention, when the number of channels of the multiple communication channels is not an integral power of 2 and cannot be divided by 256, if the adjustment is performed by using the intra-first-frame swap shifting method, a period expansion adjustment method needs to be used. At this time, the correspondence between the source-end channel number of the communication channel and the MFAS value is not unique, that is, there is no absolute correspondence, and the adjustment and restoration of the receiving end can be supported by using the combination of the cyclic extension adjustment and the first-character intra-frame exchange shift mode.

The device 2 for receiving data according to the embodiment of the present invention recovers the original data according to the frame positioning information in the received data block, including one of the following ways:

firstly, data recovery is carried out according to the absolute corresponding relation between the MFAS value and the source end channel number

This embodiment describes a process of data recovery by taking, as an example, a data block whose reception granularity is 64 bytes and which is split and distributed through a 4-way communication channel.

Fig. 13 is a schematic structural diagram of a capture module in an apparatus for receiving data according to a fifth embodiment of the present invention. Referring to fig. 13, the capture module 22 includes:

a channel FAS synchronization and MFAS capture module 220, configured to capture the FAS field and perform periodic synchronization on the channel according to the FAS field, so as to determine the boundary of the original data frame and the boundary of the split data block. The OTN FAS comprises 6 bytes, specifically bytes one to six (denoted B1-B6): FAS-B1, FAS-B2, FAS-B3, FAS-B4, FAS-B5 and FAS-B6. FAS-B1 ═ FAS-B2 ═ FAS-B3 ═ 0xF 6; FAS-B4 ═ FAS-B5 ═ FAS-B6 ═ 0x 28. The channel FAS synchronization and MFAS acquisition module 220 first detects FAS in the data stream and determines that FAS on the communication channel is present periodically if there is no data error. The channel FAS synchronization and MFAS acquisition module 220 detects FAS for c (e.g., 8) consecutive cycles, and enters a synchronization-locked state. When the FAS is not detected at the expected position in the locked state, the synchronization state is deduced and synchronization needs to be performed again. In the synchronized state, the channel FAS synchronization and MFAS capture module 220 may extract the subsequent MFAS value directly after FAS. An absolute channel number obtaining module 222, configured to obtain, after receiving the information content of the captured MFAS field, a source-end channel number corresponding to the communication channel according to an absolute correspondence between the source-end channel number of the communication channel and the MFAS value;

a delay compensated phase identification module 224 for generating delay compensated phase information for the communication channel.

In this embodiment, the FAS synchronization and MFAS capture modules of each communication channel work independently without affecting each other, and there is no interaction between the communication channels.

In implementation, the capturing module corresponding to each communication channel can determine the channel number of the multi-channel communication channel at the receiving end, that is, determine the order relationship of the data on the multi-channel communication channel, according to the captured MFAS value and the corresponding relationship between the MFAS value and the source channel number.

The communication channel sequence rearrangement module 23 rearranges the multiple communication channels according to the channel numbers of the communication channels in the multiple communication channels from the capture module 22, the data enters the delay compensation module 24 after rearrangement, the delay compensation module 24 performs delay compensation according to the channel delay compensation phase information from the capture module 22, and transmits the delayed data blocks to the combination recovery module 26, and finally the combination recovery module 26 performs combination recovery on the original data according to the boundary information.

Secondly, data recovery is carried out according to the relative corresponding relation of the serial numbers of the multi-channel communication channel and the source end channel

(1) And acquiring the relative channel number of the multi-channel communication channel of the receiving end according to the consistent increasing relationship between the value of the captured MFAS field and the channel number of the communication channel in which the MFAS field appears, and determining the order relationship of the data block on the multi-channel communication channel so as to recover the data.

Fig. 14 is a schematic structural diagram of a capture module in an apparatus for receiving data according to a sixth embodiment of the present invention. Referring to fig. 14, the capture module 22, taking a 20-way communication channel as an example, includes:

a channel FAS synchronization and MFAS acquisition module 220, configured to acquire the FAS field and perform periodic synchronization and generate boundary information for the channel according to the FAS field.

A relative channel number arbitration module 226, configured to arbitrate the relative channel numbers of the multiple communication channels according to a consistent increasing relationship between the captured MFAS field value and the channel number of the communication channel where the MFAS field value appears, and determine an order relationship of data on the multiple communication channels;

For the 10-channel and 20-channel communication channels, if the adjustment period is not extended, there is no absolute correspondence between the MFAS and the source-end channel number, which is not favorable for directly obtaining the source-end channel number on the multi-channel communication channel of the receiving end according to the MFAS value.

During data recovery, the capture module 22 captures MFAS fields on each communication channel independently, and the MFAS field information captured on all communication channels is sent to the arbitration module 226 for arbitration, and the arbitration module 226 analyzes and outputs relative channel numbers of multiple communication channels.

For example, when data is split by 16 bytes in granularity and distributed through a 20-way communication channel, k is 1, and the adjustment period is 20; or when the data is split by 16 bytes in granularity and distributed by a 10-way communication channel, k is 1, and the adjustment period is 10; alternatively, as shown in table 1, in other cases where the communication channels are distributed over 10 communication channels and 20 communication channels, and R is 0, the arbitration module 226 first selects one communication channel from M communication channels as the communication channel 00, captures the MFAS value from the communication channel, which is denoted as MFAS (0), and accordingly, the MFAS values of the remaining communication channels are denoted as MFAS (i). For a 256 OTU frame period range, MFAS (i) appears on a communication channel due to the increasing order of MFAS values, the number of the communication channel relative to communication channel 00 can be determined by the following relationship:

MFAS(i)＝MOD{[MFAS(0)+(M*i)]，M}

it should be noted that, since the value cycle of the MFAS is 256, it is necessary to complete the identification and capture of the relative channel number of the communication channel in this cycle, and the same MFAS value may appear on different communication channels beyond this cycle.

Data combining may then be performed according to the distribution granularity of the data blocks, the channel delay compensation phase information, and the ordering relationship of the data over the multiple communication channels. And then the adjustment and restoration module 25 adjusts and restores the combined data. It is also currently possible to perform a modified restoration of the data blocks before they are combined.

(2) And determining the sequence relation of the data blocks on the multi-path communication path according to the sequence of the FAS fields on the multi-path communication path, thereby recovering the data.

When OTU4 signals are transmitted by dividing 100GE optical modules into 20 channels of communication channels, especially in the case of short-distance transmission of 10km, 40km, etc., the differential transmission delay between the communication channels is relatively clear, and the difference between the fastest arriving signal and the slowest arriving signal is relatively small and much smaller than 510 bits. The requirement of the buffer storage resource corresponding to the delay compensation module is far less than the standard definition of 20 multiplied by 1024 bits; when the OTU3 signal is transmitted by dividing the 40GE optical module into 4-channel communication channels, the requirement of buffer storage resources is much less than 4 × 2048 bits defined by the standard.

In the embodiment of the present invention, when OTU data frames are transmitted on each communication channel, the occurrence of the first character on each communication channel is periodic, and this period is at least the period of one OTU frame, so that the interval between two occurrences of FAS on the same communication channel is at least the length of one OTU frame (16320b bytes or 130560 bits).

When OTU4 signals are divided into 20 channels on a 100GE optical module for transmission, FAS appears on the communication channel at an interval of 130560/20-6528 (bits), which is much larger than twice the maximum multi-channel differential transmission delay 1024 of the 100GE optical module. Therefore, according to FAS, sufficient phase marking capability can be provided, and the differential propagation delay compensation capability supported by the phase marking capability is far greater than the standard requirement of 100 GE. Simply put, the largest differential delay does not change the order in which FAS appears on each communication path.

Fig. 15 is a schematic diagram of a process of acquiring a relative number of a communication channel by an apparatus for receiving data according to an embodiment of the present invention. Referring to fig. 15, for the case where data is split at 16-byte granularity and distributed through 20-way communication channels, the arbitration module 226 can simply arbitrate according to the order in which FAS appears on each communication channel. Arbitration firstly determines one communication channel as a communication channel 00, identifies the source end data distribution sequence according to the sequence of the communication channels, and gives the relative number of each communication channel relative to the appointed communication channel 00.

Thus, data combination can be performed according to the granularity of the data block, the FAS field information, the channel delay compensation phase information, the order relationship of the data block on the multiplex communication channel, and the like.

This embodiment is particularly suitable for the case of splitting at 6 byte granularity and 51 bit granularity using the data in table 1.

On the basis of not influencing the existing network and OTU signal structure, the embodiment of the invention enables the OTU3 signal to be transmitted by adopting a 40GE optical module of 4x10G, realizes low-cost short-distance transmission, and reduces the cost of the optical module compared with the current traditional 40G optical module by using the optical module in scale; and the OTU4 signals can be transmitted by adopting 100GE optical modules of 10x10G and 4x25G, so that low-cost short-distance transmission is realized, and the scale use of the optical modules further reduces the relatively low cost of the optical modules.

Moreover, on the basis of not influencing the existing network and OTU signal structures, the embodiment of the invention also enables the OTU3 signal and the OTU4 signal to be transmitted in a long distance on the existing 10GWDM transmission system, and even enables the OTU2 signal to be transmitted on the original 2.5G WDM system.

Fig. 16 is a flowchart illustrating a method for transmitting data to multiple communication channels according to a seventh embodiment of the present invention. Referring to fig. 16, the method includes the steps of:

step S1601, according to the splitting granularity, each data frame of the data is evenly split into an integer number of data blocks. The configured splitting granularity is not less than the byte number of the frame positioning indication field FAS.

In the embodiment of the present invention, the overhead of the first 7 bytes in the OTUk data frame is: 6 bytes FAS and 1 byte MFAS. In the above method, the size of the split data block (called the split granularity) is required to be at least 6 bytes. The first data block (called the first word) of each frame contains at least frame location information (FAS, or FAS and MFAS).

Step S1602, regularly distributing the data blocks of the data to the multiple communication channels, so that the data blocks of the data blocks containing the frame positioning information of the data frame regularly appear on the multiple communication channels.

In step S1603, the data block of the data is transmitted through the multi-path communication channel.

The optional splitting granularity of the part of the method for sending data to the multi-channel communication channel and the number of data blocks obtained after splitting each frame of the corresponding OTUk can be seen in table 1. Table 1 also reflects the case where the split data block is uniformly distributed to 4-way communication channels, 16-way communication channels, 10-way communication channels, and 20-way communication channels. In the embodiment of the present invention, the range of the number of the multiple communication channels is: greater than 1 and less than or equal to 256.

Fig. 17 is a flowchart illustrating a method for transmitting data to multiple communication channels according to an eighth embodiment of the present invention. Referring to fig. 17, the method includes the steps of:

step S1701 evenly splits the data frame of data into an integer number of data blocks according to the split granularity. The configured splitting granularity is not less than the byte number of the frame positioning indication field FAS.

Step 1702, sequentially distributing the data blocks to the multiple communication channels according to the sequence of the data blocks in the data.

Step S1703, determine whether the data block meets the inverse multiplexing recovery requirement. If the determination is satisfied, step S1704 is performed. If it is determined not to be satisfied, step S1705 is performed. Here, whether or not to perform the determination is optional, and step S1705 may be directly performed without determining.

In step S1704, the data block is transmitted through the multi-channel communication channel.

Step S1705, adjusting the position of the data block on the multi-channel communication channel according to the inverse multiplexing recovery requirement.

Step S1706, the adjusted data block is sent through the multiple communication channels.

In this embodiment, the inverse multiplexing recovery requirement includes one of the following:

taking the number of channels of the multi-channel communication channel as a period, wherein a data block (first character) containing frame positioning information is distributed on the multi-channel communication channel in the period; or

The minimum natural number which is larger than the number of the channels of the multi-channel communication channel and can divide the MFAS period value by a whole number is taken as a period, and in the period, a data block containing the frame positioning information is distributed on the multi-channel communication channel.

In this embodiment, when it is determined that the adjustment is required, the channel hop span cycle value is determined according to the channel hop span and the number of channels of the multiple communication channels. The channel hop span is the number of the remaining data blocks after the data blocks of one data frame are uniformly distributed to the multi-channel communication channel, and represents the channel interval where two continuous first characters are located after uniform distribution. And taking the period in the inverse multiplexing recovery requirement as an adjustment period, and adjusting the position of the data block in the channel hopping span cycle value on the multi-channel communication channel by taking the channel hopping span cycle value as an adjustment unit in each adjustment period according to the inverse multiplexing recovery requirement.

The process and example of adjusting the data block in the method for sending data to multiple communication channels according to the embodiment of the present invention are described in detail in the detailed description of the adjustment after the data sending apparatus 1 according to the embodiment of the present invention distributes data in a k-frame packet rotation manner, and are not described herein again.

Fig. 18 is a flowchart illustrating a method for transmitting data to a plurality of communication channels according to a ninth embodiment of the present invention; referring to fig. 18, the method includes the steps of:

step 1801, determining whether to adjust the data according to the split granularity and the number of channels of the multi-channel communication channel. The split granularity is not less than the number of bytes of the frame location indication field FAS. When the determination is yes, step 1802 is performed. When the judgment is no, step 1803 is executed. Here, whether or not to perform the determination is optional, and the data may be directly adjusted without determining.

Step 1802, according to the split granularity and the inverse multiplexing recovery requirement, exchanging the position of the word containing the frame positioning information of the data frame in the data frame of the data with other words of the data frame. The number of bytes of the word containing the frame alignment information of the data frame and other words is equal to the split granularity. The inverse multiplexing recovery requirement is specifically as follows:

taking the number of channels of the multi-channel communication channel as a period, and distributing a word containing the frame positioning information of the data frame on the multi-channel communication channel in the period; or,

the minimum natural number which is larger than the number of the channels of the multi-channel communication channel and can divide the period value of the MFAS is used as the period, and words containing the frame positioning information of the data frames are distributed on the multi-channel communication channel in the period.

And during adjustment, determining a channel jump span cycle value according to the split granularity and the number of channels of the multi-channel communication channel. And exchanging the position of the word containing the frame positioning information of the data frame in the data frame with other words of the data frame according to the inverse multiplexing requirement for the data frame in the channel hopping span cycle value by taking the channel hopping span cycle value as an adjusting unit.

Step 1803, according to the splitting granularity, each data frame of the data is evenly split into an integer number of data blocks.

And 1804, regularly distributing the data blocks of the data to the multi-channel communication channels for sending.

Here, the data is already adjusted before being split, so that the data blocks are sequentially distributed to the multiple communication channels according to the sequence of the data blocks in the data, that is, the data blocks containing the frame positioning information of the data frame in the data blocks of the data can appear on the multiple communication channels regularly.

In the embodiment of the present invention, the manner and example of adjusting data are described in detail in the detailed description of the apparatus 1 for sending data according to the embodiment of the present invention, which adjusts data before the data is split, and are not described herein again.

In particular, OTUk (k ═ 3, 4) signals are caused to carry out transmission problems on the existing 100GE and 40GE multi-channel optical modules, especially when 4 and 20 communication channels are used; it also enables the transmission of two OTUk (k 3, 4) high-speed signals over the existing 10GWDM system, especially for 4, 10, 16 communication channels.

Corresponding to the method for transmitting data to the multi-path communication channel of the embodiment of the invention, the embodiment of the invention provides a method for receiving data from the multi-path communication channel to receive the data transmitted by the method for transmitting data to the multi-path communication channel.

The data receiving method comprises the following steps: and receiving data consisting of the data blocks, and recovering the data according to the data blocks of the data, which contain the frame positioning information of the data frame.

In the embodiment of the present invention, the frame positioning information specifically includes: FAS field information, or, FAS and MFAS field information. In the embodiment of the present invention, the data recovery method includes the following steps:

and firstly, data recovery is carried out according to the absolute corresponding relation between the MFAS value and the channel number of the multi-channel communication channel of the sending end.

For example, fig. 19 is a flowchart illustrating a method of receiving data from a multicast communication channel according to a tenth embodiment of the present invention. Referring to fig. 19, the method includes the steps of:

in step S1901, data composed of data blocks is received.

In step S1902, a data block containing FAS and MFAS is captured.

Step S1903, performs frame synchronization according to the FAS field, and determines the boundary of the original data frame and the boundary of the data block.

Step S1904, obtain the absolute channel number of each communication channel of the receiving end according to the absolute correspondence between the MFAS field value and the channel number of the communication channel of the transmitting end.

In the embodiment, if the MFAS value and the source-side channel number have an absolute correspondence, for a communication channel capturing a certain MFAS value, the correspondence of the communication channel with respect to the source-side channel number can be directly obtained by MOD (MFAS, M), and the identification method is very simple.

Step S1905, determining the order relationship and boundary information of the data block on the multiple communication channels according to the absolute channel number of the multiple communication channels, and recovering the data.

And secondly, acquiring the relative channel number of the multi-channel communication channel of the receiving end according to the relationship that the acquired MFAS field value is consistent with the serial number of the channel with the MFAS field value in the multi-channel communication channel, namely determining the sequence relationship of the data block on the multi-channel communication channel, thereby recovering the data.

And thirdly, determining the relative channel number of the multi-channel communication channel according to the sequence of the FAS field appearing on each channel of communication channel of the receiving end, thereby determining the sequence relation of the data block on the multi-channel communication channel and further performing data recovery.

It should be noted that the data recovery process of this embodiment is described in detail in the device 2 for receiving data from the multipath communication channel according to this embodiment of the present invention, and is not described herein again.

Fig. 20 is a flowchart illustrating a method for transmitting data through multiple communication channels according to an eleventh embodiment of the present invention. Referring to fig. 20, the method includes the steps of:

step S2001, the transmitting end splits each data frame of the data into an integer number of data blocks according to the split granularity. The split granularity is not less than the number of bytes of the frame location indication field FAS.

Step S2002, the sending end regularly distributes data blocks of the data to the multiple communication channels, so that the data blocks containing the frame positioning information of the data frames among the data blocks regularly appear on the multiple communication channels;

step S2003, sending a data block of data through a multi-path communication channel;

step S2004, the receiving end receives data composed of data blocks, and recovers the data according to the data block of the data, which includes the frame positioning information of the data frame.

The frame positioning information specifically includes: FAS field information, or, FAS and MFAS field information. In the embodiment of the present invention, a sending end splits and regularly distributes data to multiple communication channels for sending, which may be referred to in the description of the method for sending data to the multiple communication channels in the embodiment of the present invention; the original data is recovered after the receiving end receives the data block of the data, which can be referred to the description of the method for receiving the data from the multipath communication channel in the embodiment of the invention.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. A method for transmitting data to a plurality of communication channels, said data comprising a plurality of optical transmission unit data frames, comprising:

according to the splitting granularity, uniformly splitting each data frame of the data into an integral number of data blocks, wherein the splitting granularity is not less than the byte number of a frame positioning indication field FAS;

regularly distributing the data blocks of the data to the multi-channel communication channel so that the data blocks containing the frame positioning information of the data frames in the data blocks of the data regularly appear on the multi-channel communication channel;

and transmitting the data block of the data through the multi-channel communication channel.

2. The method according to claim 1, wherein said regularly distributing the data blocks of the data to the multiple communication channels comprises: regularly distributing the data blocks of the data onto the multiple communication channels according to inverse multiplexing recovery requirements; the inverse multiplexing recovery requirement is specifically as follows:

taking the number of the channels of the multi-channel communication channel as a period, and distributing a data block containing frame positioning information of a data frame on each multi-channel communication channel in the period; or,

and taking the minimum natural number which is larger than the number of the channels of the multi-channel communication channel and can divide the period value of the MFAS into whole numbers as a period, wherein the data blocks containing the frame positioning information of the data frames are distributed on the multi-channel communication channels in the period.

3. The method of claim 2, said regularly distributing the data blocks of the data onto the multiple communication channels according to inverse multiplex recovery requirements, comprising:

according to the sequence of the data blocks in the data, the data blocks are distributed to the multiple communication channels in sequence;

judging whether the data blocks distributed to the multi-path communication channel meet the inverse multiplexing recovery requirement, if not, adjusting the position of the data blocks on the multi-path communication channel according to the inverse multiplexing recovery requirement; if so, no adjustment is performed.

4. The method according to claim 3, wherein said adjusting the position of the data block on the multiple communication channels according to the inverse multiplexing recovery requirement is specifically:

determining a channel hop span cycle value according to a channel hop span and the number of channels of the multi-channel communication channel, wherein the channel hop span is the number of residual data blocks after data blocks of a data frame are uniformly distributed to the multi-channel communication channel;

and taking the channel hop span cycle value as an adjusting unit, and adjusting the position of the data block in the channel hop span cycle value on the multi-channel communication channel according to the inverse multiplexing recovery requirement.

5. The method of claim 1, wherein before the step of splitting the data frame of the data into an integer number of data blocks according to the splitting granularity, the method further comprises:

exchanging positions of words containing frame positioning information of the data frame and other words of the data frame in the data frame of the data according to the splitting granularity and the inverse multiplexing recovery requirement, wherein the number of bytes of the words containing the frame positioning information of the data frame and the other words is equal to the splitting granularity;

the inverse multiplexing recovery requirement is specifically as follows:

taking the number of the channels of the multi-channel communication channel as a period, and distributing a word containing the frame positioning information of the data frame on each of the multi-channel communication channels in the period; or,

and taking the minimum natural number which is larger than the number of channels of the multi-channel communication channel and can divide the period value of the MFAS into whole as a period, wherein the words containing the frame positioning information of the data frames are distributed on the multi-channel communication channel in the period.

6. The method according to claim 5, wherein the exchanging, according to the split granularity and the inverse multiplexing recovery requirement, the position of the word of the frame positioning information of the data frame included in the data frame of the data with other words of the data frame includes:

determining a channel hop span cycle value according to the split granularity and the channel number of the multi-channel communication channel;

and exchanging the position of the word containing the frame positioning information of the data frame in the data frame with other words of the data frame according to the inverse multiplexing requirement for the data frame in the channel hopping span cycle value by taking the channel hopping span cycle value as an adjusting unit.

7. An apparatus for transmitting data to a plurality of communication channels, comprising:

and the distribution module is used for sequentially distributing the split data blocks to the multi-path communication channel according to the sequence of the data blocks in the data, so that the data blocks containing the frame positioning information of the data frames in the data blocks regularly appear on the multi-path communication channel, and sending the data blocks through the multi-path communication channel.

8. The apparatus according to claim 7, further comprising a first adjusting module, configured to swap a word containing frame alignment information of a data frame with other words of the data frame in the data frame of the data according to the splitting granularity and the inverse multiplexing recovery requirement, where the number of bytes of the word containing frame alignment information of the data frame and the other words is equal to the splitting granularity, and transmit the adjusted data to the splitting module.

9. The apparatus for transmitting data according to claim 8, wherein the first adjusting module comprises:

the first adjustment control module is used for judging whether the requirement of inverse multiplexing recovery is met or not according to the splitting granularity and the channel number of the multi-channel communication channel;

and the first adjustment processing module is used for exchanging positions of the words containing the frame positioning information of the data frame and other words of the data frame in the data frame of the data according to the splitting granularity and the inverse multiplexing recovery requirement when the judgment result is yes, transmitting the adjusted data to the splitting module, and directly transmitting the data to the splitting module when the judgment result is no.

10. The apparatus of claim 8 or 9, wherein the means for transmitting data further comprises: the storage module is used for storing the inverse multiplexing recovery requirement; the inverse multiplexing recovery requirement is specifically as follows:

11. An apparatus for transmitting data to a plurality of communication channels, comprising:

and the second adjusting module is used for adjusting the position of the data block on the multi-path communication channel according to the inverse multiplexing recovery requirement so as to enable the data block containing the frame positioning information of the data frame in the data block to regularly appear on the multi-path communication channel, and transmitting the adjusted data block through the multi-path communication channel.

12. The apparatus for transmitting data according to claim 11, wherein the apparatus further comprises a second adjusting module, the second adjusting module comprising:

the second adjustment control module is used for judging whether the data blocks distributed to the multi-channel communication channel by the distribution module meet the inverse multiplexing recovery requirement or not;

and the second adjustment processing module is used for adjusting the position of the data block on the multi-channel communication channel according to the inverse multiplexing recovery requirement when the data block is judged not to be satisfied, transmitting the adjusted data block through the multi-channel communication channel, and directly transmitting the data block through the multi-channel communication channel without executing adjustment when the data block is judged to be satisfied.

13. The apparatus for transmitting data according to claim 11 or 12, wherein the apparatus further comprises: the storage module is used for storing the inverse multiplexing recovery requirement; the inverse multiplexing recovery requirement is specifically as follows:

14. A method of receiving data from a multiplex communication channel, receiving data transmitted by the method of transmitting data of claim 1, characterized in that:

and receiving the data composed of the data blocks, and recovering the data according to the data blocks of the data, which contain the frame positioning information of the data frame.

15. The method according to claim 14, wherein the frame positioning information of the data frame contained in the data block is specifically:

a frame alignment indication (FAS) field; or

A frame-location indication FAS field and a multiframe-location indication MFAS field.

16. The method of receiving data according to claim 15, wherein the method comprises:

determining the order relation of the data blocks of the data on a multi-channel communication channel of a receiving end according to the frame positioning information in the data blocks containing the frame positioning information of the data frames, and recovering the data; the method for determining the order relationship of the data blocks on the multi-path communication channel of the receiving end comprises one of the following steps:

if the maximum differential transmission delay compensated by the receiving end is less than 1/2 of the transmission time of the data frame, capturing the sequence of FAS fields appearing on the multi-path communication channel of the receiving end, acquiring the relative channel number of the multi-path communication channel, and determining the sequence relation of the data blocks on the multi-path communication channel;

capturing an MFAS field, acquiring an absolute channel number of a multi-channel communication channel of a receiving end according to the absolute corresponding relation between the value of the MFAS field and the channel number of the multi-channel communication channel of the transmitting end, and determining the sequence relation of the data block on the multi-channel communication channel; or,

capturing an MFAS field, acquiring the relative channel number of a multi-channel communication channel of a receiving end according to the consistent increasing relationship between the value of the MFAS field and the channel number of the communication channel in which the MFAS field appears, and determining the order relationship of the data block on the multi-channel communication channel.

17. An apparatus for receiving data from a multiplex communication channel, for receiving data transmitted by the apparatus for transmitting data of claim 7, said apparatus comprising:

18. The apparatus for receiving data according to claim 17, wherein the data recovery module comprises:

a capturing module, configured to capture a frame alignment indication field FAS of the frame alignment information, or a frame alignment indication field FAS and a multi-frame alignment indication MFAS field of the frame alignment information, and determine a channel number of a multi-channel communication channel in the device receiving the data according to the FAS field or the MFAS field;

and the combination recovery module is used for carrying out data combination according to the channel number of the multi-channel communication channel determined by the capture module.

19. The apparatus for receiving data according to claim 17, wherein the data recovery module comprises:

a communication channel sequence rearrangement module, configured to rearrange the multiple communication channels according to the channel numbers of the multiple communication channels determined by the capture module;

and the combination recovery module is also used for acquiring the data blocks from the rearranged multi-channel communication channels and carrying out data combination.

20. The apparatus for receiving data according to claim 18 or 19, wherein the capturing module further comprises:

and the relative channel number arbitration module is used for arbitrating the channel numbers of the multi-channel communication channels according to the sequence of the FAS fields appearing on the multi-channel communication channels or the relationship that the value of the MFAS field is consistent with and increased with the channel numbers of the communication channels where the MFAS field appears.

21. The apparatus for receiving data according to claim 18 or 19, wherein when the data is adjusted, the data recovery module further comprises:

and the adjusting and restoring module is used for adjusting and restoring the data block of the data before or after the inverse multiplexing data combination module works.

22. A system for communicating data over multiple communication channels, the system comprising:

apparatus for transmitting data to a multi-path communication channel as claimed in claim 7 or 11 and apparatus for receiving data from a multi-path communication channel as claimed in claim 17.

23. A method for transmitting data over a multiple communication channel, the data comprising a plurality of optical transmission unit data frames, the method comprising:

a sending end uniformly splits each data frame of the data into an integer number of data blocks according to a splitting granularity, wherein the splitting granularity is not less than the byte number of a frame positioning indication field FAS;

the sending end regularly distributes the data blocks of the data to a multi-channel communication channel so that the data blocks containing the frame positioning information of the data frames in the data blocks of the data regularly appear on the multi-channel communication channel; and transmitting the data block through the multi-path communication channel.

And the receiving end receives the data consisting of the data blocks and recovers the data according to the data blocks of the data, which contain the frame positioning information of the data frames.

24. The method according to claim 23, wherein the frame positioning information of the data frames contained in the data block is specifically:

a frame alignment indication field FAS; or

A frame positioning indication field FAS and a multiframe positioning indication field MFAS.