WO2011029247A1 - Encoding/decoding method and apparatus - Google Patents

Abstract

A transmitting method and apparatus for mapping 8B/10B encoding signal to an optical transport network (OTN) are disclosed, which are to solve the problems of the complexity and low efficiency of mapping process when 8B/10B encoding signals are mapped to an OTN in the prior art. The method comprises: determining the optical payload unit OPUk of 8B/10B encoding signals accessed by a bearer according to the rate of 8B/10B encoding signals and that of the different levels of the OPUk in the OTN; transforming the 8B/10B encoding signals into certain encoding signals according to the rates of 8B/10B encoding signals and the OPUk; and mapping the certain encoding signals to the OPUk for transportion, wherein, the certain encoding signals are composed of encoding blocks with regulated length, each encoding block includes bit synchronization frame header information, and the rate of the certain encoding signal is not higher than that of the OPUk.

Description

 Method and device for encoding/decoding

Technical field

 The present invention relates to the field of optical transport network (OTN) technologies, and in particular, to a method and apparatus for encoding/decoding.

Background technique

 With the development of communication systems, OTN has gradually become the mainstream technology in the field of optical communication, especially the development of cross-scheduling technology based on OTN, which has gradually developed OTN into a multi-service bearer platform.

 The service signal characteristics of various access OTNs are different. However, the OTN payload rate is fixed, and this makes the mapping paths and methods different when different service signals are mapped to the OTN payload.

 The OTN payload is also called optical payload unit k ( OPUk ).

(k=0, 1 , 2, 2e, 3 , 4 ) , k denotes different rate levels. The OPU type and rate corresponding to the OPUk are shown in Table 1:

 Table 1

When the service signal rate is slightly higher than the OPUk rate, if the direct mapping mode is used, it can only be mapped to the OPUk of the higher rate class, causing a serious waste of bandwidth. For example, the Gigabit Ethernet GE service signal is encoded with 8B/10B, and the line rate is 1.25 Gbps. If the 8B/10B coded stream is directly mapped into the OPUk, the OPU0 cannot be loaded into the OPU0 because the rate is 1.23895431 Gbps. If it is mapped to OPU1, and because the OPU1 rate is 2.48832 Gbps, which is much larger than 1.25 Gbps, it causes a serious waste of bandwidth. The current solution is to de-encode the 8B/10B encoded data service signal that is connected to the OTN, and then use the general framing procedure for the decoded code stream according to the ITU-T G.7041 standard (Generic Framing) Procedure, GFP) performs GFP packet to reduce the rate of the service signal. Finally, according to the provisions of G.709, the GFP data is inserted by inserting a GFP idle frame or by an Asynchronous Generic Mapping Procedure (AGMP). The frame is mapped into OPUk.

 It can be seen that this mapping method is complicated, especially if the GFP packet needs to be first mapped and then mapped, which will seriously affect the mapping efficiency and increase the design cost. Summary of the invention

 The invention provides a method and a device for mapping an 8B/10B coded signal to an optical transport network for solving the problem that the mapping process is complicated and the efficiency is not high when the 8B/10B coded signal is mapped to the optical transport network in the prior art. .

 The present invention provides a method of mapping an 8B/10B encoded signal to an optical transport network transmission, which includes:

 Determining an OPUk carrying the 8B/10B coded signal according to the rate of the 8B/10B coded signal and the rate of the optical payload unit OPUk in the OTN;

 Converting the 8B/10B encoded signal into a specific encoded signal according to a rate of the 8B/10B encoded signal and a rate of the OPUk, wherein the specific encoded signal is composed of coded blocks of a set length, each encoding The block includes bit synchronization frame header information, and the rate of the particular encoded signal is not higher than the rate of the OPUk;

 Mapping the particular encoded signal to the OPUk for transmission.

 Furthermore, in the above method, the step of converting the 8B/10B encoded signal into a specific encoded signal comprises:

 Decoding the 8B/10B coded signal to obtain a decoded service code code stream, where each service code is 8 bits;

Each N service codes in the decoded service code stream is formed into one coding block, each coding block performs self-synchronization scrambling, and a bit synchronization frame header of a set number of bits is inserted before each scrambled code block. , Forming a corresponding fixed length of a specific coding block, wherein, according to the speed of the accessed 8B/10B coded signal

 A specific coded block of each fixed length is composed of a specific coded signal.

 In addition, in the foregoing method, the rate of the decoded service code code stream is obtained according to the rate of the accessed 8B/10B coded signal and the OPUk according to the rate of the accessed 8B/10B coded signal.

K , where = x ;

1 ¹ 10

Determining a range of values of the N according to a rate of the decoded service code stream, a rate of the OPUk, and a set number of bits M of the bit synchronization frame header, where, according to τ, Nx8 + M τ, 8 Nx8 + M ^ _T , _τ , MV

K x = Vx— x < V _k , sure enough Ν ≥ and

¹ Nx8 10 Nx8 ^k \0V, - W In the range of values of N determined, a positive integer greater than or equal to 2 is selected as the N

In addition, in the foregoing method, the step of mapping the specific coded signal to the OPUk for transmission includes:

 The asynchronous mapping procedure AMP, or the bit synchronization mapping procedure BMP, or the asynchronous universal mapping procedure AGMP, defined according to the ITU-T G.709 standard, maps the specific encoded signal to the OPUk for transmission.

 The present invention provides a transmitting device for use in an optical transport network OTN, the transmitting device comprising:

 a determining unit, configured to determine an OPUk carrying the accessed 8B/10B encoded signal according to a rate of the 8B/10B encoded signal and a rate of different levels of the optical payload unit OPUk in the OTN;

 a coding unit configured to convert the 8B/10B encoded signal into a specific encoded signal according to a rate of the 8B/10B encoded signal and a rate of the OPUk, wherein the specific encoded signal is of a set length Composed of coding blocks, each coding block containing bit synchronization frame header information, and the rate of the specific coded signal is not higher than the rate of the OPUk;

A mapping unit arranged to map the particular encoded signal to the OPUk for transmission. In addition, in the above apparatus, the coding unit includes:

 a decoding subunit, configured to decode the 8B/10B encoded signal to obtain a decoded service code code stream, where each service code is 8 bits;

 Inserting a subunit, which is configured to form a coding block for each N service codes in the decoded service code stream, and each coding block performs self-synchronization scrambling, and inserts a setting before each scrambled code block. a bit-synchronized frame header of a number of bits, forming a corresponding fixed-length specific coding block, wherein the value of the N is determined according to the number of accesses;

 A subunit is formed which is arranged to compose a specific coded block of each fixed length into a specific coded signal. In addition, in the above device, the inserting subunit is further configured to:

 Obtaining the rate of the decoded service code stream according to the rate of the accessed 8B/10B coded signal

K , where = x , and

1 ¹ 10

 Determining the value range of the N according to the rate of the decoded service code code stream, the rate of the OPUk, and the set number of bits M of the bit synchronization frame header, where

In the determined

In the range of values, a positive integer greater than or equal to 2 is selected as the value of the N.

 In addition, in the foregoing apparatus, the mapping unit is further configured to:

 The specific mapping signal is mapped to the OPUk according to the asynchronous mapping procedure AMP defined by the ITU-T G.709 standard, or the bit synchronization mapping procedure BMP, or the asynchronous universal mapping procedure AGMP.

 The present invention provides a method of de-mapping an optical transport network OTN encoded signal to an 8B/10B encoded signal, comprising:

 Demapping the received OTN coded signal to obtain a specific coded signal, wherein the specific coded signal is composed of coded blocks of a set length, each coded block includes bit synchronization frame header information, and the specific coded signal is The rate is not higher than the rate of the OPUk carrying the specific coded signal; decoding the obtained specific coded signal to obtain a service code stream;

 The obtained service code stream is subjected to 8B/10B encoding to obtain an 8B/10B coded signal.

In addition, in the above method, the obtained specific coded signal is decoded to obtain a service code. The steps of the code stream include:

 Searching for bit synchronization frame header information in the received specific coded signal;

 And obtaining, according to the searched bit synchronization frame header information, a service code code stream included in the received specific coded signal. The present invention provides a receiving device for use in an optical transport network OTN, the receiving device comprising:

 a demapping unit, configured to demap the received OTN coded signal to obtain a specific coded signal, where the specific coded signal is composed of coded blocks of a set length, and each coded block includes bit synchronization frame header information, And the rate of the specific encoded signal is not higher than a rate of OPUk carrying the specific encoded signal;

 a decoding unit configured to decode the obtained specific encoded signal to obtain a service code stream;

 And a coding unit configured to perform 8B/10B coding on the obtained service code code stream to obtain an 8B/10B coded signal.

 In addition, in the foregoing apparatus, the decoding unit includes:

 Searching for a subunit, configured to search for bit synchronization header information in the received specific encoded signal;

 Obtaining a subunit, configured to obtain a service code code stream included in the received specific coded signal according to the searched bit synchronization frame header information.

 The 8B/10B coded signal provided by the present invention is mapped to the optical transmission network transmission process, according to

The rate of the 8B/10B coded signal, and the rate of the different levels of the optical payload unit OPUk in the OTN, determine the OPUk of the 8B/10B coded signal that carries the access. The 8B/10B encoded signal is converted to a specific encoded signal based on the rate of the 8B/10B encoded signal and the rate of the OPUk. Mapping the particular encoded signal to the OPUk for transmission. The specific coded signal is composed of coded blocks of a set length, each code block includes bit synchronization frame header information, and the rate of the specific coded signal is not higher than a rate of OPUk carrying the specific coded signal. It can be seen that only converting the 8B/10B coded signal into a specific coded signal can effectively reduce the signal rate, and the OTN transmission using the reduced rate signal can improve the transmission efficiency and save the network bandwidth. Simultaneously, Since the process of GFP packet is avoided, the mapping process is simplified, and the design cost of the transmission device can be effectively reduced.

BRIEF abstract

 1 is a flowchart of a transmission process of mapping an 8B/10B encoded signal to an OTN transmission according to an embodiment of the present invention;

 2 is a structural diagram of a transmitting apparatus for mapping an 8B/10B encoded signal to an OTN transmission according to an embodiment of the present invention;

 3 is a flowchart of receiving processing for mapping an 8B/10B encoded signal to an OTN transmission according to an embodiment of the present invention;

 4 is a structural diagram of a receiving apparatus for mapping an 8B/10B encoded signal to an OTN transmission according to an embodiment of the present invention;

 5 is a flow chart showing a transmission process of converting an 8B/10B encoded signal into a 64B/66B encoded signal into an OTN transmission in the first embodiment of the present invention;

 Figure 6 is a flow chart showing the reception processing of converting an 8B/10B encoded signal into a 64B/66B encoded signal into an OTN transmission in the first embodiment of the present invention. Preferred embodiment of the invention

 In the embodiment of the present invention, the service signal for accessing the OTN has been encoded by 8B/10B, that is, the service signal for accessing the OTN is an 8B/10B coded signal. Referring to FIG. 1, the 8B/10B coded signal is mapped to the OTN. The transmission processing of the transmission includes:

 Step 101: Determine an OPUk carrying the 8B/10B coded signal that is accessed.

 In OTN, the rate of each level of OPUk is fixed. For details, see Table 1. When the rate of the 8B/10B coded signal is 0, find the rate of OPUk slightly lower than that in Table 1. The OPUk carries the accessed 8B/10B encoded signal.

For example, the rate of the 8B/10B coded signal is 1.25 Gbps. In Table 1, the rate of OPUk which is slightly lower than V is OPU0, which is 1. 238 954 310 Gbps, and the 8B/ of the OPU0 bearer access is determined. 10B encoded signal. Step 102: Convert the accessed 8B/10B coded signal into a specific coded signal according to the rate of the accessed 8B/10B coded signal and the determined rate of the OPUk.

 The rate of OPUk carrying the accessed 8B/10B coded signal is slightly lower than the rate of the accessed 8B/10B coded signal. Therefore, the 8B/10B coded signal cannot be directly mapped into the OPUk, and the 8B/10B coded signal must be converted into The specific coded signal, the rate of which must be less than or equal to the rate of OPUk.

 Here, the received 8B/10B coded signal is first decoded to obtain a decoded service code code stream, that is, a 10-bit continuous service code code stream is decoded into an 8-bit continuous service code code stream, where the service code is data. Code or control code, each service code includes 8 bits.

 Then, each N service code in the decoded service code stream is composed into one coding block, and each coding block includes Nx 8 bits, and each Nx8-bit coding block is synchronously scrambled, after each scrambling code. A bit synchronization frame header of a set number of bits M is added before the coding block, so that each specific coding block is formed, wherein the length of each specific coding block is fixed to NX8 + M bits, and M is greater than or equal to 2. Where N is determined by the rate of the accessed 8B/10B coded signal, the rate of OPUk, and the set number of bits M of the bit sync frame header.

 Finally, a specific coded signal is composed of each specific coded block.

 Step 103: Map the specific encoded signal to the OPUk for transmission.

 The coded converted specific coded signal is mapped to the OPUk for transmission. Here, the specific coded signal stream is mapped to the OPUk, and the Asynchronous Mapping Procedure (AMP) or the bit synchronization mapping procedure defined by the ITU-T G.709 standard can be used. (Bitsynchronous Mapping Procedure, BMP) or Asynchronous Generic Mapping Procedure (AGMP)

Step 102, N is, The OPUk rate V _k and the bit synchronization header is set to M bits determined by the rate 8B / 10B coded signal access, comprises:

First, according to the rate of the 8B/10B coded signal that is accessed, the rate of the decoded service code stream is obtained by referring to formula (1).

Then according to the rate of the decoded service code stream, the rate of OPUk, and the bit synchronization frame Set the number of bits M of the head, determine the range of values of the N, see formula (2):

_T , Nx8 + M _τ , 8 Nx8 + M ^ _T , , , 1 Nx8 10 Nx8 ^k

Thus, the value of N ranges from N ≥ ^MV .

\0V _k - W Finally, in the range of values of the determined N, a value of N greater than or equal to 2 is selected. According to the above method, a transmitting device can be constructed. Referring to FIG. 2, the method includes: a determining unit 100, a coding unit 200, and a mapping unit 300.

 The determining unit 100 is configured to determine, according to the rate of the 8B/10B coded signal and the rate of the optical payload unit OPUk in the OTN, the OPUk carrying the accessed 8B/10B coded signal.

 The encoding unit 200 is configured to convert the 8B/10B encoded signal into a specific encoded signal according to a rate of the 8B/10B encoded signal and a rate of the OPUk, where the specific encoded signal is encoded by a set length Block composition, each code block includes bit synchronization frame header information, and the rate of the specific coded signal is not higher than the rate of the OPUk.

 The mapping unit 300 is configured to map the specific encoded signal to the OPUk for transmission. The encoding unit 200 further includes: a decoding subunit 210, an insertion subunit 220, and a constituent subunit 230, such that

 The decoding subunit 210 is configured to decode the 8B/10B encoded signal to obtain a decoded service code stream, where each service code is 8 bits.

 The insertion sub-unit 220 is configured to form a coding block for each N service codes in the decoded service code stream, and each coding block performs self-synchronization scrambling, and inserts a setting before each scrambled code block. a bit-synchronized frame header of a number of bits, forming a corresponding fixed-length specific coding block, wherein, according to a rate of the accessed 8B/10B coded signal, a rate of the OPUk, and a set number of bits of the bit synchronization frame header The value of N.

 The component subunit 230 is configured to form a specific coded block of each fixed length into a specific coded signal. Moreover, the insertion sub-unit 220 is further configured to first obtain a rate of the decoded service code code stream according to the rate of the accessed 8B/10B coded signal, where = x^, and then according to the rate of the decoded service code code stream ^ The rate of the OPUk and the number of bits of the bit synchronization frame header

M, determining a range of values of the N, wherein, according to x ^{Nx8 +} M = _xx ^{Nx 8 +} M _≤

¹ Nx8 10 Nx8 ^k You can determine ?^≥ ^mv , and finally, in the range of values of the determined Ν, choose a value greater than or equal to 10V _k - 8V

 A positive integer of 2 is the value of the N.

That is, N is a positive integer greater than or equal to ^M , and any one of them can be selected within this range.

10V _k - 8V

A positive integer greater than or equal to 2 is a value of N, and the bandwidth of the OPUk can also be utilized to the utmost, and a value of a positive integer greater than or equal to 2 is preferably selected again.

 The mapping unit is further used to map the specific coded signal to the OPUk.

 The foregoing embodiment describes a transmission process for mapping an 8B/10B coded signal to an OTN transmission. The embodiment of the present invention further provides a process for receiving an 8B/10B coded signal into an OTN transmission. Referring to FIG. 3, the method includes:

 Step 301: Demap the received OTN coded signal to obtain a specific coded signal. Here, the specific coded signal, that is, the specific coded stream, can be recovered from the OTN coded signal according to the information provided by the OPUk overhead. The encoded signal is composed of coded blocks of a set length, each coded block containing bit sync frame header information, and the rate of the particular coded signal is not higher than the rate of OPUk carrying the particular coded signal.

Here, the length of the coding block in the decoded specific coded signal is Nx8 + M bits, and each coding block includes an M-bit bit synchronization frame header, and the rate of the specific coded signal is χ ^{Νχ 8 + Μ} ,

 10 Nx8 is not higher than the rate of OPUk carrying the specific coded signal. Step 302: Decode the obtained specific coded signal to obtain a service code code stream.

 Here, first, the bit synchronization frame header information in the specific coded signal is searched.

 The received specific coded signal is composed of a fixed length of a specific code block, each of which includes an M-bit bit sync frame header and an Nx 8-bit service code, and the service code is a data code or a control code. Therefore, in the received specific coded signal, the bit sync frame header information is searched.

Then, according to the searched bit synchronization frame header information, the service code code stream included in the received specific coded signal is obtained. That is, according to the searched bit synchronization frame header information, the boundary of the service code included in each specific coding block can be known, thereby obtaining the service code code stream in the specific coded signal. Step 303: Perform 8B/10B encoding on the obtained service code stream to obtain an 8B/10B coded signal. According to the above method, a receiving apparatus is constructed. Referring to FIG. 4, the method includes: a demapping unit 410, a decoding unit 420, and an encoding unit 430, where:

 The demapping unit 410 is configured to perform demapping on the received OTN coded signal to obtain a specific coded signal, where the specific coded signal is composed of coded blocks of a set length, and each coded block includes bit synchronization frame header information, And the rate of the particular encoded signal is not higher than the rate of OPUk carrying the particular encoded signal.

 The decoding unit 420 is configured to decode the obtained specific encoded signal to obtain a service code stream. The coding unit 430 performs 8B/10B coding on the obtained service code stream to obtain an 8B/10B coded signal.

 The demapping unit 410 may recover a specific encoded signal, that is, a specific encoded code stream, from the OTN encoded signal according to the information provided by the OPUk overhead.

 In this way, the decoding unit 420 first searches for the bit synchronization frame header information in the received specific coded signal, and then, according to the searched bit synchronization frame header information, can learn the boundary of the service code included in each specific coding block, thereby obtaining A stream of traffic codes in a particular encoded signal.

 The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

 Embodiment 1: The 8B/10B coded signal in the Gigabit Ethernet GE with a rate of 1.25 Gbps is mapped to the OTN for transmission, and in this embodiment, the set bit number of the bit synchronization frame header is 2, that is, the formula (2) ), M=2. See Figure 5:

 Step 501: Determine an OPUk of an 8B/10B coded signal carrying a rate of 1.25 Gbps.

 The rate of OPU0 is 1.2389543 lGbps, which is slightly lower than 1.25 Gbps. Therefore, the OPUk carrying the coded signal is OPU0.

 Step 502: Determine, according to the rate of the accessed 8B/10B coded signal, the rate of the OPUk, and the set number of bits of the bit synchronization frame header, the number of service codes constituting the coded block, that is, the value of N in the formula (2).

Here, V = 1.25Gbps, V _k = 1.23895431Gbps, Μ = 2, therefore, according to

Ν > ^MV = 1.046, we can see that Ν is a positive integer greater than or equal to 2.

10 _t -8 The format of the 64B/66B coding block is as shown in Table 2. There is a 2-bit bit synchronization frame header before every 8 bytes. When the bit synchronization frame header is 01, it means that the next 8 bytes are all data codes. When the bit sync frame header is 10, it indicates a control code of at least 1 byte of the following 8 bytes. At this time, the first byte immediately adjacent to the bit sync frame header indicates a block type field (Block Type Field) indicating the type of the 66 block code block. It can be seen that the length and format of the 64 Β/66 Β code block are fixed, which facilitates byte synchronization in the receiving direction. Therefore, the 1.25 Gbps 8B/10B coded signal can be converted into a 64B/66B coded signal. , that is, you can make N=8

 Step 503: Decode the accessed 8B/10B coded signal to obtain a service code code stream, where each service code includes 8 bits, and the service code is a data code or a control code.

 The data code or control code in the 8B/10B coded signal is randomly generated. Therefore, the data code or control code in the decoded service code stream is consistent with the 8B/10B coded signal.

 Step 504: Combine every 8 service codes into a 64-bit code block to perform self-synchronization scrambling. Step 505: Insert a 2-bit bit synchronization frame header in front of each scrambled code block to form an encoded code stream composed of 66-bit code blocks.

 Table 2

 S

 According to the coding standard, in the 66B code block, the frame start character /S/ can only appear in the 0th or 4th byte, and the coded block type fields are 0x78 and 0x33, respectively. However, for GE services, the frame start character /S/, the possible location is all even bytes, ie 0, 2, 4, 6 bytes. When /S/ appears in the 2nd or 6th byte, in the 66B encoding block, two additional custom characters are required to represent it. See Table 3, which is a definition method. The code block type field is 0x36, the /S/ appears in the 2nd byte, and the code type field is 0x63, and /S/ appears in the 6th byte.

 Data code format coding block

C ₀ C ₁ S ₂ D3D ₄ D ₅ D ₆ D-

 table 3

 In the coding blocks of Tables 2 and 3 above, D represents a data character, and C represents a control character. Each control character occupies 7 bits, and the correspondence between the 8B/10B coded control code and the control character code in the 66B block is as shown in Table 4.

保留 5 0xf7 0x78 K23.7 信号序列集 /Fsig/ 0x5c 码类型域编码 +0码 OxF K28.2 表 4

Reserved 5 0xf7 0x78 K23.7 Signal Sequence Set / Fsig / 0x5c Code Type Domain Code + 0 Code OxF K28.2 Table 4

 Thus, for the GE service, when the 8B/10B coding error is detected before step 503, it is not necessary to decode it, and the control character / E/(Oxl e ) is directly substituted in the 64B/66B code. This makes it easy to implement fault transparent transmission of GE services.

 Step 506: Map the coded stream composed of 66-bit coded blocks into OPU0 for transmission.

 The code stream rate after 64B/66B encoding, that is, the code code flow rate composed of 66-bit code blocks is 1.25X x = 1.03125 < 1.238954, which is less than the rate of OPUO, therefore, 64B/66B

 10 64

The encoded code stream rate is mapped into OPU0.

 The code stream rate after the 64B/66B encoding is lower than the rate of the OPU0. Therefore, when mapping to the OPU0, a certain padding byte needs to be added to the OPU0 according to the proportional relationship between the two rates, and the identifier is set in the overhead area of the OPU0. .

 Because the 64B/66B code block is not an integer byte, when the OPU0 is loaded, the 64B/66B code block needs to be added to the OPU0 byte to be added with information data in groups of 8 bits.

 In the above process, the 8B/10B coded signal in the Gigabit Ethernet GE with a rate of 1.25 Gbps is mapped to the OPU0 for transmission. Then, when the signal in the OPU0 is sent to the client device, the demapping process needs to be performed, as shown in FIG. 6. , including:

 Step 601: According to the information provided by the OPU0 overhead, the padding byte in the OPU0 is removed, and the 64B/66B coded stream is recovered.

 Step 602: Perform 64B/66B decoding on the recovered 64B/66B coded stream.

 Here, the bit synchronization frame header in the 64B/66B coded stream can be found first according to the synchronous detection state machine specified by the IEEE802.3 standard, thereby recovering the byte boundary.

 Then, according to the mapping relationship described in Table 2-4, the 64B/66B coded block payload data is converted into a service code format, that is, a format of the data code plus control code.

When coding conversion, it is necessary to pay attention to the conversion to GE when encountering the error indication code. The corresponding error code indicates the character.

 Step 603: Extract the 64B/66B decoded data, and after performing 8B/10B encoding, restore the GE service line code and send it to the client device.

 In the above embodiment, the 8B/10B coded signal is converted into a 64B/66B coded signal. Of course, the 8B/10B code may be converted into a 512B/515B coded signal, or the 8B/10B code may be converted into a 1024B/1027B coded signal. and many more.

 In summary, in the embodiment of the present invention, the OPUk of the 8B/10B coded signal that is accessed is determined according to the rate of the 8B/10B coded signal and the rate of the optical payload unit OPUk in the OTN. The 8B/10B encoded signal is converted to a specific encoded signal based on the rate of the 8B/10B encoded signal and the rate of the OPUk. Mapping the particular encoded signal to the OPUk for transmission. It can be seen that only converting the 8B/10B coded signal into a specific coded signal can effectively reduce the signal rate, and using the reduced rate signal for OTN transmission can improve the transmission efficiency and save network bandwidth. At the same time, since the process of GFP packet is avoided, the mapping process is simplified, and the design cost of the transmission device can be effectively reduced.

 It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and variations of the invention as claimed.

Industrial Applicability In the present invention, the OPUk of the 8B/10B coded signal to be accessed is determined according to the rate of the 8B/10B coded signal and the rate of the different levels of the optical payload unit OPUk in the OTN. The 8B/10B encoded signal is converted to a specific encoded signal based on the rate of the 8B/10B encoded signal and the rate of the OPUk. Mapping the particular encoded signal to the OPUk for transmission. It can be seen that only by converting the 8B/10B coded signal into a specific coded signal, the signal rate can be effectively reduced, and the OTN transmission using the reduced rate signal can improve the transmission efficiency and save the network bandwidth. At the same time, since the process of GFP packet is avoided, the mapping process is simplified, and the design cost of the transmission device can be effectively reduced.

Claims

Claim  A method for mapping an 8B/10B coded signal to an optical transport network OTN transmission, comprising: determining a bearer connection according to a rate of the 8B/10B coded signal and a rate of different levels of the optical payload unit OPUk in the OTN The OPUk of the 8B/10B encoded signal;  Converting the 8B/10B encoded signal into a specific encoded signal according to a rate of the 8B/10B encoded signal and a rate of the OPUk, wherein the specific encoded signal is composed of coded blocks of a set length, each encoding The block includes bit synchronization frame header information, and the rate of the particular encoded signal is not higher than the rate of the OPUk;  Mapping the particular encoded signal to the OPUk for transmission.  2. The method of claim 1 wherein the step of converting the 8B/10B encoded signal to a particular encoded signal comprises:  Decoding the 8B/10B coded signal to obtain a decoded service code code stream, where each service code is 8 bits;  And each N service codes in the decoded service code stream is formed into one coding block, and each coding block performs self-synchronization scrambling, and inserts a bit synchronization of a set number of bits before each scrambled code block. a frame header, forming a corresponding fixed length of a specific coding block, wherein the 8B/10B coding according to the access The value of N;  A specific coded block of each fixed length is composed of a specific coded signal.  3. The method of claim 2, wherein the step of encoding the signal value according to the accessed 8B/10B comprises:  Obtaining a rate K of the decoded service code stream according to the rate of the accessed 8B/10B coded signal, where

 Determining the value range of the N according to the rate of the decoded service code code stream, the rate of the OPUk, and the set number of bits M of the bit synchronization frame header, where „ Νχ8 + Μ τ, 8 Nx8 + M ^ _T . _τ , MV  x = V — x < , sure enough Ν ≥ and ¹ Nx8 10 Nx8 ^k \0V, - W In the determined range of values of the N, a positive integer greater than or equal to 2 is selected as the value of the N.  4. The method of claim 1, wherein the step of mapping the specific encoded signal to the OPUk for transmission comprises:  Asynchronous mapping procedure AMP, or bit synchronization mapping procedure as defined by the ITU-T G.709 standard BMP, or asynchronous universal mapping procedure AGMP, mapping the specific encoded signal to the OPUk for transmission.  5. A transmitting device, which is applied in an optical transport network OTN, the transmitting device comprising: a determining unit configured to set a rate according to an 8B/10B encoded signal, and a different level of the optical payload unit OPUk in the OTN Rate, determining an OPUk carrying the 8B/10B coded signal that is accessed;  a coding unit configured to convert the 8B/10B encoded signal into a specific encoded signal according to a rate of the 8B/10B encoded signal and a rate of the OPUk, wherein the specific encoded signal is of a set length Composed of coding blocks, each coding block containing bit synchronization frame header information, and the rate of the specific coded signal is not higher than the rate of the OPUk;  A mapping unit arranged to map the particular encoded signal to the OPUk for transmission. 6. The apparatus according to claim 5, wherein the encoding unit comprises:  a decoding subunit, configured to decode the 8B/10B encoded signal to obtain a decoded service code code stream, where each service code is 8 bits;  Inserting a subunit, which is configured to form a coding block for each N service codes in the decoded service code stream, and each coding block performs self-synchronization scrambling, and inserts a setting before each scrambled code block. a bit-synchronized frame header of a number of bits, forming a corresponding fixed-length specific coding block, wherein, according to a rate of the accessed 8B/10B coded signal, a rate of the OPUk, and a set number of bits of the bit synchronization frame header The value of N;  A subunit is formed which is arranged to compose a specific coded block of each fixed length into a specific coded signal. 7. The apparatus according to claim 6, wherein the insertion subunit is further configured to: obtain a rate of the decoded service code code stream according to a rate of the accessed 8B/10B coded signal. K , where = x , and 1 ¹ 10  Determining the value range of the N according to the rate of the decoded service code code stream, the rate of the OPUk, and the set number of bits M of the bit synchronization frame header, where According to ^^^ = ^<^<^^ _≤ N _≥ ^^, the determined 1 Nx8 10 Nx8 ^k \0V _k - W In the range of values of N, a positive integer greater than or equal to 2 is selected as the value of the N.  8. The apparatus according to claim 5, wherein the mapping unit is further configured to:  The specific mapping signal is mapped to the OPUk according to the asynchronous mapping procedure AMP defined by the ITU-T G.709 standard, or the bit synchronization mapping procedure BMP, or the asynchronous universal mapping procedure AGMP.  9. A method of demapping an optical transport network OTN coded signal to an 8B/10B coded signal, comprising:  Performing demapping on the received OTN coded signal to obtain a specific coded signal, where the specific coded signal is composed of coded blocks of a set length, each coded block includes bit synchronization frame header information, and the specific coded The rate of the signal is not higher than the rate of the OPUk carrying the particular encoded signal;  Decoding the obtained specific coded signal to obtain a service code stream;  The obtained service code stream is subjected to 8B/10B encoding to obtain the 8B/10B coded signal.  10. The method according to claim 9, wherein the step of decoding the obtained specific coded signal to obtain a service code code stream comprises:  Searching for bit synchronization frame header information in the received specific coded signal;  And obtaining, according to the searched bit synchronization frame header information, a service code code stream included in the received specific coded signal. A receiving device, which is applied in an optical transport network OTN, the receiving device comprising: a demapping unit configured to demap the received OTN encoded signal to obtain a specific encoded signal, wherein the specific The encoded signal is composed of coded blocks of a set length, each coded block containing bit synchronization frame header information, and the rate of the specific coded signal is not higher than the rate of OPUk carrying the specific coded signal; a decoding unit configured to decode the obtained specific encoded signal to obtain a service code stream; as well as  And a coding unit configured to perform 8B/10B coding on the obtained service code code stream to obtain the 8B/10B coded signal.  The device of claim 11, wherein the decoding unit comprises:  Searching for a subunit, configured to search for bit synchronization header information in the received specific encoded signal;  Obtaining a subunit, configured to obtain a service code code stream included in the received specific coded signal according to the searched bit synchronization frame header information.