CN114430574A - Service mapping encapsulation method, device and computer readable storage medium - Google Patents
Service mapping encapsulation method, device and computer readable storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0893—Assignment of logical groups to network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
Abstract
The embodiment of the invention provides a service mapping encapsulation method, a device and a computer readable storage medium, wherein the method comprises the following steps: the sending end slices the data stream of each type of service; allocating a user identification CID to each obtained slice; packaging the marked N slices, and mapping the packaged N slices into a wavelength converter OTU 0; and N is an integer less than or equal to 256.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a service mapping encapsulation method, an apparatus, and a computer-readable storage medium.
Background
In a metropolitan area network environment, to implement access to a customer service, an operator may deploy a user side device at a user side, such as: CPE OTN equipment. Currently, the CPE OTN uplink interface is 2.5G OTU1, and the client signal accessed at the client side may be a GE (1.25G), or an FE (100M), or an STM-4(622M), or an STM-1(155M), or even several E1(2M), which results in very little actual traffic encapsulated into the 2.5G OTU1 IrDI interface. And a 2.5G OTU1 interface is connected to the metro OTN network, the metro OTN network will open up a 2.5G channel, even if the actual traffic flow in the channel is only hundreds of M, tens of M, or even several M, and the channel is encapsulated in a 2.5G channel for transmission, which will result in the waste of metro OTN network bandwidth resources.
In order to realize efficient bearer of small-particle services, a novel IrDI (inter-domain interconnection) interface-OTU 0 may be adopted, and an OTU0 IrDI interface with a rate of about 1G is adopted to encapsulate a plurality of or a plurality of service signals in a VC container of SDH, and then further encapsulate the service signals in an OTU 0. However, as the specifications of SDH VC containers are VC4(STM-1, 155M), VC4-4C (STM-4,622M), VC4-16C (STM-16, 2.5G), VC4-64C (STM-64, 10G) and VC containers which are not matched with OTU01.32G rate, the maximum loading of one VC4-4C (622M) in the OTU0 is caused, and only half of the capacity is utilized.
Disclosure of Invention
In view of this, embodiments of the present invention are intended to provide a service mapping encapsulation method, apparatus, and computer-readable storage medium.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a service mapping encapsulation method, which is applied to a sending end and comprises the following steps:
slicing the data flow of each type of service;
allocating a user identification CID to each obtained slice;
packaging the marked N slices, and mapping the packaged N slices into a wavelength converter OTU 0; and N is an integer less than or equal to 256.
Wherein, the slicing the data stream of each type of service includes:
slicing the fixed bit rate CBR data stream of each type of service, wherein each slice is a packet message; wherein the average length of each slice is Byte bytes, or Byte +1, or Byte-1 bytes.
And the packet message carries user identification CID information, and the value range of a user identification CID field is 0-255.
Wherein the frequency of occurrence of a slice with an average length of Byte +1 or Byte-1 bytes directly reflects the frequency deviation of the CBR clock and the system reference clock; the higher the frequency of occurrence, the greater the frequency deviation of the two clocks.
Therein, the transmission clock of the wavelength converter ODU0 and the system reference clock are phase locked.
Wherein, allocating a user identification CID to each obtained slice includes:
each slice is identified with the user identification CID field of the generic framing procedure GFP-C extension header of the CBR.
Wherein, the encapsulating the N identified slices and then mapping the N identified slices into the wavelength converter OTU0 includes:
and performing GFP-C encapsulation on the N slices identified by the user identification CID field, converging multiple GFP-C services into a single GFP-C service flow, mapping the single GFP-C service flow into an optical channel data unit ODU0, and then mapping the single GFP-C service flow into an OTU 0.
The embodiment of the invention also provides a service mapping and packaging method, which is applied to a receiving end and comprises the following steps:
recovering a data stream consisting of N slices from the wavelength converter OTU 0;
identifying and obtaining each slice based on the user identification CID;
and recombining the obtained slices and recovering the data stream of the corresponding service.
Wherein, the recovering from the wavelength converter OTU0 to obtain the data stream composed of N slices includes:
recovering from the OTU0 to obtain an optical channel data unit ODU;
and recovering the ODU0 to obtain a GFP-C service flow consisting of N slices, and recovering a system reference clock of an opposite end from the ODU 0.
Wherein the identifying each slice based on the user identification CID comprises:
identifying and distinguishing each slice from the GFP-C service flow based on a user identification CID;
and obtaining the frequency offset of the CBR clock relative to the reference clock of the opposite-end system based on the frequency of the received slice with the average length of Byte +/-1 Byte.
The reconstructing the obtained slice to recover the data stream of the corresponding service includes:
and reconstructing the CBR clock and the data stream of the corresponding service based on the frequency offset of the CBR clock relative to the reference clock of the opposite-end system and the reference clock information of the end system.
The embodiment of the invention also provides a service mapping encapsulation device, which is applied to a sending end and comprises the following components:
the slicing module is used for slicing the data stream of each type of service;
a configuration module, configured to allocate a user identification CID to each obtained slice;
the processing module is used for packaging the marked N slices and mapping the N slices into the wavelength converter OTU 0; and N is an integer less than or equal to 256.
The embodiment of the invention also provides a service mapping and packaging device, which is applied to a receiving end and comprises the following components:
the recovery module is used for recovering a data stream consisting of N slices from the wavelength converter OTU 0;
the identification module is used for identifying and obtaining each slice based on the user identification CID;
and the recombination module is used for recombining the obtained slices and recovering the data stream of the corresponding service.
The embodiment of the invention also provides a service mapping and packaging device, which comprises: a processor and a memory for storing a computer program capable of running on the processor,
wherein the processor is configured to perform the steps of the above method when running the computer program.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the above-mentioned method.
According to the service mapping encapsulation method, the service mapping encapsulation device and the computer-readable storage medium provided by the embodiment of the invention, the sending end slices the data stream of each type of service; allocating a user identification CID to each obtained slice; packaging the marked N slices, and mapping the packaged N slices into a wavelength converter OTU 0; and N is an integer less than or equal to 256. The embodiment of the invention can simultaneously transmit the multi-path services in a single ODU0 channel, only one 622M can be used at most from the prior art, and the multi-path services can be expanded to 1087M at most, so that the multi-service high-efficiency access and the independent transmission can be realized, the full utilization of OTU0 channel resources can be realized, and the encapsulation efficiency of ODU0 can be improved.
In addition, the embodiment of the invention also supports the clock transparent transmission of each path of service, and can ensure the independence of the clock frequency of each type of service by processing the slice synchronization information.
Drawings
Fig. 1 is a first schematic flow chart of a service mapping and packaging method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a service mapping and packaging method according to an embodiment of the present invention;
fig. 3 is a first schematic structural diagram of a service mapping encapsulation apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a service mapping encapsulation apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a service mapping encapsulation channel according to a scenario embodiment of the present invention;
fig. 6 is a schematic diagram of a format of a GFP-C packet according to the scene embodiment of the present invention.
Detailed Description
The invention is described below with reference to the figures and examples.
An embodiment of the present invention provides a service mapping and encapsulating method, as shown in fig. 1, where the method is applied to a sending end, and includes:
step 101: slicing the data flow of each type of service;
step 102: allocating a user identification CID to each obtained slice;
step 103: packaging the marked N slices, and mapping the packaged N slices into a wavelength converter OTU 0; and N is an integer less than or equal to 256.
The embodiment of the invention can simultaneously transmit multi-path services in a single ODU0 channel, can realize high-efficiency access and independent transmission of the multi-services, realizes full utilization of OTU0 channel resources, and improves the encapsulation efficiency of the ODU 0.
In the embodiment of the present invention, the slicing the data stream of each type of service includes:
slicing the fixed bit rate CBR data stream of each type of service, wherein each slice is a packet message; wherein the average length of each slice is Byte bytes, or Byte +1, or Byte-1 bytes.
In the embodiment of the invention, the packet message carries user identification CID information, and the value range of a user identification CID field is 0-255.
In the embodiment of the invention, the frequency of the slice with the average length of Byte +1 or Byte-1 directly reflects the frequency deviation of the CBR clock and the system reference clock; the higher the frequency of occurrence, the greater the frequency deviation of the two clocks.
In the embodiment of the present invention, the transmission clock of the wavelength converter ODU0 and the system reference clock are phase-locked.
In the embodiment of the present invention, allocating a user identifier CID to each obtained slice includes:
each slice is identified with the user identification CID field of the generic framing procedure GFP-C extension header of the CBR.
In the embodiment of the present invention, the encapsulating the N identified slices and then mapping the N identified slices into the wavelength converter OTU0 includes:
and performing GFP-C encapsulation on the N slices identified by the user identification CID field, converging multiple GFP-C services into a single GFP-C service flow, mapping the single GFP-C service flow into an optical channel data unit ODU0, and then mapping the single GFP-C service flow into an OTU 0.
An embodiment of the present invention further provides a service mapping and encapsulating method, as shown in fig. 2, where the method is applied to a receiving end, and includes:
step 201: recovering a data stream consisting of N slices from the wavelength converter OTU 0;
step 202: identifying and obtaining each slice based on the user identification CID;
step 203: and recombining the obtained slices and recovering the data stream of the corresponding service.
In this embodiment of the present invention, the recovering from the wavelength converter OTU0 to obtain the data stream composed of N slices includes:
recovering from the OTU0 to obtain an optical channel data unit ODU;
and recovering the ODU0 to obtain a GFP-C service flow consisting of N slices, and recovering a system reference clock of an opposite end from the ODU 0.
In this embodiment of the present invention, the identifying and obtaining each slice based on the user identifier CID includes:
identifying and distinguishing each slice from the GFP-C service flow based on a user identification CID;
and obtaining the frequency offset of the CBR clock relative to the reference clock of the opposite-end system based on the frequency of the received slice with the average length of Byte +/-1 Byte.
In the embodiment of the present invention, the reconstructing the obtained slice to recover the data stream of the corresponding service includes:
and reconstructing the CBR clock and the data stream of the corresponding service based on the frequency offset of the CBR clock relative to the reference clock of the opposite-end system and the reference clock information of the end system.
In order to implement the foregoing method embodiment, an embodiment of the present invention further provides a service mapping encapsulation apparatus, and as shown in fig. 3, the apparatus is applied to a sending end, and includes:
a slicing module 301, configured to slice a data stream of each type of service;
a configuration module 302, configured to allocate a user identification CID to each obtained slice;
the processing module 303 is configured to encapsulate the identified N slices, and then map the encapsulated N slices into the wavelength converter OTU 0; and N is an integer less than or equal to 256.
In this embodiment of the present invention, the slicing module 301 slices the data stream of each type of service, including:
slicing the fixed bit rate CBR data stream of each type of service, wherein each slice is a packet message; wherein the average length of each slice is Byte bytes, or Byte +1, or Byte-1 bytes.
In the embodiment of the invention, the packet message carries user identification CID information, and the value range of a user identification CID field is 0-255.
In the embodiment of the invention, the frequency of the slice with the average length of Byte +1 or Byte-1 directly reflects the frequency deviation of the CBR clock and the system reference clock; the higher the frequency of occurrence, the greater the frequency deviation of the two clocks.
In the embodiment of the present invention, the transmission clock of the wavelength converter ODU0 and the system reference clock are phase-locked.
In this embodiment of the present invention, the allocating module 302 allocates a user identifier CID to each obtained slice, including:
each slice is identified with the user identification CID field of the generic framing procedure GFP-C extension header of the CBR.
In this embodiment of the present invention, the processing module 303 encapsulates the identified N slices, and then maps the N slices into the wavelength converter OTU0, including:
and performing GFP-C encapsulation on the N slices identified by the user identification CID field, converging multiple GFP-C services into a single GFP-C service flow, mapping the single GFP-C service flow into an optical channel data unit ODU0, and then mapping the single GFP-C service flow into an OTU 0.
An embodiment of the present invention further provides a service mapping encapsulation apparatus, as shown in fig. 4, where the apparatus is applied to a receiving end, and includes:
a restoring module 401, configured to restore a data stream composed of N slices from the wavelength converter OTU 0;
an identifying module 402, configured to identify each slice based on a user identifier CID;
a restructuring module 403, configured to restructure the obtained slice, and recover a data stream of a corresponding service.
In this embodiment of the present invention, the restoring module 401 recovers from the wavelength converter OTU0 to obtain a data stream composed of N slices, including:
recovering from the OTU0 to obtain an optical channel data unit ODU;
and recovering the ODU0 to obtain a GFP-C service flow consisting of N slices, and recovering a system reference clock of an opposite end from the ODU 0.
In this embodiment of the present invention, the identifying module 402 identifies each slice based on a user identifier CID, including:
identifying and distinguishing each slice from the GFP-C service flow based on a user identification CID;
and obtaining the frequency offset of the CBR clock relative to the reference clock of the opposite-end system based on the frequency of the received slice with the average length of Byte +/-1 Byte.
In this embodiment of the present invention, the recombining module 403 recombines the obtained slice to recover the data stream of the corresponding service, including:
and reconstructing the CBR clock and the data stream of the corresponding service based on the frequency offset of the CBR clock relative to the reference clock of the opposite-end system and the reference clock information of the end system.
The embodiment of the invention also provides a service mapping and packaging device, which comprises: a processor and a memory for storing a computer program capable of running on the processor,
wherein the processor is configured to execute, when running the computer program:
slicing the data flow of each type of service;
allocating a user identification CID to each obtained slice;
packaging the marked N slices, and mapping the packaged N slices into a wavelength converter OTU 0; and N is an integer less than or equal to 256.
Wherein, the slicing the data stream of each type of service includes:
slicing the fixed bit rate CBR data stream of each type of service, wherein each slice is a packet message; wherein the average length of each slice is Byte bytes, or Byte +1, or Byte-1 bytes.
And the packet message carries user identification CID information, and the value range of a user identification CID field is 0-255.
Wherein the frequency of occurrence of a slice with an average length of Byte +1 or Byte-1 bytes directly reflects the frequency deviation of the CBR clock and the system reference clock; the higher the frequency of occurrence, the greater the frequency deviation of the two clocks.
Therein, the transmission clock of the wavelength converter ODU0 and the system reference clock are phase locked.
When a user identification CID is assigned to each slice obtained, the processor is further configured to, when running the computer program, perform:
each slice is identified with the user identification CID field of the generic framing procedure GFP-C extension header of the CBR.
When the N identified slices are encapsulated and then mapped into the wavelength converter OTU0, the processor is further configured to execute, when running the computer program:
and performing GFP-C encapsulation on the N slices identified by the user identification CID field, converging multiple GFP-C services into a single GFP-C service flow, mapping the single GFP-C service flow into an optical channel data unit ODU0, and then mapping the single GFP-C service flow into an OTU 0.
The embodiment of the invention also provides a service mapping and packaging device, which comprises: a processor and a memory for storing a computer program capable of running on the processor,
wherein the processor is configured to execute, when running the computer program:
recovering a data stream consisting of N slices from the wavelength converter OTU 0;
identifying and obtaining each slice based on the user identification CID;
and recombining the obtained slices and recovering the data stream of the corresponding service.
When the data stream composed of N slices is recovered from the wavelength converter OTU0, the processor is further configured to execute, when running the computer program:
recovering from the OTU0 to obtain an optical channel data unit ODU;
and recovering the ODU0 to obtain a GFP-C service flow consisting of N slices, and recovering a system reference clock of an opposite end from the ODU 0.
The processor is further configured to, when the user identification CID is identified to obtain each slice, execute:
identifying and distinguishing each slice from the GFP-C service flow based on a user identification CID;
and obtaining the frequency offset of the CBR clock relative to the reference clock of the opposite-end system based on the frequency of the received slice with the average length of Byte +/-1 Byte.
When the obtained slice is recombined and the data stream of the corresponding service is recovered, the processor is further configured to execute, when the computer program is run, the following steps:
and reconstructing the CBR clock and the data stream of the corresponding service based on the frequency offset of the CBR clock relative to the reference clock of the opposite-end system and the reference clock information of the end system.
It should be noted that: in the apparatus provided in the foregoing embodiment, when performing service mapping encapsulation, only the division of each program module is described as an example, and in practical applications, the processing allocation may be completed by different program modules according to needs, that is, the internal structure of the device is divided into different program modules, so as to complete all or part of the processing described above. In addition, the apparatus provided in the above embodiments and the corresponding method embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments and are not described herein again.
In an exemplary embodiment, the embodiment of the present invention also provides a computer-readable storage medium, which may be a Memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface Memory, optical disc, or CD-ROM; or may be a variety of devices including one or any combination of the above memories, such as a mobile phone, computer, tablet device, personal digital assistant, etc.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs:
slicing the data flow of each type of service;
allocating a user identification CID to each obtained slice;
packaging the marked N slices, and mapping the packaged N slices into a wavelength converter OTU 0; and N is an integer less than or equal to 256.
Wherein, the slicing the data stream of each type of service includes:
slicing the fixed bit rate CBR data stream of each type of service, wherein each slice is a packet message; wherein the average length of each slice is Byte bytes, or Byte +1, or Byte-1 bytes.
And the packet message carries user identification CID information, and the value range of a user identification CID field is 0-255.
Wherein the frequency of occurrence of a slice with an average length of Byte +1 or Byte-1 bytes directly reflects the frequency deviation of the CBR clock and the system reference clock; the higher the frequency of occurrence, the greater the frequency deviation of the two clocks.
Therein, the transmission clock of the wavelength converter ODU0 and the system reference clock are phase locked.
When a user identification CID is assigned to each of the obtained slices, the computer program, when executed by the processor, further performs:
each slice is identified with the user identification CID field of the generic framing procedure GFP-C extension header of the CBR.
When the N identified slices are encapsulated and then mapped into the wavelength converter OTU0, when the computer program is executed by the processor, the computer program further executes:
and performing GFP-C encapsulation on the N slices identified by the user identification CID field, converging multiple GFP-C services into a single GFP-C service flow, mapping the single GFP-C service flow into an optical channel data unit ODU0, and then mapping the single GFP-C service flow into an OTU 0.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs:
recovering a data stream consisting of N slices from the wavelength converter OTU 0;
identifying and obtaining each slice based on the user identification CID;
and recombining the obtained slices and recovering the data stream of the corresponding service.
When the data stream composed of N slices is recovered from the wavelength converter OTU0, the computer program, when executed by the processor, further performs:
recovering from the OTU0 to obtain an optical channel data unit ODU;
and recovering the ODU0 to obtain a GFP-C service flow consisting of N slices, and recovering a system reference clock of an opposite end from the ODU 0.
When each slice is identified based on the user identification CID, the computer program, when executed by the processor, further performs:
identifying and distinguishing each slice from the GFP-C service flow based on a user identification CID;
and obtaining the frequency offset of the CBR clock relative to the reference clock of the opposite-end system based on the frequency of the received slice with the average length of Byte +/-1 Byte.
When the obtained slice is recombined and the data stream of the corresponding service is recovered, the computer program is executed by the processor, and further executes:
and reconstructing the CBR clock and the data stream of the corresponding service based on the frequency offset of the CBR clock relative to the reference clock of the opposite-end system and the reference clock information of the end system.
The invention is described below in conjunction with the scenario embodiments.
The embodiment provides a method for service mapping encapsulation, which maps multiple services to an ODU0(OTU0) as much as possible, and fully utilizes channel resources of the OTU 0. Meanwhile, the embodiment provides a GFP-C mapping protocol, which realizes efficient access of multiple services and independent transmission of each other. GFP-C (Generic frame Procedure for CBR) can simultaneously transport multiple small-particle fixed bit rate (CBR) services within a single ODU0 channel and support clock-through for each service. Small particle CBR services include FE, GE, STM-1 and STM-4.
In an OTN network, the implementation of GFP-C functionality includes the encapsulation and decapsulation processes of the traffic. In the encapsulation process, a GFP-C process is performed on a service access side board card of the device, to encapsulate a small-particle service to an ODU0 (a service cross particle in the OTN technology), and then the small-particle service enters a line side for transmission, and after reaching an opposite end node, GFP-C decapsulation is completed on a corresponding service side board card, as shown in fig. 5, the implementation steps are as follows:
the method comprises the following steps: at a service board card of equipment at a sending end, for E1, STM-1 and STM-4 belonging to CBR services, and FE and GE services, the service board card of the equipment firstly slices a CBR data stream, and each slice is a packet message (GFP-C message);
step two: using CID field of GFP-C extension head to identify each packet message to make GFP-C encapsulation (at most 256 ones can be encapsulated), making multi-path GFP-C service be converged into single GFP-C service flow, mapping it into ODU0, then mapping it into OTU 0;
step three: the receiving terminal recovers the ODU0 from the OTU0, then recovers the ODU0 into GFP-C service flow, distinguishes each packet message in the GFP-C service flow by using CID identification, and can recover the packet message from the GFP-C service flow;
step four: and the equipment outlet recombines the packet messages, restores to obtain the original CBR data stream, and restores the clock of the CBR through a clock restoration algorithm.
The format of the GFP-C packet is shown in fig. 6, and the interworking requirement of the corresponding field is shown in table 1 below:
| field(s) | Inter working requirement |
| EXI | Set to 0001, indicate Linear Frame |
| PFI | Set to 1, indicate to carry payload FCS |
| CID | 255, indicating the Client ID (number of small particles characterized) |
| Payload | Raw data of customer |
TABLE 1
In order to implement the clock transparent transmission capability for the service signal, in fig. 5, the service board card of the node a also simultaneously performs the following functions:
first, the CBR data stream is sliced with an average slice length of B (bytes), which may occasionally be B +1 or B-1.
Secondly, the frequency (frequency) of the slice with the average length of B +/-1 directly reflects the frequency deviation of the CBR clock and the system reference clock, and the higher the frequency is, the larger the frequency deviation is; and vice versa.
Third, the transmission clock of the ODU0 must be phase locked to the system reference clock.
The service board card of the node B performs the following functions:
firstly, a system reference clock of an opposite terminal is recovered from the received ODU 0.
And secondly, recovering the packet message from the GFP-C service flow, and calculating the frequency offset of the CBR clock relative to the reference clock of the opposite-end system according to the frequency of the received slice with the length of B +/-1.
And thirdly, reconstructing a CBR clock and a data stream according to the frequency offset information and the reference clock information of the opposite-end system.
It should be noted that the node B can communicate with a plurality of different nodes a simultaneously, and each node a and node B can operate in different clock domains.
As can be seen from table 3 below, through the above service processing in this embodiment, for each service, the service encapsulation manner of sequence number 2, sequence number 5, sequence number 7, sequence number 9, and sequence number 10 can be additionally implemented in this embodiment, compared with the encapsulation manner in table 2. Multiple services can be mapped into one ODU0 at the same time, and the maximum bandwidth utilization can be 1087M, which is much higher than 622M in table 2.
Table 2 existing service encapsulation method
Table 3 service encapsulation method of the present invention
Therefore, the embodiment of the invention can simultaneously transmit multiple services in a single ODU0 channel, and only one 622M can be used at most from the past, and the embodiment can be expanded to at most 1087M, so that efficient access and mutually independent transmission of multiple services can be realized, the full utilization of OTU0 channel resources is realized, and the encapsulation efficiency of the ODU0 is improved.
In addition, the embodiment of the invention also supports the clock transparent transmission of each path of service, and can ensure the independence of the clock frequency of each type of service by processing the slice synchronization information.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (15)
1. A service mapping encapsulation method is characterized in that the method is applied to a sending end and comprises the following steps:
slicing the data flow of each type of service;
allocating a user identification CID to each obtained slice;
packaging the marked N slices, and mapping the packaged N slices into a wavelength converter OTU 0; and N is an integer less than or equal to 256.
2. The method of claim 1, wherein the slicing the data streams of each type of service comprises:
slicing the fixed bit rate CBR data stream of each type of service, wherein each slice is a packet message; wherein the average length of each slice is Byte bytes, or Byte +1, or Byte-1 bytes.
3. The method according to claim 2, wherein the packet message carries user identification CID information, and a value range of a user identification CID field is 0 to 255.
4. The method of claim 2, wherein the frequency of occurrence of a slice with an average length of Byte +1 or Byte-1 bytes directly reflects the frequency deviation of the CBR clock and the system reference clock; the higher the frequency of occurrence, the greater the frequency deviation of the two clocks.
5. Method according to claim 1, characterized by the phase locking of the transmission clock of the wavelength converter ODU0 and the system reference clock.
6. The method of claim 1, wherein assigning a user identification (CID) to each of the obtained slices comprises:
each slice is identified with the user identification CID field of the generic framing procedure GFP-C extension header of the CBR.
7. The method according to claim 1, wherein the encapsulating and re-mapping the identified N slices into the wavelength converter OTU0 comprises:
and performing GFP-C encapsulation on the N slices identified by the user identification CID field, converging multiple GFP-C services into a single GFP-C service flow, mapping the single GFP-C service flow into an optical channel data unit ODU0, and then mapping the single GFP-C service flow into an OTU 0.
8. A service mapping encapsulation method is characterized in that the method is applied to a receiving end and comprises the following steps:
recovering a data stream consisting of N slices from the wavelength converter OTU 0;
identifying and obtaining each slice based on the user identification CID;
and recombining the obtained slices and recovering the data stream of the corresponding service.
9. The method according to claim 8, wherein said recovering a data stream consisting of N slices from a wavelength converter OTU0 comprises:
recovering from the OTU0 to obtain an optical channel data unit ODU;
and recovering the ODU0 to obtain a GFP-C service flow consisting of N slices, and recovering a system reference clock of an opposite end from the ODU 0.
10. The method of claim 9, wherein the identifying each slice based on a user identification (CID) comprises:
identifying and distinguishing each slice from the GFP-C service flow based on a user identification CID;
and obtaining the frequency offset of the CBR clock relative to the reference clock of the opposite-end system based on the frequency of the received slice with the average length of Byte +/-1 Byte.
11. The method according to claim 10, wherein the reconstructing the obtained slice to recover the data stream of the corresponding service comprises:
and reconstructing the CBR clock and the data stream of the corresponding service based on the frequency offset of the CBR clock relative to the reference clock of the opposite-end system and the reference clock information of the end system.
12. A service mapping encapsulation device is characterized in that the device is applied to a sending end and comprises:
the slicing module is used for slicing the data stream of each type of service;
a configuration module, configured to allocate a user identification CID to each obtained slice;
the processing module is used for packaging the marked N slices and mapping the N slices into the wavelength converter OTU 0; and N is an integer less than or equal to 256.
13. A service mapping encapsulation device is characterized in that the device is applied to a receiving end and comprises:
the recovery module is used for recovering a data stream consisting of N slices from the wavelength converter OTU 0;
the identification module is used for identifying and obtaining each slice based on the user identification CID;
and the recombination module is used for recombining the obtained slices and recovering the data stream of the corresponding service.
14. A service mapping encapsulation apparatus, comprising: a processor and a memory for storing a computer program capable of running on the processor,
wherein the processor is adapted to perform the steps of the method of any one of claims 1 to 7 or to perform the steps of the method of any one of claims 8 to 11 when running the computer program.
15. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7 or carries out the steps of the method of any one of claims 8 to 11.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115361342A (en) * | 2022-10-21 | 2022-11-18 | 中国信息通信研究院 | Method and equipment for configuring small particle channel of power CBR (communication based radio) service |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115361342A (en) * | 2022-10-21 | 2022-11-18 | 中国信息通信研究院 | Method and equipment for configuring small particle channel of power CBR (communication based radio) service |
| CN115361342B (en) * | 2022-10-21 | 2023-03-10 | 中国信息通信研究院 | Method and equipment for configuring small particle channel of power CBR (communication based radio) service |
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