CN101035112B - A device and method for transmitting additional information - Google Patents

Abstract

The invention discloses a device and a method for transmitting additional information. The device includes a GFP framing module, which is used to perform GFP encapsulation on the transmitted additional information by using the client management frame of the general framing procedure at the sending end and to perform GFP encapsulation on the receiving end. The received additional information frame encapsulated by the GFP is analyzed, and the additional information is recovered to realize the transmission of the additional information between communication devices. Utilizing the device and method of the present invention reduces the cost of using a dedicated channel, realizes flexibility, and has high encapsulation efficiency and robustness to data; GFP frames have fixed overhead, and flow management and QoS control are more convenient; GFP runs from different ports or chains Multiple protocols on the road share the same transmission channel, thereby increasing bandwidth utilization.

Description

A device and method for transmitting additional information

technical field

The invention relates to the field of communication, in particular to a device and method for transmitting additional information using GFP client management frames in a data 8B/10B business communication system in the field of communication.

Background technique

With the rapid development of the network, especially the rapid growth of today's data services, users' demand for bandwidth continues to increase, making the multi-service transmission platform (MSTP) technology one of the core technologies of next-generation transmission, and its development prospects are clear and optimistic It has been widely used by major mainstream telecom operators and is steadily advancing to the lower-level network. These devices usually support the GFP (Generic framing procedure) packaging technology of the service, and then map to the SDH virtual container VC, and finally perform OTN framing processing. However, in the current transmission system, monitoring information is usually transmitted by an out-of-band independent monitoring channel, or by in-band SDH or OTN frame overhead bytes. Using an independent monitoring channel requires additional channels and equipment, which increases network cost and complexity, and the transmission distance of the monitoring channel must match the transmission distance of the business, which brings great difficulty to the design of monitoring conduction. Using the method of frame overhead byte transmission of SDH or OTN, you must first find a byte that is not defined in the standard, and you cannot use it casually, which makes the selection of monitoring bytes very limited, and it is not easy to communicate with other devices. Secondly, this method must also add a dedicated circuit to insert and extract the content of the overhead byte. The framing needs to be implemented in an external circuit, which is very inflexible and expensive.

Usually the data 8B/10B business adopts GFP encapsulation processing, GFP frame is divided into control frame and customer frame, among them customer frame is divided into customer data frame and customer management frame, customer data frame is used to transmit customer service, such as GbE, SAN and other services , and the customer management frame is basically not used at present, so the customer management frame can be used to transmit additional information between communication devices, such as monitoring information.

GFP (Generic framing procedure, general framing procedure) provides a process for mapping high-level client signals to the transmission network. Its frame format is shown in Figure 1. Generally, a GFP frame is composed of a core header (Core Header) and a payload area (Payload Area), in which the core header has 4 bytes, including a 2-byte length byte and a 2-byte core header check byte (cHEC), the payload area is composed of the payload header (Payload Header), the payload (Payload) and the optional payload frame check (FCS), and the payload header includes the payload type (Payload Type) and type Head check (tHEC) and other parts.

The first byte (MSB) of Payload Type can be divided into payload type indicator (PTI), payload frame check indicator (PFI) and extension header indicator (EXI), and the second byte (LSB) is the client signal Indication (UPI). For detailed definitions, see the PTI content list in Table 1, Table 2 GFP client data frame user type list and Table 3 GFP client management frame user type. TypeBit<15:13> meaning 000 GFP client data frame 100 GFP client management frame

TypeBit<15:13> meaning other reserve

  0000 1101through1110 1111   保留   1111 0000through1111 1110   保留 Table 1 PTI content list

0000 1101 through 1110 1111 reserve 1111 0000 through 1111 1110 reserve

Table 2 GFP client data frame user type list

Table 3 GFP Client Management Frame User Type

Among them, the Chinese and English corresponding to the corresponding names in the frame structure in Figure 1 are as follows:

Core Header: core header

Payload Area: payload area

Payload Header: payload header

MSB: Most Significant Bit, the most significant bit

LSB: Least Significant Bit, the least significant bit

cHEC: Core HEC, core header check

eHEC: Extension HEC, extended header check

tHEC: Type HEC, type header check

CID: Channel ID, channel identification

EXI: Extension Header Identifier extension header indication

FCS: Frame-Check Sequence frame check sequence

GFP: Generic Framing Procedure, general framing procedure

HEC: Header Error Check, header check

PFI: Payload FCS Identifier, payload FCS indication

PTI: Payload Type Identifier, payload type indication

UPI: User Payload Identifier, User Payload Indication

Contents of the invention

The purpose of the present invention is to provide a device and method for transmitting additional information to solve the problems existing in the above-mentioned prior art, and use the service to transmit additional information along the road, reduce the cost of using a dedicated channel, and achieve flexibility, convenience and low cost .

In order to achieve the above-mentioned purpose of the present invention, the present invention provides a device for transmitting additional information, which includes a GFP framing module, which is used to carry out the additional information sent by using the client management frame of the general framing procedure at the sending end. GFP encapsulation and analyzing the received additional information frame encapsulated by GFP at the receiving end, recovering the additional information so as to transmit the additional information between communication devices.

The device, wherein, when performing GFP encapsulation on the additional information, the GFP framing module further sets the value of the payload type indication field of the GFP frame and/or the client signal indication field of the GFP frame to The additional information is GFP-encapsulated for reserved values.

The device, which further includes:

Additional information input channel;

An additional information input module, configured to input additional information to the GFP framing module through the additional information input channel; and/or,

Additional information output channel;

The additional information output module is configured to receive and analyze the additional information frame encapsulated by the GFP framing module from the additional information output channel, and restore the additional information.

In the device described above, the GFP framing module is further used to perform GFP encapsulation on the customer service data by using the customer data frame of the general framing procedure and analyze the GFP-encapsulated customer service data frame at the receiving end, The customer service data is recovered to transmit the customer service data.

The device, which further includes:

Business channel, used to access customer business;

The service interface is used to complete the access of customer services and complete the encoding and decoding of services.

The device further includes an encapsulation module in other forms, which is used to re-encapsulate the client data frame and the additional information frame encapsulated by GFP.

The device, wherein, at the receiving end, the GFP framing module is further used to identify the client data and / or additional information.

The device, wherein, the additional information input/output module is an MCU processor; and/or, the additional information input/output module realizes the interface of additional information with the outside through an Ethernet interface; and/or, The additional information input/output module is connected to the GFP framing module by a parallel bus or a serial bus.

The device, wherein the GFP framing module further includes:

The main processor interface is used to connect the additional information input and/or output module and the GFP framing module;

The customer management frame processing module is used to utilize the customer management frame to perform GFP framing processing on the additional information;

A customer data frame processing module, configured to use the customer data frame to perform GFP framing processing on the customer service data; and

The multiplexing and demultiplexing unit is configured to multiplex and/or demultiplex the GFP client management frame and/or client data frame.

Further, the present invention also provides a method for transmitting additional information, which includes:

Step A, the GFP framing module uses the client management frame of the general framing procedure to perform GFP encapsulation on the additional information sent; and

Step B, a step of analyzing the received additional information frame encapsulated by the GFP at the receiving end to restore the additional information.

The method, wherein, the step of GFP encapsulating the additional information by the GFP framing module further includes setting the value of the payload type indication field of the GFP frame and/or the value of the client signal indication field of the GFP frame to a reserved value step.

The method, wherein, before the step A, further includes the step of the additional information input module inputting additional information to the GFP framing module through the additional information input channel; and, after the step B, further includes the additional information output module from The additional information output channel receives the additional information frame encapsulated by the GFP, parses it, and restores the additional information.

The method, which further includes:

In step a, the GFP framing module uses the client data frame of the general framing procedure to perform GFP encapsulation on the sent client service data; and

Step b, a step of analyzing the received client service data frame encapsulated by GFP at the receiving end, and recovering the client service data.

The method further includes the step of re-encapsulating the GFP-encapsulated client data frame and additional information frame.

The method, wherein, further comprising, at the receiving end, the GFP framing module identifies the client data and additional information in the received GFP frame according to the value of the GFP frame payload type indication field and/or the value of the GFP frame client signal indication field information steps.

The method, wherein, the GFP framing module is further connected to the additional information input module and/or the additional information output module through a parallel bus or a serial bus.

The invention overcomes the shortcomings in the prior art and solves the problems in the prior art. Use the service to transmit additional information along the road to meet various needs, such as fault transparent transmission, monitoring information, etc. Reduce the cost of using a dedicated channel, achieve flexibility, high-efficiency and more robust data encapsulation; GFP frames have fixed overhead, and traffic management and QoS control are more convenient; GFP runs multiple protocols from different ports or links to share the same transmission channel, thereby increasing bandwidth utilization.

Description of drawings

FIG. 1 is a schematic diagram of a composition structure of a GFP frame structure in the prior art;

Fig. 2 is a schematic diagram of the principle of the system of the present invention;

Fig. 3 is a schematic structural diagram of the system of an embodiment of the present invention, showing the interface between the monitoring information and the GFP module;

Fig. 4 is a schematic structural diagram of a system according to another embodiment of the present invention, showing the interface between the monitoring information and the GFP module;

Fig. 5 is a schematic diagram of the internal implementation of the GFP module in an embodiment of the present invention;

FIG. 6 is a schematic diagram of a GFP frame format used to transmit monitoring information in an embodiment of the present invention;

Fig. 7 is a schematic diagram of a GFP frame format used to transmit monitoring information in another embodiment of the present invention.

Detailed ways

As shown in Fig. 2, the composition structure of the system of the present invention and the connection relationship between various parts are described. In Fig. 2, the system of the present invention includes: business channel 101, business interface module 102, GFP framing module 103, other packaging modules 104, line channel 105, monitoring information output module 106, monitoring information output channel 107, monitoring information input module 108. Monitoring information input channel 109. Among them, the function description of each part is as follows:

Service channel 101: an access channel for customer services.

Service interface module 102: used to complete the access of customer services, and complete the encoding and decoding of services.

GFP framing module 103: for performing GFP encapsulation processing on customer service data.

Other forms of encapsulation module 104: used to re-encapsulate the GFP frame, for example, encapsulate the SDH frame or the OTN frame.

Line channel 105: the line signal interface of the device.

Monitoring information output module 106: for receiving monitoring information from the monitoring information output channel, and analyzing the information.

Monitoring information output channel 107: a physical channel for outputting monitoring information.

Monitoring information input module 108: for framing the monitoring information and sending it to the monitoring information input channel.

Monitoring information input channel 109: a physical channel for monitoring information input.

When the client has data to send, it is sent to the service interface module 102 through the service channel 101 to complete the decoding of the client's data frame and restore it to the original data, and then send the data to the GFP framing module 103 for GFP packaging, adding core headers and core headers Check, set payload type PTI=000b (binary), set UPI (see table 2) according to customer service type simultaneously, represent that this frame is customer data frame, be encapsulated as a complete GFP frame at last; Simultaneously, monitoring information input module 108 modules can input monitoring information to GFP framing module 103 by monitoring information input channel 109, similarly, GFP framing module 103 adds core header and core header verification to monitoring data, and payload type PTI=100b or other reserved values are set , and set UPI to any reserved value at the same time, see Mark 1, Table 3, and finally encapsulate it into a complete GFP frame. Since the client data frame and monitoring information frame use different PTI types in the process of GFP packaging, so when receiving The terminal can distinguish whether the data in the GFP frame is client data or monitoring information according to the value of the PTI. Finally, the GFP frame is sent out on the line channel 105 after being processed by another form of encapsulation module 104 .

Similarly, when the data is received from the line channel 105 after being encapsulated by other forms of encapsulation module 104, it will be restored as a GFP frame, and these frames will be sent to the GFP framing module 103 for processing. The data frame is still monitoring information, if it is customer data, the data is sent to the service interface module 102 for processing, and the data is encoded by the service interface module 102 to form a frame format that meets customer requirements and then sent to the service channel 101; if the GFP framing module When 103 finds that the PTI and UPI of the frame indicate that the payload content is monitoring information, it sends the data to the monitoring information output module 106 through the monitoring information output channel 107 .

The following describes the steps of input and output of monitoring information according to the data flow direction.

Steps to enter monitoring information and customer data:

Step 1: the monitoring information input module 108 sends the monitoring information to the GFP framing module 103 through the monitoring information input channel 109;

Step 2: the GFP framing module 103 packs the data from the monitoring information input channel 109, sets PTI=100b or other reserved values, see Table 1, and sets UPI as any reserved value simultaneously, and proceeds to step 5;

Step 3: the service interface module 102 receives the data of the service channel 101, and sends the data to the GFP framing module 103 after decoding;

Step 4: GFP framing module 103 packs the data that service interface module 102 comes, and PTI=000b is set, see Table 1, and the value of UPI is set according to customer business type simultaneously, changes to step 5;

Step 5: the GFP framing module 103 sends the GFP frame that has been packaged to other forms of encapsulation modules 104;

Step 6: The encapsulation module 104 of other forms sends the data to the line channel 105 after encapsulating and scrambling the data sent by the GFP framing module 103 .

Output steps of monitoring information and customer data:

The process of demultiplexing is basically the opposite of the multiplexing process, as follows:

Step 11: the encapsulation module 104 of other forms receives the data of the line channel 105, and sends the GFP frame to the GFP framing module 103 after deframing and dewinding;

Step 12: GFP framing module 103 analyzes the GFP frame sent by other forms of encapsulation module 104, recognizes the type of PTI, and sends data to different branches according to the value of PTI, if PTI=000b, go to step 13. If PTI=100b or other reserved values and the UPI value is the expected value, go to step 15;

Step 13: GFP framing module 103 sends the data after GFP deframing to service interface module 102;

Step 14: the service interface module 102 processes the data sent by the GFP framing module 103, forms a frame format that meets customer requirements and outputs it to the service channel 101 after encoding;

Step 15: GFP framing module 103 sends the data after GFP deframing to monitoring information output module 106 through monitoring information output channel 107;

Step 16: The monitoring information output module 106 receives the customer management frame and recovers the monitoring information.

Fig. 3 is a schematic structural diagram of a system according to an embodiment of the present invention, showing the interface between the monitoring information and the GFP module. As shown in Figure 3, the input and output module of the monitoring information of an embodiment of the present invention is combined into one, adopts MCU microprocessor system 206 to realize, MCU realizes the interface of monitoring information with the outside through Fast Ethernet interface 208, MCU and GFP The parallel bus 207 is used between the framing modules 203, including: 8-bit wide data bus Dat[7..0], address bus Address, read/write control R/W, chip select signal CS and interrupt signal INT. It is also possible here not to use the MCU but to use other circuit arrangements instead. The functions of other modules in this embodiment, such as the service channel 201 , the service interface module 202 , the GFP framing module 203 , other forms of encapsulation modules 204 , and the line channel 205 , are the same as those of the corresponding modules in FIG. 2 .

Fig. 4 is a schematic structural diagram of a system according to another embodiment of the present invention, showing the interface between the monitoring information and the GFP module. As shown in Figure 4, the input and output module of monitoring information of another embodiment of the present invention is combined into one, adopts MCU microprocessor system 306 to realize, MCU realizes the interface of monitoring information with the outside through Fast Ethernet interface 308, MCU and A serial bus 307 is used between the GFP framing modules 303 , including: sending data TXD, sending clock TXCLK, receiving data RXD and receiving clock RXCLK. It is also possible here not to use the MCU but to use other circuit arrangements instead. The functions of other modules in this embodiment, such as the service channel 301 , the service interface module 302 , the GFP framing module 303 , and the encapsulation module 304 in other forms, are the same as those of the corresponding modules in FIG. 2 .

Fig. 5 is a schematic diagram of an internal implementation of the GFP module in an embodiment of the present invention. As shown in Figure 5, GFP framing module 403 further comprises: main processor interface (Host CPU IF) module 403a, client management frame processing module 403b, client data frame processing module 403c and GFP client management frame and the complex of client data frame Demultiplexing/demultiplexing unit 403d. The functions of other modules in this embodiment, such as the service interface module 402 and the encapsulation module 404 in other forms, are the same as those of the corresponding modules in FIG. 2 . In this embodiment, the parallel bus 407 is adopted between the input and output module MCU 406 of monitoring information and the GFP framing module 403, including: 8-bit wide data bus Dat[7..0], address bus Address, read-write control R/W, chip select signal CS and interrupt signal INT.

FIG. 6 is a schematic diagram of a GFP frame format used to transmit monitoring information in an embodiment of the present invention. PTI is set as a reserved value other than the value specified in the standard. All values in Fig. 6 are expressed in binary, and only two kinds of 000 and 100 are defined in the standard, so any value other than this can be adopted here, such as defining PTI= 101. Set PTI=101 when transmitting monitoring information, judge whether PTI is 101 to judge whether the information of this GFP frame is monitoring information when receiving, the value of UPI can be any value at this moment, needn't set and distinguish.

Fig. 7 is a schematic diagram of a GFP frame format used to transmit monitoring information in another embodiment of the present invention. As shown in Figure 7, set the PTI to 100, that is, the standard specifies the GFP management frame, and all values in the figure are expressed in binary. At this time, the type of UPI must be set again, and UPI is set to any reserved value other than the value specified in the standard. Only two types of 00000001 and 00000010 are defined in the standard, so the UPI can be set here to any value of other reserved values, such as setting UPI=10001000. Set PTI=100, UPI=10001000 when transmitting monitoring information, judge whether PTI is 100, and UPI is 10001000 to judge whether the information of the GFP frame is monitoring information when receiving, and must set and distinguish PTI and UPI at the same time value. Wherein, the corresponding Chinese and English meanings in the frame structures in FIG. 6 and FIG. 7 are the same as those described above for FIG. 1 .

The client management frame transmission using GFP in the present invention can be an additional message between other communication devices besides monitoring information. The invention overcomes the shortcomings in the prior art and solves the problems in the prior art. Use the service to transmit additional information along the road to meet various needs, such as fault transparent transmission, monitoring information, etc. Reduce the cost of using a dedicated channel, achieve flexibility, high-efficiency and more robust data encapsulation; GFP frames have fixed overhead, and traffic management and QoS control are more convenient; GFP runs multiple protocols from different ports or links to share the same transmission channel, thereby increasing bandwidth utilization.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. A device for transmitting additional information, characterized in that it includes a GFP framing module, which is used to carry out GFP encapsulation to the additional information sent by the client management frame of the general framing procedure at the sending end and to receive at the receiving end Analyzing the additional information frame encapsulated by the GFP, recovering the additional information so as to transmit the additional information between communication devices; When performing GFP encapsulation on the additional information, the GFP framing module further configures the GFP frame by setting the value of the payload type indication field of the GFP frame and/or the value of the client signal indication field of the GFP frame to a reserved value. Additional information for GFP encapsulation; The device further includes: Additional information input channel; An additional information input module, configured to input additional information to the GFP framing module through the additional information input channel; and/or, Additional information output channel; An additional information output module, configured to receive and analyze the additional information frame encapsulated by the GFP framing module from the additional information output channel, and restore the additional information; The additional information input/output module is an MCU processor; and/or, the additional information input/output module realizes the interface of additional information with the outside through an Ethernet interface; and/or, the additional information input/output The module is connected with the GFP framing module by a parallel bus or a serial bus. 2. The device according to claim 1, wherein the GFP framing module is further used to utilize the client data frame of the general framing procedure to carry out GFP encapsulation to the client service data and to perform GFP encapsulation on the receiving end after GFP encapsulation. The customer service data frame is analyzed, and the customer service data is recovered to transmit the customer service data. 3. The device according to claim 2, further comprising: Business channel, used to access customer business; The service interface is used to complete the access of customer services and complete the encoding and decoding of services. 4. The device according to claim 3, further comprising an encapsulation module in another form, which is used to re-encapsulate the client data frame and the additional information frame encapsulated by GFP. 5. The device according to claim 2, wherein the GFP framing module at the receiving end is further used to identify the received value according to the value of the GFP frame payload type indication field and/or the value of the GFP frame client signal indication field Customer data and/or additional information in GFP frames. 6. The device according to claim 2, wherein the GFP framing module further comprises: The main processor interface is used to connect the additional information input and/or output module and the GFP framing module; The customer management frame processing module is used to utilize the customer management frame to perform GFP framing processing on the additional information; A customer data frame processing module, configured to use the customer data frame to perform GFP framing processing on the customer business data; and The multiplexing and demultiplexing unit is configured to multiplex and/or demultiplex the GFP client management frame and/or client data frame. 7. A method for transmitting additional information applicable to the device according to any one of claims 1 or 3-6, characterized in that it comprises: Step A, the GFP framing module uses the client management frame of the general framing procedure to perform GFP encapsulation on the additional information sent; and Step B, a step of parsing the received additional information frame encapsulated by the GFP at the receiving end to recover the additional information; The step of GFP encapsulating the additional information by the GFP framing module further includes the step of setting the payload type indication field of the GFP frame and/or the value of the client signal indication field of the GFP frame to a reserved value; Before the step A, the additional information input module further includes the step of inputting additional information to the GFP framing module through the additional information input channel; and, after the step B, the additional information output module further includes receiving from the additional information output channel A step of parsing the additional information frame encapsulated by the GFP and recovering the additional information; The GFP framing module is further connected to the additional information input module and/or the additional information output module through a parallel bus or a serial bus. 8. The method according to claim 7, further comprising: In step a, the GFP framing module uses the client data frame of the general framing procedure to perform GFP encapsulation on the sent client service data; and Step b, a step of analyzing the received client service data frame encapsulated by GFP at the receiving end, and recovering the client service data. 9. The method according to claim 8, further comprising the step of re-encapsulating the GFP-encapsulated client data frame and the additional information frame. 10. The method according to claim 8, further comprising, at the receiving end, the GFP framing module identifying the received GFP frame according to the value of the GFP frame payload type indication field and/or the value of the GFP frame client signal indication field Steps for customer data and additional information in GFP frames.

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