CN100525241C - Method of implementing data message transmission supported by multiprotocol - Google Patents
Method of implementing data message transmission supported by multiprotocol Download PDFInfo
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- CN100525241C CN100525241C CNB2004100075964A CN200410007596A CN100525241C CN 100525241 C CN100525241 C CN 100525241C CN B2004100075964 A CNB2004100075964 A CN B2004100075964A CN 200410007596 A CN200410007596 A CN 200410007596A CN 100525241 C CN100525241 C CN 100525241C
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Abstract
For data messages based on different protocols needed to transmit through low voltage differential signal bus, the disclosed method packets the said data messages directly and sends them out without needed precondition of sectioning and assembling data. The invention simplifies design of networking devices. When standard encapsulation scheme such as general framing protocol is adopted, data transmission in high rate can be carried out for data message in different protocol since own transfer characteristic of data frame based on general framing protocol. The standard encapsulation scheme provides expandability for data message packet in other protocols. In the invention, more information of logic channel is contained in cell header of low voltage differential signal. Thus, network access device can support more terminal users so as to raise use ratio and increase transmission rate.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to a kind of method of supporting that multi-protocols realize the data message transmission.
Background technology
In broadband network system, the wideband network terminal user is by the broadband access equipment accessing to wide band network, broadband access equipment is realized terminal use's circuit tandem function, converging on one or more up link and transmit from network terminal user's data message such as ATM (asynchronous transfer mode) cell, IP (Internet protocol) data message etc., simultaneously, broadband access equipment is distributed to network terminal user to the data message from up link.
When data message transmits in broadband access equipment, must transmit by the core bus of broadband access equipment.In broadband access equipment, core bus generally can adopt ATM bus, industry ethernet or universal serial bus.Universal serial bus such as LVDS (Low Voltage Differential Signal) bus, CML (electric current logical model) bus etc.
Because different terminal uses can adopt the data message based on different agreement, so broadband access equipment should satisfy the requirement of supporting simultaneously based on the data message transmission of different agreement, promptly the core bus of broadband access equipment need be supported the transmission based on the data message of different agreement simultaneously.
At present, when the core bus of broadband access equipment adopts the LVDS bus, generally use the transmission method of Cell OverLVDS (cell on the Low Voltage Differential Signal bus) to satisfy broadband access equipment and support transmission requirement simultaneously based on the data message of different agreement.
The transmission method that adopts Cell Over LVDS mainly is the transmission requirement for the ATM cell that satisfies the terminal use.When the ATM cell in the end user interface equipment that is connected with broadband access equipment need be transmitted in broadband access equipment, ATM cell in the end user interface equipment can be mapped directly on the LVDS cell, then the LVDS cell be transmitted by transparent transmission mode in the LVDS of broadband access equipment core bus.But, when the data message in the end user interface equipment adopts the ethernet frame encapsulation, at first end user interface equipment need realize that ethernet data frame arrives the Data Format Transform of ATM cell, after ethernet data frame is converted to ATM cell, again the ATM cell encapsulation is mapped on the LVDS cell.Promptly after realizing ATMSAR (segmentation and assembling) process, again the LVDS cell is transmitted by transparent transmission mode in the LVDS of network access equipment core bus.Adopt the transmission method of Cell Over LVDS, the LVDS cell is the Frame of regular length.
In sum, when the core bus of broadband access equipment adopts the LVDS bus in the prior art, if data message adopts the Ethernet data frame format, end user interface equipment need be realized ATM SAR process, and when data message be non-ATM cell, during the other forms of data message of non-Ethernet frame encapsulation, end user interface equipment also needs to realize other Data Format Transform processes, or the core bus of broadband access equipment adopts multiple bus form simultaneously, make end user interface equipment, broadband access equipment back plate design complex structure, the cost height, data message transmission cost height.
Summary of the invention
The objective of the invention is to, a kind of method of supporting that multi-protocols realize the data message transmission is provided, to realize improving the purpose of data message transmission rate.
Pass through said method, carry out under the prerequisite of segmentation and assembling not needing, when the encapsulation scheme that utilizes standard, and in header during the more logical channel information of carrying, the present invention is when improving the data message transmission rate, also reduce the cost of the network equipment, improved network equipment utilance.
For achieving the above object, a kind of method of supporting that multi-protocols realize the data message transmission provided by the invention comprises:
A, definite data message based on different agreement that need on the Low Voltage Differential Signal bus of broadband access equipment, transmit;
B, described data message directly is encapsulated as data frame in prearranged format;
C, the Frame after the described encapsulation is encapsulated in the Low Voltage Differential Signal cell, and with described Low Voltage Differential Signal cell by described Low Voltage Differential Signal bus transfer.
Described data message based on different agreement comprises: ethernet data frame, ATM cell.
Described data frame in prearranged format comprises the Frame based on generic framing procedure, GFP.
Described step b comprises:
B1, determine its corresponding identification according to the data message loaded information that receives;
B2, data message and its corresponding identification of described reception directly is encapsulated as data frame in prearranged format.
Described step b2 comprises for ATM cell:
Adopt transparent transmission mode to be encapsulated as Frame the ATM cell of described reception and its corresponding identification according to generic framing procedure, GFP based on generic framing procedure, GFP.
Described step b2 comprises for ethernet data frame:
Adopt transparent transmission mode to be encapsulated as Frame the ATM cell of described reception and its corresponding identification according to generic framing procedure, GFP based on generic framing procedure, GFP.
In the sign described in the technique scheme is packaged in PTI byte based on the type field of the Frame of generic framing procedure, GFP.
Described step c comprises:
Described Frame based on generic framing procedure, GFP is encapsulated in the load of Low Voltage Differential Signal cell, and with this cell by described Low Voltage Differential Signal bus transfer.
Described method also comprises: with each logical channel information-bearing of broadband access equipment user side in the header of Low Voltage Differential Signal cell.
Each logical channel information of described broadband access equipment user side comprises 64 logical channel information based on the broadband access equipment of asynchronous transfer mode.
Description by technique scheme can obviously be learnt, the present invention will be by will directly being encapsulated in the data frame in prearranged format based on the data message of different agreement, avoided having simplified the design of network access equipment based on segmentation and assembling process before the data message encapsulation of different agreement; When data frame in prearranged format adopts the encapsulation scheme of standard to encapsulate as adopting generic framing procedure, GFP, because generic framing procedure, GFP can be supported the encapsulation of the data message of fixed length and random length simultaneously, make the Low Voltage Differential Signal cell can be the Frame of fixed length, also can be the Frame of random length; Simultaneously owing to, make the transfer of data that to carry out two-forty based on the data message of different agreement based on the transmission characteristic of the Frame of generic framing procedure, GFP itself; By the encapsulation scheme of employing standard, with the encapsulation of data message corresponding identification,, make the range of application of broadband access equipment more extensive for the data message encapsulation of other agreements from now on provides extensibility; The present invention also passes through the more logical channel information-bearing of broadband access equipment to make broadband access equipment can support more terminal use simultaneously in the header of Low Voltage Differential Signal; Thereby realize reducing the cost of the network equipment, improve network equipment utilance, improve the purpose of data message transmission rate.
Description of drawings
Fig. 1 is the type field formal definition schematic diagram of the Frame based on generic framing procedure, GFP of the present invention;
Fig. 2 is that ethernet data frame of the present invention adopts the frame mapped mode to carry out the schematic diagram of encapsulation process;
Fig. 3 is that asynchronous transfer mode of the present invention adopts transparent transmission mode to carry out the schematic diagram of encapsulation process;
Fig. 4 is the formal definition schematic diagram of Low Voltage Differential Signal header of the present invention.
Embodiment
Core concept of the present invention is: for the data message based on different agreement that need transmit on the Low Voltage Differential Signal bus, under the prerequisite of segmentation that does not need to carry out data message and assembling, directly data message is encapsulated as data frame in prearranged format, then, data frame in prearranged format is passed through the Low Voltage Differential Signal bus transfer.
Based on above-mentioned core concept, the present invention at first needs and will carry out directly being encapsulated as data frame in prearranged format under the prerequisite of segmentation and assembling not needing based on the data message of different agreement.
Because the different network terminals user may need to carry out the transmission based on the data message of different agreement, as the transmission of ethernet data frame, the transmission of ATM cell, and ethernet data frame is the random length data message, ATM cell is the fixed-length data message, if the data frame in prearranged format of choosing is only supported the fixed-length data message, will certainly cause Frame need carry out segmentation and assembling process.
Generic framing procedure, GFP can be supported the direct encapsulation of fixed length and random length data message simultaneously, so choosing of data frame in prearranged format, can adopt based on generic framing procedure, GFP the data message that receives is encapsulated as Frame based on generic framing procedure, GFP, because it is the encapsulation scheme of standard that generic framing procedure, GFP carries out the data message encapsulation, help the encapsulation of the data message of other agreements from now on like this, for the transmission of the data message of from now on each agreement is laid a good foundation.Although the present invention also can select some off-gauge encapsulation schemes for use, realize transmission requirement based on the data message of different agreement, off-gauge encapsulation scheme poor expandability is unfavorable for the development of data message transmission from now on.
For distinguishing the data message that is based on what agreement that encapsulates in the Frame based on generic framing procedure, GFP easily, as encapsulation is ethernet data frame, or ATM cell, need be when the data message be directly encapsulated specified data message corresponding identification, the present invention can be by setting up the data message corresponding identification of determining reception based on the data message of different agreement and the corresponding relation of sign.Sign and data message are encapsulated in the Frame based on generic framing procedure, GFP together, like this, the sign that encapsulates in the opposite end network node can be by the Frame based on generic framing procedure, GFP is convenient judges the data message what agreement packed data message is based on accurately.
The data message corresponding identification can be encapsulated in the PTI byte based on the TYPE of the Frame of generic framing procedure, GFP (type) field.TYPE field data formal definition as shown in Figure 1.
In Fig. 1, the TYPE field comprises two bytes, and first byte comprises PTI, PFI, EXI, and second byte comprises UPI.The present invention will be encapsulated among the PTI based on the data message corresponding identification of different agreement.As when adopting PTI=101, what encapsulate in the Frame of expression based on generic framing procedure, GFP is ATM cell, and during PTI=111, what encapsulate in the Frame of expression based on generic framing procedure, GFP is ethernet data frame.Because PTI comprises three bits, when needs will be encapsulated as Frame based on generic framing procedure, GFP based on the data message of other agreements, also can be provided with flexibly PTI.
Generic framing procedure, GFP is when encapsulating ethernet data frame, because ethernet data frame is the Frame of random length, so generic framing procedure, GFP can adopt the frame mapped mode that it is carried out encapsulation process, promptly receive a complete ethernet data frame and again it is carried out encapsulation process afterwards.Generic framing procedure, GFP is when encapsulating ATM cell, because ATM cell is the Frame of fixed length, so generic framing procedure, GFP can adopt transparent transmission mode to carry out encapsulation process, promptly need not receive a complete ATM cell by the time can in time carry out encapsulation process to it.
When generic framing procedure, GFP need encapsulate the Ethernet data message, its encapsulation process schematic diagram as shown in Figure 2.
In Fig. 2, can obviously learn, ethernet data frame is the Frame of random length, its load field can be carried the 0-1514 byte, whole ethernet data frame does not need to carry out segmentation and the assembling of ATM, adopt the frame mapped mode directly it to be encapsulated in PAYLOAD (payload) field based on the Frame of generic framing procedure, GFP, the ethernet data frame corresponding identification is encapsulated in the PTI byte based on the TYPE field of the Frame of generic framing procedure, GFP.The packaged Frame that becomes a random length based on the Frame of generic framing procedure, GFP according to the byte number difference of load-carrying in the ethernet data frame.To be encapsulated in again in the LVDS load of LVDS cell based on the Frame of generic framing procedure, GFP.By technique scheme, ethernet data frame can be without segmentation and the assembling of ATM, and the method by direct encapsulation is implemented on the LVDS bus and transmits.
When generic framing procedure, GFP need encapsulate ATM cell, its encapsulation process schematic diagram as shown in Figure 3.
In Fig. 3, ATM cell is generally the Frame of fixed length, whole ATM cell is generally 53 bytes, generic framing procedure, GFP adopts transparent transmission mode directly to be encapsulated in PAYLOAD (payload) field based on the Frame of generic framing procedure, GFP ATM cell, and the ATM cell corresponding identification is encapsulated in the PTI byte based on the TYPE field of the Frame of generic framing procedure, GFP.The packaged Frame based on generic framing procedure, GFP becomes the Frame of a fixed length.To be encapsulated in again in the LVDS load of LVDS cell based on the Frame of generic framing procedure, GFP.By technique scheme, the method for ATM cell by direct encapsulation is implemented on the LVDS bus to be transmitted.
When the Frame of data frame in prearranged format employing of the present invention based on generic framing procedure, GFP, when adopting generic framing procedure, GFP that the data message based on different agreement is encapsulated, support multi-protocols provided by the invention realize that the method for data message transmission can be described as GFP OVERLVDS (Frame based on the general transmission agreement on the Low Voltage Differential Signal bus) transmission method.
In the practical application of broadband network, the terminal use transfers to end user interface equipment with the data message of its transmission, end user interface equipment owing to do not need carries out segmentation and the assembling process of the ATM of ethernet data frame, and the data message that directly need transmit on the LVDS bus is encapsulated in the Frame based on generic framing procedure, GFP, then will be based on the data frame transfer of generic framing procedure, GFP to broadband access equipment, thereby simplify the design of end user interface equipment, and, because transmission characteristic based on the Frame of generic framing procedure, GFP itself, but, realized high-speed transfer based on the data message of different agreement as characteristic such as transmit to the channel of higher rate based on the Frame time division multiplexing of generic framing procedure, GFP; Broadband access equipment will be encapsulated as the LVDS cell again based on the Frame of generic framing procedure, GFP, and the LVDS cell is gone out by the LVDS bus transfer of its backboard.The LVDS bus that only adopts the backboard of broadband access equipment can realize the data message transmission based on different agreement.
The present invention is the utilance that further improves broadband access equipment, makes broadband access equipment can support more network terminal user simultaneously, is defined as shown in Figure 4 form with having encapsulated LVDS header based on the Frame of generic framing procedure, GFP.
The LVDS header comprises 6 bytes in Fig. 4, and first byte is CA[15:8], second byte is CA[7:0], the 3rd byte comprises CASEL, UPCA, PHYID, the 4th byte comprises RSV, ACTIVE, RSV, and the 5th byte is CA[31:24], the 6th byte is CA[23:15].
Receive LVDS cell direction at the broadband access equipment local side, CA[31:0] carry the flow-control information of each logical channel of broadband access equipment user side, 64 PHY (physical address) of UTOPIA (Universal Test ﹠ Operations PHY Interface for ATM) in the corresponding broadband access equipment user side of each logical channel.
Because CA[31:0] have only 32, can support 64 logical channels simultaneously for the LVDS bus that makes the broadband access equipment user side, the present invention is with CASEL byte and CA[31:0] be used, make the LVDS bus can support 64 logical channels simultaneously.The technical scheme that is used can for:
When CASEL=' 0 ', CA[31:16] what reflect is the 32nd flow-control information to the 47th PHY of UTOPIA interface in the broadband access equipment user side, CA[15:0] what reflect is the 0th flow-control information to the 15th PHY of UTOPIA interface in the broadband access equipment user side.
When CASEL=' 1 ', CA[31:16] what reflect is the 48th flow-control information to the 63rd PHY of UTOPIA interface in the broadband access equipment user side, CA[15:0] what reflect is the 16th flow-control information to the 31st PHY of UTOPIA interface in the broadband access equipment user side.
As CA[i]=' 0 ' time, the corresponding PHY of UTOPIA interface has taken place congestedly in the expression broadband access equipment user side, and the broadband access equipment user side can not be again receives the LVDS cell that mail to this PHY from the relative logic channel of LVDS bus.
As CA[i]=' 1 ' time, the corresponding PHY of UTOPIA interface does not take place congestedly in the expression broadband access equipment user side, and the broadband access equipment user side can receive the LVDS cell that mail to this PHY from the relative logic channel of LVDS bus.
Send LVDS cell direction at the broadband access equipment local side, only need to use CA[0] the local flow-control information of indication.As CA[0]=' 0 ' time, expression broadband access equipment local side can not be again receives the LVDS cell from the broadband access equipment user side logical channel of this LVDS bus.Notice broadband access equipment user side stops to send the LVDS cell.
UPCA in the 3rd byte is 1 bit bit wide, the flow-control information of indication CPU control logic passage, UPCA=' 1 ' expression opposite end can send to the flow-control information of local cpu control logic passage, and UPCA=' 0 ' expression opposite end cannot send to the flow-control information of local cpu control logic passage.
PHYID in the 3rd byte is 6 bit bit wides, is used to refer to the kind of cell, when PHYID=' 111111 ', represents that this cell is an idle cell; When PHYID=' 111110 ', represent that the content of this cell carrying is the flow-control information of CPU control logic passage; PHYID represents that the content of carrying in this cell is from the terminal use or mail to the terminal use during for other values, and its numeric representation broadband access equipment user side receives the PHY of this cell, or the broadband access equipment local side mails to this cell the PHY of broadband access equipment user side.
The 6th bit in the 4th byte is ACTIVE, is used to refer to the state of activation of LVDS link.
The the 0th to the 5th bit and the 7th bit in the 4th byte are RSV, are reservation information.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wishes that appended claim comprises these distortion and variation.
Claims (10)
1, a kind of method of supporting that multi-protocols realize the data message transmission is characterized in that comprising:
A, definite data message based on different agreement that need on the Low Voltage Differential Signal bus of broadband access equipment, transmit;
B, described data message directly is encapsulated as data frame in prearranged format;
C, the Frame after the described encapsulation is encapsulated in the Low Voltage Differential Signal cell, and with described Low Voltage Differential Signal cell by described Low Voltage Differential Signal bus transfer.
2, a kind of method of supporting that multi-protocols realize the data message transmission as claimed in claim 1 is characterized in that described data message based on different agreement comprises: ethernet data frame, ATM cell.
3, a kind of method of supporting that multi-protocols realize the data message transmission as claimed in claim 1 or 2 is characterized in that described data frame in prearranged format comprises the Frame based on generic framing procedure, GFP.
4, a kind of method of supporting that multi-protocols realize the data message transmission as claimed in claim 3 is characterized in that described step b comprises:
B1, determine its corresponding identification according to the data message loaded information that receives;
B2, data message and its corresponding identification of described reception directly is encapsulated as data frame in prearranged format.
5, a kind of method of supporting that multi-protocols realize the data message transmission as claimed in claim 4 is characterized in that described step b2 comprises:
Adopt transparent transmission mode to be encapsulated as Frame the ATM cell of described reception and its corresponding identification according to generic framing procedure, GFP based on generic framing procedure, GFP.
6, a kind of method of supporting that multi-protocols realize the data message transmission as claimed in claim 4 is characterized in that described step b2 comprises:
Adopt frame mapped mode to be encapsulated as Frame the ethernet data frame of described reception and its corresponding identification according to generic framing procedure, GFP based on generic framing procedure, GFP.
7,, it is characterized in that described sign is packaged in the PTI byte based on the type field of the Frame of generic framing procedure, GFP as claim 4 or 5 or 6 described a kind of methods of supporting that multi-protocols realize the data message transmission.
8, as claim 4 or 5 or 6 described a kind of methods of supporting that multi-protocols realize the data message transmission, it is characterized in that described step c comprises:
Described Frame based on generic framing procedure, GFP is encapsulated in the load of Low Voltage Differential Signal cell, and with this cell by described Low Voltage Differential Signal bus transfer.
9, as claim 4 or 5 or 6 described a kind of methods of supporting that multi-protocols realize the data message transmission, it is characterized in that described method also comprises:
With each logical channel information-bearing of broadband access equipment user side in the header of Low Voltage Differential Signal cell.
10, a kind of method of supporting that multi-protocols realize the data message transmission as claimed in claim 9, each the logical channel information that it is characterized in that described broadband access equipment user side comprises 64 logical channel information based on the broadband access equipment of asynchronous transfer mode.
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| CNB2004100075964A CN100525241C (en) | 2004-02-25 | 2004-02-25 | Method of implementing data message transmission supported by multiprotocol |
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| CN102388582B (en) * | 2011-08-29 | 2014-05-07 | 华为技术有限公司 | Transmission method for adding idle bit, transmitter and network system |
| CN104869100B (en) * | 2014-02-21 | 2019-04-26 | 联想(北京)有限公司 | Communication means, communication equipment and communication system |
| CN110521285A (en) * | 2017-04-10 | 2019-11-29 | 昕诺飞控股有限公司 | System and method for improving the data rate on addressable lighting network |
| CN112114513A (en) * | 2020-09-10 | 2020-12-22 | 河南职业技术学院 | Unified direct-current coding method for position, speed, time and attitude information |
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