CN101043294A - Slicing method for data frames and optical network unit - Google Patents
Slicing method for data frames and optical network unit Download PDFInfo
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- CN101043294A CN101043294A CNA2007100882187A CN200710088218A CN101043294A CN 101043294 A CN101043294 A CN 101043294A CN A2007100882187 A CNA2007100882187 A CN A2007100882187A CN 200710088218 A CN200710088218 A CN 200710088218A CN 101043294 A CN101043294 A CN 101043294A
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Abstract
The invention discloses a slicing method of data frame that comprises: obtaining parameter group, said parameter group includes useable bandwidth of Gigabit-capable passive optical network up-bound transmission container TCONT, length of remained frame of data frame which is to be processed and length of data frame of TCONT buffer; Obtaining the minimum parameter of said parameter group, said minimum parameter is as the length of slicing to slice said data frame which is to be processed. Correspondingly, the invention discloses light network unit further. The invention can realize the flexible slicing for data frame, and increase the utilization rate of bandwidth.
Description
Technical field
The present invention relates to the Frame microtomy, relate in particular to the dicing method and the optical network unit of gigabit passive optical network uplink business data frame.
Background technology
Along with the popularization of broadband services, (Gigabit-capable Passive OpticalNetworks GPON) has obtained development fast to gigabit passive optical network; Compare with the access of point-to-point light, the GPON local side can be divided into tens of roads optical fiber and connect the user with an optical fiber, and the GPON technology reduces the networking cost greatly.Please refer to Fig. 1, be the GPON system schematic.The GPON system is made up of three parts: optical line terminal 101 (Optical Line Termination, OLT), optical branching device 102 and network unit/optical network terminal 103 (Optical Network Unit, ONU/Optical Network Termination, ONT).OLT 101 provides network side interface (SNI) for the GPON system, links to each other with optical branching device 102.Optical branching device 102 is the module of pure light, does not relate to the processing of the signal of telecommunication.ONU/ONT 103 provides user side interface (UNI) for the GPON system, links to each other with optical branching device 102.If ONU directly provides User Port Function, the ethernet user's port as PC online usefulness then is called ONT with this ONU; Succinct for what describe, in this manual, ONU/ONT is referred to as ONU.
In the GPON system, ONU treats process frames of data earlier and cuts into slices, and the Frame that cuts out is packaged into G-PON Encapsulation Mode, and (GPON Encapsulation Mode, GEM) frame adopts time-division multiplex technology then, and the GEM frame is sent to OLT.In the prior art, treating process frames of data by the following method cuts into slices: preset fixing slice length, from GPON uplink container (GPONTransmission Container, TCONT) read pending Frame in, treat process frames of data by the fixedly slice length that presets and cut into slices.Adopt when fixedly slice length is cut into slices to Frame, bandwidth availability ratio is A/ (A+5), and wherein A is fixing slice length, and unit is a byte, and 5 represent that GEM frame head length are 5 bytes; When A got smaller value, bandwidth availability ratio was not high, and when A gets higher value, if the current bandwidth that is used to transmit the GEM frame less than (A+5), then can't be utilized this bandwidth.As seen, the method underaction that adopts fixing slice length that Frame is cut into slices may cause bandwidth availability ratio not high.
Summary of the invention
The technical problem that the embodiment of the invention will solve provides the dicing method and the optical network unit of Frame, to realize that Frame is carried out flexible slicing.
For solving the problems of the technologies described above, the purpose of the embodiment of the invention is achieved through the following technical solutions:
A kind of dicing method of Frame comprises: the group that gets parms, parameter group comprise, the available bandwidth of gigabit passive optical network uplink container TCONT, the residue frame length of pending Frame and the data frame length of TCONT buffer; Obtain the minimum parameter in the parameter group, treat process frames of data with minimum parameter as slice length and cut into slices.
A kind of optical network unit comprises: the TCONT buffer is used to store pending Frame; Parameter acquiring unit, the group that is used to get parms, parameter group comprise, the residue frame length of the available bandwidth of TCONT, pending Frame and the data frame length of TCONT buffer; Minimum parameter obtains the unit, is used for obtaining the minimum parameter of the parameter group that parameter acquiring unit obtains, and sends minimum parameter; The section unit is used to receive minimum parameter and obtains the minimum parameter that the unit sends, and reads pending Frame from the TCONT buffer, treats process frames of data with minimum parameter as slice length and cuts into slices.
As can be seen from the above technical solutions, in the embodiment of the invention, the ONU group that gets parms, parameter group comprises, the available bandwidth of gigabit passive optical network uplink container TCONT, the residue frame length of pending Frame and the data frame length of TCONT buffer; Further obtain the minimum parameter in the parameter group, treat process frames of data with minimum parameter as slice length and cut into slices; The technical program can realize Frame is carried out flexible slicing; If employing fixedly slice length is cut into slices to Frame, when the fixing slice length hour of the available bandwidth ratio of TCONT, then insert idle frame, and the technical program can be cut into slices the available bandwidth of TCONT as slice length, thereby made full use of the bandwidth of TCONT, improved bandwidth availability ratio.
Description of drawings
Fig. 1 is the GPON system schematic of prior art;
Fig. 2 is the flow chart that the ONU of the embodiment of the invention sends the GEM frame;
Fig. 3 is the GEM frame structure schematic diagram of the embodiment of the invention;
Fig. 4 is the ONU structural representation of the embodiment of the invention.
Embodiment
The embodiment of the invention provides the dicing method and the optical network unit of Frame.The ONU group that gets parms, parameter group comprises, the available bandwidth of gigabit passive optical network uplink container TCONT, the residue frame length of pending Frame and the data frame length of TCONT buffer; Further obtain the minimum parameter in the parameter group, treat process frames of data with minimum parameter as slice length and cut into slices; If minimum parameter is the residue frame length of pending Frame, then treats process frames of data as slice length and cut into slices with the residue frame length of pending Frame; If minimum parameter is the data frame length of TCONT buffer, then treats process frames of data as slice length and cut into slices with the data frame length of TCONT buffer.
Please refer to Fig. 2, send the flow chart of GEM frame for the ONU of the embodiment of the invention; Below in conjunction with this flow chart, the embodiment of the invention is described in detail.
Step 201.ONU obtains pending Frame, and writes in the TCONT buffer.
Above-mentioned pending Frame comprises, time division multiplexing (Time Division Multiplexing, TDM) Frame, Ethernet (Ethernet) Frame and ONU management control interface (ONU Management andControl Interface, OMCI) Frame.Need to prove; except that above-mentioned 3 kinds of Frames; other Frame that transmits in the GPON network also can use the method for the embodiment of the invention, and the Frame that transmits in all GPON networks uses thinking of the present invention to realize purpose of the present invention, all belongs to the scope of protection of the invention.
Wherein, the inner OMCI Frame that produces of ONU, OMCI Frame are used for transmission operation management maintain information between ONU and the OLT; Speech ciphering equipment that links to each other with ONU or miscellaneous equipment send the tdm data frame to ONU; Ethernet device that links to each other with ONU or miscellaneous equipment send the Ethernet Frame to ONU.After ONU obtains pending Frame, stamp marks such as frame type and frame length for pending Frame, and pending Frame is deposited in the TCONT buffer.Above-mentioned TCONT buffer can be the physical cache of one group of constant depth.
Step 203.ONU cuts into slices to pending Frame.
The ONU group that gets parms, parameter group comprises, the available bandwidth of gigabit passive optical network uplink container TCONT, the residue frame length of pending Frame and the data frame length of TCONT buffer.
The available bandwidth of TCONT refers to, before cutting into slices, according to GPON transmission convergence sublayer (GPONTransmission Convergence layer, GTC) bandwidth information that OLT issues is received in the unit, calculate current TCONT and can be used to transmit the bandwidth of GEM frame, and this bandwidth is deducted GEM frame head length; The available bandwidth of TCONT can be regarded the maximum length that allows to send Frame to be sent as.Such as, calculating current TCONT transmission bandwidth is 500 bytes, then the available bandwidth of TCONT is a 500-5=495 byte; If with 200 bytes is slice length, then through after once cutting into slices, the available bandwidth of TCONT is 495-200-5=290 byte; Wherein, GEM frame head length is 5 bytes.The bandwidth that above-mentioned OLT issues can be fixed, and also can be dynamically to adjust.
The residue frame length of pending Frame refers to that total frame length of pending Frame deducts the frame length that this frame has been cut into slices; If pending Frame is for being cut into slices for the first time, then the residue frame length of pending Frame is total frame length of pending Frame.When pending Frame is read, the indication information of frame length is arranged in first data that are read out from the TCONT buffer; In the present embodiment, section (CUT) unit can be recorded in the frame length of Frame in the frame length counter, whenever reads Frame just deducts the sense data frame from the frame length counter length; After Frame is cut into slices, the residue frame length of the pending Frame that the value of frame length counter is cut into slices for this Frame next time.
The data frame length of TCONT buffer refers to, before cutting into slices, and the Frame total bytes of TCONT buffer stores.The Frame of TCONT buffer storage is dynamic, and on the one hand, ONU constantly writes the Frame of new acquisition in the TCONT buffer, and on the other hand, the section unit is constantly read Frame from the TCONT buffer.
ONU obtains the minimum parameter in the above-mentioned parameter group, and with this minimum parameter as slice length, treat process frames of data and cut into slices.In embodiments of the present invention, 3 parameters in the parameter group are unit with the byte.Be understandable that the method that obtains minimum parameter is a lot, such as, use method relatively, from 3 parameters, obtain minimum parameter.
For guaranteeing the efficient of section, another embodiment on the basis of present embodiment is: preset minimum slice length; When ONU obtains minimum parameter in the above-mentioned parameter group,, then treat process frames of data as slice length and cut into slices with the available bandwidth of TCONT if minimum parameter is the available bandwidth of TCONT; If minimum parameter is the residue frame length of pending Frame, then treats process frames of data as slice length and cut into slices with the residue frame length of pending Frame; If minimum parameter is the data frame length of TCONT buffer, whether the data frame length of then judging the TCONT buffer is not less than the minimum slice length that presets, if, treating process frames of data with the data frame length of TCONT buffer as slice length cuts into slices, otherwise, do not treat process frames of data and cut into slices.Be understandable that minimum slice length can be adjusted according to actual conditions.
Below the bandwidth availability ratio of the embodiment of the invention is illustrated.Calculating current TCONT transmission bandwidth is 160 bytes, and then the available bandwidth of TCONT is the 160-5=155 byte; The residue frame length of pending Frame is 500 bytes; The data frame length of TCONT buffer is 500 bytes.If adopt slice length to be fixed as the regular length dicing method of 80 bytes, the Frame length of being cut for the first time is 80 bytes, the available bandwidth of section back TCONT is the 155-80-5=70 byte, can't proceed section less than regular length, then insert idle (IDLE) frame, bandwidth availability ratio is 80/160=50%.If adopt the dicing method of the embodiment of the invention, below in 3 parameters: the residue frame length of the available bandwidth of TCONT, pending Frame and the data frame length of TCONT buffer, the available bandwidth minimum of TCONT, so cut into slices as slice length with the available bandwidth of TCONT, bandwidth availability ratio is 155/160=97%, and visible the technical program can improve bandwidth availability ratio.
Step 204.ONU is packaged into the GEM frame to Frame.
Please refer to Fig. 3, be the GEM frame structure schematic diagram of the embodiment of the invention.Wherein, (Payload Length Indicator PLI) is used to indicate the length of fragment load for loaded length indication; Service port number (PORT ID) is used for the type of service of representative data frame; (Payload TypeIndicator PTI) is used to indicate the type of GEM frame for load type indication; (Header ErrorControl HEC) is used to carry out error checking and correction in GEM frame head verification error correction; Fragment load (Fragment Payload) is used to load pending Frame.
Above-mentioned PLI takies 12 bits, and PORT ID takies 12 bits, and PTI takies 3 bits, and HEC takies 13 bits, and these 4 territories take 5 bytes altogether, are collectively referred to as the GEM frame head.ONU writes pending Frame in the fragment load of GEM frame, and revises the parameter of GEM frame head, sends to the GTC unit then.
Step 205.GTC unit sends the GEM frame to optical line terminal.The GTC unit uses time-division multiplex technology, in the time period that up direction distributes, the GEM frame of encapsulation in the step 204 is sent to OLT.
Be understandable that, adopt step 201 to the embodiment of step 205 be one embodiment of the present of invention; Adopt step 201, step 203 to step 205 can be formed an alternative embodiment of the invention, and in this embodiment, ONU does not treat the type of process frames of data and discerns, and whole pending Frames are cut into slices earlier and carried out the GEM encapsulation again.
Please refer to Fig. 4, be the ONU structural representation of the embodiment of the invention.This ONU 400 comprises that Frame recognition unit 401, parameter acquiring unit 402, minimum parameter obtain unit 403, TCONT buffer 405, section unit 404, GEM frame encapsulation unit 406 and GTC unit 407.
Frame recognition unit 401 is used to discern the type of pending Frame, is ethernet data frame if identify pending Frame, then notifying parameters acquiring unit 402 group that gets parms.
Parameter acquiring unit 402, the group that is used to get parms, described parameter group comprise, the residue frame length of the available bandwidth of TCONT, pending Frame and the data frame length of TCONT buffer.
Minimum parameter obtains unit 403, is used for obtaining the minimum parameter of the parameter group that parameter acquiring unit 402 obtains, and sends minimum parameter.
TCONT buffer 405 is used to store pending Frame.
Section unit 404 is used to receive minimum parameter and obtains the minimum parameter that unit 403 sends, and reads pending Frame from TCONT buffer 405, treats process frames of data with minimum parameter as slice length and cuts into slices.
GEM frame encapsulation unit 406 is used for the Frame that section unit 404 cuts out is packaged into the GEM frame, and sends this GEM frame.
GTC unit 407 when being used to receive the GEM frame of GEM frame encapsulation unit transmission, sends the GEM frame to optical line terminal.
After ONU 300 obtains pending Frame, stamp marks such as frame type and frame length for pending Frame, write in the TCONT buffer.Above-mentioned pending Frame comprises, tdm data frame, Ethernet Frame and OMCI Frame.Need to prove; except that above-mentioned 3 kinds of Frames; other Frame that transmits in the GPON network also can use the ONU of the embodiment of the invention, and the Frame that transmits in all GPON networks uses thinking of the present invention to realize purpose of the present invention, all belongs to the scope of protection of the invention.Frame recognition unit 401 is treated the type of process frames of data and is discerned, and is ethernet data frame if identify pending Frame, then notifying parameters acquiring unit 402 group that gets parms.Parameter acquiring unit 402 group that is used to get parms, described parameter group comprises, the residue frame length of the available bandwidth of TCONT, pending Frame and the data frame length of TCONT buffer.Minimum parameter in the parameter group that minimum parameter acquisition unit 403 acquisition parameter acquiring unit 402 are obtained; Section unit 404 receives minimum parameter and obtains the minimum parameter that unit 403 sends, and reads pending Frame from TCONT buffer 405, treats process frames of data with minimum parameter as slice length and cuts into slices.GEM frame encapsulation unit 406 is packaged into the GEM frame to the Frame that section unit 404 cuts out.GTC unit 407 sends the GEM frame of GEM frame encapsulation unit 406 encapsulation to optical line terminal.
For the efficient that guarantees to cut into slices, another embodiment on the basis of present embodiment is: above-mentioned section unit 404 comprises parameter processing unit and parameter transmitting element.Parameter processing unit is used for obtaining the minimum parameter of the parameter group that parameter acquiring unit 402 obtains, and sends minimum parameter to the parameter transmitting element.The parameter transmitting element is used to receive the minimum parameter that parameter processing unit sends, if minimum parameter is the available bandwidth of TCONT, then sends minimum parameter; If minimum parameter is the residue frame length of pending Frame, then send minimum parameter; If minimum parameter is the data frame length of TCONT buffer, judge then whether the data frame length of TCONT buffer is not less than the minimum slice length that presets, if send minimum parameter.Preset minimum slice length, when minimum parameter obtains unit 403 and obtains minimum parameter in the parameter group that parameter acquiring unit 402 obtain,, then send minimum parameter if minimum parameter is the available bandwidth of TCONT; If minimum parameter is the residue frame length of pending Frame, then send minimum parameter; If minimum parameter is the data frame length of TCONT buffer, judge then whether the data frame length of TCONT buffer is not less than the minimum slice length that presets, if send minimum parameter; Cut into slices according to this minimum parameter in section unit 404.
Be understandable that, comprise that Frame recognition unit 401, parameter acquiring unit 402, minimum parameter obtain the ONU of unit 403, TCONT buffer 405, section unit 404, GEM frame encapsulation unit 406 and GTC unit 407, are one embodiment of the present of invention; Comprise that parameter acquiring unit 402, minimum parameter obtain the ONU of unit 403, TCONT buffer 405, section unit 404, GEM frame encapsulation unit 406 and GTC unit 407, be an alternative embodiment of the invention, in this embodiment, do not treat the type of process frames of data and discern, whole pending Frames are cut into slices earlier and are carried out the GEM encapsulation again.
As can be seen from the above technical solutions, in the embodiment of the invention, the ONU group that gets parms, parameter group comprises, the available bandwidth of gigabit passive optical network uplink container TCONT, the residue frame length of pending Frame and the data frame length of TCONT buffer; Further obtain the minimum parameter in the parameter group, treat process frames of data with minimum parameter as slice length and cut into slices; The technical program can realize Frame is carried out flexible slicing; If employing fixedly slice length is cut into slices to Frame, when the fixing slice length hour of the available bandwidth ratio of TCONT, then insert idle frame, and the technical program can be cut into slices the available bandwidth of TCONT as slice length, thereby made full use of the bandwidth of TCONT, improved bandwidth availability ratio.
Further, in the technical program, preset minimum slice length, for following 3 parameters, the residue frame length of the available bandwidth of TCONT, pending Frame and the data frame length of TCONT buffer if minimum parameter is the data frame length of TCONT buffer, judge then whether the data frame length of TCONT buffer is not less than the minimum slice length that presets, if treat process frames of data with the data frame length of TCONT buffer as slice length and cut into slices; Thereby guarantee the efficient of section.
Further, in the technical program, treat the type of process frames of data and discern, if pending Frame is tdm data frame or OMCI Frame, do not cut into slices, directly carry out the GEM encapsulation, if pending Frame is the Ethernet Frame, cut into slices earlier, carry out the GEM encapsulation again; Thereby improve the treatment effeciency of ONU.
Need to prove that GPON is that EPON (do not get rid of and Frame dicing method of the present invention and optical network unit can be applied in other technology in PON field by Passive Optical Network, PON) wherein a kind of technology in field.
More than the dicing method and the optical network unit of the Frame that the embodiment of the invention provided is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the dicing method of a Frame is characterized in that, comprising:
The group that gets parms, described parameter group comprises, the available bandwidth of gigabit passive optical network uplink container TCONT, the residue frame length of pending Frame and the data frame length of TCONT buffer;
Obtain the minimum parameter in the described parameter group, as slice length described pending Frame is cut into slices with described minimum parameter.
2. dicing method according to claim 1 is characterized in that, described as slice length described pending Frame the section with described minimum parameter is:
If described minimum parameter is the available bandwidth of described TCONT, then as slice length described pending Frame is cut into slices with the available bandwidth of described TCONT; If described minimum parameter is the residue frame length of described pending Frame, then as slice length described pending Frame is cut into slices with the residue frame length of described pending Frame; If described minimum parameter is the data frame length of described TCONT buffer, whether the data frame length of then judging described TCONT buffer is not less than the minimum slice length that presets, if as slice length described pending Frame is cut into slices with the data frame length of described TCONT buffer.
3. dicing method according to claim 1 is characterized in that, after described the section, the Frame that cuts out is packaged into Gigabit passive optical network packaging mode GEM frame.
4. dicing method according to claim 3 is characterized in that, behind the described encapsulation GEM frame, sends described GEM frame to optical line terminal.
5. according to any described dicing method of claim 1 to 4, it is characterized in that, before the described group that gets parms, further comprise: determine that pending Frame is an ethernet data frame.
6. an optical network unit is characterized in that, comprising:
The TCONT buffer is used to store pending Frame;
Parameter acquiring unit, the group that is used to get parms, described parameter group comprise, the residue frame length of the available bandwidth of TCONT, pending Frame and the data frame length of TCONT buffer;
Minimum parameter obtains the unit, is used for obtaining the minimum parameter of the parameter group that described parameter acquiring unit obtains, and sends described minimum parameter;
The section unit is used to receive described minimum parameter and obtains the minimum parameter that the unit sends, and reads pending Frame from described TCONT buffer, described pending Frame is cut into slices as slice length with described minimum parameter.
7. optical network unit according to claim 6 is characterized in that, described minimum parameter obtains the unit and comprises:
Parameter processing unit is used for obtaining the minimum parameter of the parameter group that described parameter acquiring unit obtains, and sends described minimum parameter to the parameter transmitting element;
The parameter transmitting element is used to receive the minimum parameter that described parameter processing unit sends, if described minimum parameter is the available bandwidth of described TCONT, then sends described minimum parameter; If described minimum parameter is the residue frame length of described pending Frame, then send described minimum parameter; If minimum parameter is the data frame length of described TCONT buffer, judge then whether the data frame length of described TCONT buffer is not less than the minimum slice length that presets, if send described minimum parameter.
8. optical network unit according to claim 6 is characterized in that, further comprises:
GEM frame encapsulation unit is used for the Frame that described section unit cuts out is packaged into the GEM frame, and sends described GEM frame.
9. optical network unit according to claim 8 is characterized in that, further comprises:
The GTC unit when being used to receive the GEM frame of described GEM frame encapsulation unit transmission, sends described GEM frame to optical line terminal.
10. according to any described optical network unit of claim 6 to 9, it is characterized in that, further comprise:
The Frame recognition unit is used to discern the type of pending Frame, is ethernet data frame if identify described pending Frame, then notifies the described parameter acquiring unit group that gets parms.
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