CN101431451B - Method and system for building PDU in broad band wireless access system - Google Patents
Method and system for building PDU in broad band wireless access system Download PDFInfo
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Abstract
The invention discloses a PDU packing method in broadband wireless access system and its system. The method comprises: step 1, acquiring SDU, performing corresponding PDU processing according to if packet function is supported when splitting method is not supported; step 2, packaging the packed PDU, subjecting the packaged PDU to subsequent flow. The invention provides a method for packing PDU without splitting, which largely reduces complexity and time for packing PDU; when the bandwidth acquired by the linkage is not sufficient to packing minimum PDU, the packing of PDU ends, thereby promoting bandwidth utilization and solving abnormity problem of IEEE802.16. The invention is easily to accomplish.
Description
Technical field
The present invention relates to WiMAX access technology field, particularly relate to the method and the system thereof that SDU (Service Data Unit, Service Data Unit) are formed MAC PDU (Protocol Data Unit, protocol Data Unit) under a kind of not burst situation.
Background technology
As the WiMAX access technology, it includes gauze, two kinds of networks of wireless network.The data of wired network transmission are bag; The data of wireless network transmission are MAC (Medium Access Control Layer, media access control layer) PDU, and it is the data cell that transmits message between BS (Base Station, base station) and the MS (Mobile Station, travelling carriage).For wireless access, data flow need correspondingly, need IP to wrap the mutual conversion of MAC PDU data cell from wired network to the wireless network two-way flow.
Organize the complexity of the method affect system of MAC PDU, influence the bandwidth availability ratio of system.To the communication system that has the strict time limit to require, good group PDU method will effectively reduce system delay.
IEEE802.16 protocol groups PDU flow process default situations burst (Fragment) is to support at present, and agreement does not consider not support the burst situation.
According to the PDU form, the PDU maximum length is 2047Byte, and under the situation of burst, agreement is not considered the maximum length of a PDU.
Under the burst situation; Agreement is not considered to organize minimum PDU length situation (MAC head+other sub-head+CRC) inadequately when remaining bandwidth yet; The flow process of organizing PDU in this case will occur unusually; Wherein MAC (Media Access Control) is medium access control, and CRC (Cyclic Redundancy Check) is CRC.
Summary of the invention
Technical problem to be solved by this invention is to provide method and the system thereof of group PDU in a kind of BWA, is used to solve the problem not supporting can't organize under the burst situation PDU.
To achieve these goals, the invention provides the method for group PDU in a kind of BWA, comprising:
Step 1 is obtained SDU, and is not supporting burst, and during support group packet function, one or more said SDU is organized into a PDU, judges whether the existing PDU of continuous group,
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if less than, said SDU then is set is the state of being untreated, change said step 2 over to; If greater than, whether the length sum of then judging former PDU, said SDU, group steamed stuffed bun head again is greater than the PDU maximum length; If the length sum is greater than the PDU maximum length, then said former PDU can not hold said SDU again, and said SDU is set to the state of being untreated, and changes said step 2 over to; Otherwise said SDU is organized into said former PDU, and behind interpolation group steamed stuffed bun head, change said step 1 over to;
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if greater than, then said SDU is organized into new PDU, and behind interpolation group steamed stuffed bun head, change said step 1 over to; Otherwise change flow over to;
The method of group PDU in the described BWA wherein, in the said step 1, further comprises: the undressed SDU that will from formation, take out or will last time take out from formation is as said SDU.
The method of group PDU in the described BWA wherein, in the said step 1, further comprises: before obtaining said SDU, judge whether to exist the step of untreated SDU last time earlier, if exist, take out this SDU as said SDU; Otherwise from non-NULL SDU formation, take out new SDU; And whether length and MAC head length degree, the CRC length sum of judging the SDU that this is new be greater than the PDU maximum length; If greater than; Abandon this new SDU, from said non-NULL SDU formation, take out new SDU again, otherwise will this new SDU as said SDU.
The method of group PDU wherein, in the said step 1, further comprises: when not supporting to organize packet function, maximum said SDU are organized into a PDU, to organize the PDU processed steps in the described BWA.
The method of group PDU in the described BWA; Wherein, in the said step 1, when not supporting to organize packet function; Said group of PDU processed steps specifically comprises: judge that available bandwidth is whether greater than the length sum of said SDU, MAC head, expansion head, other son head, CRC; If greater than, then maximum said SDU being organized into a PDU, completion group PDU handles; Otherwise said SDU is set to the state of being untreated, and changes said flow over to.
The method of group PDU in the described BWA, wherein, said step 2 specifically comprises: add MAC head, sub-head to handling the PDU that obtains through group PDU, select to carry out the encryption of load or the step of additional CRC.
To achieve these goals, the present invention also provides the system of group PDU in a kind of BWA, comprising:
The SDU acquisition module is used to obtain SDU;
First group of PDU module connects said SDU acquisition module, is used for not supporting burst, during support group packet function, during support group packet function, one or more said SDU organized into a PDU, judges whether the existing PDU of continuous group,
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if less than, said SDU then is set be the state of being untreated, driving PDU package module; If greater than, whether the length sum of then judging former PDU, said SDU, group steamed stuffed bun head again is greater than the PDU maximum length; If the length sum is greater than the PDU maximum length, then said former PDU can not hold said SDU again, and said SDU is set to the state of being untreated, and drives the PDU package module; Otherwise said SDU is organized into said former PDU, and in first group of PDU module of interpolation group steamed stuffed bun head rear drive;
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if greater than, then said SDU is organized into new PDU, and in first group of PDU module of interpolation group steamed stuffed bun head rear drive; Otherwise change flow over to;
Second group of PDU module connects said SDU acquisition module and said PDU package module, is used for not supporting burst; When not supporting to organize packet function; Maximum said SDU are organized into a PDU, judge available bandwidth whether greater than the length sum of said SDU, MAC head, expansion head, other son head, CRC, if greater than; Then maximum said SDU are organized into a PDU, completion group PDU handles; Otherwise said SDU is set to the state of being untreated, and changes flow over to;
The PDU package module connects said first group of PDU module, be used for handling the PDU that obtains through group PDU and encapsulate, and the PDU that will obtain after will encapsulating gives the flow processing.
Useful technique effect of the present invention:
Compared with prior art; The present invention does not use and organizes the PDU method under the burst situation; The complexity of this method is much littler than the support burst situation of existing 802.16 agreements; And this method realizes easily and the time of effectively minimizing group PDU, and this is extremely important for the base station BS with very strong time limit requirement.
In addition, when the bandwidth of getting when this connection was organized minimum PDU inadequately, this connected this group PDU and finishes, thereby the bandwidth of deficiency is given other connections, has improved bandwidth availability ratio like this, has also solved the abnormal problem of IEEE802.16 situation simultaneously.
The present invention not burst group PDU method has also considered a PDU maximum length (IEEE802.16 is 2047Byte).
Describe the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
Description of drawings
Fig. 1 is the system construction drawing of of the present invention group of PDU;
Fig. 2 is the method flow diagram of of the present invention group of PDU;
Fig. 3 is the method flow diagram that the present invention obtains SDU;
Fig. 4 is total method flow diagram that the present invention does not support burst group PDU.
Embodiment
Below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is made further more detailed description.
As shown in Figure 1, be the system construction drawing of of the present invention group of PDU; This system 100 comprises: SDU acquisition module 10, first group of PDU module 20, second group of PDU module 30, PDU package module 40;
SDU acquisition module 10 is used to obtain the SDU module, from formation, takes out perhaps and takes out but untreated SDU from formation last time, and wherein, SDU is the load of IP bag.
First group of PDU module 20 connects SDU acquisition module 10, is used for the SDU that obtains from SDU acquisition module 10 is not being supported burst, handles but organize PDU under the support group bag situation;
Second group of PDU module 30 connects SDU acquisition module 10, and the SDU that obtains from SDU acquisition module 10 is not being supported burst, also do not support to organize and organizes the PDU processing under the bag situation;
PDU package module 40 connects second group of PDU module 20, second group of PDU module 30, is used to accomplish the encryption of PDU load, and complete PDU is formed in the interpolation of MAC head, son head, CRC at last.
As shown in Figure 2, be the method flow diagram of of the present invention group of PDU, in conjunction with Fig. 1, this figure has provided in the method for not supporting group PDU under the burst situation, specifically comprises the steps:
Step 200, beginning;
Step 201 is taken out from formation or took out but untreated SDU from formation last time through SDU acquisition module 10;
In this step, setting the IEEE802.16 maximum length is 2047, if SDU length, MAC head length degree, the CRC length summation of being taken out have exceeded PDU length, then abandons this SDU, obtains SDU more again;
Step 202 judges whether support group packet function, if support group packet function, then execution in step 203, otherwise execution in step 204;
Step 203 gets into and does not support burst, but the step of group PDU under the support group packet function situation is organized one or more SDU into PDU by first group of PDU module 20, and changed step 205 over to;
Step 204 gets into and does not support burst, does not support to organize the step of group PDU under the packet function situation, by second group of PDU module 30 maximum SDU is organized into a PDU, and changes step 205 over to;
Step 205 gets into the PDU encapsulation, adds MAC head, sub-head by PDU package module 40, and flow processs such as the encryption of completion PDU load, the additional CRC of calculating are formed complete PDU, and execution in step 206 then;
Step 206 is given the flow processing with forming complete PDU.
As shown in Figure 3, be the method flow diagram that the present invention obtains SDU, in conjunction with Fig. 1, the step of this flow process is following:
Step 304 is judged SDU length, MAC head length degree, CRC length sum, and promptly whether " SDU length+MAC head length degree+CRC length " greater than the PDU maximum length, if greater than, then change step 305 over to, otherwise change step 306 over to;
As shown in Figure 4, be total method flow diagram that the present invention does not support burst group PDU.In conjunction with Fig. 1, as follows to the process narration of the time group PDU that do not support burst:
For not supporting burst, do not support to organize the flow process of organizing PDU under the packet function situation by the flow process of label (1) beginning yet;
For not supporting burst, but organize the flow process of PDU under the support group packet function situation by the flow process of label (2) beginning;
Flow process by label (3) beginning is the flow process of PDU encapsulation;
Step 400 is obtained SDU through SDU acquisition module 10;
Step 401 with the input of the SDU that obtains as group PDU, judges whether support group bag, if do not support the group bag, then changes step 402 over to, otherwise changes step 405 over to;
Step 402 judges that available bandwidth whether greater than SDU, MAC head, expansion head, other son head, CRC length summation, if available bandwidth is enough big, then changes step 403 over to, otherwise execution in step 404;
Step 403 organizes this SDU into PDU, and execution in step 413 is accomplished the PDU encapsulation work then.At burst not, do not organize under the bag situation, a PDU at most only can organize into a SDU;
Step 404 is provided with this SDU and is the state of being untreated, and changes step 421 over to;
In this step, this state of being untreated is that this is the problem of the present invention's solution just, therefore also no longer includes the follow-up first-class flow process of encapsulation MAC here by the minimum PDU of the not enough group of available bandwidth.IEEE802.16 does not consider this kind situation, organizes the PDU flow process so and will be absorbed in abnormality;
Step 405 judges whether the existing PDU of continuous group, if continuous group then changes step 410 over to, otherwise changes step 406 over to; According to whether the PDU that has not organized was arranged last time, just the PDU of last time might have group to go into the ability of new SDU again;
Step 406 judges that available bandwidth whether greater than SDU, MAC head, group steamed stuffed bun head, other son head, the long total length of CRC, if available bandwidth can meet the demands, then changes step 407 over to, otherwise changes step 421 over to;
In this step, changing step 421 over to also is to consider the minimum PDU of the not enough group of remaining bandwidth, does not so just organize this PDU, can leave this part bandwidth for other and connect, and when having solved the abnormality processing flow process of agreement, improves bandwidth availability ratio;
Step 407 organizes SDU into new PDU, and execution in step 408 then;
In this step; Need not consider that SDU adds the situation of the first-class basic expense of MAC greater than the PDU maximum length; Because this step when obtaining the SDU module, has been abandoned the big SDU that possibly cause this situation for setting up new PDU (also there be not SDU in the PDU load) simultaneously;
Step 408, interpolation group steamed stuffed bun head obtains new SDU through SDU acquisition module 10, and execution in step 401 then;
Step 409 is provided with SDU and is the state of being untreated, and preserves first BSN (Block Sequence Number, piece sequence number) among the SDU, changes step 413 over to;
In this step, the state of being untreated possibly caused by two kinds of factors, and one of which is an insufficient bandwidth, is that bandwidth is enough in addition, but the last space of PDU of continuous group can not hold this SDU;
Step 410 is judged available bandwidth whether greater than the total length of SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if available bandwidth is enough big, then execution in step 411, otherwise change step 409 over to;
Whether step 411 judges former PDU, SDU, group steamed stuffed bun head length degree summation greater than PDU maximum length (IEEE802.16 is 2047), if greater than, explain that then this PDU can not hold new SDU again, accomplishes the follow-up encapsulation work of this PDU, execution in step 409; Otherwise change step 412 over to;
Step 412 is gone among the former PDU execution in step 408 with the continuous group of SDU;
Step 413 is added other sub-head, changes step 414 over to;
Step 414 need to judge whether to encrypt, if need, then execution in step 415, otherwise change step 416 over to;
Step 415 is accomplished the encryption to load (Payload), does not contain the encryption to CRC here, and execution in step 416 then;
Step 416 need to judge whether additional CRC, if need, then changes step 417 over to, otherwise execution in step 418;
Step 417 is calculated CRC, and CRC comprises MAC head and load thereof, then CRC is appended to the tail end of load;
Step 418 is added the MAC head, execution in step 419;
Step 419, the PDU that group is good is connected among the upstream or downstream Burst, and execution in step 420 then;
Step 420 judges whether available bandwidth in addition, if do not have, then changes step 421 over to; Otherwise execution in step 400 is obtained new SDU through SDU acquisition module 10, and execution in step 401 then;
Step 421 is handled the PDU that exports by flow.
The present invention is directed to and do not support the burst situation to propose a kind of method of SDU being formed MAC PDU; Wherein SDU is the load of IP bag; This method solves and does not support group PDU problem under the burst situation in the IEEE802.16 agreement; Consider the maximum length factor of a PDU simultaneously, also solved the handling problem of when remaining bandwidth is not enough, organizing minimum PDU situation.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. the method for group PDU in the BWA is characterized in that, comprising:
Step 1 is obtained SDU, and is not supporting burst, and during support group packet function, one or more said SDU is organized into a PDU, judges whether the existing PDU of continuous group,
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if less than, said SDU then is set is the state of being untreated, change said step 2 over to; If greater than, whether the length sum of then judging former PDU, said SDU, group steamed stuffed bun head again is greater than the PDU maximum length; If the length sum is greater than the PDU maximum length, then said former PDU can not hold said SDU again, and said SDU is set to the state of being untreated, and changes said step 2 over to; Otherwise said SDU is organized into said former PDU, and behind interpolation group steamed stuffed bun head, change said step 1 over to;
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if greater than, then said SDU is organized into new PDU, and behind interpolation group steamed stuffed bun head, change said step 1 over to; Otherwise change flow over to;
Step 2 encapsulate handling the PDU that obtains through group PDU, and the PDU that will obtain after will encapsulating is given the flow processing.
2. the method for group PDU in the BWA according to claim 1; It is characterized in that; In the said step 1, further comprise: mode of from formation, taking out or the undressed SDU that will take out from formation last time obtain the step of said SDU as the mode of said SDU.
3. the method for group PDU is characterized in that, in the said step 1 in the BWA according to claim 1; Further comprise: before obtaining said SDU; Judge whether to exist the step of untreated SDU last time earlier,, take out this SDU as said SDU if exist; Otherwise from non-NULL SDU formation, take out new SDU; And whether length and MAC head length degree, the CRC length sum of judging the SDU that this is new be greater than the PDU maximum length; If greater than; Abandon this new SDU, from said non-NULL SDU formation, take out new SDU again, otherwise will this new SDU as said SDU.
4. according to the method for organizing PDU in claim 1, the 2 or 3 described BWAs; It is characterized in that, in the said step 1, further comprise: when not supporting to organize packet function; Maximum said SDU are organized into a PDU, to organize the PDU processed steps.
5. the method for group PDU in the BWA according to claim 4; It is characterized in that; In the said step 1, said group of PDU processed steps specifically comprises: judge available bandwidth whether greater than the length sum of said SDU, MAC head, expansion head, other son head, CRC, if greater than; Then maximum said SDU are organized into a PDU, completion group PDU handles; Otherwise said SDU is set to the state of being untreated, and changes said flow over to.
6. according to the method for organizing PDU in claim 1, the 2 or 3 described BWAs; It is characterized in that; Said step 2 specifically comprises: add MAC head, sub-head to handling the PDU that obtains through group PDU, select to carry out the encryption of load or the step of additional CRC.
7. the system of group PDU in the BWA is characterized in that, comprising:
The SDU acquisition module is used to obtain SDU;
First group of PDU module connects said SDU acquisition module, is used for not supporting burst, during support group packet function, one or more said SDU organized into a PDU, judges whether the existing PDU of continuous group,
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if less than, said SDU then is set be the state of being untreated, triggering PDU package module; If greater than, whether the length sum of then judging former PDU, said SDU, group steamed stuffed bun head again is greater than the PDU maximum length; If the length sum is greater than the PDU maximum length, then said former PDU can not hold said SDU again, and said SDU is set to the state of being untreated, and triggers the PDU package module; Otherwise said SDU is organized into said former PDU, and behind interpolation group steamed stuffed bun head, trigger said first group of PDU module;
If continuous group, further judge available bandwidth whether greater than the length sum of said SDU, MAC head, group steamed stuffed bun head, other son head, CRC, if greater than, then said SDU is organized into new PDU, and behind interpolation group steamed stuffed bun head, trigger said first group of PDU module; Otherwise change flow over to;
Second group of PDU module connects said SDU acquisition module and said PDU package module, is used for not supporting burst; When not supporting to organize packet function; Maximum said SDU are organized into a PDU, judge available bandwidth whether greater than the length sum of said SDU, MAC head, expansion head, other son head, CRC, if greater than; Then maximum said SDU are organized into a PDU, completion group PDU handles; Otherwise said SDU is set to the state of being untreated, and changes flow over to;
The PDU package module connects said first group of PDU module, be used for handling the PDU that obtains through group PDU and encapsulate, and the PDU that will obtain after will encapsulating gives the flow processing.
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| CN103517335B (en) * | 2013-09-18 | 2016-06-15 | 北京创毅讯联科技股份有限公司 | Data group bag method and apparatus |
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| CN1780291A (en) * | 2004-11-19 | 2006-05-31 | 华为技术有限公司 | Data segment cascade and recombinant method |
| CN1898912A (en) * | 2004-09-10 | 2007-01-17 | 三菱电机株式会社 | Method and system for aggregating frames to be transmitted over channel in wireless network |
| CN1921346A (en) * | 2005-08-24 | 2007-02-28 | 华为技术有限公司 | Data segmentation cascade transmitting method |
| CN1964314A (en) * | 2005-11-07 | 2007-05-16 | 华为技术有限公司 | A method to transmit IP message by high speed downlink packet access technology of HSDPA |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1898912A (en) * | 2004-09-10 | 2007-01-17 | 三菱电机株式会社 | Method and system for aggregating frames to be transmitted over channel in wireless network |
| CN1780291A (en) * | 2004-11-19 | 2006-05-31 | 华为技术有限公司 | Data segment cascade and recombinant method |
| CN1921346A (en) * | 2005-08-24 | 2007-02-28 | 华为技术有限公司 | Data segmentation cascade transmitting method |
| CN1964314A (en) * | 2005-11-07 | 2007-05-16 | 华为技术有限公司 | A method to transmit IP message by high speed downlink packet access technology of HSDPA |
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