CN101742557A - Device and method for parsing protocol data unit - Google Patents
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- CN101742557A CN101742557A CN200910205926A CN200910205926A CN101742557A CN 101742557 A CN101742557 A CN 101742557A CN 200910205926 A CN200910205926 A CN 200910205926A CN 200910205926 A CN200910205926 A CN 200910205926A CN 101742557 A CN101742557 A CN 101742557A
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Abstract
The invention provides a device and a method for parsing a protocol data unit. The method comprises the following step that when a protocol data unit(PDU) parsing device parses the PDUs in the data burst, if head check sequence (HCS) checks of the two consecutive PDUs are wrong, the HCS identification is used for identifying the following available data in the data burst. By the adoption of the technical scheme, when the PDUs are wrongly parsed in the data burst, the following PDUs in the data burst can be parsed as correctly as possible, and the packet loss rate is lowered.
Description
Technical field
The present invention relates to wireless communication system, relate in particular to a kind of device and method of parsing protocol data unit.
Background technology
As a kind of emerging wireless access wide band technology, WiMAX (global microwave access intercommunication technology) has been subjected to the common concern of industry in recent years.Its major technique characteristics be transmission rate height, coverage big, support mobility, provide QoS to guarantee and adopt the network architecture based on all-IP, realized packetization, access bandization and terminal mobile three unification, be with a wide range of applications.
IEEE802.16 is an air interface protocol of supporting that high-speed radio inserts, has defined the physical layer and medium access control (MAC) the layer standard of WiMAX system.In the WiMAX system, data are placed on that frame sends in up-downgoing, and the data in the frame are the unit transmission with Burst (data burst), and Burst adjusts the coded data block unit together.The size of Burst is dynamically to change, and each MS can only have a Burst under the pattern of non-HARQ in a sub-frame of uplink, and the PDU that is to say a plurality of connections of a MS can be placed among the Burst and send.And in descending sub frame; in order to reduce expense; usually can be placed on a Burst to the PDU of the modulation coding mode different MS identical with Boosting and number of repetition sends; no matter can comprise PDU of different nature, so higher requirement is arranged for the algorithm that in Burst, solves PDU for a up or descending Burst.Because Burst is an encoding block, not with other extra information, when separating Burst, begin to separate from first PDU, have only the length information that correctly solves previous PDU just might correctly solve a back PDU, just in same Burst, be among the PDU in front if make mistakes, even the PDU of back is all correct, might separate to come out yet, can only abandon.
The MAC PDU form of IEEE802.16 definition is seen Fig. 1, by MAC Header, Payload and CRC (Cyclic Redundancy Check, cyclic redundancy check (CRC)) forms, whether CRC is used for the data that the receiving terminal verification received correct, coding is simple and probability of miscarriage of justice is very low, has obtained using widely in communication system.MAC PDU can not have Payload and CRC, and the length of Payload is unfixing, and length is indicated by the length field of MAC Header, and CRC length is 4 Byte.The form of MAC Header is asked for an interview Fig. 2, MAC Header can be with a plurality of sub-heads in the inside, so be random length, minimum length is 6 Byte, wherein length field accounts for 11 Bit, and HCS (Header Check Sequence, a verification sequence) accounts for 8 Bit, be exactly in fact 8 CRC check and, be used for the correctness of PDU MACHeader is carried out verification.Whether PDU has CRC is by being held consultation by BS and MS when connecting foundation, is essential band CRC's and manage connection.If the result of connection negotiation needs band CRC, all PDU of this connection need to be with CRC so, if the result who consults is not with CRC, the PDU on this connects so can not be with CRC.Because PDU CRC length is 4 Byte, expense is bigger for parcel, wraps less demanding business such as voice and video etc. for mistake, can not need to be with CRC.Whether a PDU is indicated by CI territory wherein with HCS.
For the PDU that CRC is arranged, CRC carries out verification to whole M AC PDU, comprise MAC Header, and HCS just carries out verification to MAC Header, and CRC check is 32 Bit, and HCS has only 8 Bit, and CRC has lower False Rate than HCS.So, if the HCS verification is but, CRC check certainly but, if CRC is but, HCS might pass through, because what error code occurs might be payload or CRC part.
The existing algorithm of in Burst, separating PDU, it generally all is front from Burst, a PDU of PDU separates, solve the MAC Header of PDU earlier, carry out the HCS verification then, the HCS verification by after again the data of back are handled, if the HCS verification only will abandon the data of this Burst back.By this algorithm, among the Burst, as long as middle have a PDU to make mistakes, all PDU of this Burst back will abandon, bandwidth of air-interface is precious resource for wireless communication system, if the correct data of having transmitted is not solved, is exactly to waste bandwidth of air-interface in fact.
Summary of the invention
The technical problem to be solved in the present invention provides the device and method of a kind of PDU of parsing, can realize correctly parsing as much as possible when the PDU parse error among the Burst subsequent P DU among this Burst, reduces packet loss.
In order to address the above problem, the invention provides a kind of method of parsing protocol data unit, comprise: when the PDU that protocol Data Unit (PDU) resolver happens suddenly to data resolves, if the equal mistake of a verification sequence (HCS) verification of continuous two PDU then adopts HCS to discern and identifies follow-up data available in the described data burst.
Further, described employing HCS discerns the data available that identifies in the follow-up data burst and is meant,
If individual the reaching of the N of described data burst all made mistakes when N+1 PDU carries out the HCS verification, the address of the next byte of the MAC Header of described N PDU is designated as N, the last address of described data burst is designated as M, is that the data of n are carried out the HCS verification successively to address N to all length between the M of address; If occur the HCS verification succeeds then the data of this section H CS verification succeeds can use, all wrong then follow-up data of described data burst in back does not have data available if the HCS verification finishes;
Described 6≤n≤M-N.
Further, described employing HCS discerns the data available that identifies in the follow-up data burst and is meant,
If the N of described data burst and N+1 PDU all resolve and make mistakes, then remaining each PDU is all carried out the HCS verification since N+2 PDU, if N+i PDU carries out the HCS verification succeeds, then described N+i PDU is data available, if the equal check errors of remaining each PDU then the follow-up data of described data burst do not have data available;
When remaining each PDU was carried out the HCS verification, the first address of each PDU was known according to the length field of previous PDU.
Further, when having data available in the follow-up data that identifies described data burst, this data available is carried out dissection process as the MAC Header of current PDU.
Further, described method is applicable to the global microwave access intercommunication technological system.
The present invention also provides a kind of device of parsing protocol data unit, comprises protocol Data Unit (PDU) parsing module, cache module;
Described cache module is used to store the data of the data burst of reception;
Described PDU parsing module is used for reading PDU from described cache module, and described PDU is carried out dissection process, also is used for identifying follow-up data available in the described data burst when a verification sequence (HCS) verification of continuous two PDU is all wrong.
Further, described PDU parsing module identifies that follow-up data available is meant in the described data burst,
If individual the reaching of the N of described data burst all made mistakes when N+1 PDU carries out the HCS verification, the address of the next byte of the MAC Header of described N PDU is designated as N, the last address of described data burst is designated as M, and the PDU parsing module is that the data of n are carried out the HCS verification successively to address N to all length between the M of address; If occur the HCS verification succeeds then the data of this section H CS verification succeeds can use, all wrong then follow-up data of described data burst in back does not have data available if the HCS verification finishes;
Described 6≤n≤M-N.
Further, described PDU parsing module identifies that follow-up data available is meant in the described data burst,
If the N of described data burst and N+1 PDU all resolve and make mistakes, the PDU parsing module carries out the HCS verification since N+2 PDU to remaining each PDU, if HCS verification succeeds to N+i PDU, then described N+i PDU is data available, if the equal check errors of remaining each PDU then the follow-up data of described data burst do not have data available;
When remaining each PDU was carried out the HCS verification, the PDU parsing module was a first address of knowing next PDU according to the length field of previous PDU.
Further, after described PDU parsing module also is used for identifying the data available of described data burst, this data available is carried out dissection process as the MAC Header of current PDU.
Further, described device is applicable to the global microwave access intercommunication technological system.
In sum, the present invention proposes the device and method of a kind of PDU of parsing, can reduce and handle complexity and by the HCS error correction, reduce the packet loss that produces owing to error code, and the correct PDU in the wrong back of PDU of front can correctly be solved in a Burst, reduces packet loss.The present invention is particularly useful for the Wimax BWA.
Description of drawings
Fig. 1 is a MAC PDU form;
Fig. 2 is general MAC Header form;
Fig. 3 is the structural representation of apparatus of the present invention;
Fig. 4 is the flow chart that the present invention handles the PDU of band CRC;
Fig. 5 is the flow chart that the present invention handles the PDU that is not with CRC;
Fig. 6 is the flow chart of the concrete enforcement of HCS matching method proposed by the invention;
Fig. 7 is the flow chart of the concrete enforcement of HCS trial-and-error method proposed by the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention being used for the device that the WiMAX system separates PDU describes.
Present embodiment provides the device of a kind of PDU of parsing, as shown in Figure 3, comprises wireless receiving module, PDU parsing module, cache module, correction module and PDU receiving and counting module;
Wireless receiving module is used for from the receiving data frames of eating dishes without rice or wine, and the Frame that receives is sent to cache module;
In the Wimax system, be exactly descending sub frame for MS, be exactly sub-frame of uplink for BS;
Cache module is used to store the Burst data from eating dishes without rice or wine to receive;
The PDU parsing module is used for reading PDU from cache module, and PDU is carried out dissection process, also is used for identifying follow-up data available among this Burst when the HCS of continuous two PDU verification is all wrong.
The PDU parsing module can but be not limited to adopt following dual mode that follow-up data among the Burst is discerned:
(1) if individual the reaching of the N of Burst all made mistakes when N+1 PDU carries out the HCS verification, the address of the next byte of the MAC Header of N PDU is designated as N, the last address of this Burst is designated as M, and the PDU parsing module is that the data of n are carried out the HCS verification successively to address N to all length between the M of address; If occur the HCS verification succeeds then the data of this section H CS verification succeeds can use, all wrong then follow-up data of this Burst in back does not have data available if the HCS verification finishes;
Described 6≤n≤M-N.
(2) if the N of Burst and N+1 PDU all resolve and make mistakes, the PDU parsing module carries out the HCS verification since N+2 PDU to remaining each PDU, if HCS verification succeeds to N+i PDU, then this N+i PDU is data available, if the equal check errors of remaining each PDU then the follow-up data of this Burst do not have data available;
When remaining each PDU was carried out the HCS verification, the PDU parsing module was a first address of knowing next PDU according to the length field of previous PDU.
The PDU parsing module also is used for notifying when certain PDU is carried out the HCS check errors HCS correction module that this PDU MAC Header is carried out correction process, and reception error correction result, the PDU parsing module carries out dissection process to the follow-up PDU of this Burst when the error correction success, if the unsuccessful then PDU parsing module of the HCS check errors of continuous two PDU and error correction carries out HCS identification to follow-up data.
After the PDU parsing module also is used for identifying the data available of Burst, this data available is carried out dissection process as the MAC Header of current PDU.
The PDU parsing module also is used for notice PDU receiving and counting module when correctly solving PDU, and notifies PDU receiving and counting module when CRC check mistake, HCS check errors.
PDU is carried out dissection process herein and comprise the operation that PDU is carried out CRC check, HCS verification and separates PDU;
The HCS correction module is used for when the PDU parsing module carries out the HCS check errors to PDU this PDU MAC Header being carried out error correction, and the error correction result is sent to the PDU parsing module;
The HCS verification is not out-of-date, and PDU MAC Header is carried out error correction, can only correct the mistake of some situation;
PDU receiving and counting module is used for counting the PDU number that Burst correctly solves, the PDU number of CRC check mistake, the PDU number of HCS check errors.
Present embodiment provides the method for a kind of PDU of parsing, has three kinds of situations when resolving PDU from Burst:
(a) the MAC Header of N PDU is correctly solved, and can solve N+1 PDU according to the Length territory of N PDU;
(b) the MAC Header of N PDU is wrong, be HCS verification only (still wrong after the HCS error correction), but the Length territory still effectively, can find out the correct position of next PDU by the Length territory, this is to verify by the HCS verification of the MAC Header of N+1 PDU, if the MAC Header of N+1 PDU can pass through the HCS verification, be effectively with regard to the Length that N PDU is described, the same situation of follow-up processing (a);
(c) this situation is relative with situation (b), and the MAC Header that is exactly N PDU is wrong, i.e. HCS verification is (still wrong after the HCS error correction) only, and the Length territory of N PDU is invalid.In order to seek follow-up data available, can by the HCS verification and feature seek, at situation (c), the following examples have been introduced two kinds of methods: HCS matching method and HCS trial-and-error method.
The present invention is used for the Wimax system, and to separate the concrete implementation step of PDU method as follows:
Below be processing to the PDU of band CRC, as shown in Figure 4:
Step 101: from the receiving data frames of eating dishes without rice or wine, and the Burst in the preservation Frame.Below for quoting 1.
Step 102: check whether the current PDU among the Burst has CRC, and current PDU is the current PDU that is handling, and is then to change step 103 over to, quotes 2 otherwise change over to.
Step 103: current PDU is carried out CRC check.
Step 104: judge whether CRC check is passed through, and is then to change step 105 over to, otherwise change step 106 over to.
Step 105: separate current PDU, and change step 109 over to.
Step 106: current PDU is carried out the HCS verification.
Step 107: judge whether the HCS verification is passed through, and is then to change step 108 over to, otherwise change step 110 over to.
Step 108: separate current PDU MAC Header, change step 109 afterwards over to;
Step 109: judging whether to also have next PDU, is then to change next PDU over to, and execution in step 102, otherwise changes step 114 over to.
Step 110: current PDU MAC Header is carried out error correction, change step 111 afterwards over to.
Step 111: judge that whether error correction is successful, is then to change step 112 over to, otherwise changes step 113 over to;
Step 112: the current PDU after the error correction is carried out CRC check, change step 104 afterwards over to;
Step 113: judge whether double HCS check errors, be then to change over to quote 3 and adopt the HCS recognition methodss to discern data available in this Burst follow-up data, otherwise change step 109 over to;
Step 114: judge whether to also have next Burst, be then to change over to quote 1, otherwise change step 115 over to.
Step 115: add up the PDU that this frame is handled, flow process finishes.
Below be the processing of not being with CRC PDU, as shown in Figure 5:
Enter following flow process from quoting 2, following flow process all is to implement by separating PDU module 103.
Step 201: current PDU is carried out the HCS verification.
Step 202: judge whether the HCS verification is passed through, and is then to change step 203 over to, otherwise change step 204 over to.
Step 203: separate current PDU, and change step 206 over to.
Step 204: current PDU MAC Header is carried out error correction.
Step 205: judge that whether error correction is successful, is then to change step 203 over to, otherwise changes step 209 over to;
Step 206: judge whether to also have next PDU, be then to change next PDU over to, and return and quote 1, otherwise change step 207 over to.
Step 207: judge whether to also have next Burst, be then to change over to quote 1, otherwise change step 208 over to.
Step 208: add up the PDU that this frame is handled, flow process finishes.
Step 209: judge whether double HCS check errors, be then to change over to quote 3 and adopt the HCS recognition methodss to discern data available in this Burst follow-up data, otherwise change step 206 over to;
Below introduce two kinds of HCS recognition methodss and discern data available in this Burst follow-up data;
(1) HCS matching method: since HCS be the initial data of PDU MAC Header by certain algorithm, obtain new data, and these new data and former data have intrinsic internal relation.By former data and new data set are lumped together, form new data, so this new data has the ability of self-verification, and if this new data correctly transmitted, calculate verification and be zero at receiving terminal.According to these characteristics, can in the third situation, find out effective PDU MACHeader data, carry out the HCS coupling exactly, 6 Byte or above data are carried out HCS verification and computing, if verification is by just illustrating that these data might be correct PDU MACHeader.
The HCS matching method is meant, if individual the reaching of the N of Burst all made mistakes when N+1 PDU carries out the HCS verification, the address of the next byte of the MAC Header of N PDU is designated as N, the last address of this Burst is designated as M, is that the data of n are carried out the HCS verification successively to address N to all length between the M of address; If the HCS verification succeeds occurring then can use the data of this section H CS verification succeeds, all wrong then follow-up data of this Burst in back does not have data available if the HCS verification finishes; Described 6≤n≤M-N.
Its concrete implementation step is as shown in Figure 6:
Enter the back and adopt the flow process of HCS matching method as described below from quoting 3;
Step 301: the PDU of double HCS check errors is designated as PDU N and PDU N+1, with the next byte of the MAC Header of N PDU as the first address that carries out the HCS recognition data.
Step 302: first address is added the last address of 6 bytes (minimum length of MAC Header) as the data of carrying out the HCS verification.
Step 303: whether the last address of judging the data carry out the HCS verification is then to change step 307 over to, otherwise changes step 304 over to greater than the last address of Burst.
Step 304: the data between first address and the last address are done the HCS verification.
Step 305: judge whether the HCS verification is wrong, is then to change step 306 over to, otherwise change step 309 over to;
Step 306: the last address that will do the data of HCS verification adds 1, changes step 303 then over to.
Step 307: the first address that will do the data of HCS verification adds 1.
Step 308: whether first address subtracts 6 greater than the last address of Burst, is then to withdraw from, otherwise changes step 302 over to.
Step 309:, change over to afterwards and quote 1 with the MACHeader of the valid data between first address and the last address as current PDU.
(2) HCS trial-and-error method: the HCS matching method can find all correct PDU MAC Header, but when wrong PDU was longer, HCS verification and the operation times of searching the effective PDU MAC Header among the residue Burst behind this wrong PDU by the HCS matching method may be a lot.Because the minimum length of PDUMAC Header is 6Byte, the length in Length territory is 11bit, when also just saying the HCS mistake, the Length error probability is 23% to the maximum, that is to say that the Length territory just might be wrong, down separate PDU according to this Length territory and still might solve correct PDU MAC Header, the HCS trial-and-error method is exactly to search correct PDU MAC Header by this thinking, find all correct PDU MAC Header surely though this algorithm differs, complexity reduces greatly.
The HCS trial-and-error method is meant, if the N of Burst and N+1 PDU all resolve and make mistakes, then remaining each PDU is all carried out the HCS verification since N+2 PDU, if N+i PDU carries out the HCS verification succeeds, then this N+i PDU is data available, if the equal check errors of remaining each PDU then the follow-up data of this Burst do not have data available; When remaining each PDU was carried out the HCS verification, the first address of each PDU was known according to the length field of previous PDU.
Its concrete implementation step is as shown in Figure 7:
Enter the back and adopt the flow process of HCS trial-and-error method as described below from quoting 3;
The PDU of double HCS check errors is designated as PDU N and PDU N+1;
Step 401: the length territory of getting the MAC Header of N+1 PDU calculates the first address of next PDU, the i.e. first address of N+2 PDU.
Step 402: whether the first address of judging PDU N+2 is then to withdraw from, otherwise changes step 403 over to greater than the last address of Burst.
Step 403: PDU N+2 is carried out the HCS verification.
Step 404: judge whether the HCS verification is wrong, is then to change step 405 over to, otherwise change step 406 over to;
Step 405:N value adds 1, changes step 401 afterwards over to;
Step 406:, change over to afterwards and quote 1 with the MACHeader of the valid data between first address and the last address as current PDU.
Claims (10)
1. the method for a parsing protocol data unit, comprise: when the PDU that protocol Data Unit (PDU) resolver happens suddenly to data resolves, if the equal mistake of a verification sequence (HCS) verification of continuous two PDU then adopts HCS to discern and identifies follow-up data available in the described data burst.
2. the method for claim 1 is characterized in that:
Described employing HCS discerns the data available that identifies in the follow-up data burst and is meant,
If individual the reaching of the N of described data burst all made mistakes when N+1 PDU carries out the HCS verification, the address of the next byte of the MAC Header of described N PDU is designated as N, the last address of described data burst is designated as M, is that the data of n are carried out the HCS verification successively to address N to all length between the M of address; If occur the HCS verification succeeds then the data of this section H CS verification succeeds can use, all wrong then follow-up data of described data burst in back does not have data available if the HCS verification finishes;
Described 6≤n≤M-N.
3. the method for claim 1 is characterized in that:
Described employing HCS discerns the data available that identifies in the follow-up data burst and is meant,
If the N of described data burst and N+1 PDU all resolve and make mistakes, then remaining each PDU is all carried out the HCS verification since N+2 PDU, if N+i PDU carries out the HCS verification succeeds, then described N+i PDU is data available, if the equal check errors of remaining each PDU then the follow-up data of described data burst do not have data available;
When remaining each PDU was carried out the HCS verification, the first address of each PDU was known according to the length field of previous PDU.
4. as claim 2 or 3 described methods, it is characterized in that:
When having data available in the follow-up data that identifies described data burst, this data available is carried out dissection process as the MAC Header of current PDU.
5. the method for claim 1 is characterized in that:
Described method is applicable to the global microwave access intercommunication technological system.
6. the device of a parsing protocol data unit comprises protocol Data Unit (PDU) parsing module, cache module; It is characterized in that:
Described cache module is used to store the data of the data burst of reception;
Described PDU parsing module is used for reading PDU from described cache module, and described PDU is carried out dissection process, also is used for identifying follow-up data available in the described data burst when a verification sequence (HCS) verification of continuous two PDU is all wrong.
7. device as claimed in claim 6 is characterized in that:
Described PDU parsing module identifies that follow-up data available is meant in the described data burst,
If individual the reaching of the N of described data burst all made mistakes when N+1 PDU carries out the HCS verification, the address of the next byte of the MAC Header of described N PDU is designated as N, the last address of described data burst is designated as M, and the PDU parsing module is that the data of n are carried out the HCS verification successively to address N to all length between the M of address; If occur the HCS verification succeeds then the data of this section H CS verification succeeds can use, all wrong then follow-up data of described data burst in back does not have data available if the HCS verification finishes;
Described 6≤n≤M-N.
8. device as claimed in claim 6 is characterized in that:
Described PDU parsing module identifies that follow-up data available is meant in the described data burst,
If the N of described data burst and N+1 PDU all resolve and make mistakes, the PDU parsing module carries out the HCS verification since N+2 PDU to remaining each PDU, if HCS verification succeeds to N+i PDU, then described N+i PDU is data available, if the equal check errors of remaining each PDU then the follow-up data of described data burst do not have data available;
When remaining each PDU was carried out the HCS verification, the PDU parsing module was a first address of knowing next PDU according to the length field of previous PDU.
9. as claim 7 or 8 described devices, it is characterized in that:
After described PDU parsing module also is used for identifying the data available of described data burst, this data available is carried out dissection process as the MAC Header of current PDU.
10. device as claimed in claim 7 is characterized in that:
Described device is applicable to the global microwave access intercommunication technological system.
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| WO2011160369A1 (en) * | 2010-06-23 | 2011-12-29 | 中兴通讯股份有限公司 | Method and device for handling data burst error |
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Application publication date: 20100616 |