CN108650690A - A kind of packet error detection method and error detector element based on generation domain - Google Patents
A kind of packet error detection method and error detector element based on generation domain Download PDFInfo
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- CN108650690A CN108650690A CN201810327421.3A CN201810327421A CN108650690A CN 108650690 A CN108650690 A CN 108650690A CN 201810327421 A CN201810327421 A CN 201810327421A CN 108650690 A CN108650690 A CN 108650690A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The invention discloses a kind of based on the packet error detection method and error detector element that generate domain.The packet error detection method include transmission before before and after data packet region is inserted into generate domain block, and positioned at forefoot area generations domain block insertion position be located on rear region generation domain block insertion position it is symmetrical, formed previous existence at domain block and afterwards generation domain block；The data packet inserted with generation domain block is received, and detects previous existence into the average error rate of domain block and the rear average error rate for generating domain；According to the forward and backward average error rate for generating domain and the front and back average error rate bit difference value for generating domain than determining packet error type.In the data of transmission, domain is generated by being inserted into data to be transmitted, receive transmission data, and detect average error rate and the front and back bit difference value ratio for generating average error rate in the block of domain in forward and backward generation domain block, type of error in data transmission procedure is determined according to the two amounts, realizes the judgement of type of error.
Description
Technical field
The present invention relates to the detection technique fields of wireless sensor network data error of transmission, more particularly, to one kind
Based on the packet error detection method and error detector element for generating domain.
Background technology
Wireless sensor network has application in Military Application, environment measuring, health medical treatment, the smart city fields Deng Ge.
But the performance of network is easy to be influenced by transmission environment, leads to data packet transmission failure.The reason of causing this phenomenon is main
It is divided into two classes:The non conflicting mistake of physical layer and the collision error of MAC layer.Non conflicting mistake is in non conflicting scene
Lower generation, including path loss, multipath fading, shadow fading and IEEE 802.11 are interfered, and the erroneous packets under these scenes are even
It is hair, non-continuous.Collision error generates under the scene that conflicts, and is mainly derived from concealed terminal, and the conflict under this scene is wrong
Accidentally once generating, easily causes persistent collisions, extreme influence is caused to network performance.
The bottom of wireless sensor node is based on IEEE802.15.4 standards and builds on the market at present, the standard use with
Machine contention access mode Carrier Sense Multiple Access/conflict avoidance (CSMA/CA) mechanism.But CSMA/CA mechanism allows most
Big number of retransmissions is only 3 times, will be dropped more than data packet after this number.Due to the root for not having to solve to cause packet error
This reason, i.e. hidden terminal problem, follow-up data packet still can largely conflict.Existing testing mechanism uses statistical method, acquisition
Conflict is judged after multi-group data, node energy consumption is larger, and has delay.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, it is wrong based on the data packet for generating domain that the present invention provides a kind of
Error detection method and error detector element.Its object is to solve existing packet error detection method not determining wrong class
The technical issues of type.
To achieve the above object, the present invention provides a kind of packet error detection method based on generation domain, including as follows
Step：
Region is inserted into and generates domain block before and after data packet before S110 transmission, and is inserted into positioned at the generation domain block of forefoot area
The generation domain block insertion position that position is located on rear region is symmetrical, forms previous existence into domain block and rear generation domain block；Wherein, domain is generated
Block code known to known, content for position in the packet；
S120 received data packets, extract the generation domain block of insertion, and detect previous existence into the average error rate of domain block and rear life
At the average error rate in domain；
S130 was according to previous existence at the average error rate, the rear average error rate for generating domain and the front and back average mistake for generating domain in domain
Code check bit difference value is than determining packet error type.
Preferably, step S130 includes the following steps：
S131 judges whether previous existence at the average error rate Bal of domain block is 0, if so, entering step S133, otherwise, enters
Step S132；
Whether S132 generates domain block average error rate Bar after judging is flat less than generation domain block rear under non conflicting scene
The size of the maximum value Bar-MAX of the equal bit error rate, if so, entering step S135 if it is not, entering step S133；
S133 obtained bit difference value ratio according to previous existence at the average error rate of domain block and the rear average error rate for generating domain
BDR；
S134 by bit difference value ratio BDR under non conflicting scene bit difference value than maximum value BDRn-MAX and the field that conflicts
Under scape bit difference value than minimum value BDRc-MIN compare；
If bit difference value ratio BDR be less than under non conflicting scene bit difference value than maximum value BDRn-MAX, enter step
Rapid S135；
If bit difference value ratio BDR be more than conflict scene under bit difference value than minimum value BDRc-MIN, enter step
S136；
If bit difference value ratio BDR be under non conflicting scene bit difference value than maximum value BDRn-MAX and conflict scene
Lower bit difference value than minimum value BDRc-MIN between, then enter step S137；
S135 misjudgments are non conflicting mistake；
S136 misjudgments are collision error；
S137 type of errors can not judge.
Preferably, in step S133：
According to formulaObtain bit difference value ratio BDR；
Wherein, Bal is average error rate of the previous existence at domain block, and Bar generates the average error rate of domain block after being.
Preferably, in step S120：
According to formulaPrevious existence at domain block average error rate Bal, according to formulaIt obtains
The average error rate Bar of domain block is generated afterwards；
Wherein, BEL is error bit number of the previous existence at domain block, and BER generates the error bit number of domain block after being, BEA is complete
Portion generates the bit number of domain block.
Preferably, it is correct according to numeric field data length, permission transmitted data amount and false judgment is generated to be inserted into generation domain quantity
Rate determines.
As another aspect of the present invention, the present invention provides a kind of based on the packet error detection device for generating domain, packet
It includes：
Data reception module, for receiving in data forefoot area and rear region inserted with the data packet for generating domain block；
Data Post module, for detecting inserted with previous existence in the symmetrical data packet for generating domain block into domain block
Average error rate and the rear average error rate for generating domain；
False judgment module, for according to previous existence at the average error rate in domain, the rear average error rate for generating domain and front and back
The average error rate bit difference value in domain is generated than determining packet error type.
Preferably, packet error detection device further includes data pre-processing module and data transmission blocks；Before data
Reason module is used for the region before and after the data packet that do not transmit and is inserted into symmetrical generation domain block, and data transmission blocks are used for
It sends inserted with the data packet for generating domain block.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
1, the present invention is mainly used to detect wireless sensor network in the data transmission, the packet error of generation whether by
Conflict scene causes.If it is mistake caused by conflict scene to judge, illustrate that there may be concealed terminals at this, hide eventually
End can cause extreme influence to the reception of data packet.Therefore, it generates domain detection and may determine that error packet reason, to prompt sensor
Node changes receiving and dispatching mechanism, to improve network transmission performance.
2, packet error detection method provided by the invention, by being inserted into respectively pair in data front and rear part to be transmitted
The generation domain block for claiming distribution detects the average error rate inserted with previous existence in generation numeric field data at domain block and rear life by transmitting
At the average error rate of domain block, after there is collision error, it is later half to concentrate on data packet for the position of error bit under the scene that conflicts
Portion, and error bit is evenly distributed under non conflicting scene so that the bit error rate under non conflicting scene than being higher by one under conflict scene
A order of magnitude.Therefore, can part non conflicting mistake directly be judged by Bal and Bar, and is inserted into symmetrical generation domain
Block can improve judgement precision.
3, packet error detection method provided by the invention first uses the average error rate for generating domain block afterwards with non conflicting field
The maximum value that the average error rate of domain block is generated after under scape compares, it can be determined that goes out part non conflicting mistake, then passes through front and back
Generate domain block in average error rate bit difference value than in the case that non conflicting bit difference value than maximum value and conflict situations
Lower bit difference value than minimum value compare, can determine whether the error reason of remaining wrong packet, improve the judging efficiency of this method.
4, packet error detection device provided by the invention, data reception module receive the data be inserted into and generate domain block,
Generate domain block be position with content known codes, Data Post module pass through compare receive after domain block generation is generated in data
Code and generation domain block source code obtain average error rate and the front and back bit difference value for generating average error rate in the block of domain in the block of domain
Than false judgment module determines type of error in data transmission procedure according to the two amounts, realizes the judgement of type of error.
Description of the drawings
Fig. 1 is to generate domain block insertion method schematic diagram；
Fig. 2 is the flow chart provided by the invention based on the packet error detection method for generating domain；
Fig. 3 is provided by the invention based on BDR numeric distribution schematic diagrames in the packet error detection method for generating domain；
Fig. 4 is provided in an embodiment of the present invention based on the packet error detection device for generating domain；
Fig. 5 is the packet error detection device based on generation domain that another embodiment of the present invention provides.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
The present invention proposes a kind of packet error detection method based on generation domain, and the present invention, which mainly passes through, detects error number
Whether caused by conflict scene according to packet, to avoid the hidden terminal problem in network, improves network transmission performance.By to list
The detection of a erroneous packets is it may determine that error packet reason, error detection is real-time and expense is small.
After node is normally received a complete data packet, cyclic redundancy check (CRC) can be carried out, utilizes what is arranged in advance
CRC generator polynomials, the correctness of verify data packet.We are in order to examine the wrong packet reason of unknown content data packet, original
Bit sequence known to some contents is inserted in the data packet of transmission, is a generation domain block, Suo Yousheng per a bit of sequence
It is formed at domain block and generates domain.It generates domain detection to run after CRC check goes out packet error, is that a kind of new special detection is wrong
Accidentally packet whether the algorithm caused by conflict scene.
Fig. 1 is to generate domain block insertion method schematic diagram.During source node collects data and forms data packet, exist
The generation domain block of corresponding number is inserted into data packet according to the encoding rate of network requirement.Visible generation domain block is divided into front and back in figure
Two parts are inserted respectively into data frame front and tail portion.It generates domain block 1 and constitutes previous existence into domain block to n, generate domain block n+1 to 2n
Domain block is generated after composition, positioned at the generation domain block insertion position of forefoot area be located on the generation domain block insertion position of rear region about
It is symmetrical in the middle part of data frame.
Fig. 2 is flow chart of steps of the present invention, a kind of packet error detection method based on generation domain provided by the invention,
Include the following steps：
Region is inserted into and generates domain block before and after data packet before S110 transmission, and is inserted into positioned at the generation domain block of forefoot area
The generation domain block insertion position that position is located on rear region is symmetrical, forms previous existence into domain block and rear generation domain block；Wherein, domain is generated
Block code known to known, content for position in the packet；
S120 receiving terminals receive data packet and by CRC check misjudgment after, extract the generation domain block of insertion, start to generate
Domain is detected, and detects previous existence into the average error rate of domain block and the rear average error rate for generating domain；
Specifically, previous existence is calculated into the average error rate Bal of domain block and the rear average error rate Bar for generating domain block according to such as
Lower formula：
Wherein, BEL is error bit number of the previous existence at domain block, and BEA is the bit number for all generating domain block；
Wherein, the error bit number of domain block is generated after BER is.
S130 was according to previous existence at the average error rate, the rear average error rate for generating domain and the front and back average mistake for generating domain in domain
Code check bit difference value is than determining packet error type.
Wherein, step S130 includes the following steps：
S131 judges whether previous existence at the average error rate Bal of domain block is 0, if so, entering step S133, otherwise, enters
Step S132；
Whether S132 generates domain block average error rate Bar after judging is flat less than generation domain block rear under non conflicting scene
The size of the maximum value Bar-MAX of the equal bit error rate, if so, S135 is entered step, if it is not, then entering step S133；
S133 obtained bit difference value ratio according to previous existence at the average error rate of domain block and the rear average error rate for generating domain
BDR；Specifically, the front and back bit difference value ratio BDR for generating domain block average error rate is calculated according to following formula：
S134 by bit difference value ratio BDR under non conflicting scene bit difference value than maximum value BDRn-MAX and the field that conflicts
Under scape bit difference value than minimum value BDRc-MIN compare；
If bit difference value ratio BDR be less than under non conflicting scene bit difference value than maximum value BDRn-MAX, enter step
Rapid S135；
If bit difference value ratio BDR be more than conflict scene under bit difference value than minimum value BDRc-MIN, enter step
S136；
If bit difference value ratio BDR be under non conflicting scene bit difference value than maximum value BDRn-MAX and conflict scene
Lower bit difference value than minimum value BDRc-MIN between, then enter step S137；
S135 misjudgments are non conflicting mistake；
S136 misjudgments are collision error；
S137 type of errors can not judge.
Generate the maximum value Bar-MAX of domain block average error rate in above-mentioned steps afterwards under non conflicting scene, in non conflicting
Under scene bit difference value than maximum value BDRn-MAX and conflict scene under the minimum value BDRc-MIN of bit difference value ratio pass through
Repeatedly to the acquisition for statistical analysis of the different bit error rates under conflict and the experiment of non conflicting scene.
Method provided by the invention is that errant bit locations divide under the scene that conflicts and under non conflicting scene based on data packet
Cloth ratio has an apparent difference, and it is latter half of to concentrate on data packet for the position of error bit under the scene that conflicts, and under non conflicting scene
Error bit is evenly distributed so that the bit error rate under non conflicting scene than being higher by an order of magnitude under conflict scene.It therefore, can be with
Part non conflicting mistake is directly judged by Bal and Bar.Due to the errant bit locations distribution proportion of data packet under different scenes
Have significantly different, therefore conflicts and from the BDR under non conflicting scene be also distributed about different regions.So finally by BDR and BDRn-
MAX and BDRc-MIN compare, and can determine whether the error reason of remaining wrong packet.
The BDR numeric distribution schematic diagrames of Fig. 3 are visible：- 1≤BDR ＜ BDRc-MAX under the scene that conflicts；Under non conflicting scene
BDER≤1 BDRn-MIN ＜；And BDRc-MAX≤BDR≤BDRn-MIN then belong to wrong Packet type can not estimate of situation.
As shown in figure 4, it is a kind of based on the packet error detection device for generating domain, including：It is sequentially connected data reception
Block 100, Data Post module 200 and false judgment module 300, wherein data reception module 100 is for receiving inserted with life
At the data packet of domain block；Data Post module 200 was used to detect inserted with previous existence in the data packet for generating domain block into domain block
Average error rate and the rear average error rate for generating domain；False judgment module 300 is used to after generate the average error rate in domain
And the front and back average error rate difference for generating domain determines packet error type.
Packet error detection device provided by the invention, data reception module is received to be inserted in the preceding part of data and rear part
Enter have generate domain block data, generate domain block be position with content known codes, Data Post module pass through than docking
Domain block code is generated after receipts in data and generates domain block source code, domain block average error rate and front and back generation are generated before and after obtaining
The bit difference value ratio of average error rate in the block of domain, false judgment module determine wrong class in data transmission procedure according to the two amounts
Type realizes the judgement of type of error.
As shown in figure 5, it is a kind of based on the packet error detection device for generating domain, in addition to including being sequentially connected data receiver
Module 100, Data Post module 200 and false judgment module 300 further include sequentially connected data pre-processing module 400
With data transmission blocks 500；Data pre-processing module 400 is used for the region before and after the data packet that do not transmit and is inserted into generation domain
Block, data transmission blocks 500 are used to send the data packet inserted with domain block is generated.
Experiment embodiment：
Using TI (Texas Instruments) company's CC2530 chips as the acp chip of wireless sensor node,
Data packet transmission under simulation conflict and non conflicting scene.Encoding rate 0.95,0.9,0.85,0.8,0.75,0.7, which corresponds to, generates domain
Block number is 4,8,12,16,20,26, each size for generating domain block is 1Byte, and the entire data packet being inserted into after generating domain is big
Small is 86Bytes.
It is respectively 0.35 and 0.5, case verification number that Bar-MAX is arranged in experiment as 0.12, BDRn-MAX and BDRc-MIN
According to the results are shown in Table 1.In non conflicting, encoding rate declines, and generates domain block number and increases, is carried by the accuracy that BDR is obtained
Height, total accuracy can reach 97.5% or more；In non conflicting, as encoding rate declines, generates domain block number and increase, it is wrong
Accidentally rate declines.If will be unable to judge also to be included into non conflicting mistake, even when in the case where encoding rate is up to 95%, domain is generated
The accuracy of detection remains to reach 92.8%.
1 case verification data result of table
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made by within principle etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of based on the packet error detection method for generating domain, which is characterized in that including：
Region is inserted into and generates domain block before and after data packet before S110 transmission, and positioned at the generation domain block insertion position of forefoot area
The generation domain block insertion position for being located on rear region is symmetrical, forms previous existence into domain block and rear generation domain block；Wherein, generating domain block is
Position is known in the packet, code known to content；
S120 received data packets, extract the generation domain block of insertion, and detect previous existence into the average error rate of domain block and rear generation domain
Average error rate；
S130 was according to previous existence at the average error rate, the rear average error rate for generating domain and the front and back average error rate for generating domain in domain
Bit difference value is than determining packet error type.
2. packet error detection method as described in claim 1, which is characterized in that step S130 includes the following steps：
S131 judges whether previous existence at the average error rate Bal of domain block is 0, if so, entering step S133, otherwise, is entered step
S132；
Whether S132 generates domain block average error rate Bar after judging is less than the rear average mistake for generating domain block under non conflicting scene
The size of the maximum value Bar-MAX of code check, if so, entering step S135 if it is not, entering step S133；
S133 obtained bit difference value ratio BDR according to previous existence at the average error rate of domain block and the rear average error rate for generating domain；
S134 by bit difference value ratio BDR under non conflicting scene bit difference value than maximum value BDRn-MAX and the scene that conflicts under
Bit difference value than minimum value BDRc-MIN compare；
If bit difference value ratio BDR be less than under non conflicting scene bit difference value than maximum value BDRn-MAX, enter step
S135；
If bit difference value ratio BDR be more than conflict scene under bit difference value than minimum value BDRc-MIN, enter step S136；
If bit difference value ratio BDR be under non conflicting scene bit difference value than maximum value BDRn-MAX and conflict scene under compare
Special difference than minimum value BDRc-MIN between, then enter step S137；
S135 misjudgments are non conflicting mistake；
S136 misjudgments are collision error；
S137 type of errors can not judge.
3. packet error detection method as claimed in claim 2, which is characterized in that in step S133：
According to formulaObtain bit difference value ratio BDR；
Wherein, Bal is average error rate of the previous existence at domain block, and Bar generates the average error rate of domain block after being.
4. packet error detection method as described in any one of claims 1 to 3, which is characterized in that in step S120：
According to formulaPrevious existence at domain block average error rate Bal, according to formulaIt is generated after acquisition
The average error rate Bar of domain block；
Wherein, BEL is error bit number of the previous existence at domain block, and BER generates the error bit number of domain block after being, BEA is all raw
At the bit number of domain block.
5. such as Claims 1-4 any one of them packet error detection method, which is characterized in that be inserted into and generate domain quantity
It is determined according to numeric field data length, permission transmitted data amount and false judgment accuracy is generated.
6. a kind of based on the packet error detection device for generating domain, which is characterized in that including：
Data reception module, for receiving in data forefoot area and rear region inserted with the data packet for generating domain block；
Data Post module, for detecting previous existence being averaged at domain block in the data packet inserted with symmetrical generation domain block
The bit error rate and the rear average error rate for generating domain；
False judgment module, for the average error rate, the rear average error rate for generating domain and front and back generation according to previous existence at domain
The average error rate bit difference value in domain is than determining packet error type.
7. packet error detection device as claimed in claim 6, which is characterized in that packet error detection device further includes
Data pre-processing module and data transmission blocks；Data pre-processing module is used for the region before and after the data packet that do not transmit and inserts
Enter symmetrical generation domain block, data transmission blocks are used to send the data packet inserted with domain block is generated.
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