CN109618302A - Novel conflict supervision avoidance strategy and method towards car networking distributed MAC protocol - Google Patents
Novel conflict supervision avoidance strategy and method towards car networking distributed MAC protocol Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance
Abstract
The invention proposes a kind of novel conflict supervision avoidance strategy and method towards car networking distributed MAC protocol, for realizing a kind of flexible and efficient carrier sense/conflict supervision evacuation competitive type distributed MAC protocol.Distributed MAC protocol based on CSMA/CSA mainly includes carrier sense, conflict supervision evacuation, access.Wherein, link state supervision module distinguishes the accumulated result of monitoring data grouping transmission success and failure, by the judgement of pre- judging module, link-quality is unobstructed or congestion, again by keep out of the way training module be adjusted flexibly to the matched back off mode of current ink quality, then, classification back-off timer jumps to and current ink quality is matched keeps out of the way grade automatically, and starting dynamic back-off timer countdown is until zero moment, new data grouping access shared accidental channel.The present invention introduces supervised training and flexible classification avoidance mechanism in conflict avoiding process, efficiently against the problem of car networking link packet collision.
Description
Technical field
The present invention relates to a kind of novel highly reliable conflict supervision evacuation (the Collision Supervision and of car networking
Avoidance, CSA) tactful and method, and for a kind of new carrier sense/conflict supervision evacuation (CSMA/CSA) competitive type
Distributed MAC protocol is realized.
Background technique
In recent years, continuous with intelligent transportation system (Intelligent Transportation Systems, ITS)
Development, vehicle self-organizing network (Vehicular ad hoc Networks, VANET) become the important component of ITS, no
It only provides road safety relevant service, also traffic is made to become highly effective and safe.Meanwhile vehicle net (V2X) is also 3GPP international
For one of the important scenes of 5G Communication Studies in standard, for this purpose, major transformation will occur for the 5G network architecture.Due to vehicle net section
Point mobility strong, topological dynamic change will lead to network connectivty decline, the wireless channel multiple access in conventional wireless network
Control strategy will face the challenge, and therefore, designing new and effective reliable MAC becomes particularly important.VANET system has been continued to use wirelessly
Local area network distributed MAC protocol has certain reference significance, and for vehicle Network Communication, the distribution based on novel competitive strategy
MAC can be extended 5G network accessibility, it will help the diversification of the following 5G network.
There are two class equipment: roadside unit (Road Side Unit, RSU) and on board unit (Onboard in VANET
Unit, OBU).RSU is typically mounted on traffic lights, in lamp stand, and OBU is provided in vehicle node, and can be in vehicle
It works when node motion.VANET can realize two kinds of communication modes: vehicle node to vehicle node by OBU and RSU
(Vehicle to Vehicle, V2V) communication, with vehicle node to infrastructure (Vehicle to Infrastructure,
V2I it) communicates.
The communication node of VANET is mainly vehicle, and the quick relative mobility of vehicle node causes VANET topological structure
It is frequent variation, communication link quality dynamic change, to be easy to cause the communication disruption between node, peace can not be sent in time
It totally disappeared breath.In VANET equipment, MAC protocol is responsible for access of the vehicle node to shared channel in management and coordination network, makes vehicle
Node can access in time channel and reliably send security message.
VANET uses IEEE 802.11p standard, and wherein MAC protocol inherits the CSAM/CA association of WLAN WLAN
View.In IEEE 802.11a standard, wlan network uses distributed coordination function (Distributed Coordination
Function, DCF) as node access channel fundamental mechanism.In DCF mechanism, each node is sending data packet grouping
It is monitored before firstly the need of to channel.When the channel is idle, node can send data packet grouping immediately, and otherwise node will
Waiting always is become idle state again from busy state until channel and starts a backoff procedure.DCF mechanism uses tradition
Binary exponential backoff (Binary Exponential Backoff, BEB) method come handle letter data grouping transmission when production
Raw collision problem.Although BEB method is used for distributed MAC protocol, BEB still can not meet well VANET high can
The communicating requirement leaned on, especially in the case where traffic density dynamic change, BEB avoidance mechanism choose node can not rationally
Competition window, the grouping of a large amount of data packet can meet with collision and retransmit, so as to cause broken communication connection, the net between node
The throughput degradation of network.
Many improved methods are suggested at present, and for example enhanced collision avoids (Enhanced Collision
Avoidance, ECA), it sequence can be chosen until suitable competition window avoids packet collisions when traffic density is low, improvement gulps down
The amount of spitting.However existing back off algorithm, during traffic density quick dynamic change, throughput performance is decreased obviously, even
It may cause deterioration suspension.
Summary of the invention
The object of the present invention is to provide a flexible and efficient carrier sense/conflict supervision evacuation (CSMA/CSA) competitions
Type distributed MAC protocol is to support high-throughput, highly reliable car networking communication.
In order to achieve the above object, the technical solution of the present invention is to provide towards the new of car networking distributed MAC protocol
Avoidance strategy and method are supervised in type conflict, which comprises the following steps:
Step 1, classification back-off timer by preset entire optional time range be initialized as several it is cascade with move back
The corresponding competition window of grade is kept away, competition window is the opportunity range of choice of permit nodes competition random access channel；
Step 2, link state supervision counter respectively supervise the accumulated result of data grouping transmission success or failure
It superintends and directs, and adjudicates by presetting detected rule by the pre- judging module of unobstructed/congestion that link-quality is unobstructed or congestion；
Step 3 keeps out of the way supervision of the training module based on link state supervision counter acquisition as a result, keeping out of the way mould using three kinds
Formula: if link is flexible smooth, grade is kept out of the way in reduction；If link becomes congestion, grade is kept out of the way in increase；Otherwise, it keeps keeping out of the way originally
Grade when keeping out of the way change of rank, is jumped using keeping out of the way, and is quickly jumped to automatically and current ink quality from grade of keeping out of the way before
It is matched to keep out of the way grade, suitable matching competition window is obtained in time；
Step 4 updates classification back-off timer according to current matching competition window, and match in competition window arbitrarily with
Maximum possible random value of the machine number as classification back-off timer initial time, so generates new classification back-off timer；
Step 5, starting classification back-off timer countdown, new packet delay waits, until timing is kept out of the way in classification
Device is zeroed the moment, and new data grouping accesses shared channel.
Preferably, in step 1, cascade competition window increases method using binary system index, or uses other Function Modules
Type increases method.
Preferably, in step 2, detected rule is detected using continuous success or failure state threshold, defeated if reaching threshold value
Do well testing result, and otherwise hold mode is constant.
Preferably, step 1 includes:
Optional time range is preset as [0, CWmax-1] by step 101, and in formula, CWmax indicates that back-off timer is optional
The backoff contention window maximum magnitude selected；
Step 102, classification back-off timer are initialized as m cascade competition windows corresponding with grade is kept out of the way, respectively
Grade competition window range is as follows:
BII=([0, CW0-1],...,[CWi-1,CWi-1],...,[CWm-1,CWm-1])
In formula, BII indicates classification backoff contention window full set；CWiExpression i-stage backoff contention window, i ∈ [0,
M], CWi=2iCWbackoff, CWmin< CWi< CWmax, CWmin=CWbackoff, CWmax=2mCWbackoff, CWbackoffIt is moved back for minimum
Keep away step-length；
Step 103, correspondence currently keep out of the way grade i, are classified the initial value T of back-off timeriAre as follows:
Ti=Ni* σ, in formula, random number Ni∈[CWi-1,CWi- 1], σ indicates a time slot；
Step 104, competition window increase method classification using BEB binary system index, or increased using other function models
Method, keeping out of the way the corresponding competition window of grade i is [CWi-1,CWi-1]。
Preferably, in step 2, configured with the counting that statistics is successfully accessed or fails respectively in link state supervision counter
Device NS and NC, then link state supervision counter is as follows to channel quality monitor procedure:
If source node receives the ACK acknowledgement frame of destination node transmission, show data packet transfer success, then counter NS
It is cumulative, NS=NS+1；If source node does not receive the ACK acknowledgement frame of destination node transmission, show that data packet transfer fails,
Then counter NC is cumulative, NC=NC+1.
Preferably, in step 2, the pre- judging module detection link state of unobstructed/congestion is as follows:
If the counter NS reaches preset upper threshold Th_S, when meeting NS=Th_S, then current ink quality
Judgement is unimpeded output, meanwhile, the counter NS is reset, i.e. NS=0；If the counter NC reaches in preset threshold value
Th_C is limited, when meeting NC=Th_C, then current ink quality judgement is congestion output, meanwhile, the counter NC is reset, i.e. NC
=0；Otherwise, keep link state constant.
Preferably, it in step 3, if link is flexible smooth, randomly chooses smaller matching and keeps out of the way grade MBR；If link matter
Quantitative change congestion then randomly chooses bigger matching and keeps out of the way grade MBR；Otherwise, it keeps original and keeps out of the way grade MBR；
It is [CW according to the MBR matching competition window MCW for obtaining the access of data grouping next timeMBR-1,CWMBR, and CW -1]MBR
=2MBRCWbackoff。
Preferably, in step 4, it is as follows to update classification back-off timer:
A numerical value of N is randomly selected in matching competition window range MCWMBR, NMBR∈[CWMBR-1,CWMBR- 1], update and divide
Grade back-off timer initial value TMBR=NMBR* σ, wherein σ indicates a time slot；It subsequently generates a new classification and keeps out of the way timing
Device,
The present invention introduces supervised training and flexible classification avoidance mechanism in conflict avoiding process, propose it is a kind of towards
Novel conflict supervision evacuation (Collision Supervision and Avoidance, the CSA) association of the mobile networks such as vehicle connection
View, effectively overcomes the problems, such as that car networking link packet is collided, and handling capacity rapid decrease when alleviating car networking channel busy avoids net
Network penalty even interrupts, and enhances communication robustness, promotes delivery of packets success rate, close particularly suitable for the magnitude of traffic flow
Car networking communications applications under degree, network topology change, Mobile Fading Channels.
New both having been made based on CSMA/CSA competitive type distributed MAC (Media Access Control) is intensive in vehicle flowrate
In the case where, still maintain high-throughput, the highly reliable ability for accessing shared channel.It is especially safe for car networking application
The application of class, CSMA/CSA agreement support security message data grouping also can car networking communication in the case where traffic density changes
It avoided collision in time varying channel, transmit to promote the pre-alerting ability between vehicle node in time in the channel.
Detailed description of the invention
Fig. 1 is present invention conflict supervision evacuation (CSA) agreement flow chart；
Fig. 2 is present invention conflict supervision evacuation (CSA) schematic diagram (containing main classification back off mode)；
The dynamic back off mode that CSA agreement is supported is flexible, main three classes: when channel is flexible smooth, jumping to small keep out of the way
Grade, competition window tend to reduce；When channel change congestion, big grade of keeping out of the way is jumped to, competition window tends to increase；Work as channel ratio
It is more stable, keep out of the way grade before keeping；
Fig. 3 is present invention conflict supervision evacuation (CSA) actualizing exemplary diagram；
Conflict supervision evacuation (CSA) agreement includes that two key steps are kept out of the way in supervised training and classification, can effectively be overcome
The problem of packet collisions；Mainly include link state supervision module, the pre- judging module of unobstructed/congestion, keep out of the way training module and
It is classified four functional modules of back-off timer；
Fig. 4 is carrier sense of the present invention/conflict supervision evacuation (CSMA/CSA) distributed MAC flow chart；
It is new based on CSMA/CSA competitive type distributed MAC protocol process mainly include carrier sense, conflict supervision evacuation,
Three steps are accessed, and the supervision evacuation process that conflicts applies CSA agreement of the invention, realizes that the accidental channel of communication node connects
Enter control function, be a kind of novel highly reliable channel competition access strategy, is mainly used in that network topology change is big, communication chain
The fast-changing car networking in road, Sensor Network, self-organizing network etc..It is supervised currently, distributed MAC protocol is generallyd use based on carrier wave
Multiple access access/conflict avoiding (CSMA/CA) contention access mode is listened, for example WiFi equipment use in WLAN
802.11 standard；
Fig. 5 is CSA agreement back off mode application exemplary diagram of the present invention when vehicle Network Communication is unimpeded；
When car networking network is unimpeded, white vehicle uses the back off mode of CSA agreement in figure: matching competition window is MCW1,
Backoff counter T1；
Fig. 6 CSA agreement back off mode application exemplary diagram of the present invention when being vehicle Network Communication congestion；
When car networking network congestion, white vehicle uses the back off mode of CSA agreement in figure: matching competition window for
MCW3, backoff counter T3；
Fig. 7 is that CSA agreement handling capacity of the present invention compares with the performance that network node density changes；
Three kinds of agreements compare, and when node density is low, CSA agreement can obtain higher handling capacity, and as node is close
Degree increases, and the decline of CSA agreement energy throughput performance is alleviated；
Fig. 8 is that CSA protocol packet delivery ratio of the present invention compares with the performance that network node density changes；
Three kinds of agreements compare, and CSA agreement can obtain higher Packet delivery fractions, and in high density node, CSA
Agreement can maintain higher Packet delivery fractions.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
The present invention provides a kind of, and the novel conflict supervision towards car networking distributed MAC protocol avoids (Collision
Supervision and Avoidance, CSA) tactful and method, for realizing a kind of flexible and efficient carrier sense/conflict
Supervision evacuation (CSMA/CSA) competitive type distributed MAC protocol mainly includes that two steps are kept out of the way in supervised training and classification, mainly
By link state supervision module, the pre- judging module of unobstructed/congestion state, keep out of the way training module and classification back-off timer structure
At, specifically includes the following steps:
Step 1, classification back-off timer by preset entire optional time range be initialized as several it is cascade with move back
The corresponding competition window of grade is kept away, competition window is the opportunity range of choice of permit nodes competition random access channel.Initially
Change stage definitions and each keep out of the way the corresponding competition window of grade, simply, binary system index increasing can be used in grading competition window
Adding method.
Step 1 includes:
Optional time range is preset as [0, CWmax-1] by step 101, and in formula, CWmax indicates that back-off timer is optional
The backoff contention window maximum magnitude selected；
Step 102, classification back-off timer are initialized as m cascade competition windows corresponding with grade is kept out of the way, respectively
Grade competition window range is as follows:
BII=([0, CW0-1],...,[CWi-1,CWi-1],...,[CWm-1,CWm-1])
In formula, BII indicates classification backoff contention window full set；CWiExpression i-stage backoff contention window, i ∈ [0,
M], CWi=2iCWbackoff, CWmin< CWi< CWmax, CWmin=CWbackoff, CWmax=2mCWbackoff, CWbackoffIt is moved back for minimum
Keep away step-length；
Step 103, correspondence currently keep out of the way grade i, are classified the initial value T of back-off timeriAre as follows:
Ti=Ni* σ, in formula, random number Ni∈[CWi-1,CWi- 1], σ indicates a time slot；
Step 104, competition window increase method classification using BEB binary system index, keep out of the way the corresponding competition window of grade i
For [CWi-1,CWi-1]。
Step 2, link state supervision counter respectively supervise the accumulated result of data grouping transmission success or failure
It superintends and directs, and adjudicates by presetting detected rule by the pre- judging module of unobstructed/congestion that link-quality is unobstructed or congestion.Simply,
Detected rule is detected using continuous success or failure state threshold, if reaching threshold value, otherwise outputs state detection is as a result, keep
State is constant.
It is configured with the counter NS and NC that statistics is successfully accessed or fails respectively in link state supervision counter, then link
State supervision counter is as follows to channel quality monitor procedure:
If source node receives the ACK acknowledgement frame of destination node transmission, show data packet transfer success, then counter NS
It is cumulative, NS=NS+1；If source node does not receive the ACK acknowledgement frame of destination node transmission, show that data packet transfer fails,
Then counter NC is cumulative, NC=NC+1.
The pre- judging module detection link state of unobstructed/congestion is as follows:
If the counter NS reaches preset upper threshold Th_S, when meeting NS=Th_S, then current ink quality
Judgement is unimpeded output, meanwhile, the counter NS is reset, i.e. NS=0；If the counter NC reaches in preset threshold value
Th_C is limited, when meeting NC=Th_C, then current ink quality judgement is congestion output, meanwhile, the counter NC is reset, i.e. NC
=0；Otherwise, keep link state constant
Step 3 keeps out of the way supervision of the training module based on link state supervision counter acquisition as a result, keeping out of the way mould using three kinds
Formula: if link is flexible smooth, grade is kept out of the way in reduction, is randomly choosed smaller matching and is kept out of the way grade MBR；If link becomes congestion,
Grade is kept out of the way in increase, is randomly choosed bigger matching and is kept out of the way grade MBR；Otherwise, it keeps keeping out of the way grade MBR originally.CSA support according to
It is secondary, keep out of the way across grade, continuous etc. and jump, quickly jumped to automatically and current ink quality is matched keeps out of the way from grade of keeping out of the way before
Grade obtains suitable timer matching competition window in time.
It is [CW according to the MBR matching competition window MCW for obtaining the access of data grouping next timeMBR-1,CWMBR, and CW -1]MBR
=2MBRCWbackoff
Step 4 updates classification back-off timer according to current matching competition window, and match in competition window arbitrarily with
Maximum possible random value of the machine number as classification back-off timer initial time, so generates new classification back-off timer.
It is as follows to update classification back-off timer:
A numerical value of N is randomly selected in matching competition window range MCWMBR, NMBR∈[CWMBR-1,CWMBR- 1], update and divide
Grade back-off timer initial value TMBR=NMBR* σ, wherein σ indicates a time slot；It subsequently generates a new classification and keeps out of the way timing
Device.
Step 5, starting classification back-off timer countdown, new packet delay waits, until timing is kept out of the way in classification
Device is zeroed the moment, and new data grouping accesses shared channel.
The communication of vehicle net node is using new based on the competitive type distribution of carrier sense/conflict supervision evacuation (CSMA/CSA)
Formula MAC protocol mainly includes carrier sense, three conflict supervision evacuation, access steps；And conflict supervision evacuation process applies
Above-mentioned technical proposal provided by the invention realizes accidental channel access control function, is a kind of novel high-throughput, highly reliable
Channel competition access strategy.Locating especially for the application of car networking security classes since the supervised training of CSA and classification are kept out of the way
Flexible and efficient when reason car networking dynamic link packet collisions problem, CSMA/CSA agreement supports security message data grouping in vehicle
Also it is avoided that collision in the case where variable density, transmits to promote the early warning energy between vehicle node in time in the channel
Power.
Claims (8)
1. a kind of novel conflict supervision avoidance strategy and method towards car networking distributed MAC protocol, which is characterized in that including
Following steps:
Step 1, classification back-off timer by preset entire optional time range be initialized as several it is cascade with keep out of the way
The corresponding competition window of grade, competition window are the opportunity ranges of choice of permit nodes competition random access channel；
Step 2, link state supervision counter respectively exercise supervision to the accumulated result of data grouping transmission success or failure, and
Adjudicate by presetting detected rule that link-quality is unobstructed or congestion by the pre- judging module of unobstructed/congestion；
Step 3 keeps out of the way supervision of the training module based on link state supervision counter acquisition as a result, using three kinds of back off mode:
If link is flexible smooth, grade is kept out of the way in reduction；If link becomes congestion, grade is kept out of the way in increase；Otherwise, it keeps keeping out of the way originally
Grade, when keeping out of the way change of rank, is jumped using keeping out of the way, is quickly jumped to automatically and current ink quality from grade of keeping out of the way before
That matches keeps out of the way grade, obtains suitable matching competition window in time；
Step 4 updates classification back-off timer according to current matching competition window, and matches any random number in competition window
As the maximum possible random value of classification back-off timer initial time, new classification back-off timer is so generated；
Step 5, starting classification back-off timer countdown, new packet delay waits, until classification back-off timer is returned
Zero moment, new data grouping access shared channel.
2. a kind of novel conflict supervision avoidance strategy and side towards car networking distributed MAC protocol as described in claim 1
Method, which is characterized in that in step 1, cascade competition window increases method using binary system index.
3. a kind of novel conflict supervision avoidance strategy and side towards car networking distributed MAC protocol as described in claim 1
Method, which is characterized in that in step 2, detected rule is detected using continuous success or failure state threshold, defeated if reaching threshold value
Do well testing result, and otherwise hold mode is constant.
4. a kind of novel conflict supervision avoidance strategy and side towards car networking distributed MAC protocol as described in claim 1
Method, which is characterized in that step 1 includes:
Optional time range is preset as [0, CWmax-1] by step 101, and in formula, CWmax indicates that back-off timer is selectable
Backoff contention window maximum magnitude threshold value；
Step 102, classification back-off timer are initialized as m cascade competition windows corresponding with grade is kept out of the way, Ge Jijing
It is as follows to strive window ranges:
BII=([0, CW0-1],...,[CWi-1,CWi-1],...,[CWm-1,CWm-1])
In formula, BII indicates classification backoff contention window full set；CWiIndicate i-stage backoff contention window, i ∈ [0, m], CWi
=2iCWbackoff, CWmin< CWi< CWmax, CWmin=CWbackoff, CWmax=2mCWbackoff, CWbackoffKeep out of the way step for minimum
It is long；
Step 103, correspondence currently keep out of the way grade i, are classified the initial value T of back-off timeriAre as follows:
Ti=Ni* σ, in formula, random number Ni∈[CWi-1,CWi- 1], σ indicates a time slot；
Step 104, competition window increase method classification using BEB binary system index, or increase method using other function models,
Keeping out of the way the corresponding competition window of grade i is [CWi-1,CWi-1]。
5. a kind of novel conflict supervision avoidance strategy and side towards car networking distributed MAC protocol as described in claim 1
Method, which is characterized in that in step 2, configured with the counting that statistics is successfully accessed or fails respectively in link state supervision counter
Device NS and NC, then link state supervision counter is as follows to channel quality monitor procedure:
If source node receives the ACK acknowledgement frame of destination node transmission, show data packet transfer success, then counter NS is tired
Add, NS=NS+1；If source node does not receive the ACK acknowledgement frame of destination node transmission, show that data packet transfer fails, then
Counter NC is cumulative, NC=NC+1.
6. a kind of novel conflict supervision avoidance strategy and side towards car networking distributed MAC protocol as claimed in claim 5
Method, which is characterized in that in step 2, the pre- judging module detection link state of unobstructed/congestion is as follows:
If the counter NS reaches preset upper threshold Th_S, when meeting NS=Th_S, then current ink quality is adjudicated
For unimpeded output, meanwhile, the counter NS is reset, i.e. NS=0；If the counter NC reaches preset upper threshold
Th_C, when meeting NC=Th_C, then current ink quality judgement is congestion output, meanwhile, the counter NC is reset, i.e. NC=
0；Otherwise, keep link state constant.
7. a kind of novel conflict supervision avoidance strategy and side towards car networking distributed MAC protocol as described in claim 1
Method, which is characterized in that in step 3, if link is flexible smooth, randomly chooses smaller matching and keep out of the way grade MBR；If link-quality
Become congestion, then randomly chooses bigger matching and keep out of the way grade MBR；Otherwise, it keeps original and keeps out of the way grade MBR；
It is [CW according to the MBR matching competition window MCW for obtaining the access of data grouping next timeMBR-1,CWMBR, and CW -1]MBR=
2MBRCWbackoff。
8. a kind of novel conflict supervision avoidance strategy and side towards car networking distributed MAC protocol as claimed in claim 7
Method, which is characterized in that in step 4, it is as follows to update classification back-off timer:
A numerical value of N is randomly selected in matching competition window range MCWMBR, NMBR∈[CWMBR-1,CWMBR- 1], classification is updated to move back
Keep away timer initial value TMBR=NMBR* σ, wherein σ indicates a time slot；Subsequently generate a new classification back-off timer.
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| CN111585843A (en) * | 2020-05-08 | 2020-08-25 | 西安电子科技大学 | Link effective high dynamic network medium access method |
| CN112437498A (en) * | 2020-11-10 | 2021-03-02 | 中国人民解放军海军航空大学航空作战勤务学院 | Data link protocol back-off algorithm based on channel state judgment and priority |
| CN113110111A (en) * | 2021-05-10 | 2021-07-13 | 电子科技大学长三角研究院(衢州) | Distributed semi-physical simulation system based on NS3 |
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