CN107872400A - Multi-audio-frequency document distribution method based on NDN in a kind of VANET - Google Patents
Multi-audio-frequency document distribution method based on NDN in a kind of VANET Download PDFInfo
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- CN107872400A CN107872400A CN201711384136.7A CN201711384136A CN107872400A CN 107872400 A CN107872400 A CN 107872400A CN 201711384136 A CN201711384136 A CN 201711384136A CN 107872400 A CN107872400 A CN 107872400A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
- H04L47/2475—Traffic characterised by specific attributes, e.g. priority or QoS for supporting traffic characterised by the type of applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The invention discloses the Multi-audio-frequency document distribution method based on NDN in a kind of VANET, it includes：The data that present node matches according to demand data corresponding with interest bag is whether there is in the name query of interest bag its local cache；During the data not matched in the local cache of present node, interest is forwarded a packet into adjacent node according to default forwarding strategy；When there is packet return, present node is first by data pack buffer into its local cache, then packet is transmitted to consumer node by receiving interface according to corresponding to the interest bag recorded in its local PIT table, and the value of the first field in interest bag redefines the value of the 3rd field in its local PIT table.Data are scheduled by difference of the present invention according to user to resource requirement pressing degree using different forwarding strategies, so as to while user's request is met, reduce the quantity of packet in network, improve network performance.
Description
Technical field
The present invention relates to vehicle self-organizing network technology field, more particularly to the multitone frequency file based on NDN in a kind of VANET
Distribution method.
Background technology
VANET (vehicular ad hoc network, vehicle self-organizing net) is a kind of self-organizing, the car of structure opening
Communication network between, it is a kind of special MANET (mobile ad hoc networks, mobile ad hoc network), its target is
In order to built on road self-organizing, low-cost, deployment is convenient, structure opening inter-vehicular communication network, can be with
Continually changing network topology structure is adapted to, communication is provided between road vehicle, between vehicle and roadside fixed access point.
NDN (Named Data Networking, naming data network) is in 2010 by National Science Foundation
One of Future network architectures research approach initiated.It is intended to develop the brand-new network architecture, to meet emerging communication need,
And substitute existing ICP/IP protocol, by establishing brand-new frame system network using content as center, strive for overturning dominant force
The semicentennial ICP/IP protocol in internet.
The current TCP/IP network architectures increase difficulty to the realization of VANET deployment and application, and it builds end to end
Vertical connection communication is difficult to realize under the network topology structure of highly dynamic change.But NDN networks have born branch to mobility
Advantage is held, it does not have the VANET networks that center does not have the pattern of level to be more suitable for no fixed structure.Mobile vehicle leaves original
Come position, as long as application obtains data can again, and data can be regained near new position, without with it is original
Data source keep connection and re-establish connection.IP network is thus avoided because node motion or node address change
Change causes the communication issue that disconnecting is brought.
According to the NDN forwarding processes of standard, consumer sends interest bag (interest packet), after the producer receives
According to solicited message, returned packet is placed in packet (data packet) and returns to consumer.And for bigger text
Part such as audio file, conventional way are exactly to split the file into multiple fragments, segment requests, again will after asking to arrive all fragments
These fragments are merged into a complete file, and this way typically broadcasts interest bag by flooding mechanism, though this method
So packet can be rapidly obtained so as to meet the needs of user.But some can be brought not under the specific environment of vehicle-mounted net
The influence of profit.Interest bag is forwarded to node non-selectivity to make the quantity of interest bag in network transmission process in the form of broadcast first
It is in multiple increase.The surge of interest bag quantity, undoubtedly add network overhead, waste meaningless network traffics, caching waste,
Influence forward efficiency.In addition, the effect under special scenes is also undesirable, difference is not done according to the demand urgency level of user
Processing, also result in the consequence of poor user experience.
The content of the invention
For above-mentioned the shortcomings of the prior art, the application provides the Multi-audio-frequency based on NDN in a kind of VANET
Document distribution method, difference of this method according to user to resource requirement pressing degree, using different forwarding strategies to data
It is scheduled, so as to while user's request is met, reduce the quantity of packet in network, improve network performance.Should
The Multi-audio-frequency document distribution method based on NDN comprises the following steps in VANET：
Step 1：Present node delays according to the local of the name query itself of the interest bag received at consumer node
Deposit and whether there is the data that demand data corresponding with the interest bag matches, the interest bag includes representing the demand number
According to delay sensitive the first field and represent the second field of the segments that the demand data included；
Step 2：When the data to match in the local cache in the present node be present, the present node will
The data to match are sent to the consumer node；When the data not matched in the local cache of the present node
When, present node recorded title and receiving interface corresponding to the interest bag in its local PIT table, then turn according to default
The interest is forwarded a packet to all adjacent nodes by hair strategy, and the PIT tables include representing not yet to obtain in the demand data
3rd field of the segments got, the initial value of the 3rd field are the value of the second field in the interest bag；
Step 3：The adjacent node whether there is in the local cache according to the name query itself of the interest bag with it is described
The data that demand data corresponding to interest bag matches；
Step 4：When the data to match are not present in the local cache of the adjacent node, the adjacent node is pressed
The interest bag is transmitted to other adjacent nodes according to the default forwarding strategy；Deposited when in the local cache of the adjacent node
In the data to match, the data to match are packaged into packet and are sent to the present node by the adjacent node；
Step 5：When the present node receives the packet, it is cached to first in the local cache of itself,
Then the packet is transmitted to the consumption by the receiving interface according to corresponding to the interest bag recorded in its local PIT table
Person's node, and the value of the first field in the interest bag redefines the value of the 3rd field in its local PIT table.
Alternatively, the value of first field is the first numerical value or second value, wherein described in first numerical value expression
Demand data is time-delayed sensitive data, and the second value represents that the demand data is non-time-delayed sensitive data.
Alternatively, when the value of the first field in the interest bag is the first numerical value, present node in the step 5
The packet is transmitted to the consumer node, and the first field in the interest bag redefines its local
The value of the 3rd field in PIT tables, it is specially：
The packet is transmitted to the consumer node by present node, and keeps the 3rd word in its local PIT table
The value of section is constant；
When the value of the first field in the interest bag is second value, present node is by packet in the step 3
Be transmitted to the consumer node, and the first field in the interest bag redefine in its local PIT table the 3rd
The value of field, it is specially：
The packet is transmitted to the consumer node by present node, and by the 3rd field in its local PIT table
Value subtract 1.
Alternatively, the default forwarding strategy includes：The demand data that the consumer node has cached according to it
Size determined by the interest bag forwarding speed, the need that the forwarding speed and the consumer node have cached
The size of data is asked to be inversely proportional.
Alternatively, present node described in the step 2 by the data to match be sent to the consumer node it
Afterwards, methods described also includes：The value of the 3rd field in its local PIT table is subtracted 1 by the present node.
Alternatively, after the step of value of the 3rd field in its local PIT table is subtracted 1 by the present node, the side
Method also includes：
When the value of the 3rd field in the local PIT tables of the present node is 0, present node deletes its local PIT
List item corresponding to interest bag described in table.
Alternatively, the title of the interest bag uses the naming method of hierarchy.
Alternatively, the title of the interest bag is divided into five Primary layers, and its pattern is：Resource name/segment name/user
ID/ timestamps.
Present invention is mainly used for solve to realize that similar electronics listens the complexity of the multitone frequency file scene such as book system in VANET
In the case of data distribution problem.Imitated by the retrieval for effectively increasing data using the naming method of hierarchy to interest bag
The request success rate of rate and data.According to the difference of the demand pressing degree of data, data are entered using different forwarding strategies
Row scheduling.In addition max-forwards number is have also been devised, the propagation to redundancy interest bag has carried out prevention to a certain extent.In industry
Business is when belonging to non-delay sensitive business, using the forwarding of selectivity, has so both been avoided that packet ' preemptive type rob ' network flow
Amount, and can accomplish that continuation obtains resource data in case of need.When business belongs to delay sensitive business, using efficient
Give tacit consent to forwarding strategy, meet the needs of user in the form of efficiently forwarding packet.So that with few when demand is higher
Measuring bandwidth cost increases network speed to obtain data, saves flow through a network in the case where demand is relatively low, avoids and work as vehicle flowrate
The network congestion problem brought is possible to when increasing.
Brief description of the drawings
Fig. 1 is the flow of the Multi-audio-frequency document distribution method based on NDN in the VANET that first embodiment of the invention provides
Figure；
Fig. 2 is the flow of the Multi-audio-frequency document distribution method based on NDN in the VANET that second embodiment of the invention provides
Figure.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
First embodiment
S101, present node inquires about in its local cache CS whether there is the data to match, if deposited in the CS of present node
Then enter S102 in the data to match, otherwise into S103.
It should be noted that in view of mobile attribute possessed by vehicle self-organizing net, each car is distinguished in the present embodiment
Regard a network node in car self-organization network as, realize that electronics class of listening to storytelling provides by improved NDN mechanism between each node
The transmission in source is shared.Due to NDN networks be network using content as center, so in NDN networks content storage, search and
Forwarding is all based on the title of content, and the structure of title can produce considerable influence, and in view of electronics to its availability and autgmentability
Listen to storytelling etc. file (chapters and sections) sectionalization of scene the characteristics of, in order to realize reliable acquisition of the name data in the whole network, this implementation
The name of interest bag is also divided into difference by the name in example for the interest bag in NDN using the naming method of hierarchy
Several parts, wherein the length of each part is not fixed.
Specifically, the title of interest bag is divided into five Primary layers in the present embodiment, its pattern is：Resource name/chapter
(fragment) title/ID/timestamp is saved, such as " Yue Fei passes/rolled up one/capital SADJ2333/9:45:31AM ", wherein first layer
Represent the name of searching resource；The second layer is searched resource for optimization driving user and designed, because electron reading often divides
Volume burst section is so the retrieval of information and shared and added one layer of chapters and sections (fragment) title and carried out with this after for convenience
Refinement；The ID that third layer includes is unique, and system can obtain registration according to the information of vehicle in a manner of license plate number etc.
The vehicle ID crossed.ID layer is designed to ensure information safety, while also ensure that the unique Home of data.When last
Between stab layer include data produce when time, so as to the repetition for avoiding information.
In addition, in order to subsequently select different forwarding strategies for the demand degree of urgency of data, the present embodiment exists
Two fields, respectively urgentValue fields and hopCount words are added on the basis of the data structure of traditional interest bag
Section, wherein urgentValue fields are used for representing the delay sensitive of demand data, and its value is urgent or notUrgent,
Wherein urgent represents that demand data is time-delayed sensitive data, and now the demand degree of urgency of data is higher, and notUrgent represents to need
It is non-time-delayed sensitive data to seek data, and now the demand degree of urgency of data is relatively low.
HopCount fields are used to represent the segments that demand data is included.It is correspondingly same in the PIT tables of node
Also increase hopCount field and be used for counting the segments not yet obtained in some interest bag, its initial value be receive it is emerging
The value of hopCount fields in interest bag, if the value of the hopCount fields in PIT tables is zero, illustrate that the interest bag institute is right
The demand data answered all obtains.Therefore the forwarding of the interest bag can be limited most by the hopCount fields in interest bag
Big hop count, namely after a node receives an interest bag, can judge to be according to the hopCount fields in interest bag
It is no to forward this interest bag, only just continue to forward the interest bag when the hopCount fields are not 0.
The data to match are sent to consumer node by S102, present node.
S103, present node recorded title and receiving interface corresponding to interest bag in its local PIT table, then according to
Interest is forwarded a packet to all adjacent nodes by default forwarding strategy, subsequently into S104.
It should be noted that above-mentioned default forwarding strategy is that the demand degree of urgency of resource is determined according to user, its
Including consumer node according to the size of its demand data cached come the forwarding speed to interest bag determined, forwarding speed
The size for spending the demand data cached with consumer node is inversely proportional.Specifically, when user is not urgent to resource requirement, really
Type of service corresponding to fixed is non-delay sensitive business, now forwarding of the data retrieval with forwarding strategy for selectivity, so both
It is avoided that packet ' preemptive type rob ' network traffics and causes the consumption of unnecessary resource, the possibility of network conflict, and can is done
Resource data is obtained to continuation in case of need, when user is urgent to resource requirement, it is determined that when corresponding business belongs to
Prolong sensitive traffic, now data retrieval should take efficient acquiescence forwarding strategy with forwarding strategy, efficiently to forward packet
Form meets the needs of user.
And judge whether corresponding business is promptly to have obtained the size of resource by consumer node to weigh.Namely disappear
Terminal corresponding to expense person's node understands timing scan, detection consumer node has obtained the size of field.When consumer node has obtained
When taking resource less, the value of the urgentValue fields in interest bag is entered as urgent by consumer node, now corresponding
Business is delay sensitive business, and when consumer node obtained resource it is more when, consumer node is by interest bag
The value of urgentValue fields is entered as notUrgent, non-when now corresponding business is to prolong sensitive traffic.Such as work as terminal
Detect that user is listening《Yue Fei passes》The first volume, and now downloaded completion《Yue Fei passes》First three volume content when, terminal
The business that can drafts now is changed into non-delay sensitive business from original delay sensitive business.Send again interest bag when
NotUrgent will be changed into from urgent by waiting the value of its urgentValue field, and now all nodes for receiving the interest bag all can
Know that business now has turned into non-delay sensitive business, so as to change forwarding strategy, reach and use difference according to different scenes
The purpose of forwarding strategy.
S104, adjacent node inquire about in its local cache the data for whetheing there is and matching, if the local cache of adjacent node
Then enter S106 during the data that middle presence matches, otherwise into S105.
Interest bag is transmitted to other adjacent nodes by S105, adjacent node according to the default forwarding strategy.
S106, the data to match are packaged into packet and are sent to present node by adjacent node, subsequently into S107.
Packet into its local cache, is then transmitted to consumer node by data pack buffer by S107, present node,
And the value of the urgentValue fields in interest bag redefines the value of the hopCount fields in its local PIT table.
It should be noted that when the value of the urgentValue fields in interest bag is urgent, namely business now
For delay sensitive business when, after packet is transmitted to previous requesting node by present node, present node keeps its local
The value of hopCount fields in PIT tables is constant, so as to meet user's request to greatest extent.When in interest bag
When the value of urgentValue fields is notUrgent, after packet is transmitted to previous requesting node by present node, currently
The value of hopCount fields in its local PIT table is subtracted 1 by node, so as to effectively limit network overhead.And when in PIT tables
When the value of hopCount fields is 0, corresponding present node deletes list item corresponding to the interest bag in its local PIT table.
Second embodiment
S201, intermediate node receives interest bag, subsequently into S202.
The name of above-mentioned interest bag uses with different levels naming method, and relative to the data structure increase of traditional interest bag
Two fields, respectively urgentValue fields and hopCount fields, wherein urgentValue fields are used for representing pair
The delay sensitive for the demand data answered, hopCount fields are used to represent the segments that demand data is included.
The value of urgentValue fields is urgent or notUrgent, and demand data corresponding to wherein urgent expressions is delay sensitive
Data, now the demand degree of urgency of data is higher, and demand data corresponding to notUrgent expressions is non-time-delayed sensitive data, this
When data demand degree of urgency it is relatively low.
S202, judge whether there is occurrence in local cache CS, S203 is entered when in CS without occurrence, when there is matching in CS
Enter S207 during item.
Above-mentioned steps be intermediate node after interest bag is received, search and whether there is and interest bag institute first in the CS of itself
The data item that corresponding demand data matches.
S203, corresponding list item is created in PIT tables, subsequently into S204.
Above-mentioned steps are to create the phase of the interest bag in the PIT tables of intermediate node first when occurrence in CS be present
List item is answered, so that follow-up data bag can be along backtracking.
S204, upward request point sends packet, while subtracts 1 by the value of the hopCount fields in PIT tables, Ran Houjin
Enter S205.
S205, whether the value for judging hopCount is 0, when hopCount value is not 0, into S204, when
When hopCount value is 0, into S206.
S206, record corresponding to interest bag is deleted from PIT tables.
Above-mentioned S204~S206 is packet of every transmission, subtracts 1 by the value of corresponding hopCount fields in PIT tables,
Corresponding record in PIT tables is then deleted when the value of hopCount fields in PIT tables is 0, now intermediate node no longer forwards number
According to bag, therefore it can effectively limit by the values of hopCount fields the maximum hop count of data forwarding number.
S207 judges whether there is the item matched with interest bag in PIT tables, when there is the item matched with interest bag in PIT tables,
Into S208, enter S209 when the item of indifferent to bag matching in PIT tables.
Established in S208, PIT table and recorded corresponding to interest bag and forward the interest bag, subsequently into S2010.
Added in S209, PIT table and recorded corresponding to interest bag and forward the interest bag, subsequently into S2010.
Above-mentioned S207~S209 is the process that interest bag corresponding record is stored in PIT tables, wherein it is divided into two kinds of situations, one
Kind it is that record with the interest bag name-matches is not present in PIT tables, now needs to establish a new list item, it is emerging for storing this
Recorded corresponding to interest bag；Another situation is the existing record to match with the title of the interest bag of PIT tables, now need by
Corresponding to the interest bag information such as receiving interface, which is added to, has recorded.
S2010, judge whether business corresponding to interest bag is delay sensitive business, when business is delay sensitive business
When enter step S2011, enter S2012 when business is non-delay sensitive business.
S2011, the urgentValue fields in interest bag are set to urgent and forward the interest bag.
S2012, the urgentValue fields in interest bag are set to NotUrgent and forward the interest bag.
Judge whether corresponding business is that delay sensitive business is to have obtained resource by consumer node in above-mentioned steps
Size weigh.Specifically, terminal meeting timing scan, detection consumer node have obtained resource corresponding to consumer node
Size.When consumer node obtained resource it is less when, consumer node is by the value of the urgentValue fields in interest bag
Be set to urgent, now corresponding business is delay sensitive business, and when consumer node obtained resource it is more when, consumer
The value of urgentValue fields in interest bag is set to NotUrgent by node, non-delay sensitive when now corresponding business is
Business.
Such as when terminal detects that user is listening《Yue Fei passes》The first volume, and now downloaded and completed《Yue Fei passes》
First three volume content, then the business that terminal can is drafted now is changed into non-delay sensitive industry from original delay sensitive business
Business.The value of its urgentValue field will be changed into NotUrgent from urgent when sending interest bag again, now be owned
Receiving the node of the interest bag can all know that business now has turned into non-delay sensitive business, so as to change forwarding cache plan
Slightly, the purpose according to different scenes Different Strategies is reached.
Present invention is mainly used for solve to realize that similar electronics listens the complexity of the multitone frequency file scene such as book system in VANET
In the case of data distribution problem.Imitated by the retrieval for effectively increasing data using the naming method of hierarchy to interest bag
The request success rate of rate and data.According to the difference of the demand pressing degree of data, data are entered using different forwarding strategies
Row scheduling.In addition max-forwards number is have also been devised, the propagation to redundancy interest bag has carried out prevention to a certain extent.In industry
Business is when belonging to non-delay sensitive business, using the forwarding of selectivity, has so both been avoided that packet ' preemptive type rob ' network flow
Amount, and can accomplish that continuation obtains resource data in case of need.When business belongs to delay sensitive business, using efficient
Give tacit consent to forwarding strategy, meet the needs of user in the form of efficiently forwarding packet.So that with few when demand is higher
Measuring bandwidth cost increases network speed to obtain data, saves flow through a network in the case where demand is relatively low, avoids and work as vehicle flowrate
The network congestion problem brought is possible to when increasing.
In addition, it should be understood by those skilled in the art that, embodiments of the invention can be provided as method or computer program
Product.Therefore, the form of the embodiment in terms of the embodiment of the present invention can use complete software embodiment or combine software and hardware.
Deposited moreover, the embodiment of the present invention can use to can use in one or more computers for wherein including computer usable program code
The shape for the computer program product that storage media is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
Formula.
It should also be noted that, herein, the appearance of " first ", " second ", it is only for make differentiation technical term
It is convenient with description, it should not be construed as the restriction to the embodiment of the present invention.Herein, term " comprising ", "comprising" or its
What his variant is intended to including for nonexcludability, so that process, method, article or end including a series of elements
End equipment not only includes those key elements, but also the other element including being not expressly set out, or it is this mistake also to include
Journey, method, article or the intrinsic key element of terminal device.In the absence of more restrictions, by sentence " including one
It is individual ... " limit key element, it is not excluded that also exist in the process including the key element, method, article or terminal device
Other identical element.
The preferred embodiments of the present invention are these are only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (8)
1. the Multi-audio-frequency document distribution method based on NDN in a kind of VANET, it is characterised in that comprise the following steps：
Step 1：In local cache of the present node according to the name query itself of the interest bag received at consumer node
The data that demand data corresponding with the interest bag matches are whether there is, the interest bag includes representing the demand data
First field of delay sensitive and the second field for representing the segments that the demand data is included；
Step 2：When the data to match in the local cache in the present node be present, the present node is by phase
The data matched somebody with somebody are sent to the consumer node；When the data not matched in the local cache of the present node, when
Front nodal point recorded title and receiving interface corresponding to the interest bag in its local PIT table, then according to default forwarding plan
The interest is slightly forwarded a packet into all adjacent nodes, the PIT tables include representing not yet to get in the demand data
Segments the 3rd field, the initial value of the 3rd field is the value of the second field in the interest bag；
Step 3：The adjacent node whether there is and the interest in the local cache according to the name query itself of the interest bag
The data that demand data corresponding to bag matches；
Step 4：When the data to match are not present in the local cache of the adjacent node, the adjacent node is according to institute
State default forwarding strategy and the interest bag is transmitted to other adjacent nodes；When phase being present in the local cache of the adjacent node
During the data of matching, the data to match are packaged into packet and are sent to the present node by the adjacent node；
Step 5：When the present node receives the packet, it is cached to first in the local cache of itself, then
The packet is transmitted into the consumer according to receiving interface corresponding to the interest bag recorded in its local PIT table to save
Point, and the value of the first field in the interest bag redefines the value of the 3rd field in its local PIT table.
2. the Multi-audio-frequency document distribution method based on NDN in VANET as claimed in claim 1, it is characterised in that described first
The value of field is the first numerical value or second value, wherein first numerical value represents that the demand data is time-delayed sensitive data,
The second value represents that the demand data is non-time-delayed sensitive data.
3. the Multi-audio-frequency document distribution method based on NDN in VANET as claimed in claim 2, it is characterised in that when described emerging
When the value of the first field in interest bag is the first numerical value, the packet is transmitted to described disappear by present node in the step 5
The person's of expense node, and the first field in the interest bag redefines the value of the 3rd field in its local PIT table, specifically
For：
The packet is transmitted to the consumer node by present node, and keeps the 3rd field in its local PIT table
It is worth constant；
When the value of the first field in the interest bag is second value, present node forwards packet in the step 3
To the consumer node, and the first field in the interest bag redefines the 3rd field in its local PIT table
Value, be specially：
The packet is transmitted to the consumer node by present node, and by the value of the 3rd field in its local PIT table
Subtract 1.
4. the Multi-audio-frequency document distribution method based on NDN in VANET as claimed in claim 1, it is characterised in that described default
Forwarding strategy includes：Consumer node interest bag according to determined by the size of its demand data cached
Forwarding speed, the size for the demand data that the forwarding speed has cached with the consumer node is inversely proportional.
5. the Multi-audio-frequency document distribution method based on NDN in VANET as claimed in claim 1, it is characterised in that the step
After the data to match are sent to the consumer node by present node described in two, methods described also includes：
The value of the 3rd field in its local PIT table is subtracted 1 by the present node.
6. the Multi-audio-frequency document distribution method based on NDN in the VANET as described in claim 3 or 5, it is characterised in that described
After the step of value of the 3rd field in its local PIT table is subtracted 1 by present node, methods described also includes：
When the value of the 3rd field in the local PIT tables of the present node is 0, present node is deleted in its local PIT table
List item corresponding to the interest bag.
7. the Multi-audio-frequency document distribution method based on NDN in VANET as claimed in claim 1, it is characterised in that the interest
The title of bag uses the naming method of hierarchy.
8. the Multi-audio-frequency document distribution method based on NDN in VANET as claimed in claim 7, it is characterised in that the interest
The title of bag is divided into five Primary layers, and its pattern is：Resource name/segment name/ID/timestamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711384136.7A CN107872400B (en) | 2017-12-20 | 2017-12-20 | NDN-based multi-audio file distribution method in VANET |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711384136.7A CN107872400B (en) | 2017-12-20 | 2017-12-20 | NDN-based multi-audio file distribution method in VANET |
Publications (2)
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