CN103731438B - For WSN based on range searching and the content transmission method of latency sensitive - Google Patents
For WSN based on range searching and the content transmission method of latency sensitive Download PDFInfo
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- CN103731438B CN103731438B CN201410041449.2A CN201410041449A CN103731438B CN 103731438 B CN103731438 B CN 103731438B CN 201410041449 A CN201410041449 A CN 201410041449A CN 103731438 B CN103731438 B CN 103731438B
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Abstract
The present invention propose a kind of for WSN based on range searching and the content transmission method of latency sensitive, comprise the following steps: the peripherad node of source node send request message；After node receives request message, it is judged that whether himself is content memorizer, and starts a timer；If node is content memorizer, then judge whether it has the content that request message is corresponding；If it has, then judge that this content the most all meets request message；If all met, then node is to source node feedback acknowledgment character, and otherwise, node is to source node feedback acknowledgment character and content boundaries range information；Judge whether intervalometer expires, if it is, source node chooses the minimum node of round-trip delay as destination node from receiving really read symbol and multiple nodes corresponding to content boundaries range information；Destination node is to content corresponding to source node transfer request message.Embodiments of the invention can transmit the data message that user needs efficiently.
Description
Technical field
The present invention relates to wireless sensor network transmission technique field, particularly to a kind of for WSN based on range searching
Content transmission method with latency sensitive.
Background technology
Current network environment has occurred and that more being used for of change, information and content is shared and closed compared with time at the beginning of network birth
Make, rather than be only limited to be sent to another ground from somewhere.Therefore, simple based on end-to-end addressable network access mode by
Gradually expose many inadaptable.In this context, a kind of is the Novel net that principle designs with " facilitating the access of content "
Network structure system content center network is arisen at the historic moment.
The main design goal of content center network is preferably to support current main application: content access.Because user is only
It is concerned about its required content and information, and for its storage position and transmission means, ISP(ISP) and
ICP(ICP) it doesn't matter without exception for the thing done.This target just determines the body of content center network
Architecture will not be a Conversation Model, and should be a model centered by information, and takes into account the logical of resource-sharing formula
Letter.But all of communication mode all follows certain codes and standards, therefore, the road based on content of design high efficient and flexible
Extremely urgent thing has been become by transmission technology.
Lot of domestic and international researcher proposes the method for being correspondingly improved at present, and these methods are roughly divided into two big classes: a class is advocated to set
Count brand-new network architecture, directly abandon or retain sub-fraction existing network architecture technology, but this be one difficult
Difficult and huge systems engineering, and various ideological trend confusingly gushes and rises, and whole process is the slowest；Another kind of, it is desirable to continue
Maintain existing architecture, and the most constantly improve and perfect, make whole huge network progressively towards day
Ripe and the stable direction of benefit is developed.
Summary of the invention
It is contemplated that at least solve one of above-mentioned technical problem.
To this end, it is an object of the invention to propose a kind of content transmission side based on range searching and latency sensitive for WSN
Method, the method can transmit the data message that user needs efficiently.
To achieve these goals, embodiments of the invention propose a kind of for WSN based on range searching and latency sensitive
Content transmission method, comprise the following steps: source node sends request message to node about, and in described request message
Middle setting enumerator K, wherein, K is the integer more than 0；After described node receives described request message, it is judged that it is certainly
Whether body is content memorizer, if it is not, then when described K is not 0, forward described request message to down hop, and
Described K is subtracted one, when described K is 0, no longer forwards described request message, and start a timer；If it is described
Node is described content memorizer, and the most described node checks also judges whether it has the content that described request message is corresponding；If
Described node has the content that described request message is corresponding, then determine whether that described content the most all meets described request and disappears
Breath；If described content all meets described request message, the most described node is to described source node feedback acknowledgment character, otherwise,
Described node is to described source node feedback acknowledgment character and content boundaries range information；Judge whether described intervalometer expires, and
If described intervalometer expires, the most described source node is from corresponding multiple of the described confirmation character received and content boundaries range information
Node is chosen the minimum node of round-trip delay as destination node；Described destination node transmits described request to described source node and disappears
The content that breath is corresponding.
It addition, according to the above embodiment of the present invention for WSN based on range searching and the content transmission method of latency sensitive
Can also have a following additional technical characteristic:
In some instances, described method also includes: if described node judges that himself is not as content memorizer and described K
When being 0, then abandon described request message.
In some instances, described method also includes: if described node be described content memorizer and its do not have described request
The content that message is corresponding, the most described node abandons described request message.
In some instances, described content boundaries scope includes: content type, interval value and timestamp.
In sum, according to embodiments of the present invention for WSN based on range searching and the content transmission method of latency sensitive,
Combining the characteristic distributions of content memorizer in network, the content memorizer selecting round trip delay time minimum is that user transmits its needs
Content, it is possible to transmit its data message needed for user efficiently.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become bright from the following description
Aobvious, or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage the accompanying drawings below description to embodiment will be apparent from from combining and
Easy to understand, wherein:
Fig. 1 be according to one embodiment of the invention for WSN based on range searching and the content transmission method of latency sensitive
Flow chart；And
Fig. 2 be according to one embodiment of the invention for WSN based on range searching and the content transmission method of latency sensitive
Node distribution schematic diagram.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical or
Similar label represents same or similar element or has the element of same or like function.Describe below with reference to accompanying drawing
Embodiment is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ",
Orientation or the position relationship of the instruction such as " afterwards ", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward " are base
In orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description rather than instruction or hint institute
The device that refers to or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the present invention
Restriction.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " install ", " being connected ",
" connect " and should be interpreted broadly, connect for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；Permissible
It is to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of individual element internal.For the ordinary skill in the art, can understand that above-mentioned term is in the present invention with concrete condition
In concrete meaning.
Describe the content based on range searching and latency sensitive for WSN according to embodiments of the present invention below in conjunction with accompanying drawing to pass
Transmission method.
Fig. 1 be according to one embodiment of the invention for WSN based on range searching and the content transmission method of latency sensitive
Flow chart.As it is shown in figure 1, based on range searching and latency sensitive for WSN according to an embodiment of the invention
Content transmission method, comprises the following steps:
Step S101, source node sends request message to node about, and sets enumerator K in this request message,
Wherein, K is the integer more than 0.
Specifically, in a WSN, when certain node (source node) asks certain content, because not knowing which content is deposited
Having its required content in reservoir, after therefore source node adds network, the node in certain limit about (K jumping) is sent out
Send request message, and setting enumerator K, K are the integer more than 0 in this request message.
In a concrete example, shown in Fig. 2, in fig. 2, source node is distributed about many nodes, its interior joint
01, node 02, node 04, node 05, node 06 and node 09 are content memorizer, and remaining node is common joint
Point.
Step S102, after node receives request message, it is judged that whether himself is content memorizer, if it is not, then
When K is not 0, forwarding request message is to down hop, and subtracts one by K, when K is 0, no longer forwards request message,
And start a timer.
Specifically, after certain node receives request message, first determine whether himself to be content memorizer, if it is certainly
Body is not content memorizer, and when i.e. this node is ordinary node, then when K is not 0, this ordinary node please by receive
Ask message to be forwarded directly to down hop, and K is subtracted one.Further, when K is reduced to 0, the most no longer forward above-mentioned asking
Seek message, and start a timer at this moment.
Further, in above-mentioned steps S102, if above-mentioned node judges when himself is not 0 as content memorizer and K,
Then abandon this request message.
Step S103, if above-mentioned node is content memorizer, then this node checks and judge its whether have request message pair
The content answered.In one embodiment of the invention, if above-mentioned node be content memorizer and do not have request message corresponding
Content, then this node abandons this request message.
In other words, when i.e. the node in above-mentioned steps S102 judges himself as content memorizer, then this node is sentenced further
Whether disconnected its has the content corresponding to request message that above-mentioned source node sends, the most then execution step S104, otherwise,
Abandon this request message.
Step S104, if above-mentioned node has the content that request message is corresponding, then determines whether that this content is the fullest
Foot request message.If the most above-mentioned node (content memorizer) has the content that request message is corresponding, then determine whether that this is interior
Hold the content the most corresponding with request message just the same.
Step S105, if foregoing all meets request message, then node is to source node feedback acknowledgment character, otherwise,
Node is to source node feedback acknowledgment character and content boundaries range information.Wherein, in one embodiment of the invention, content limit
Boundary's scope is a multiattribute value, such as, include: content type, interval value and timestamp.As a specific example,
The content boundaries scope sent such as certain node is: temperature/ [4,28]/[2013.06.01,2013.10.01], i.e. content class
Type is temperature, and the interval range of temperature is 4-28 DEG C, and timestamp is 2013 06 month 01 day to 2013 month October 01.
In other words, if the content having in the most above-mentioned node (content memorizer) is just the same with request content corresponding to message,
Then this node (content memorizer) replys confirmation character along reverse path to source node.If foregoing memorizer has
Content not exclusively meets the content that (part meets) request message is corresponding, then this content memorizer returns along reverse path to source node
Confirm character and the content boundaries scope having thereof again, specifically include: content type, interval value and timestamp.
Step S106, it is judged that whether intervalometer expires, and if intervalometer expire, then source node is from receiving symbol of really reading
And multiple nodes corresponding to content boundaries range information are chosen the minimum node of round-trip delay as destination node.
As a concrete example, in conjunction with Fig. 2.Specifically, it is judged that whether the intervalometer in step S101 expires, as
Really this intervalometer expires, then source node checks it to receive really to read symbol and content boundaries scope, can all meet or part is full
One or more nodes (content memorizer) of the content that foot request message is corresponding form a set, and obtain in this set each
The maximum of round-trip delay in individual node, and form table 1 below accordingly, finally, obtain the node that in table 1, round-trip delay is minimum (interior
Hold memorizer) as destination node.In conjunction with Fig. 2, table 1 can be generated as follows:
| Content memorizer set | Maximum round trip time delay |
| CS02, CS05, CS09 | 120ms |
| CS04 | 180ms |
| CS01, CS06 | 90ms |
Table 1
Node 02 that wherein, in Table 1, CS02, CS05, CS09, CS04, CS01 and CS06 are respectively in Fig. 2,
Node 05, node 09, node 04, node 01 and node 06, and these nodes are content memorizer.As known from Table 1,
The round-trip delay of CS01 and CS06 is 90ms, the round-trip delay minimum belonged in set in all of content memorizer,
Therefore, using CS01 and CS02 as destination node.
Step S107, destination node is to content corresponding to source node transfer request message.I.e. obtain by above-mentioned steps S106
The data content that needs to source node transmission user of the minimum node of round-trip delay.In other words, shown in Fig. 2 and Biao 1,
Node 01 in CS01(i.e. Fig. 2) and CS06(that is 2 in node 06) round-trip delay minimum, then with CS01 and
CS06 is as destination node, and to source node data content.
In sum, the embodiment of the present invention for WSN based on range searching and the base of the content transmission method of latency sensitive
Present principles can be summarized as: source node sends request message to surroundings nodes, and source node is after sending request message, can be one
Receive surrounding content memorizer successively in the section time really to read symbol, then source node is according to the round trip delay time of each confirmation character not
With, select (or multiple) content memorizer that round trip delay time is minimum and meets all request contents, and enter with it
Row connection establishment, to transmit the request content needed for user.
According to embodiments of the present invention for WSN based on range searching and the content transmission method of latency sensitive, combine net
The characteristic distributions of content memorizer in network, the content memorizer selecting round trip delay time minimum is that user transmits its content needed, energy
Enough data messages transmitting its needs efficiently for user.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ",
Or specific features, structure, material or the feature that the description of " some examples " etc. means to combine this embodiment or example describes comprises
In at least one embodiment or example of the present invention.In this manual, the schematic representation to above-mentioned term not necessarily refers to
It is identical embodiment or example.And, the specific features of description, structure, material or feature can at any one or
Multiple embodiments or example combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: without departing from this
These embodiments can be carried out multiple change in the case of the principle of invention and objective, revise, replace and modification, the present invention's
Scope is limited by claim and equivalent thereof.
Claims (4)
1. one kind for WSN based on range searching and the content transmission method of latency sensitive, it is characterised in that include with
Lower step:
Source node sends request message to node about, and sets enumerator K in described request message, and wherein, K is
Integer more than 0；
After described node receives described request message, it is judged that whether himself is content memorizer, if it is not, then work as institute
State K when being not 0, forward described request message to down hop, and described K is subtracted one, when described K is 0, no longer turn
Send out request message described, and start a timer；
If described node is described content memorizer, the most described node checks also judges whether it has described request message correspondence
Content；
If described node has the content that described request message is corresponding, then determine whether that described content the most all meets described
Request message；
If described content all meets described request message, the most described node along reverse path to described source node feedback acknowledgment word
Symbol, otherwise, described node along reverse path to described source node feedback acknowledgment character and content boundaries range information；
Judge whether described intervalometer expires, and if described intervalometer expire, the most described source node is from the described confirmation received
Character and multiple nodes corresponding to content boundaries range information are chosen the minimum node of round-trip delay as destination node；
Described destination node transmits, to described source node, the content that described request message is corresponding.
Method the most according to claim 1, it is characterised in that also include:
If described node judges when himself is not 0 as content memorizer and described K, then to abandon described request message.
Method the most according to claim 1, it is characterised in that also include:
If described node be described content memorizer and its do not have the content that described request message is corresponding, the most described node abandons
Described request message.
Method the most according to claim 1, it is characterised in that described content boundaries scope includes: content type, district
Between value and timestamp.
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| EP2120419A2 (en) * | 2008-05-16 | 2009-11-18 | Palo Alto Research Center Incorporated | Method and apparatus for facilitiating communication in a content centric network |
| CN102170456A (en) * | 2010-02-27 | 2011-08-31 | 华为技术有限公司 | Method, device and system for acquiring content in PPN (peer-to-peer network) |
| CN103051709A (en) * | 2012-12-20 | 2013-04-17 | 新浪网技术(中国)有限公司 | Data transmission path determination method, network node and content delivery network system |
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| US8667172B2 (en) * | 2011-06-07 | 2014-03-04 | Futurewei Technologies, Inc. | Method and apparatus for content identifier based radius constrained cache flooding to enable efficient content routing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2120419A2 (en) * | 2008-05-16 | 2009-11-18 | Palo Alto Research Center Incorporated | Method and apparatus for facilitiating communication in a content centric network |
| CN102170456A (en) * | 2010-02-27 | 2011-08-31 | 华为技术有限公司 | Method, device and system for acquiring content in PPN (peer-to-peer network) |
| CN103051709A (en) * | 2012-12-20 | 2013-04-17 | 新浪网技术(中国)有限公司 | Data transmission path determination method, network node and content delivery network system |
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