CN104754687A - Information sending method and device - Google Patents

Information sending method and device Download PDF

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Publication number
CN104754687A
CN104754687A CN201310753043.2A CN201310753043A CN104754687A CN 104754687 A CN104754687 A CN 104754687A CN 201310753043 A CN201310753043 A CN 201310753043A CN 104754687 A CN104754687 A CN 104754687A
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China
Prior art keywords
interest bag
information
node
content source
source node
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CN201310753043.2A
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CN104754687B (en
Inventor
姚春凤
胡骞
严哲峰
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Huawei Technologies Co Ltd
Beijing University of Posts and Telecommunications
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Huawei Technologies Co Ltd
Beijing University of Posts and Telecommunications
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Publication of CN104754687B publication Critical patent/CN104754687B/en
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Abstract

The embodiment of the invention provides an information sending method and device. The method comprises the steps of receiving first notification information of a content source node through a route node, wherein the first notification information includes content name, life time, signal-to-noise ratio, node free degree and hop count; acquiring a first attracting factor of the first notification information through the route node; comparing the CPT information of the node with the first notification information through the route node; if CPT meets the first condition, updating the CPU according to the first notification information, wherein the first condition includes one or more of the following items: the CPT does not include the content name of the content source node, the life time of the content name of the content source node in the CPT expires, and the second attracting factor of the content name of the content source node in the CPT is less than the first attracting factor. With the adoption of the method, the defect that the wireless network link state is not considered in the E-CHANET in the prior art can be solved, and the communication quality is improved.

Description

Method for sending information and equipment
Technical field
The present invention relates to the communication technology, particularly relate to a kind of method for sending information and equipment.
Background technology
Although Internet protocol (Internet Protocol, be called for short IP) obtain great success, promotion the Internet is ubiquitous, by " terminal " core position at the beginning of but IP is born, wrap with the IP one by one of object IP address and source IP address mark the session that carry between two terminals, therefore IP is a kind of procotol centered by terminal.
And today, people used the Internet, major function be not in order to terminal between session, but obtaining information, as the application such as Internet news, search engine, social network sites, network forum are all with the production of various information in fact, propagate and be shared as main purpose; When obtaining these information often and be indifferent to obtaining information wherefrom, this is a kind of new model centered by information/content completely newly to people.For this reason, industry proposes a kind of " network centered by information " (Information Centric Network is called for short ICN), and content/information/service is placed in the status of more core by this ICN.Further, industry is to the concept introducing Internet of Things in ICN framework.
Content center mobile ad hoc network (Content centric fashion manet, be called for short CHANET) be propose content-based route and forwarding mechanism on IEEE802.11 protocol basis, do not rely on transmission control protocol/Internet protocol (Transmission Control Protocol/Internet Protocol is called for short TCP/IP).In CHANET, requested content is named according to content designator (ContentIdentifier is called for short CID).
CHANET model is divided into two stages: a) content discovery: arbitrary subscriber equipment sends an interest bag and then finds possible content source according to the data object received; B) delivery of content: confirm that bag sends new content requests by interest, data object is passed to the routing node of specifying.Because all communication is all broadcast mode, once data packet collision or loss, 802.11 agreements can not use retransmission mechanism.All retransmission process need to complete at CHANET layer.
When the routing node in network needs to obtain certain content, utilize the broadcast characteristic of wireless network, content requests sent, the information that in network, any routing node receiving content requests bag all can be collected according to this locality, makes forwarding decision; When content provider's return data, the routing node in network can carry out the buffer memory of package level to data according to cache policy, to ensure to ensure connectedness under the scene of routing node movement, reduces the repetition flow in network simultaneously.
The defect of existing CHANET is: easily form broadcast storm, forwards non-directional.That is, in existing CHANET, utilize broadcast to carry out route, only according to CPT matching result during forwarding, if there is route entry, then forward, do not consider this routing node whether on optimal path.The whole network is broadcasted, and easily forms broadcast storm.For this reason, industry improves existing CHANET model, proposes a kind of content center multi-hop wireless networks (Enhanced Content centricmultiHop wireless NETwork is called for short E-CHANET) scheme of enhancing, in E-CHANET, add distance monitoring.
But E-CHANET adds distance monitoring in forwarding, but does not consider the impact of wireless channel conditions, because wireless network affects greatly by Link State, in information repeating process, often occurs communication failure.
Summary of the invention
For solving the problems of the prior art, the embodiment of the present invention provides a kind of method for sending information and equipment, the idle degrees of combining wireless network link status and content source node can improve communication quality in wireless network.
First aspect, the invention provides a kind of method for sending information, wherein, comprising:
Routing node receives the first advertised information of content source node, and described first advertised information comprises: the content name of described content source node, the life span of described content name, described content source node are to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node, described content source node to the jumping figure of described routing node;
Described routing node obtains the first attracting factor of described first advertised information according to described signal to noise ratio minimum value, described node free degree and described jumping figure;
The content of described routing node provides the information in information table CPT and described first advertised information to compare by described routing node, if described CPT meets first condition, then upgrades described CPT according to described first advertised information;
Wherein, described first condition comprises following one or more:
The content name of described content source node is not comprised in described CPT;
Described in described CPT, the life span of the content name of content source node is expired;
Second attracting factor of the second advertised information in described CPT is less than the first attracting factor of described first advertised information.
In conjunction with first aspect, in the first optional implementation, described first advertised information also comprises: the notice scope of described content name;
Described routing node also comprised obtain the step of the first attracting factor of described first advertised information according to described signal to noise ratio minimum value, described node free degree and described jumping figure before:
Described routing node determines that the notice scope of content name described in described first advertised information reaches maximum notice scope, then abandon described first advertised information.
In conjunction with the first optional implementation of first aspect and first aspect, in the optional implementation of the second, described routing node determines that the notice scope of content name described in described first advertised information does not reach maximum notice scope, then upgrade described first advertised information, and the first advertised information upgraded is sent to the routing node of down hop.
In conjunction with the optional implementation of the second of first aspect and first aspect, in the third optional implementation, described routing node upgrades described first advertised information, comprising:
Described routing node upgrades content source node described in described first advertised information to the signal to noise ratio minimum value of described routing node and described content source node to the jumping figure of described routing node.
In conjunction with first aspect, in the 4th kind of optional implementation, described first advertised information also comprises: the mark of content source node;
Described routing node upgrades the CPT of described routing node, comprising:
Store the first attracting factor of the mark of described content source node, the content name of described content source node, the life span of described content name and described first advertised information.
Second aspect, the invention provides a kind of method for sending information, and wherein, described method comprises:
Routing node receives a packets of information, determines that described packets of information is interest bag, when determining that described interest bag is not overtime according to the life span of described interest bag, checks whether described interest bag meets second condition;
Described routing node is when described interest bag meets second condition, and the attracting factor according to described interest bag obtains the Delay forwarding described interest bag;
Described routing node forwards described interest bag according to the Delay obtained;
Described second condition is:
The information of described interest bag is not mated in the content caching CS table of described routing node, do not mate the information of described interest bag in the resident table (PIT) of interest bag of described routing node, the content of described routing node provides in information table CPT the information having and mate described interest bag.
In conjunction with second aspect, in the first optional implementation, the mark of the content source node in described interest bag is not empty.
In conjunction with the first optional implementation of second aspect and second aspect, in the optional implementation of the second, there is the information of coupling in the CPT of described routing node, be specially:
The content name stored in described CPT is mated with the content name in described interest bag, and content source node in the mark of content source node corresponding to the content name stored in described CPT and described interest bag is marking matched.
In conjunction with second aspect, in the third optional implementation, if the content source node in interest bag be designated sky,
Then described routing node is when described interest bag meets second condition, interest bag described in delayed broadcast.
In conjunction with second aspect, in the 4th kind of optional implementation, also comprise:
When described interest bag does not meet described second condition, described routing node determines there are the data of mating described interest bag in described routing node, then to the node delay return data sending interest bag according to described CS table;
Or,
When described interest bag does not meet described second condition, according to described PIT, described routing node determines that described routing node has forwarded described interest bag, then abandon described interest bag, and reset the time-out time of interest bag described in described PIT.
In conjunction with second aspect, in the 5th kind of optional implementation, also comprise:
Described routing node adds described interest bag to described PIT.
In conjunction with second aspect and all possible implementation of second aspect, in the 6th kind of optional implementation, also comprise:
When described routing node determines described interest bag time-out according to the life span of described interest bag, abandon described interest bag.
In conjunction with the 4th kind of optional implementation of second aspect and second aspect, in the 7th kind of optional implementation, described interest handbag is drawn together: the life span of the mark of the content source node that the content name of request, described content name are corresponding, the random number of described interest bag, confirmation form, described interest bag and options;
Described routing node also comprised obtain the step of the Delay forwarding described interest bag according to the attracting factor of described interest bag before:
Determine whether described interest bag is the interest bag that described routing node repeats to receive according to the random number of described interest bag;
If the random number in another interest bag that the random number in described interest bag and described routing node received before receiving described packets of information is identical, and described routing node is not also to the return data of the node of transmission another interest bag described, and the life span of another interest bag described is not expired, then determine that described interest bag and another interest bag described repeat, abandon described interest bag;
Correspondingly, routing node, to after the node return data sending interest bag, also comprises:
According to described confirmation form and the options content source node feedback information to described data, know according to described routing node feedack the data message that described routing node returns to the node sending interest bag to make described content source node.
In conjunction with second aspect, in the 8th kind of optional implementation, described routing node obtains the attracting factor change that the Delay forwarding described interest bag follows described interest bag, and the attracting factor of described interest bag is less, then the time delay of the described interest bag of described routing node acquisition forwarding is larger.
In conjunction with second aspect, in the 9th kind of optional implementation, described method also comprises:
When described routing node determines that described packets of information is packet, when determining that described packet is not overtime according to the life span of described packet, check whether described PIT has the information of the interest bag mating described packet;
If there is the information of the interest bag mating described packet in described PIT, then detect in described packet whether carry advertised information, described advertised information is the advertised information of the content source node sending described packet;
When carrying described advertised information in described packet, upgrade described CPT according to the advertised information of carrying, and described packet is forwarded to the routing node of down hop, and delete the information of the interest bag mating described packet in described PIT.
In conjunction with the 9th kind of optional implementation of second aspect and second aspect, in the tenth kind of optional implementation, described method also comprises:
When not carrying advertised information in described packet, described packet is forwarded to the routing node of down hop, and deletes the information of the interest bag mating described packet in described PIT.
In conjunction with the 9th kind of optional implementation of second aspect and second aspect, in the 11 kind of optional implementation, described method also comprises:
When not mating the information of the interest bag of described packet in described PIT, abandon described packet.
In conjunction with second aspect and second aspect the 9th to the 11 kind of possible implementation, in the 12 kind of optional implementation, described method also comprises:
When determining described packet time-out according to the life span of described packet, abandon described packet.
In conjunction with the 9th kind of optional implementation of second aspect and second aspect, in the 13 kind of optional implementation, described packet comprises: the life span of described packet, the mark of content source node, content source node are to signal to noise ratio minimum value, the node free degree of content source node, the data of described content source node, the segment information of described data of described routing node.
The third aspect, the invention provides a kind of routing device, and wherein, described equipment comprises:
Receiving element, for receiving the first advertised information of content source node, described first advertised information comprises: the content name of described content source node, the life span of described content name, described content source node are to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node, described content source node to the jumping figure of described routing node;
Attracting factor generation unit, for obtaining the first attracting factor of described first advertised information according to described signal to noise ratio minimum value, described node free degree and described jumping figure;
Comparing unit, compares for the content of described routing device being provided the information in information table CPT and described first advertised information;
Updating block, for after described comparing unit is relatively, described CPT meets first condition, then upgrade described CPT according to described first advertised information;
Wherein, described first condition comprises following one or more:
The content name of described content source node is not comprised in described CPT;
Described in described CPT, the life span of the content name of content source node is expired;
In described CPT, the second attracting factor of the second advertised information is less than described first attracting factor.
In conjunction with the third aspect, in the first optional implementation, described first advertised information also comprises: the notice scope of described content name; Described routing device also comprises:
Determining unit, before generating the first attracting factor at described attracting factor generation unit, determines whether the notice scope of content name described in described first advertised information reaches maximum notice scope;
Discarding unit, during for determining that the notice scope of content name described in described first advertised information reaches maximum notice scope in described determining unit, abandons described first advertised information.
In conjunction with the first optional implementation of the third aspect and the third aspect, in the optional implementation of the second, described updating block, also for
When described determining unit determines that the notice scope of content name in described first advertised information does not reach maximum notice scope, upgrade described first advertised information;
Described routing device also comprises: transmitting element;
Described transmitting element, the first advertised information also for being upgraded by described updating block is sent to the routing device of down hop.
In conjunction with the optional implementation of the second of the third aspect and the third aspect, in the third optional implementation, described updating block, specifically for, when described determining unit determines that the notice scope of content name in described first advertised information does not reach maximum notice scope, upgrade the signal to noise ratio minimum value in described first advertised information and jumping figure.
In conjunction with the third aspect, in the 4th kind of optional implementation, described first advertised information also comprises: the mark of content source node;
Described updating block, specifically for after described comparing unit relatively, described CPT meets first condition, then in described CPT, store the first attracting factor of the mark of described content source node, the content name of described content source node, the life span of described content name and described first advertised information according to described first advertised information.
Fourth aspect, the invention provides a kind of routing device, and wherein, described equipment comprises: receiving element, for receiving a packets of information;
First judging unit, for judging that the packets of information that described receiving element receives is interest bag or packet;
Second judging unit, for when described first judging unit determines that described packets of information is interest bag, judges that whether the life span of described interest bag is overtime;
3rd judging unit, during for determining that at described second judging unit the life span of described interest bag is not overtime, judges whether described interest bag meets second condition;
Acquiring unit, for when described 3rd judging unit determines that described interest bag meets second condition, the attracting factor according to described interest bag obtains the Delay forwarding described interest bag;
Transmitting element, the Delay for obtaining according to described acquiring unit forwards described interest bag;
Described second condition is:
The information of described interest bag is not mated in the content caching CS table of described routing device, do not mate the information of described interest bag in the resident table (PIT) of interest bag of described routing device, the content of described routing device provides in information table CPT the information having and mate described interest bag.
In conjunction with fourth aspect, in the first optional implementation, described second judging unit is also for determining whether the mark of the content source node in described interest bag is empty;
Determine that the mark of the content source node in described interest bag is not for time empty, judges that whether the life span of described interest bag is overtime at described second judging unit.
In conjunction with the first optional implementation of fourth aspect and fourth aspect, in the optional implementation of the second, there is the information of mating described interest bag in the CPT of described routing device, be specially:
The content name stored in described CPT is mated with the content name in described interest bag, and content source node in the mark of the content source node of the content name correspondence stored in described CPT and described interest bag is marking matched.
In conjunction with the first optional implementation of fourth aspect and fourth aspect, in the third optional implementation, if what described second judging unit determined content source node in described interest bag is designated sky, and determining that the life span of described interest bag is not overtime, and described 3rd judging unit determines that described interest bag meets second condition, then described routing device also comprises: radio unit;
Described radio unit, for interest bag described in delayed broadcast.
In conjunction with fourth aspect, in the 4th kind of optional implementation, when described 3rd judging unit determines that described interest bag does not meet described second condition,
Described routing device also comprises:
4th judging unit, for determining according to CS table the data whether having coupling in described routing device;
Described transmitting element, also for determining there are the data of mating described interest bag in described routing device, then to the equipment time delay return data sending interest bag at described 4th judging unit according to CS table;
Or,
Described routing device also comprises:
According to described PIT, 5th judging unit, for determining whether described routing device has forwarded described interest bag very much;
Discarding unit, for determining that described routing device has forwarded described interest bag at described 5th judging unit, then abandons described interest bag;
Updating block, after abandoning described interest bag in described discarding unit, resets the time-out time of interest bag described in described PIT.
In conjunction with fourth aspect, in the 5th kind of optional implementation, described routing device also comprises: adding device, for described interest bag is added into described PIT.
In conjunction with all possible implementation of fourth aspect and fourth aspect, in the 6th kind of optional implementation, described routing device also comprises:
Discarding unit, during for determining that at described second judging unit the life span of described interest bag is overtime, abandons described interest bag.
In conjunction with fourth aspect, in the 7th kind of optional implementation, described interest handbag is drawn together: the life span of the mark of the content source node that the content name of request, described content name are corresponding, the random number of described interest bag, confirmation form, described interest bag and options.
In conjunction with fourth aspect, in the 8th kind of optional implementation, described routing device also comprises:
According to the life span of described packet, 6th judging unit, for when described first judging unit determines that the packets of information that described receiving element receives is packet, determines that whether described packet is overtime;
7th judging unit, during for determining that at the 6th judging unit described packet is not overtime, determines the information whether having the interest bag mating described packet in described PIT;
Detecting unit, for determining at described 7th judging unit the information having the interest bag mating described packet in described PIT, then detect in described packet and whether carry advertised information, described advertised information is the advertised information of the content source node sending described packet;
Updating block, during for determining to carry advertised information in described packet at described detecting unit, upgrades described CPT according to the advertised information of carrying;
Described transmitting element, also for described packet being forwarded to the routing device of down hop;
Delete cells, after sending described packet at described transmitting element, deletes the information of the interest bag mating described packet in described PIT.
In conjunction with the 8th kind of optional implementation of fourth aspect and fourth aspect, in the 9th kind of optional implementation, discarding unit;
Described discarding unit, for when described 7th judging unit determines the information of the interest bag not mating described packet in described PIT, abandons described packet.
In conjunction with the 9th kind of optional implementation of fourth aspect and fourth aspect, in the tenth kind of optional implementation, described discarding unit, time also for determining the life span time-out of described packet at described 6th judging unit, abandons described packet.
In conjunction with the 8th, nine, ten any one optional implementations of fourth aspect and fourth aspect, in the 11 kind of optional implementation, described packet comprises: the life span of described packet, the mark of described content source node, the data of described content source node to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node, described content source node, the segment information of described data.
As shown from the above technical solution, the method for sending information of the present embodiment and the technique effect of equipment are: receive the first advertised information at routing node, the first attracting factor of the first advertised information can be obtained, and then after the information in the CPT of routing node compares with the first advertised information, CPT can be made according to the first condition of comparative result, then can upgrade CPT according to the first advertised information, make routing device can carry out classification process according to the CPT upgraded to interest bag and packet, realize the idle degrees considering wireless network links state and content source node in packets of information processing procedure, and then the communication quality that improve in wireless network.
Accompanying drawing explanation
Fig. 1 is the diagram of protocol architecture of current CHANET;
Fig. 2 is the structure chart of current content designator;
The schematic flow sheet of the method for sending information that Fig. 3 A and Fig. 3 B provides for one embodiment of the invention;
The scene graph of the method for sending information that Fig. 4 A provides for another embodiment of the present invention;
The schematic flow sheet of the method for sending information that Fig. 4 B provides for another embodiment of the present invention;
The scene graph of the method for sending information that Fig. 5 A provides for another embodiment of the present invention;
The schematic flow sheet of the method for sending information that Fig. 5 B and Fig. 5 C provides for another embodiment of the present invention;
The schematic flow sheet of the method for sending information that Fig. 6 A and Fig. 6 B provides for another embodiment of the present invention;
The structural representation of the routing device that Fig. 7 provides for one embodiment of the invention;
The structural representation of the routing device that Fig. 8 provides for another embodiment of the present invention;
The structural representation of the routing device that Fig. 9 provides for another embodiment of the present invention.
Embodiment
Existing content center network (Content Centric Networking, be called for short CCN) be based on content-based name and route, adopt URL(uniform resource locator) (Uniform Resource Locator, be called for short URL) similar structured content name, realize caching function in the router.Transmitting by the longest matched and searched determination down hop of content name to content name prefix of router.NDN(Named Data Network is adopted in CHANET) technical conceive of router networking, realize the forwarding of content information under wireless scene.
The protocol infrastructure of CHANET as shown in Figure 1, comprises Access Layer, content center layer and application layer.Wherein, in CHANET, requested content is named according to content designator (Content Identifier is called for short CID), and the size according to content splits by content (Content), block (Chunk), bag (Packet) three ranks.
Current E-CHANET is the further improvement to CHANET, and the embodiment of the present invention is mainly for the further improvement communicated in E-CHANET.
Current, under the wireless scenes of internet of things of E-CHANET, interest Packet forwarding process does not arrive the impact considering network link status.Cause as a result, interest Packet forwarding is to the place of network condition difference (Link State unstable), cause communication failure.
The embodiment of the present invention is mainly for information centre's network (Information Centric Network, be called for short ICN) under wireless scenes of internet of things, content-data is split as M data block (chunk), each piece is divided into again N number of packet (packet), each interest bag request data block, i.e. a corresponding N number of packet of interest bag.(should illustrate, as N=1, i.e. 1 corresponding 1 packet of interest bag; As M=1, i.e. 1 corresponding all packet of interest bag).In wireless Internet of Things, all routing nodes have unique mark.Above-mentioned M, N be greater than zero natural number.
3 kinds of information are related to, interest package informatin (Interest), packet information (Data), advertised information (Advertise) in the communication process of wireless Internet of Things.
The packet format of interest bag is as following table one, and the packet format of packet is as following table two, and the packet format of advertised information is as following table three.
Table one:
Content name
Random number
Life span (TTL)
The mark (Provider ID) of content source node
Confirmation form
Options
Table two:
In table two, the content that thickened portion newly increases for the packet used in the embodiment of the present invention.Usually, only can stablize and provide the data source of data certain hour just can be identified as to be stable data source, just can be routed node and to put into routing table.In the information process of transmitting of concrete routing node, can provide the data source of a certain amount of packet, if provide the data source of section (block) data, last bag of this section is considered to tail packet.Potential data source information is carried in this packet.
Table three:
Wherein, table three is the form of the advertised information of the embodiment of the present invention.
Three of relating in information repeating process on routing node store the table of different information, content caching (Content Store respectively, be called for short CS) table, interest bag resident tables (Pending InterestTable, be called for short PIT), content provides information table (Content Provider Table is called for short CPT).
Wherein, the local cache information stored in CS table.The information of the interest bag that memory resident is requested in PIT.CPT can be regarded as routing table, represents whether the content name in advertised information or the content name in interest bag exist route at this routing node.The structure of CPT is as following table four:
Table four:
Content name Provider ID Attracting factor A Time-out time
The communication process of wireless Internet of Things can comprise: the announcement process of advertised information, interest bag processing procedure and processing data packets process, and concrete announcement process and the processing procedure of packets of information are as the description of following each embodiment.
Embodiment one
Fig. 3 A shows the schematic flow sheet of the method for sending information that one embodiment of the invention provides, and as shown in Figure 3A, the method for sending information of the present embodiment comprises following content.
301, routing node receives the first advertised information of content source node, first advertised information comprises: the content name of content source node, life span (the Time To Live of content name, be called for short TTL), content source node is to the node free degree of signal to noise ratio (Signal to Noise Ratio, the abbreviation SNR) minimum value of routing node, content source node, content source node to the jumping figure of routing node.
Should illustrate, the SNR minimum value that the routing node that the SNR minimum value in advertised information can be regarded as content source node or the forwarding advertised information directly sending advertised information is determined according to Link State.SNR is less, and Link State is more bad.Such as, the advertised information that routing node A in Fig. 4 A receives is that content source node directly sends, then the SNR minimum value in this advertised information, can be content source node that content source node the determines SNR minimum value to routing node;
The advertised information that routing node B receives is that routing node A forwards, then a minimum value in the SNR between the content source node that the SNR minimum value in this advertised information can be SNR between routing node A to routing node B that routing node A determines, content source node is determined to routing node A.
302, routing node obtains the first attracting factor of the first advertised information according to signal to noise ratio minimum value, node free degree and the jumping figure in the first advertised information.
Will be understood that, attracting factor (attractive factor): be used for representing the attraction power of certain content source node to content requests, relevant with signal to noise ratio minimum value, node free degree (L), jumping figure (H) etc.
303, the information in the CPT of routing node and the first advertised information compare by routing node, if CPT meets first condition, then upgrade the CPT of routing node according to the first advertised information;
Wherein, described first condition comprise following in one or more:
The content name of described content source node is not comprised in described CPT;
Described in described CPT, the life span of the content name of content source node is expired;
Second attracting factor of the second advertised information in described CPT is less than described first attracting factor.
Second attracting factor at this place is the attracting factor of other advertised information (as the second advertised information) of the content source node stored before this routing node receives this first advertised information.
It should be noted that content source node regularly can send advertised information, upgrade to make each routing node in network the advertised information stored in this routing node.
Alternatively, the first advertised information in abovementioned steps 301 also can comprise: the notice scope of content name; Correspondingly, before aforesaid step 302, method for sending information also comprises the following step 301a shown in Fig. 3 B and 301b;
301a: described routing node determines that the notice scope of content name in described first advertised information reaches maximum notice scope, then abandon described first advertised information;
301b, described routing node determine that the notice scope of content name in described first advertised information does not reach maximum notice scope, then upgrade described first advertised information, and the first advertised information upgraded is sent to the routing node of down hop.
It should be noted that in wireless scene, aforesaid notice scope can be limited by the maximum hop count of content source node in advertised information to routing node.The notice scope of content name can set according to the network scenarios of reality.
In addition, the routing node that the first advertised information is sent to down hop by routing node can adopt the mode of broadcast, receives the first advertised information after the renewal of above-mentioned broadcast to make other routing nodes in communication range.
For example, in step 301b, routing node upgrades described first advertised information and can comprise:
Routing node upgrades content source node in described first advertised information to the signal to noise ratio minimum value of routing node and content source node to the jumping figure of routing node.
Alternatively, obtain the first attracting factor in aforesaid step 302 can specifically comprise:
The first attracting factor A of described first advertised information is obtained according to following formula (1);
A=α×f(SNR)+β×g(L)-γ×h(H) （1）
Wherein, the span of α, β, γ can be arranged according to actual needs; α is the coefficient of SNR, is used for reflecting radio network information channel performance; β is the coefficient of content source node free time degree; γ is the coefficient that content source node arrives the jumping figure of routing node.
L=T x/ R x, T xfor sending the transmission rate of content source node, R xfor the receiving velocity of content source node.In the present embodiment, L is node free degree, for representing busy extent or the idle degrees of content source node; H is jumping figure.
Channel condition in wireless network is better, content source node is more idle, routing node distance content source node is nearer, then the first attracting factor of the advertised information of the content source node of routing node acquisition is larger, and then in routing node, the chance of the content of interest bag acquisition content source node is larger.
In concrete application process, the first advertised information in aforesaid step 301 also can comprise: the mark of content source node;
Now, the routing node in aforesaid step 303 upgrades the CPT of routing node, can be specially:
Described routing node stores the first attracting factor of the mark of described content source node, the content name of content source node, the life span of content name and the first advertised information in CPT.
Alternatively, on the basis of aforesaid method for sending information, also can comprise following not shown step S01:
If S01, routing node receive the second advertised information, determine that the mark of content source node in described second advertised information is identical with the mark of content source node in the first advertised information, then according to described first condition, determine whether the CPT needing to upgrade described routing node;
Otherwise, in the second advertised information, the mark of content source node is with when in the first advertised information, the mark of content source node is not identical, mode with reference to above-mentioned Fig. 3 A directly obtains the first attracting factor of the first advertised information, and then determines whether according to first condition the CPT needing renewal routing node.
In addition, in the present embodiment, buffer memory is not noticed, and adopts listening mode.Buffer memory is understandable that: the first advertised information after receipt, can be stored in advance in routing node, and then show that this routing node has the path to this content, but due to this routing node finite energy, therefore not as via node, namely no longer continue to send this notice message to other surroundings nodes.Just monitor the interest bag whether periphery has request first advertised information.Just process according to the interest bag handling process shown in following embodiment if had, when data return, carry information first advertised information described above of content source node in the packet, and then reach the object of notice.Shown in Fig. 5 C described as follows.
The technique effect of the method for sending information in the present embodiment is: by the wireless scenes of internet of things of E-CHANET, increase the repeating process of advertised information, realize each routing node in E-CHANET and can obtain the information of up-to-date content source node, and then can forward in time or return data when discovery interest bag, reduce forwarding time and the hop count of interest bag, reduce the number of times of communication failure.
In addition, the method that above-mentioned information forwards is more suitable for the route discovery mechanisms of wireless scenes of internet of things, make the data source that newly adds and content source node content source node can be found by notice, and then make each routing node in network obtain the information of content source node, in conjunction with the wireless link condition in advertised information and content source node idle degrees information, the mode that packets of information carries out through this routing node processing can be realized.
Embodiment two
Fig. 4 A shows the scene graph of the method for sending information that another embodiment of the present invention provides, and Fig. 4 B shows the schematic flow sheet of the method for sending information that another embodiment of the present invention provides, and as shown in Figure 4 A and 4 B shown in FIG., the method for sending information of the present embodiment is as described below.
401, routing node receives the first advertised information of content source node, and described first advertised information comprises: the content name of content source node, the life span of content name, content source node are to signal to noise ratio minimum value, the node free degree of content source node, the jumping figure of content source node to routing node, the mark of content source node of routing node.
402, routing node calculates the first attracting factor of the first advertised information according to the signal to noise ratio minimum value in the first advertised information, node free degree, jumping figure;
403, information in CPT and the first advertised information compare by routing node, determine the information record of the identical content whether had in described CPT from same content source node; If have, then perform step 404, otherwise, perform step 404a.
Such as, according to the mark of content source node and the content name of content source node, determine the information record of the identical content whether had in CPT from same content source node.
404a, routing node determine the information record of the content not having foregoing source node in CPT, then upgrade CPT according to the first advertised information, the first advertised information by foregoing source node is stored in CPT.
404, after step 403, routing node determines the information record of the identical content had in CPT from same content source node, then determine that whether the life span of the content name in the CPT of routing node is expired, if, then perform step 405a, otherwise, perform step 405.
The life span of the content name in the CPT of 405a, routing node determination routing node is expired, then upgrade CPT according to described first advertised information, the first advertised information by foregoing source node is stored in CPT.
405, in step 404, the life span of the content name in the CPT of routing node determination routing node does not have expired, then whether the first attracting factor obtained in determining step 402 is larger than the second attracting factor in former CPT, if, perform step 406a, otherwise, perform step 406.
Second attracting factor is the attracting factor of the second advertised information of the same content source node stored in the CPT of routing node.
Should illustrate, aforesaid step 402 calculates before can being placed on step 405, and the present embodiment is only and illustrates, gets the first attracting factor before step 405.
If the first attracting factor in 406a step 405 is greater than the second attracting factor, then determine that there is more excellent content source in the notice path that the first advertised information is corresponding, then upgrade CPT according to described first advertised information, the first advertised information by foregoing source node is stored in CPT.
If the first attracting factor in 406 steps 405 is less than or equal to the second attracting factor, then determine the notice scope whether the notice scope of content name in the first advertised information reaches maximum, if so, perform step 407a, otherwise, perform step 407.
407a, in a step 406, routing node determines that the notice scope of content name in the first advertised information reaches maximum notice scope, then abandon the first advertised information, terminates.
407, in a step 406, routing node determines that the notice scope of content name in the first advertised information does not reach maximum notice scope, then, upgrade the first advertised information, as upgraded the signal to noise ratio minimum value and jumping figure etc. of content source node to routing node, the first advertised information after renewal is sent to the routing node of down hop, namely down hop continues to notice.
The technique effect of the method for sending information of the present embodiment is: by the wireless scenes of internet of things of E-CHANET, increase the repeating process of advertised information, realize each routing node in E-CHANET and can obtain the information of up-to-date content source node, and then can forward in time or return data when discovery interest bag, reduce forwarding time and the hop count of interest bag, reduce the frequency of failure of communication.
In addition, the method for sending information of the present embodiment considers wireless network links characteristic and content source node idle degrees, and follow-up packets of information can be enable to be routed to the good direction of link circuit condition.
Embodiment three
Fig. 5 A shows the scene graph of the method for sending information that another embodiment of the present invention provides, and Fig. 5 B shows the schematic flow sheet of the method for sending information that another embodiment of the present invention provides, and as fig. 5 a and fig. 5b, the method for sending information of the present embodiment is as described below.
501, routing node receives a packets of information, determines that described packets of information is interest bag, when determining that described interest bag is not overtime according to the life span of described interest bag, checks whether described interest bag meets second condition;
502, described routing node is when described interest bag meets second condition, and the attracting factor according to described interest bag obtains the Delay forwarding described interest bag;
503, described routing node forwards described interest bag according to the Delay obtained;
Described second condition is: do not have the information of mating in the CS table of described routing node, do not have the information of mating, have the information of coupling in the CPT of described routing node in the PIT of described routing node.
Should illustrate: there is no the information of mating in CS table, refer to the information of not mating completely.
In the present embodiment, the information of coupling is had to refer in CPT: the content name stored in CPT and the content name coupling in interest bag and consistent, and the mark (i.e. content provider information) of the content source node of the content name correspondence stored in CPT also with the mating of the mark of the content source node in interest bag, then forward according to above-mentioned steps 503.
In the present embodiment, routing node obtains the attracting factor change that the Delay forwarding described interest bag follows described interest bag, and the attracting factor of described interest bag is less, then the time delay of the described interest bag of described routing node acquisition forwarding is larger.
In the optional scene of one, if the content name stored in CPT is mated with the content name in interest bag, the mark of the content source node that the content name stored in CPT is corresponding is not mated with the mark of the content source node in interest bag, now, routing node is then determined whether the attracting factor in interest bag is greater than in the CPT of router and is stored attracting factor corresponding to consistent content name, if so, then the relevant information of the content source node stored in CPT is updated to the relevant information of the content source node in interest bag.
Certainly, routing node is then determined that the attracting factor in interest bag is not more than in the CPT of router and is stored attracting factor corresponding to consistent content name, then the switching of the content source node in the CPT of routing node does not occur.
Certainly, in a particular application, the method that above-mentioned information forwards also can comprise following content:
A kind of possibility situation be: when interest bag does not meet described second condition, and described routing node determines there are the data of coupling in described routing node, then to the node delay return data sending interest bag according to CS table.Thus, effectively can prevent two routing nodes from sending packet to the routing node sending interest bag simultaneously, and then the collision under wireless scenes of internet of things can be reduced.
Another kind of possibility situation be: when described interest bag does not meet described second condition, according to PIT, described routing node determines that described routing node has forwarded described interest bag, then abandon described interest bag, and reset the time-out time of interest bag described in described PIT.
It should be noted that the mark of the content source node in above-mentioned interest bag is not for empty.
Alternatively, if the content source node in interest bag be designated sky, then described routing node is when described interest bag meets second condition, interest bag described in delayed broadcast.This place's time delay is the time that routing node can arrange delayed broadcasting according to actual needs.
That above-mentioned method for sending information also can comprise following not shown step 504 and/or step 505 at embody rule.
504, described routing node adds described interest bag to PIT.
505, when described routing node determines described interest bag time-out according to the life span of described interest bag, described interest bag is abandoned.
Aforesaid interest bag can comprise: the mark of the content source node that the content name of request, content name are corresponding, the random number of interest bag, confirmation form, the life span of interest bag, options.
Now, described routing node is according to before the step of the Delay of the described interest bag of attracting factor acquisition forwarding of described interest bag (namely before step 502), and method for sending information also can comprise following not shown step N01 and step N02.
N01, to determine according to the random number of described interest bag whether described interest bag is the interest bag that routing node repeats to receive;
If the random number in another interest bag that the random number in N02 described interest bag and described routing node received before receiving described packets of information is identical, and described routing node is not also to the return data of the node of transmission another interest bag described, and the life span of another interest bag described is not expired, then determine that described interest bag and another interest bag described repeat, abandon described interest bag;
Alternatively, draw together at interest handbag: when confirmation form and options, the routing node in above-mentioned method for sending information, to after the node return data sending interest bag, also can comprise following not shown step name M01:
M01, routing node, according to described confirmation form and the options content source node feedback information to described data, know according to described routing node feedack the data message that described routing node returns to the node sending interest bag to make described content source node.Thus, content source node can be realized can retransmit not having received data.
That is, the random number of interest bag is used to judge whether that repetition interest bag arrives same routing node, if received similar interest bag before this routing node, and the random number of carrying in interest bag is consistent, and the routing node sending interest bag does not also obtain the data returned, there is no time-out, then think that the interest bag received specifically is one and repeats interest bag, can abandon yet.
The method for sending information of the present embodiment considers wireless network links characteristic and content source node idle degrees, interest is wrapped in routing procedure and can be routed on the good direction of link circuit condition, and then effectively can improve the communication quality of wireless network.
Fig. 5 C shows the schematic flow sheet of the method for sending information that another embodiment of the present invention provides, and as shown in Figure 5 C, the method for sending information of the present embodiment is as described below.
510, routing node receives a packets of information, when described routing node determines that described packets of information is packet, when determining that described packet is not overtime according to the life span of described packet, checks whether described PIT has the information of the interest bag mating described packet;
511, routing node is determining the information having the interest bag mating described packet in described PIT, then detect in described packet whether carry advertised information, and described advertised information is the advertised information of the content source node sending described packet;
512, when routing node carries advertised information in described packet, upgrade CPT according to the advertised information of carrying, and described packet is forwarded to the routing node of down hop, and delete the information of the interest bag mating described packet in described PIT.
In the present embodiment, when packet returns, the packet returned can be utilized to carry advertised information, reach the object of route discovery and notice.Such advantage is as follows: 1) for the data source nodes (i.e. content source node) of limited energy, be unsuitable for periodic announcement operations, therefore, this category node adopts listening mode usually, when listening to the content that self can provide, can return data bag, simultaneously by additional for the information of notebook data source node in the packet, reached the object that data source nodes is found; 2) utilize packet to carry advertised information, also can reduce the quantity of the advertised information in network, reduce the effect of network traffics, reduce broadcast storm.
Alternatively, above-mentioned method for sending information also can comprise not shown step 512a to step 514:
512a: when not carrying advertised information in described packet, described packet can be forwarded to the routing node of down hop by routing node, also can delete the information of the interest bag mating described packet in described PIT.
513, when routing node does not mate the information of the interest bag of described packet in described PIT, described packet is abandoned.
514, when routing node determines described packet time-out according to the life span of described packet, described packet is abandoned.
For example, packet in the present embodiment can comprise: the life span of packet, the mark of content source node, content source node to signal to noise ratio minimum value, the node free degree of content source node, the data of content source node of routing node, the segment information of described data.
Segment information in packet can be regarded as: a content can be divided into some sections, each section can be divided into some bags again, segmentation position and the Data Position at data place is carried in each packet, as second segment the 1st wraps, and follow-up interest bag can carry out feedback acknowledgment table (MAP) for the reception condition of a certain section, namely unnecessary the MAP of all reception conditions is fed back, because it is more to receive data, feedback information is easily larger.
Data in packet can be regarded as: the content of the request that the interest bag corresponding with packet is specified; Data source nodes is by this data content, and encapsulation returns to the node sending interest bag in the packet.
The technique effect of the method for sending information in the present embodiment is: said method achieves more fully routing forwarding strategy, introduce attracting factor simultaneously, the busy extent of wireless link condition and routing node in wireless network can be reacted preferably, and then realize auxiliary forwarding, be forwarded to Link State good, distance is closer to data source nodes, and the direction that the busy degree of node is low, and then improves the communication quality in wireless network.
The forwarding of above-mentioned advertised information can make the content source node of energetic do initiatively to notice, and the passive content source node of energy, in the passive notice of limited routing node, makes notice scope more reasonable.
In addition, the Forwarding Delay self adaptation of above-mentioned packet/interest bag, can realize at optimal path, the good path of Link State, routing node upper pathway Forwarding Delay that idle degree is high little.Such as, on the direction that network condition is good, distance is near, resource is more abundant, the Forwarding Delay of packets of information is little; Otherwise it is then large.
Embodiment four
In the present embodiment, subscriber equipment according to the information in CPT, can select optimum content provider, if need to ensure higher reliability, multiple content provider can be selected simultaneously, the information of multiple content provider is added in interest bag, send interest bag.
Can comprise in interest bag: the content name of request, the mark (preferred ID) of content source node, the random number of interest bag, confirmation form, the information such as the life span of interest bag.
For the situation of mark of not knowing content source node, in interest bag, Preferred ID and confirmation form can be empty, explore route for realizing.
Middle routing node, for the forwarding of interest bag, can carry out delay forwarding according to calculating the attracting factor obtained.
Fig. 6 A and Fig. 6 B shows the schematic flow sheet of the method for sending information that another embodiment of the present invention provides, and as shown in Figure 6 A and 6 B, the method for sending information of the present embodiment is as described below.
600, middle routing node receives a packets of information.
601, determine that described packets of information is packet or interest bag, if described packets of information is interest bag, perform following step 602 to step 607(as shown in Figure 6A), otherwise, when determining that described packets of information is packet, perform following step 610 to step 613(as shown in Figure 6B).
602, in step 601, routing node determines that described packets of information is interest bag, then determine that whether described interest bag is overtime according to the life span of interest bag, if overtime, performs step 603a, otherwise performs step 603.
603a, in step 602, during routing node determination interest bag time-out, abandons described interest bag.
603, in step 602, routing node determination interest bag is not overtime, judges whether there is the information of mating described interest bag in CS table, if had, then performs step 604a, otherwise, perform step 604.
604a, in step 603, routing node determines there is the information of mate described interest bag in CS table, then node (as the subscriber equipment) time delay to transmission interest bag returns the data corresponding with interest bag.
In the present embodiment, time delay return data is to prevent collision, if multiple routing node sends packet simultaneously, then likely colliding, make the node of transmission interest bag such as subscriber equipment parse.Because in wireless network, Signal transmissions is shared wireless channel.
Alternatively, before step 602, also comprise: according to the random number of the interest bag in interest bag, routing node judges that whether this interest bag is the interest bag of the repetition that this routing node receives.If so, described interest bag is abandoned, otherwise, perform step 602.
It should be noted that, the random number of interest bag be routing node (this routing node is the node of bag of becoming interested) become interested bag time produce at random, after an interest bag forwards from arbitrary routing node, this random number can be routed nodes records, if this routing node follow-up receives the interest bag comprising this random number again, then think that this is an interest bag processed.Think the interest bag of repetition.
604, in step 603, routing node determines the information of not mating described interest bag in CS table, then check in PIT the information whether having and mate described interest bag, if had, then performs step 605a, otherwise, perform step 605.
605a, in step 604, routing node determines there is the information of mating described interest bag in PIT, then determine that described interest bag was forwarded, then reset time-out time corresponding with interest bag in PIT, abandon described interest bag, no longer forward described interest bag.
605, in step 604, routing node determines the information of not mating described interest bag in PIT, then check in CPT the information whether having and mate described interest bag, if having, then performs step 606a, otherwise, perform step 606.
606a, in step 605, routing node determines there is the information of mating described interest bag in CPT, then obtain according to the attracting factor of interest bag the Delay forwarding described interest bag, and then routing node forwards described interest bag according to the Delay obtained, and upgrade PIT.
For example, distance is nearer, channel status better, routing node is more idle, then obtain according to the attracting factor of interest bag the Delay forwarding described interest bag less, and then the time delay forwarding interest bag is less.
Such as, at optimal path, the path that link is good, leading to the routing node on idle content source node path, should reduce time delay, fast-forwarding.Because the object of time delay is to prevent the collision in wireless network from occurring, and then when increasing random delay, can obtain random delay scope just little, the random delay scope namely produced is just little, then the random delay produced is just little.(such as, for optimal path, the random delay of 0 ~ 10ms can be got, for other non-shortest paths, then can get the time delay of 0 ~ 100ms).
Above-mentioned routing node can complete the switching of content source node pellucidly according to the attracting factor calculated.
606, in step 605, routing node determines the information of not mating described interest bag in CPT, judges that whether the mark of the content source node in interest bag is empty, if the content source node in interest bag be designated sky, then perform step 607, otherwise perform step 607a.
607, determine in step 606 the content source node in interest bag be designated sky time, routing node forwards described interest bag by broadcast mode, such as, can interest bag described in delayed broadcast, and upgrade PIT.
607a, determine the content source node in interest bag in step 606 mark for time empty, abandon described interest bag.
As shown in Figure 6B, 610, in step 601, routing node determines that described packets of information is packet, then determine that whether described packet is overtime according to the life span of packet, if overtime, perform step 611a, otherwise perform step 611.
611a, in step 610, during the life span time-out of routing node determination packet, abandons described packet.
611, in step 610, the life span of routing node determination packet is not overtime, then check in described PIT the information whether having and mate described packet, if having, performs step 612, otherwise, perform step 612a.
612a, in step 611, routing node determines the information of not mating described packet in PIT, then illustrate, the interest bag that this routing node does not have forwarded over packet corresponding, or the interest bag of this routing node is responded, obtain data feedback, and then abandon described packet.
612, in step 611, routing node determines there is the information of mating described packet in PIT, then detect in packet whether carry advertised information, if having, then performs step 613, otherwise, perform step 613a.
613, in step 612, in routing node determination packet, carry advertised information, then upgrade CPT according to the advertised information of carrying, and packet is forwarded to the routing node of down hop, and delete the information of mating in described PIT.
613a, in step 612, do not carry advertised information in routing node determination packet, then packet is forwarded to the routing node of down hop, carry out access vector cache, and delete the response message in PIT.
That is, general data bag is considered to only to carry data and returns, instead of carries the packet of advertised information simultaneously.When there being the information of mating described packet in PIT, in wireless network, then broadcasting the packet returned, random delay can be increased to reduce collision probability.
The technique effect of above-described embodiment is: the content that can realize the content source node of limited energy in the process sending described packet is carried away, and then realizes the information increase in this fresh content source to enter in routing table.
Also achieve route discovery mechanisms in aforesaid way, achieve the discovery of cache routing.That is, when a routing node can stablize within a certain period of time certain data is provided time, can using the content source node of this routing node as limited energy.
Alternatively, in the present embodiment, when there being fresh content source node to join in network, if the fresh content source of energetic adds, the mode of the period announcement shown in earlier figures 1 can be adopted, make the routing node in network find new content source node, thus provide content for the routing node of each transmission interest bag.
If the fresh content source node of finite energy, the mode of monitoring can being adopted, when listening to content requests, data can be provided to return, the mode as shown in Fig. 5 C and Fig. 6 A, Fig. 6 B, in the packet returned, carry advertised information simultaneously.Thus arrive the object of content source node discovery.
Alternatively, when a content source node is left, then in the wireless network, if there is the second content source node in routing node broadcasting area, or carry multiple content source node information in request interest bag, then the second content source node can be utilized to provide data.
If the content source node of carrying in request data package cannot obtain data and return, then carry out content by re-transmission and again obtain, alternate content source information can be increased during re-transmission or select other guide source.
Busy extent due to content source node is also for the influencing factor of communication quality with the success or not that communicates.Thus, combine by wireless link condition and node free degree the process realizing packets of information in the embodiment of the present invention.
Embodiment five
The present embodiment provides a kind of routing device, and as shown in Figure 7, the routing device of the present embodiment comprises: receiving element 71, attracting factor generation unit 72, comparing unit 73 and updating block 74;
Wherein, receiving element 71 is for receiving the first advertised information of content source node, and described first advertised information comprises: the content name of content source node, the life span of content name, content source node are to the node free degree of the signal to noise ratio minimum value of routing node, content source node, content source node to the jumping figure of routing node;
Attracting factor generation unit 72 is for obtaining the first attracting factor of described first advertised information according to described signal to noise ratio minimum value, node free degree and jumping figure;
Comparing unit 73 compares for the content of described routing device being provided the information in information table CPT and described first advertised information;
Updating block 74 is for after described comparing unit relatively, and described CPT meets first condition, then upgrade described CPT according to described first advertised information;
Wherein, described first condition comprises following one or more:
The content name of described content source node is not comprised in described CPT;
Described in described CPT, the life span of the content name of content source node is expired;
In described CPT, the second attracting factor of the second advertised information is less than described first advertised information first attracting factor.Second advertised information is the advertised information that the content source node of routing node reception sent before transmission first advertised information.
Alternatively, described first advertised information also comprises: the notice scope of content name; Correspondingly, described routing device also comprises the determining unit 75 shown in figure and discarding unit 76;
Wherein, determining unit 75, for before generating the first attracting factor at described attracting factor generation unit, determines whether the notice scope of content name in described first advertised information reaches maximum notice scope;
When discarding unit 76 is for determining that the notice scope of content name in described first advertised information reaches maximum notice scope in described determining unit, abandon described first advertised information.
Alternatively, described updating block 74 also for, when described determining unit 75 determines that the notice scope of content name in described first advertised information does not reach maximum notice scope, upgrade described first advertised information;
Described in concrete application, routing device also comprises not shown transmitting element 77;
Described transmitting element 77 is sent to the routing device of down hop for the first advertised information upgraded by described updating block.
In another optional application scenarios, described updating block 74 specifically for, when described determining unit 75 determines that the notice scope of content name in described first advertised information does not reach maximum notice scope, upgrade the signal to noise ratio minimum value in described first advertised information and jumping figure.
Alternatively, described first advertised information also comprises: the mark of content source node;
Described updating block 74 is specifically for after described comparing unit relatively, described CPT meets first condition, then in described CPT, store the mark of described content source node, the content name of content source node, the life span of content name and the first attracting factor according to described first advertised information.
Embodiment six
The present embodiment provides a kind of routing device, and as shown in Figure 8, the routing device of the present embodiment comprises: receiving element 81, first judging unit 82, second judging unit 83, the 3rd judging unit 84, acquiring unit 85 and transmitting element 86;
Wherein, receiving element 81 is for receiving a packets of information; First judging unit 82 is interest bag or packet for the packets of information judging described receiving element and receive; Second judging unit 83, for when described first judging unit determines that described packets of information is interest bag, judges that whether the life span of described interest bag is overtime; When 3rd judging unit 84 is for determining that at described second judging unit the life span of described interest bag is not overtime, judge whether described interest bag meets second condition; Acquiring unit 85 is for when described 3rd judging unit determines that described interest bag meets second condition, and the attracting factor according to described interest bag obtains the Delay forwarding described interest bag; Transmitting element 86 forwards described interest bag for the Delay obtained according to described acquiring unit;
Described second condition is: the information of not mating described interest bag in the content caching CS table of described routing device, do not mate the information of described interest bag in the resident table (PIT) of interest bag of described routing device, the content of described routing device provides in information table CPT the information having and mate described interest bag.
In the present embodiment, the acquiring unit 85 of routing device obtains the attracting factor change that the Delay forwarding described interest bag follows described interest bag, the attracting factor of described interest bag is less, then the time delay of the described interest bag of acquiring unit 85 acquisition forwarding of described routing device is larger.
For example, described interest bag can comprise: the life span of the random number of the content name of content source node, the mark of content source node, interest bag, confirmation form, interest bag and options.
The random number of described interest bag be become interested bag equipment produce at random.
Alternatively, described second judging unit 83 is also for determining whether the mark of the content source node in described interest bag is empty; Determine that the mark of the content source node in described interest bag is not for time empty, judges that whether the life span of described interest bag is overtime at described second judging unit 83.
Alternatively, there is the information of mating described interest bag in the CPT of described routing device, be specially:
The content name stored in described CPT is mated with the content name in described interest bag, and content source node in the mark of content source node corresponding to the content name stored in described CPT and described interest bag is marking matched.
Alternatively, if what described second judging unit 83 determined content source node in described interest bag is designated sky, and determining that the life span of described interest bag is not overtime, and described 3rd judging unit 84 determines that described interest bag meets second condition, then described routing device also comprises not shown radio unit 87;
Described radio unit 87 is for interest bag described in delayed broadcast.
Alternatively, when described 3rd judging unit 84 determines that described interest bag does not meet described second condition, described routing device also comprises the 4th not shown judging unit 88:
4th judging unit 88 is for determining according to CS table the data whether having coupling in described routing device;
Described transmitting element 86 is also for determining the data having coupling in described routing device, then to the equipment time delay return data sending interest bag at described 4th judging unit according to CS table;
Or,
Described routing device also comprises not shown the 5th judging unit 89, discarding unit 90 and updating block 91:
According to described PIT, 5th judging unit 89 is for determining whether described routing device has forwarded described interest bag very much;
Discarding unit 90 for determining that described routing device has forwarded described interest bag at described 5th judging unit 89, then abandons described interest bag;
Updating block 91, for after abandoning described interest bag in described discarding unit 90, resets the time-out time of interest bag described in described PIT.
Alternatively, described routing device also comprises not shown adding device 92; Described adding device 92 is shown for described interest bag is added into described PIT.
Alternatively, when aforesaid discarding unit 90 is for determining that at described second judging unit 83 life span of described interest bag is overtime, described interest bag is abandoned.
Alternatively, aforesaid routing device also can comprise the 6th not shown judging unit 93, the 7th judging unit 94, detecting unit 95, delete cells 96;
Wherein, according to the life span of described packet, the 6th judging unit 93, for when described first judging unit 82 determines that the packets of information that described receiving element receives is packet, determines that whether described packet is overtime;
When 7th judging unit 94 is for determining that at the 6th judging unit 93 described packet is not overtime, determine the information whether having the interest bag mating described packet in described PIT;
Detecting unit 95 for determining at described 7th judging unit 94 information having the interest bag mating described packet in described PIT, then detects in described packet whether carry advertised information;
Aforesaid updating block 91 also for when described detecting unit 95 is determined to carry advertised information in described packet, upgrades described CPT according to the advertised information of carrying;
Described transmitting element 86 is also for being forwarded to the routing device of down hop by described packet;
Delete cells 96, after sending described packet at described transmitting element 86, deletes the information of the interest bag mating described packet in described PIT.
Alternatively, aforesaid discarding unit 90 also for when described 7th judging unit 94 determines the information of the interest bag not mating described packet in described PIT, abandons described packet.
Or, when discarding unit 90 is also for determining that at described 6th judging unit 93 life span of described packet is overtime, abandon described packet.
Above-mentioned packet can comprise: the life span of packet, the mark of content source node, the content source node signal to noise ratio minimum value to routing node, the information such as node free degree, the data of content source node, the segment information of described data of content source node, the present embodiment is only and illustrates.
Above-mentioned routing device is the routing device in E-CHANET, by considering the processing mode of the idle degrees comformed information bag of wireless channel conditions and content source node, and then the communication quality of the content source node that Link State is good, the idle degrees of content source node is high can be improved.
Embodiment seven
The present embodiment provides a kind of routing device, this routing device can perform the method for any embodiment of the present invention, as shown in Figure 9, the routing device of the present embodiment comprises: processor 1001, memory 1002, bus 1003 and communication interface 1004, connect by bus 1003 between this processor 1001 and memory 1002, wherein, this memory 1002 is for storing instruction, this processor 1001 performs described instruction, specifically comprises:
Receive the first advertised information of content source node, described first advertised information comprises: the content name of described content source node, the life span of described content name, described content source node are to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node and described content source node to the jumping figure of described routing node;
The first attracting factor of described first advertised information is obtained according to described signal to noise ratio minimum value, node free degree and jumping figure;
Information in the CPT of described routing device and described first advertised information are compared, if described CPT meets first condition, then upgrades described CPT according to described first advertised information;
Wherein, described first condition comprises following one or more:
The content name of described content source node is not comprised in described CPT;
Described in described CPT, the life span of the content name of content source node is expired;
Second attracting factor of the second advertised information in described CPT is less than the first attracting factor of described first advertised information.
Or this processor 1001 performs described instruction, specifically comprises:
Receive a packets of information, determine that described packets of information is interest bag, when determining that described interest bag is not overtime according to the life span of described interest bag, check whether described interest bag meets second condition;
When described interest bag meets second condition, the attracting factor according to described interest bag obtains the Delay forwarding described interest bag;
Delay according to obtaining forwards described interest bag;
Described second condition is: the information of not mating described interest bag in the CS table of routing device, does not mate the information of described interest bag, have the information of mating described interest bag in CPT in PIT.
In the present embodiment, the processor 1001 of described routing device obtains the attracting factor change that the Delay forwarding described interest bag follows described interest bag, the attracting factor of described interest bag is less, then the time delay of the described interest bag of described routing device 1001 acquisition forwarding is larger.
Or this processor 1001 performs described instruction, specifically comprises:
Receive a packets of information, when determining that described packets of information is packet, when determining that described packet is not overtime according to the life span of described packet, check whether described PIT has the information of the interest bag mating described packet;
If there is the information of the interest bag mating described packet in described PIT, then detect in described packet whether carry advertised information;
When carrying described advertised information in described packet, upgrade described CPT according to the advertised information of carrying, and described packet is forwarded to the routing node of down hop, and delete the information of the interest bag mating described packet in described PIT.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (36)

1. a method for sending information, is characterized in that, comprising:
Routing node receives the first advertised information of content source node, and described first advertised information comprises: the content name of described content source node, the life span of described content name, described content source node are to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node and described content source node to the jumping figure of described routing node;
Described routing node obtains the first attracting factor of described first advertised information according to described signal to noise ratio minimum value, described node free degree and described jumping figure;
The content of described routing node provides the information in information table CPT and described first advertised information to compare by described routing node, if described CPT meets first condition, then upgrades described CPT according to described first advertised information;
Wherein, described first condition comprises following one or more:
The content name of described content source node is not comprised in described CPT;
Described in described CPT, the life span of the content name of content source node is expired;
Second attracting factor of the second advertised information in described CPT is less than the first attracting factor of described first advertised information.
2. method according to claim 1, is characterized in that, described first advertised information also comprises: the notice scope of described content name;
Described routing node also comprised obtain the step of the first attracting factor of described first advertised information according to described signal to noise ratio minimum value, described node free degree and described jumping figure before:
Described routing node determines that the notice scope of content name described in described first advertised information reaches maximum notice scope, then abandon described first advertised information.
3. method according to claim 2, it is characterized in that, described routing node determines that the notice scope of content name described in described first advertised information does not reach maximum notice scope, then upgrade described first advertised information, and the first advertised information upgraded is sent to the routing node of down hop.
4. method according to claim 3, is characterized in that, described routing node upgrades described first advertised information, comprising:
Described routing node upgrades content source node described in described first advertised information to the signal to noise ratio minimum value of described routing node and described content source node to the jumping figure of described routing node.
5. method according to claim 1, is characterized in that, described first advertised information also comprises: the mark of content source node;
Described routing node upgrades the CPT of described routing node, comprising:
Store the first attracting factor of the mark of described content source node, the content name of described content source node, the life span of described content name and described first advertised information.
6. a method for sending information, is characterized in that, comprising:
Routing node receives a packets of information, determines that described packets of information is interest bag, when determining that described interest bag is not overtime according to the life span of described interest bag, checks whether described interest bag meets second condition;
Described routing node is when described interest bag meets second condition, and the attracting factor according to described interest bag obtains the Delay forwarding described interest bag;
Described routing node forwards described interest bag according to the Delay obtained;
Described second condition is:
The information of described interest bag is not mated in the content caching CS table of described routing node, do not mate the information of described interest bag in the resident table (PIT) of interest bag of described routing node, the content of described routing node provides in information table CPT the information having and mate described interest bag.
7. method according to claim 6, is characterized in that, the mark of the content source node in described interest bag is not empty.
8. method according to claim 7, is characterized in that, has the information of mating described interest bag, be specially in the CPT of described routing node:
The content name stored in described CPT is mated with the content name in described interest bag, and content source node in the mark of content source node corresponding to the content name stored in described CPT and described interest bag is marking matched.
9. method according to claim 6, is characterized in that, if the content source node in interest bag be designated sky,
Then described routing node is when described interest bag meets second condition, interest bag described in delayed broadcast.
10. method according to claim 6, is characterized in that, also comprises:
When described interest bag does not meet described second condition, described routing node determines there are the data of mating described interest bag in described routing node, then to the node delay return data sending interest bag according to described CS table;
Or,
When described interest bag does not meet described second condition, according to described PIT, described routing node determines that described routing node has forwarded described interest bag, then abandon described interest bag, and reset the time-out time of interest bag described in described PIT.
11. methods according to claim 6, is characterized in that, also comprise:
Described routing node adds described interest bag to described PIT.
12., according to the arbitrary described method of claim 6 to 11, is characterized in that, also comprise:
When described routing node determines described interest bag time-out according to the life span of described interest bag, abandon described interest bag.
13. methods according to claim 10, it is characterized in that, described interest handbag is drawn together: the life span of the mark of the content source node that the content name of request, described content name are corresponding, the random number of described interest bag, confirmation form, described interest bag and options;
Described routing node also comprised obtain the step of the Delay forwarding described interest bag according to the attracting factor of described interest bag before:
Determine whether described interest bag is the interest bag that described routing node repeats to receive according to the random number of described interest bag;
If the random number in another interest bag that the random number in described interest bag and described routing node received before receiving described packets of information is identical, and described routing node is not also to the return data of the node of transmission another interest bag described, and the life span of another interest bag described is not expired, then determine that described interest bag and another interest bag described repeat, abandon described interest bag;
Correspondingly, routing node, to after the node return data sending interest bag, also comprises:
According to described confirmation form and the options content source node feedback information to described data, know according to described routing node feedack the data message that described routing node returns to the node sending interest bag to make described content source node.
14. methods according to claim 6, it is characterized in that, described routing node obtains the attracting factor change that the Delay forwarding described interest bag follows described interest bag, and the attracting factor of described interest bag is less, then the time delay of the described interest bag of described routing node acquisition forwarding is larger.
15. methods according to claim 6, is characterized in that, also comprise:
When described routing node determines that described packets of information is packet, when determining that described packet is not overtime according to the life span of described packet, check whether described PIT has the information of the interest bag mating described packet;
If there is the information of the interest bag mating described packet in described PIT, then detect in described packet whether carry advertised information, described advertised information is the advertised information of the content source node sending described packet;
When carrying described advertised information in described packet, upgrade described CPT according to the advertised information of carrying, and described packet is forwarded to the routing node of down hop, and delete the information of the interest bag mating described packet in described PIT.
16. methods according to claim 15, is characterized in that, also comprise:
When not carrying advertised information in described packet, described packet is forwarded to the routing node of down hop, and deletes the information of the interest bag mating described packet in described PIT.
17. methods according to claim 15, is characterized in that, also comprise:
When not mating the information of the interest bag of described packet in described PIT, abandon described packet.
18., according to claim 15 to 17 arbitrary described methods, is characterized in that, also comprise:
When determining described packet time-out according to the life span of described packet, abandon described packet.
19. methods according to claim 15, it is characterized in that, described packet comprises: the life span of described packet, the mark of content source node, the described content source node data to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node, described content source node, the segment information of described data.
20. 1 kinds of routing devices, is characterized in that, comprising:
Receiving element, for receiving the first advertised information of content source node, described first advertised information comprises: the content name of described content source node, the life span of described content name, described content source node are to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node, described content source node to the jumping figure of described routing node;
Attracting factor generation unit, for obtaining the first attracting factor of described first advertised information according to described signal to noise ratio minimum value, described node free degree and described jumping figure;
Comparing unit, compares for the content of described routing device being provided the information in information table CPT and described first advertised information;
Updating block, for after described comparing unit is relatively, described CPT meets first condition, then upgrade described CPT according to described first advertised information;
Wherein, described first condition comprises following one or more:
The content name of described content source node is not comprised in described CPT;
Described in described CPT, the life span of the content name of content source node is expired;
Second attracting factor of the second advertised information in described CPT is less than described first attracting factor.
21. equipment according to claim 20, is characterized in that, described first advertised information also comprises: the notice scope of described content name; Described routing device also comprises:
Determining unit, before generating the first attracting factor at described attracting factor generation unit, determines whether the notice scope of content name described in described first advertised information reaches maximum notice scope;
Discarding unit, during for determining that the notice scope of content name described in described first advertised information reaches maximum notice scope in described determining unit, abandons described first advertised information.
22. equipment according to claim 21, is characterized in that, described updating block, also for
When described determining unit determines that the notice scope of content name in described first advertised information does not reach maximum notice scope, upgrade described first advertised information;
Described routing device also comprises: transmitting element;
Described transmitting element, the first advertised information also for being upgraded by described updating block is sent to the routing device of down hop.
23. equipment according to claim 22, it is characterized in that, described updating block, specifically for, when described determining unit determines that the notice scope of content name described in described first advertised information does not reach maximum notice scope, upgrade the signal to noise ratio minimum value in described first advertised information and jumping figure.
24. equipment according to claim 20, is characterized in that, described first advertised information also comprises: the mark of content source node;
Described updating block, specifically for after described comparing unit relatively, described CPT meets first condition, then in described CPT, store the first attracting factor of the mark of described content source node, the content name of described content source node, the life span of described content name and described first advertised information according to described first advertised information.
25. 1 kinds of routing devices, is characterized in that, comprising:
Receiving element, for receiving a packets of information;
First judging unit, for judging that the packets of information that described receiving element receives is interest bag or packet;
Second judging unit, for when described first judging unit determines that described packets of information is interest bag, judges that whether the life span of described interest bag is overtime;
3rd judging unit, during for determining that at described second judging unit the life span of described interest bag is not overtime, judges whether described interest bag meets second condition;
Acquiring unit, for when described 3rd judging unit determines that described interest bag meets second condition, the attracting factor according to described interest bag obtains the Delay forwarding described interest bag;
Transmitting element, the Delay for obtaining according to described acquiring unit forwards described interest bag;
Described second condition is:
The information of described interest bag is not mated in the content caching CS table of described routing device, do not mate the information of described interest bag in the resident table (PIT) of interest bag of described routing device, the content of described routing device provides in information table CPT the information having and mate described interest bag.
26. equipment according to claim 25, is characterized in that, described second judging unit is also for determining whether the mark of the content source node in described interest bag is empty;
Determine that the mark of the content source node in described interest bag is not for time empty, judges that whether the life span of described interest bag is overtime at described second judging unit.
27. equipment according to claim 26, is characterized in that, have the information of mating described interest bag, be specially in the CPT of described routing device:
The content name stored in described CPT is mated with the content name in described interest bag, and content source node in the mark of the content source node of the content name correspondence stored in described CPT and described interest bag is marking matched.
28. equipment according to claim 26, it is characterized in that, if what described second judging unit determined content source node in described interest bag is designated sky, and determining that the life span of described interest bag is not overtime, and described 3rd judging unit determines that described interest bag meets second condition, then described routing device also comprises: radio unit;
Described radio unit, for interest bag described in delayed broadcast.
29. equipment according to claim 25, is characterized in that, when described 3rd judging unit determines that described interest bag does not meet described second condition,
Described routing device also comprises:
4th judging unit, for determining whether there are the data of mating described interest bag in described routing device according to CS table;
Described transmitting element, also for determining there are the data of mating described interest bag in described routing device, then to the equipment time delay return data sending interest bag at described 4th judging unit according to CS table;
Or,
Described routing device also comprises:
According to described PIT, 5th judging unit, for determining whether described routing device has forwarded described interest bag very much;
Discarding unit, for determining that described routing device has forwarded described interest bag at described 5th judging unit, then abandons described interest bag;
Updating block, after abandoning described interest bag in described discarding unit, resets the time-out time of interest bag described in described PIT.
30. equipment according to claim 25, is characterized in that, described routing device also comprises: adding device, for described interest bag is added into described PIT.
31. according to the arbitrary described equipment of claim 25 to 30, and it is characterized in that, described routing device also comprises:
Discarding unit, during for determining that at described second judging unit the life span of described interest bag is overtime, abandons described interest bag.
32. equipment according to claim 25, it is characterized in that, described interest handbag is drawn together: the life span of the mark of the content source node that the content name of request, described content name are corresponding, the random number of described interest bag, confirmation form, described interest bag and options.
33. equipment according to claim 25, is characterized in that, described routing device also comprises:
According to the life span of described packet, 6th judging unit, for when described first judging unit determines that the packets of information that described receiving element receives is packet, determines that whether described packet is overtime;
7th judging unit, during for determining that at the 6th judging unit described packet is not overtime, determines the information whether having the interest bag mating described packet in described PIT;
Detecting unit, for determining at described 7th judging unit the information having the interest bag mating described packet in described PIT, then detect in described packet and whether carry advertised information, described advertised information is the advertised information of the content source node sending described packet;
Updating block, during for determining to carry advertised information in described packet at described detecting unit, upgrades described CPT according to the advertised information of carrying;
Described transmitting element, also for described packet being forwarded to the routing device of down hop;
Delete cells, after sending described packet at described transmitting element, deletes the information of the interest bag mating described packet in described PIT.
34. equipment according to claim 33, is characterized in that, also comprise: discarding unit;
Described discarding unit, for when described 7th judging unit determines the information of the interest bag not mating described packet in described PIT, abandons described packet.
35. equipment according to claim 34, is characterized in that, described discarding unit, time also for determining that at described 6th judging unit the life span of described packet is overtime, abandon described packet.
36. according to the arbitrary described equipment of claim 33 to 35, it is characterized in that, described packet comprises: the life span of described packet, the mark of described content source node, the data of described content source node to the node free degree of the signal to noise ratio minimum value of described routing node, described content source node, described content source node, the segment information of described data.
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