CN104038507A - Protocol conversion wireless gateway with content as center and communication method thereof - Google Patents
Protocol conversion wireless gateway with content as center and communication method thereof Download PDFInfo
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Abstract
A protocol conversion wireless gateway with the content as the center is used as an internet communication interface of a backbone network and a wireless sensor network for achieving the functions of protocol conversion and storage forwarding and achieving data communication of two networks based on content modes. The protocol conversion wireless gateway is composed of an ARM plate which is connected with the backbone network in a wired mode, receives data packages sent by the backbone network and is used for conducting analysis and protocol conversion on the data packages, and a sink node which is connected with the wireless sensor network in a wired mode and is used as an aggregation node. The ARM plate is in data communication with the sink node through a usb port. The ARM plate is provided with a usb port monitoring unit, a ccnb unit and a ccnd unit which are in series connection. The sink node is not involved in analysis processing of the data packages and is only in charge of forwarding the data packages. The wireless gateway enables the operation steps for achieving internet communication of the two networks to be simple and easy, data conversion operation is achieved on a network layer, the system overhead of data package transmission and analysis is reduced, and the high efficiency of data communication is kept.
Description
Technical field
The present invention relates to a kind of new network system framework and method of work thereof, exactly, relate to a kind of protocol conversion radio network gateway and communication means thereof centered by content-based, belong to Internet of Things, next generation network or the networking technology area centered by information.
Background technology
Since the Internet is born, TCP/IP is success and effectively communication solution the most at present, is also the communication protocol that supports current Internet architecture.The problem that TCP/IP solves is communication end to end between entity; But, the processing method of this agreement distributing contents be easy to make network to become to block up and load overweight.
In order to solve the Future Internet extensive content transmission facing and the demand of distributing, the future network framework project team of the NSF of National Science Foundation (National Science Foundation) has proposed the network architecture of named data network N DN (Named Data Networking).NDN has proposed to utilize the name of data has been substituted to the name to main frame, realizes by turn to the network into content oriented towards main frame, to meet the demand of resource-intensive application.
CCN (Content-Centric-Networking) is the specific implementation of NDN, and its core is centered by content.Its basic meaning is that the demand of whole network is content, instead of main frame, and therefore CCN is no longer concerned about where content is stored in, but is concerned about content itself.Than IP network, CCN has two outstanding features, and this is relevant with its strategic layer and safe floor.The one, CCN can utilize multiple connected mode the most simultaneously, comprising: Ethernet, 3G, bluetooth, WiFi, WiMAX etc., and can, in the environment constantly changing, dynamically seek optimized implementation.The 2nd, CCN itself has just ensured the safety of the information content that it transmits.In IP network, safety measure is often by the reinforcement of bearer network or terminal implemented, and CCN is to the network equipment and be indifferent to, and it realizes the safety guarantee of Internet Transmission by transmitting the safety of content.
The main actuating force of CCN is the demand to content, and therefore the packet on CCN mainly contains two kinds: request data package (interest packet) and content-data bag (data packet).Need the user of setting content all to send request by certain node to all directions, any node that receives this request, if it has the content that can meet this request, just sends response data by content-data bag to requesting node.The transmission relation of this correspondence is to be based upon on the basis of content identification, and each content has a concrete mark.Exactly because above-mentioned this relation, has the request of same content demand can share identical content and Internet Transmission, has so just saved Internet resources, has improved efficiency.
The identification name of content is formed with structurized multiple field, and by the identification name of this structurized content, CCN can utilize the prefix mechanism that is similar to IP address to locate rapidly needed information.
The groundwork situation of CCN node is also closely similar with IP node.All bear storage, forwarding and the route task of packet.Typical CCN node mainly comprises three parts: content library CS (Content Store), interest table (PIT) undetermined (Pending Interest Table) and forwarding information base FIB (Forwarding Information Base).Wherein, content library CS is similar to the buffer memory of ip router, but the cache replacement policy that it adopts is different from ip router: ip router completes after each session, just institute's canned data is emptied, this strategy is called MRU (Most Recently Used) and replaces.And in CCN, this content information, except being this conversational services, can also be other users' conversational services.Therefore, this content completes after current session, is still present in node, for using (as contents such as videos) next time.This is the very crucial theory of CCN, and it can reduce the content time delay of downloading and the network bandwidth taking.
In order to improve to greatest extent the sharing efficiency of storage information, CCN adopts LRU (Least Recently Used) or LFU (Least Frequently Used) replacement policy to store to greatest extent important information.Interest table (PIT) undetermined is the solicited message for recording process.In CCN, only have request data package to be routed, and content-data bag is to be sent to length by length requesting node according to the instruction of PIT.When asked content is passed back after node, just from PIT, delete this entry.In addition, can also utilize clock to delete those never to find the expired entry of matching content.The treatment mechanism of forwarding information base FIB and ip router is similar, mails to destination by request data package.But they are different from ip router: FIB can be simultaneously to multiple directions Forward-reques.In the time that node receives a packet from an interface, the content name comprising according to it is carried out to maximum matching inquiry, then carry out next step operation according to Query Result.
Wireless sensor network WSN (Wireless Sensor Network) is the wireless network being made up of in the mode of self-organizing and multi-hop a large amount of static or mobile transducers, so that perception collaboratively, collection, processing and transmission network cover the information of object perceived in geographic area, and finally these information are sent to the owner of network.In the world, wireless sensor network is considered to the second largest network after the Internet with its low-power consumption, low cost, feature distributed and self-organizing, has been widely used in now the fields such as environmental monitoring, medical treatment and nursing, military field, target following.
CCNx is an open source protocol model under the CCN network architecture, and it is developed and subsidized by the Parker of Xerox of U.S. research center PARC, supports the communication of content-based mode between main frame.It has only issued host side and two versions of Android end at present, so be also just confined to backbone network about the research of CCN.Due to the function complexity of CCNx agreement, higher to equipment requirement, the performances such as picture wireless sensor node are not high, the weak capable nodes of resource-constrained, cannot use the CCNx agreement with host side identical version, therefore for the node in the edge networks such as wireless sense network, just cannot pass through the main-machine communication in communication mode and the backbone network of content center network.And, be directed to this problem, still there is no a set of feasible solution at present.
Present situation is: on the one hand, the network communication architectures centered by content can effectively solve the network congestion that a large amount of contents distributions cause, and can improve the communication efficiency of network.And wireless sensor network has a wide range of applications in fields such as the people's livelihood, medical treatment, military affairs and national defence with various features such as its self-organizing, mobility and cost are low, so being introduced to wireless sensor network, the network architecture centered by content has very important meaning.On the other hand, the feature of CCN network is: use name instead of the IP address communication of content, focus on the particular content of data, instead of the particular location of data.The route of network is to carry out route according to the name of the hierarchical organization of content, even if network topology changes, also can find content by name prefix.This network architecture characteristic centered by information is highly suitable under the continuous radio sensing network environment changing of topology and applies.
But because the network element disposal ability in backbone network and wireless sensor network and load capacity tool are very different, two communication protocols that network using is different, cause two nodes in network to communicate by letter.This defect also becomes the focus that many scientific and technical personnel pay close attention in the industry.
Summary of the invention
In view of this, the object of this invention is to provide a kind of protocol conversion radio network gateway and communication means thereof centered by content-based, radio network gateway of the present invention is to design for the network architecture centered by content, for realizing the interconnected of backbone network and wireless sensor network, the i.e. communication interface as two networks by this radio network gateway, the function that completes protocol conversion and storage forwarding by it, realizes the data communication of two content-based modes of network.
In order to achieve the above object, the invention provides a kind of radio network gateway of the protocol conversion centered by content-based, for realizing the interconnected of backbone network and wireless sense network; It is characterized in that: described radio network gateway is made up of an advanced RISC machines ARM (Advanced RISC (Reduced Instruction Set Computer) Machines) plate and a transducer sink node as aggregation node, this ARM plate connects sink node by usb port and carries out data communication; Wherein:
ARM plate, is responsible for connecting backbone network with wired mode, receives the packet of backbone network transmission and this packet is resolved and protocol conversion, then being transmitted to sink node; Also connect sink node by usb port, receive the packet that sink node is sent, and to its resolves with protocol conversion after, be forwarded to backbone network; Be provided with usb port monitoring unit, binary coding ccnb (content centric networking binary encoding) unit and backstage finger daemon ccnd (the content centric networking daemon) unit of three serial connections;
Sink node, as the convergence node in radio sensing network, do not participate in the dissection process of packet, the only forwarding of responsible packet: both connected wireless sense network with wireless mode, receive the content-data bag from wireless sense network, and send to ARM plate to process by usb port; Connect ARM plate by usb port again, the packet that ARM plate is sent is forwarded to wireless sense network with wireless mode.
In order to achieve the above object, the present invention also provides a kind of communication means of radio network gateway of the protocol conversion centered by content-based, it is characterized in that: because of CCN (Content-Centric-Networking) network using receiving terminal drive pattern: first by the main frame initiating communication in backbone network, described radio network gateway is born and will be converted to the packet that wireless sense network can receive and resolve from the request data package of backbone network; The content-data bag of again wireless sense network being sent here is forwarded in backbone network after resolving and change through it; Comprise following operating procedure:
Step 1, radio network gateway is carried out initialization operation;
Step 2, radio network gateway receives the request data package from backbone network, to its carry out packet resolve and protocol conversion after, by package forward after treatment in wireless sense network;
Step 3, radio network gateway receives the content-data bag from wireless sense network, to its resolve and protocol conversion after, by package forward after treatment in backbone network.
Innovation advantage of the present invention and technique effect thereof are:
At present, in backbone network and wireless sense network, because the power of network element disposal ability and load capacity is different, it is relatively independent separately each other causing the network communication architectures of these two kinds of networks centered by content-based, does not still have a kind of effective interconnected mechanism can realize backbone network and the data communication of wireless sense network centered by content-based.
Radio network gateway of the present invention is the communication interface as two networks first, and this radio network gateway can be supported the network service centered by content effectively, completes the interconnected of backbone network and Sensor Network; And can effectively the scope of the network architecture centered by content be expanded to as this class edge network of wireless sense network from backbone network.Moreover this radio network gateway simple in structure, realizes easily, make two networks realize the operating procedure of interconnected communication also easier, the conversion operations of two kinds of net network communication data bags is all realized in network layer; Compare with other interfaces of realizing in application layer, reduced the overhead of data packet delivery and parsing, kept the high efficiency of data communication.Therefore, the present invention has good popularizing application prospect.
Brief description of the drawings
Fig. 1 is the protocol conversion radio network gateway structure composition schematic diagram the present invention is based on centered by content.
Fig. 2 is each component units of ARM plate and the sink node communication graph of a relation of radio network gateway of the present invention.
Fig. 3 is the data name design rule schematic diagram that radio network gateway of the present invention relates to.
Fig. 4 is the content-data packet format schematic diagram of wireless sense network.
Fig. 5 is the data communication flow process schematic diagram of radio network gateway of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Referring to Fig. 1 and Fig. 2, introduce the present invention for realizing the radio network gateway structure composition of the protocol conversion centered by backbone network and wireless sense network interconnected content-based: be provided with an advanced RISC machines ARM (Advanced RISC (Reduced Instruction Set Computer) Machines) plate and a transducer sink node (as shown in the figure) as aggregation node, this ARM plate connects sink node by usb port and carries out data communication.Wherein:
ARM plate, is responsible for connecting backbone network with wired mode, receives the packet of backbone network transmission and this packet is resolved and protocol conversion, then being transmitted to sink node; Also connect sink node by usb port, receive the packet that sink node is sent, and to its resolves with protocol conversion after, be forwarded to backbone network.Be provided with usb port monitoring unit, binary coding ccnb (content centric networking binary encoding) unit and backstage finger daemon ccnd (the content centric networking daemon) unit of three serial connections.The function separately of these three unit is respectively:
Usb port monitoring unit: for receiving and resolve the content-data bag of the sink node sending from usb port, and the content-data name after resolving is converted to the request msg name of backbone network, then send to ccnb unit to process request msg name and content-data after conversion.
Ccnb unit: be responsible for receiving request msg name and the content-data of exporting via usb port monitoring unit and it being carried out to data packet format conversion, be encapsulated as after the packet that meets backbone network communications protocol format by it, send to ccnd unit to process.
Ccnd unit: for receiving and resolve the request data package from backbone network, also the backbone network request msg name after resolving is converted to the content-data name that meets Sensor Network communications protocol format, and fill in after setup parameter field according to Sensor Network content-data packet format, again the content-data name after conversion is filled up in data field, finally calculate CRC check code and be filled up to setting field, completing the conversion of backbone network request data package to Sensor Network content-data bag; Then, send it to sink node via usb port, be forwarded to wireless sense network by sink node; Be responsible for receiving from ccnb unit, meeting the content-data bag of backbone network communications protocol format simultaneously, then forward it to backbone network.
Sink node, as the convergence node in radio sensing network, do not participate in the dissection process of packet, the only forwarding of responsible packet: both connected wireless sense network with wireless mode, receive the content-data bag from wireless sense network, and send to ARM plate to process by usb port; Connect ARM plate by usb port again, the packet that ARM plate is sent is forwarded to wireless sense network with wireless mode.
Because in the network centered by content-based, the unique identification of data is exactly name, and, this name format comprises addressing field and data type field two parts, wherein addressing field adopts can realize the elongated Uniform Resource Identifier URI of name level (Universal Resource Identifier) framework, and addressing field comprises the prefix name of this Sensor Network radio network gateway and geographical location information more specifically.But, because of sensor node hardware resource limited, cannot meet the word length requirement of the name field of communication protocol in backbone network, so each data are mapped with two names: the content-data name in request msg name and wireless sense network in backbone network, and carried out the translation function of two data names by radio network gateway of the present invention: this radio network gateway receives after the request data package of backbone network, carry out field cutting and replacement to request msg name; When it receives after the content-data bag of wireless sense network, carry out field to content data name and supplement and replace.
In request msg name format in backbone network, before the addressing field being made up of one or more levels is positioned at, every grade of corresponding geographical position of addressing field, limits its place territorial scope according to the hierarchical structure of descending progressively refinement, until navigate to content-data position.Being positioned at a last field is to indicate the data type field of request msg type, for identifying the data type that will ask.Data type at least comprises: illumination light, humidity humidity and temperature t emperature.
Referring to Fig. 3, introduce name design rule.For example: taking 632 laboratories, the Jiao San of Beijing University of Post & Telecommunication building as embodiment, introduce the composition structure of content name: the radio network gateway of embodiment is responsible for connecting the Sensor Network of the inner all the sensors node composition of backbone network and Beijing University of Post & Telecommunication.The request msg name of backbone network is ccnx: //beijing/haidian/bupt/t3/6/32/light, wherein, ccnx: the prefix name that //beijing/haidian/bupt is this radio network gateway, comprises current geographic position and all geographical location information above for preserving.After gateway prefix name, content is the content-data name for identifying wireless sense network.Because the length of some field is long, cause the length of name part to exceed name field length in Sensor Network communication protocol, thus long field mappings to be replaced to shorter content, to meet the protocol analysis requirement of wireless sense network.Wireless sense network content-data name corresponding to name in above-mentioned example is t3/6/32/l (by removing the residue field of gateway prefix name in the request msg name in backbone network, comprising that the critical field in geographical position and data type field is formed more specifically, and now data type field wherein is replaced by its initial character).The request data package that this radio network gateway is sent backbone network by this prefix name is filtered, and judges that this request data package is to receive or abandon.
The ccnd unit of radio network gateway of the present invention and usb port monitoring unit all have name translation function, for realizing the mutual conversion of name format between the request msg name of backbone network and the content-data name of Sensor Network, so that in data communication process, content to name part is changed, name in the content-data bag receiving is converted to the name format meeting in object network, meets the parsing requirement of object network.Detailed process is:
When the ccnd unit of radio network gateway receives the request data package of backbone network, judge whether to receive or abandon this request data package according to prefix name; If receive, request msg name is carried out to field cutting and replacement: first delete gateway prefix name wherein and extract after critical field, according to the mapping Substitution Rules of setting, last field of characterization data type is shone upon to replacement, replace with corresponding initial character.For example, light (illumination) replaces to l, humidity (humidity) and replaces to h, temperature (temperature) and replace to t etc.Name after replacement is exactly the content-data name of Sensor Network.
Then, the field of filling in setup parameter according to wireless sense network content-data packet format, and the content-data name after conversion is filled up in data field, finally calculate CRC check code, and be filled up to corresponding field, so far realize the conversion of backbone network request data package to Sensor Network content-data bag.
Referring to Fig. 4, the field format of introducing wireless sense network content-data bag of the present invention is as follows:
Represented before this delimiter that packet starts: 7E, word length 1 bit; Then order is successively: three word lengths are 1 bit, represent serial ports type of message respectively, distribute 44,26 and 00 of field and type of message; Three word lengths are 2 bits, the dest addr that represents respectively destination address, source address and data field length, source addr and msg len; The groupID of word length 1 bit, represents group number, is made as 00; The type of word length 1 bit, represents type of data packet, is made as 03; Then order is the data that represents self-defining data, and its word length mostly is 28 bits most; The CRC of word length 2 bits, represents the CRC check code of this message data from the 3rd to data; Finally the delimiter that represents that packet finishes: 7E, word length 1 bit.Wherein destination address dest addr is the next-hop node sequence number that sink node forwards, and source address source addr is the node ID of this sink node.
When radio network gateway usb port monitoring unit receives the content-data bag of Sensor Network, first according to mapping ruler, last field of its name is replaced with after data type, before this content-data name, add gateway prefix name, then after completing the replacement of respective field and supplementing, input parameter according to the ccn_sign_content function form in CCNx framework using request msg name and content-data as this function, completed by this function after the coding of correlated inputs parameter, its output just becomes the request data package that meets backbone network communications protocol format.
Because backbone network request msg packet format of the present invention is the packet that adopts CCNx open source protocol framework to specify, therefore do not repeat them here.
Referring to Fig. 5, introduce the communication means of the radio network gateway that the present invention is based on the protocol conversion centered by content, namely radio network gateway of the present invention is in the operating procedure of the data communication process of network system:
Because CCN (Content-Centric-Networking) network is to adopt receiving terminal drive pattern: first by the main frame initiating communication in backbone network, therefore bearing, radio network gateway of the present invention will be converted to the request data package that wireless sense network can receive and resolve from the request data package of backbone network, the content-data bag of again wireless sense network being sent here is forwarded in backbone network after resolving and change through it.Therefore, the operating procedure of the inventive method is as follows:
Step 1, radio network gateway is carried out initialization operation.This step comprises following content of operation:
(11) start ARM plate, make monitoring, parsing and the Transformation Service of ccnd unit turn-on data bag wherein; Ccnb unit turn-on data is sealed dress and service accordingly thereof, and usb port monitoring unit is carried out after initialization operation, opens the service that sink node data is monitored.
(12) sink node powers on.
Step 2, radio network gateway receives the request data package from backbone network, to its carry out packet resolve and protocol conversion after, by package forward after treatment in wireless sense network.This step content of operation is as follows:
(21) ccnd unit receives after the request data package that backbone network sends, and resolves this packet; Convert the request msg name after resolving to wireless sense network content-data name again: first extract critical field according to gateway prefix name, then data type field is wherein carried out to Mapping and Converting.
(22) ccnd unit is filled in after setup parameter field according to the content-data packet format of Sensor Network communication protocol, again the content-data name after conversion is filled up in data field, finally calculate CRC check code and be filled up to setting field, just complete the content-data name packing in wireless sense network is encapsulated as to Sensor Network request data package,, then send sink node to then.
(23) sink node by the package forward receiving in Sensor Network.
Step 3, radio network gateway receives the content-data bag from wireless sense network, to its resolve and protocol conversion after, by package forward after treatment in backbone network.This step comprises following content of operation:
(31) usb port monitoring unit receives after the content-data bag that wireless sense network sends, resolve this packet, and convert the content-data name after resolving to backbone network request msg name: recover original data type field according to field mappings rule, add again gateway prefix name, form after the request msg name of backbone network; This backbone network request msg name and content-data are sent to ccnb unit.
(32) ccnb unit encapsulates the request msg name receiving and content-data according to backbone network communications protocol format, be packaged as after the content-data bag that meets backbone network communications protocol format, then by this packaged Packet Generation to ccnd unit.
(33) package forward that ccnb unit is sent in ccnd unit is in backbone network.
The present invention has carried out Multi simulation running and has implemented test, and the result of test is successfully, has realized goal of the invention.
Claims (10)
1. a radio network gateway for the protocol conversion centered by content-based, for realizing the interconnected of backbone network and wireless sense network; It is characterized in that: described radio network gateway is made up of an advanced RISC machines ARM (Advanced RISC (Reduced Instruction Set Computer) Machines) plate and a transducer sink node as aggregation node, this ARM plate connects sink node by usb port and carries out data communication; Wherein:
ARM plate, is responsible for connecting backbone network with wired mode, receives the packet of backbone network transmission and this packet is resolved and protocol conversion, then being transmitted to sink node; Also connect sink node by usb port, receive the packet that sink node is sent, and to its resolves with protocol conversion after, be forwarded to backbone network; Be provided with usb port monitoring unit, binary coding ccnb (content centric networking binary encoding) unit and backstage finger daemon ccnd (the content centric networking daemon) unit of three serial connections;
Sink node, as the convergence node in radio sensing network, do not participate in the dissection process of packet, the only forwarding of responsible packet: both connected wireless sense network with wireless mode, receive the content-data bag from wireless sense network, and send to ARM plate to process by usb port; Connect ARM plate by usb port again, the packet that ARM plate is sent is forwarded to wireless sense network with wireless mode.
2. protocol conversion gateway according to claim 1, is characterized in that: the function separately of three unit on described ARM plate respectively:
Usb port monitoring unit, for receiving and resolve the content-data bag of the sink node sending from usb port, and the content-data name after resolving is converted to the request msg name of backbone network, then send to ccnb unit to process request msg name and content-data after conversion;
Ccnb unit, is responsible for receiving request msg name and the content-data of exporting via usb port monitoring unit and it being carried out to data packet format conversion, is encapsulated as after the packet that meets backbone network communications protocol format by it, sends to ccnd unit to process;
Ccnd unit, for receiving and resolve the request data package from backbone network, also the backbone network request msg name after resolving is converted to the content-data name that meets Sensor Network communications protocol format, and fill in after setup parameter field according to Sensor Network content-data packet format, again the content-data name after conversion is filled up in data field, finally calculate CRC check code and be filled up to setting field, completing the conversion of backbone network request data package to Sensor Network content-data bag; Then, send it to sink node via usb port, be forwarded to wireless sense network by sink node; Be responsible for receiving from ccnb unit, meeting the content-data bag of backbone network communications protocol format simultaneously, then forward it to backbone network.
3. protocol conversion gateway according to claim 1, it is characterized in that: in the network centered by content-based, the unique identification of data is names, and this name format comprises addressing field and data type field two parts, wherein addressing field adopts can realize the elongated Uniform Resource Identifier URI of name level (Universal Resource Identifier) framework, but because of sensor node hardware resource limited, cannot meet the word length requirement of the name field of communication protocol in backbone network, therefore each data are mapped with two names: the content-data name in request msg name and wireless sense network in backbone network, and carry out the translation function of two data names by gateway, described addressing field comprises the prefix name of this Sensor Network radio network gateway and geographical location information more specifically.
4. protocol conversion gateway according to claim 3, it is characterized in that: in the request msg name format in described backbone network, before the addressing field being made up of one or more levels is positioned at, every grade of corresponding geographical position of addressing field, limit its place territorial scope according to descending progressively refinement, until navigate to content-data position; Being positioned at a last field is to indicate the data type field of request msg type, and data type at least comprises: illumination light, humidity humidity and temperature t emperature;
Content-data name in described Sensor Network is by removing the residue field of gateway prefix name in the request msg name in backbone network, comprising that the critical field in geographical position and data type field is formed more specifically, and now data type field wherein is replaced by its initial character.
5. protocol conversion gateway according to claim 3, is characterized in that: the field format of described wireless sense network content-data bag is as follows: represented before this delimiter that packet starts: 7E, word length 1 bit; Then order is successively: three word lengths are 1 bit, represent serial ports type of message respectively, distribute 44,26 and 00 of field and type of message; Three word lengths are 2 bits, the dest addr that represents respectively destination address, source address and data field length, source addr and msg len; The groupID of word length 1 bit, represents group number, is made as 00; The type of word length 1 bit, represents type of data packet, is made as 03; Then order is the data that represents self-defining data, and its word length mostly is 28 bits most; The CRC of word length 2 bits, represents the CRC check code of this message data from the 3rd to data; Finally the delimiter that represents that packet finishes: 7E, word length 1 bit; Described destination address dest addr is the next-hop node sequence number that sink node forwards, and source address source addr is the node ID of this sink node;
Described backbone network request msg packet format is the packet that adopts CCNx open source protocol framework to specify.
6. protocol conversion gateway according to claim 3, it is characterized in that: the translation function of described two data names is that the name to content-data is changed in data communication process, name in the content-data bag receiving is converted to the name format meeting in object network, to meet the parsing requirement of object network; Detailed process is:
While receiving the request data package of backbone network, radio network gateway judges whether to receive or abandon this request data package according to prefix name; If receive, request msg name is carried out to field cutting and replacement: first delete gateway prefix name wherein and extract after critical field, according to the mapping Substitution Rules of setting, the field of characterization data type is replaced with after corresponding initial character, just form the content-data name of wireless sense network;
While receiving the content-data bag of Sensor Network, radio network gateway first replaces with last field of its name after corresponding data type according to mapping ruler, before this content-data name, add gateway prefix name, then after completing the replacement of respective field and supplementing, input parameter according to the ccn_sign_content function form in CCNx framework using request msg name and content-data as this function, completed by this function after the coding of correlated inputs parameter, its output just becomes the request data package that meets backbone network communications protocol format.
7. the communication means of the radio network gateway of the protocol conversion centered by content-based, it is characterized in that: because of CCN (Content-Centric-Networking) network using receiving terminal drive pattern: first by the main frame initiating communication in backbone network, described radio network gateway is born and will be converted to the packet that wireless sense network can receive and resolve from the request data package of backbone network; The content-data bag of again wireless sense network being sent here is forwarded in backbone network after resolving and change through it; Comprise following operating procedure:
Step 1, radio network gateway is carried out initialization operation;
Step 2, radio network gateway receives the request data package from backbone network, to its carry out packet resolve and protocol conversion after, by package forward after treatment in wireless sense network;
Step 3, radio network gateway receives the content-data bag from wireless sense network, to its resolve and protocol conversion after, by package forward after treatment in backbone network.
8. method according to claim 7, is characterized in that: described step 1 comprises following content of operation:
(11) start ARM plate, make monitoring, parsing and the Transformation Service of ccnd unit turn-on data bag wherein; Ccnb unit turn-on data is sealed dress and service accordingly thereof, and usb port monitoring unit is carried out after initialization operation, opens the service that sink node data is monitored;
(12) sink node powers on.
9. method according to claim 7, is characterized in that: described step 2 comprises following content of operation:
(21) ccnd unit receives after the request data package that backbone network sends, and resolves this packet; Convert the request msg name after resolving to wireless sense network content-data name again: first extract critical field according to gateway prefix name, then data type field is wherein carried out to Mapping and Converting;
(22) ccnd unit is filled in after setup parameter field according to the content-data packet format of Sensor Network communication protocol, again the content-data name after conversion is filled up in data field, finally calculate CRC check code and be filled up to setting field, just complete the content-data name packing in wireless sense network is encapsulated as to Sensor Network request data package,, then send sink node to then;
(23) sink node by the package forward receiving in Sensor Network.
10. method according to claim 7, is characterized in that: described step 3 comprises following content of operation:
(31) usb port monitoring unit receives after the content-data bag that wireless sense network sends, resolve this packet, and convert the content-data name after resolving to backbone network request msg name: recover original data type field according to field mappings rule, add again gateway prefix name, form after the request msg name of backbone network; This backbone network request msg name and content-data are sent to ccnb unit;
(32) ccnb unit encapsulates the request msg name receiving and content-data according to backbone network communications protocol format, be packaged as after the content-data bag that meets backbone network communications protocol format, then by this packaged Packet Generation to ccnd unit;
(33) package forward that ccnb unit is sent in ccnd unit is in backbone network.
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