WO2006068112A1 - センサ機器、検索機器、および中継機器 - Google Patents
センサ機器、検索機器、および中継機器 Download PDFInfo
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- WO2006068112A1 WO2006068112A1 PCT/JP2005/023318 JP2005023318W WO2006068112A1 WO 2006068112 A1 WO2006068112 A1 WO 2006068112A1 JP 2005023318 W JP2005023318 W JP 2005023318W WO 2006068112 A1 WO2006068112 A1 WO 2006068112A1
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- 230000004044 response Effects 0.000 claims abstract description 126
- 238000004891 communication Methods 0.000 claims abstract description 115
- 238000005259 measurement Methods 0.000 claims description 142
- 238000000034 method Methods 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000012546 transfer Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 description 39
- 238000010586 diagram Methods 0.000 description 25
- 238000007726 management method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 230000006870 function Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/246—Connectivity information discovery
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/16—Multipoint routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/20—Communication route or path selection, e.g. power-based or shortest path routing based on geographic position or location
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Definitions
- the present invention relates to a sensor device that measures a surrounding situation, a search device that searches for a sensor device via a network, and a relay device that relays communication between the sensor device and the search device.
- IP Internet Protocol
- a sensor node which is a sensor device in which a single or a plurality of sensors and a network communication function are integrated is used.
- the sensor node search includes a static property search and a dynamic property search. For example,
- the properties of the sensor node may be the installed position, temperature, humidity, etc.
- the "position” property has the sensor node fixedly installed. Therefore, it is a static property
- the “temperature” and “humidity” properties are dynamic properties that vary depending on the time of measurement.
- the search node for searching for sensor nodes transmits inquiry data of position information to all the sensor nodes, Response data is returned from the sensor node existing in the target area.
- a method of listing the sensor node addresses in the response data on the search node side can be considered.
- communication bandwidth is compressed and wasted due to wide-area broadcasting, which is not realistic in terms of scalability.
- FIG. 1 is a diagram showing an outline of a conventional sensor network that uses a database for searching for sensor nodes.
- the database 204 manages a correspondence table between the position information of the sensor nodes 202 and 203 and the addresses of the sensor nodes.
- the search node uses the database 204 to perform a database search using the position information as a search condition. Thereby, the search node can list the addresses of sensor nodes corresponding to the search condition without making an inquiry to the sensor node 202 and the sensor node 203.
- a plurality of sensor nodes are provided in a plurality of vending machines, for example.
- the sensor measurement target at each sensor node is the remaining number for each type of juice in the vending machine, and each type of juice is associated with the channel address in multicast communication on a one-to-one basis.
- the correspondence information is also placed on a server on the network along with the location information of each vending machine.
- the search node accepts the juice type as a search condition, and acquires a channel address corresponding to the search condition from the server. It also sends a reply request to the acquired channel address.
- a reply request sent to a channel address is subject to processing such as response only by sensor nodes participating in the channel corresponding to the channel address.
- the search node can specify the vending machine corresponding to the search from the content of the response received from each vending machine power.
- the search node does not need to send a reply request for each sensor node.
- the sensor node does not need to perform processing such as analyzing the transmission request by participating in the channel used for transmission of the reply request! If the sensor node is in the network under the router, the reply request is filtered by the router, and only the reply request for the channel in which the subordinate sensor node is participating can pass through the router. As a result, unnecessary reply requests do not flow to the network under the router.
- Patent Document 1 Japanese Patent Laid-Open No. 2004-173108
- Patent Document 2 Japanese Patent Laid-Open No. 2004-200821
- a sensor node is searched for by a dynamic property in the sensor network system. For example, suppose you search for a sensor node in a certain temperature range.
- the temperature of each sensor node needs to be registered in the database in advance.
- the information freshness must be maintained by updating the correspondence table stored in the database at regular intervals.
- the search node may send the inquiry data for inquiring the measured temperature for each channel, and the network and the search rather than sending the inquiry data for each sensor node. There is little load on the node.
- all sensor nodes need to perform processing for generating response data, such as at least analyzing the contents of transmission data transmitted from the search node. For example, if a search node searches for a sensor node with a measured temperature of 20 ° C, it is necessary to respond at all. A sensor node with a measured temperature far from 20 ° C also performs processing such as analysis of the query data. It is necessary to do. In other words, the sensor node can increase unnecessary processing load.
- the present invention is a sensor device, a search device, and a relay device that relays communication between the sensor device and the search device that constitute the sensor network in consideration of the above-described conventional problems. It is an object to provide a sensor device, a search device, and a relay device that can flexibly search for a sensor device and suppress generation of unnecessary loads on the network and each device due to the search.
- a sensor device of the present invention is a sensor device that communicates with another device via a network having a plurality of channels for communication, and includes the plurality of channels. Each is associated with a channel address for communication in each channel, and the sensor device has an address storage means for storing a channel address used for communication with the other device, and surrounding conditions.
- Measurement to obtain measurement values Means a table storage means for storing an address table in which measurement values that can be obtained by the measurement means are associated with channel addresses, and a channel corresponding to the measurement value obtained from the measurement means.
- a specifying means for specifying an address by referring to the address table; an update means for updating a channel address stored in the address storage means to the channel address specified by the specifying means; Receiving means for receiving inquiry data transmitted from the other device; and determining whether the inquiry data received by the receiving means is addressed to a channel address stored in the address storage means.
- the determination means and the determination means determine that the inquiry data is addressed to the channel address.
- a response generation unit that generates response data that is a response to the inquiry data, and a transmission unit that transmits the response data generated by the response generation unit to the other device.
- the sensor device of the present invention can update a channel with which it communicates in response to a dynamically changing measurement value.
- inquiry data may be transmitted to the channel corresponding to the search condition.
- the sensor device can determine whether or not the force is response data to be handled by the determination means. As a result, it is possible to respond only to inquiry data that should be answered without processing unnecessary response data, and the device that sent the inquiry data can receive this response data.
- the sensor device of the present invention does not require a database system in the prior art, and can be flexibly searched by dynamic properties, and does not generate unnecessary load! / ⁇ Sensor equipment.
- the update unit updates the channel address stored in the address storage unit
- the request to leave the channel corresponding to the channel address before the update A request to participate in the channel corresponding to the updated channel address is transmitted to the communication device connected to the network via the transmission unit, and the reception unit is present outside the network.
- the inquiry data transmitted from another device is transmitted via the communication device and the network. Even if you receive it.
- the updating means includes the measurement value obtained from the measurement means by the specifying means in the measurement value corresponding to the channel address stored in the address storage means.
- the channel address stored in the address storage means is updated to the channel address specified by the specifying means, and the measurement value obtained from the measuring means by the specifying means is the address storage means. If the measured value corresponding to the channel address stored in V is included in the measured value, the update means may not update the channel address stored in the address storage means.
- the address storage When the channel address stored in the stage is updated to the channel address specified by the specifying means, and the channel address specified by the specifying means is the same as the channel address stored in the address storing means, Do not update the channel address stored in the address storage means.
- the update process is performed only when the channel used for communication needs to be updated. In other words, the overall processing performed by the sensor device can be made more efficient.
- the channel address recorded in the address table may be an Internet Protocol (IP) multicast address, and the channel address recorded in the address table is It may be the peer address of a bind point in a peer 'one' peer (P2 P) network.
- IP Internet Protocol
- P2 P peer 'one' peer
- the network to which the sensor device of the present invention is connected may be any network that can communicate over a plurality of channels. For this reason, sensor devices are connected to various existing networks. It can be used by connecting to.
- the updating means additionally writes the channel address specified by the specifying means to the address storage means!
- the channel address stored in the address storage unit before the additional recording is deleted, whereby the channel address stored in the address storage unit is changed to the channel address stored in the address storage unit. Update it to the channel address specified by the specifying means.
- the response generation unit obtains a measurement value corresponding to a destination address of the inquiry data received by the reception unit, and acquires the measurement value of the address table. Response data including may be generated.
- the response generation unit may acquire a measurement value from the measurement unit and generate response data including the measurement value.
- the measurement target of the measurement unit is a wireless tag having its own identification information, and the measurement unit wirelessly transmits the identification information included in the wireless tag.
- the identification information may be obtained as a measurement value by reading through communication.
- the sensor device of the present invention can be employed in a management system that manages a distribution product with a wireless tag attached thereto.
- the relay device of the present invention is connected to the first network, and communicates between a sensor device that measures a surrounding situation and obtains a measured value, and a search device that is connected to the second network.
- Each of the first network and the second network has a plurality of channels for communication, and each of the plurality of channels is a communication in each channel.
- the relay device includes a relay source table storage unit that stores a relay source address table in which a measurement value obtainable by the sensor device and a channel address in the second network are associated with each other, and the sensor Relay destination table storage means for storing a relay destination address table in which a measurement value that can be obtained by the device and a channel address in the first network are associated with each other, and a channel recorded in the relay source address table
- the relay address storage means for storing the channel address necessary for the relay, and the channel address stored in the relay address storage means are recorded in the relay source address table based on a predetermined instruction.
- the inquiry data transmitted from the relay address storage means is stored in the relay address storage means, and the determination means determines whether or not the inquiry data is addressed to the channel address. If it is determined that the address is addressed to the channel address, the measured value specifying means for specifying the measured value corresponding to the channel address from the inquiry data, and the measured value specifying means specified by the measured value specifying means.
- a relay destination specifying unit that specifies a channel address in the first network corresponding to a measured value by referring to the relay destination address table, and a channel address specified by the relay destination specifying unit, Transfer means for transmitting inquiry data.
- the search device can transparently execute the search by the dynamic property. it can.
- the relay device of the present invention can update the channel address used to receive the inquiry data in the same way as the sensor device, so that the inquiry data is transmitted when the search condition is changed. Can respond to channel changes and enables flexible search.
- the measured value specifying means obtains the destination of the inquiry data, refers to the relay source address table, and thereby the destination channel of the inquiry data.
- the measurement value corresponding to the address may be specified.
- the search device of the present invention is a search device that searches for a sensor device that measures a surrounding situation and obtains a measurement value via a network having a plurality of channels for communication, and each of the plurality of channels. Is associated with a channel address for communication in each channel, and the search device stores an address table in which a measurement value obtainable by the sensor device and a channel address are associated with each other. Means, a receiving means for receiving a search condition including information indicating measurement values obtainable by the sensor device, and a channel address corresponding to the search condition received by the receiving means with reference to the address table.
- the sensor device Based on the identification means and the search conditions described above, the sensor device corresponding to the search conditions Query generating means for generating query data to be transmitted, and transmitting the query data to the channel address specified by the specifying means, and receiving response data as a response of the sensor device power to the query data Communication means.
- this makes it possible to search for a sensor device based on the measured value of the sensor device that is a dynamic property.
- the database system of the prior art is not necessary for this search, and the sensor device force response data corresponding to the search can be received by transmitting the inquiry data to the channel address corresponding to the search condition.
- the present invention can also be realized as a search system including the sensor device of the present invention and a search device. Further, by providing the relay device of the present invention, even when the sensor device and the search device are connected to a sensor network having different network address allocation policies, the search device can transparently search for dynamic properties. It is possible to execute it.
- the present invention can be realized as a method having the characteristic components of the sensor device, the search device, and the relay device of the present invention as a step, or as a program including these steps. It can be realized as a storage medium such as a CD-ROM where the program is stored, or as an integrated circuit. The program can also be distributed via a transmission medium such as a communication network.
- the present invention can flexibly search for sensor devices based on dynamic properties, and It is possible to provide sensor devices, search devices, and relay devices to suppress the generation of unnecessary loads on the network and each device due to search.
- a sensor device can be searched using a property that dynamically varies, such as the ambient temperature of the sensor device, as a search condition. You can list without using a database.
- the search device changes the search condition in various ways within the range of the measurement value that can be obtained by the sensor device. It is also possible to obtain appropriate search results according to each search condition.
- the search device Even when the search device and the sensor device are connected to a sensor network having a different network address allocation policy by the relay device of the present invention, the search device transparently searches for dynamic properties. Can be executed.
- FIG. 1 is a diagram showing an outline of a conventional sensor network that uses a database for searching sensor nodes.
- FIG. 2 is a diagram showing a configuration outline of a sensor network according to Embodiment 1 of the present invention.
- FIG. 3 is a functional block diagram showing a functional configuration of a sensor node and a search node according to the first embodiment of the present invention.
- FIG. 4 is a diagram showing an example of a data configuration of an address table in the first embodiment of the present invention.
- FIG. 5 is a flowchart showing a flow of an operation related to the update of the participating channel address in the sensor node of the first embodiment of the present invention.
- FIG. 6 is a flowchart showing a flow of operations related to generation and transmission of inquiry data in the search node according to the first embodiment of the present invention.
- FIG. 7 is a diagram showing an example of the data format of inquiry data and response data in the payload portion of the UDP packet.
- FIG. 8 (A) to FIG. 8 (D) are views showing a plurality of examples of data contents of inquiry data and response data in the first embodiment.
- FIG. 9 is a flowchart showing a flow of an operation related to processing of inquiry data in the sensor node according to the first embodiment of the present invention.
- FIG. 10 is a diagram showing an example of the data structure of an address table when a P2P network is used as a network between a sensor node and a search node.
- FIG. 11 is a functional block diagram showing functional configurations of an ID scanner node and a search node according to the second embodiment of the present invention.
- FIG. 12 is a diagram showing an example of a data configuration of individual identification numbers in the second embodiment.
- FIG. 13 is a diagram showing an example of a data configuration of an address table in the second embodiment.
- FIG. 14 is a diagram showing an outline of the configuration of the sensor network in the third embodiment.
- FIGS. 15 (A) and 15 (B) show the relay device of the third embodiment of the present invention. It is a functional block diagram showing a functional configuration.
- FIG. 16 (A) and FIG. 16 (B) are flowcharts showing the flow of operations related to relay of inquiry data in the relay node according to the third embodiment of the present invention.
- FIG. 2 is a diagram showing an outline of the configuration of the sensor network in the first embodiment of the present invention.
- the sensor network in the first embodiment includes a search node 120 and a plurality of sensor nodes 100.
- the sensor node 100 is an example of the sensor device of the present invention
- the search node 120 is an example of the search device of the present invention.
- the search node 120 and the plurality of sensor nodes 100 are connected to the network 130 and can communicate with each other.
- the network 130 is a network having a plurality of channels for communication.
- IPv6 Internet Protocol Version 6
- FIG. 3 is a functional block diagram showing a functional configuration of the sensor node and the search node according to the first embodiment of the present invention.
- the sensor node 100 and the search node 120 have other components for communication and the like, but illustration and description thereof are omitted, and only the characteristic components of the present invention are illustrated and described. .
- the sensor node is connected to the IPv6 network 111 via the router 110, and the search node 120 is connected to the IPv6 network 111 via the router 112!
- the router 110 and the router 112 are routers compatible with multicast communication.
- the router 110 is an example of a communication device that accepts a request to join and leave a channel from the sensor device of the present invention.
- the sensor network of the present embodiment is a sensor network realized on an IP network.
- the sensor node 100 includes a table storage unit 101, an address specifying unit 102, a temperature sensor 103, a humidity sensor 104, an address storage unit 107, an address update unit 105, a response generation unit 106, a determination unit 108, and a communication unit 109.
- the table storage unit 101 is a storage device that stores an address table in which a correspondence between a measurement value that can be obtained by the temperature sensor 103 and a channel address in multicast communication is recorded.
- the address table will be described later with reference to FIG.
- the address specifying unit 102 is a processing unit that acquires a measurement value from the temperature sensor 103 and refers to an address table to specify a channel address corresponding to the measurement value.
- the temperature sensor 103 and the humidity sensor 104 are sensors that measure ambient conditions and obtain measurement values. Specifically, the temperature sensor 103 measures the temperature around itself, and the humidity sensor 104 measures the humidity around itself. Each of the temperature sensor 103 and the humidity sensor 104 is an example of measuring means in the sensor device of the present invention.
- the address storage unit 107 is a storage device that stores a channel address used by the sensor node 100 for communication with the search node 120. Specifically, a channel address that is a destination of data to be received by the sensor node 100 is stored.
- the address update unit 105 is a processing unit that updates the channel address stored in the address storage unit 107 to the channel address specified by the address specifying unit 102.
- the address update unit 105 participates in the channel of the channel address after the update at the time of this update, and requests the router to leave the channel address of the channel address before the update that has been participating up to that point. Send to 110.
- the “participating channel address” refers to the channel address of the channel that is participating and is stored in the address storage unit 107!
- the communication unit 109 is a processing unit that exchanges data with the search node 120.
- the communication unit 109 realizes a data transmission / reception function issued by the reception unit and transmission unit in the search device of the present invention.
- the determination unit 108 is a processing unit that determines whether the data received by the communication unit 109 is a destination power participation channel address. That is, it is a processing unit that determines whether or not the data received by the communication unit 109 has been transmitted using the channel in which the communication unit 109 is participating.
- the response generation unit 106 is a processing unit that analyzes the data determined by the determination unit 108 as the destination being the participation channel address, and generates response data.
- the search node 120 includes a table storage unit 121, an address specifying unit 122, a query generation unit 123, a reception unit 124, a communication unit 125, and a response processing unit 126.
- the table storage unit 121 is a storage device that stores an address table in which an association between a measured value that can be obtained by the temperature sensor 103 of the sensor node 100 and a channel address in multicast communication is recorded. That is, the address table stored in the table storage unit 121 is the same as the address table stored in the table storage unit 101 of the sensor node 100.
- the accepting unit 124 is a processing unit that accepts a search condition input by a user or higher system power.
- This search condition includes information indicating measurement values that can be obtained by the temperature sensor 103.
- the address specifying unit 122 is a processing unit that specifies the channel address corresponding to the search condition received by the receiving unit 124 by referring to the address table stored in the table storage unit 121. .
- the query generation unit 123 is a processing unit that generates query data for matching the sensor node 100 with the sensor measurement value and the like based on the search condition received by the reception unit 124.
- the communication unit 125 is a processing unit that exchanges data with the sensor node 100.
- the response processing unit 126 is a processing unit that analyzes and processes the response data transmitted from the sensor node 100 according to the inquiry data, and outputs the processing result to the user or the host system.
- FIG. 4 is a diagram showing an example of the data configuration of the address table in the first embodiment of the present invention.
- the address table shown in FIG. 4 is a table in which measurement values that can be obtained by the temperature sensor 103 are associated with channel addresses.
- the range of measurement values that can be obtained by temperature sensor 103 is divided into a plurality of sections, information that can identify each section, and the channel corresponding to the section.
- An address is associated! /
- the address table shown in FIG. 4 is stored in both the table storage unit 101 of the sensor node 100 and the table storage unit 121 of the search node 120.
- the address table is created, for example, by acquiring channel addresses that can be used according to the network policy for a necessary section and assigning them in advance.
- the number of necessary channel addresses is determined by the system policy of how many sections the range of measurement values obtainable by the temperature sensor 103 should be divided into.
- a system policy may be considered such as dividing into sections that match the required search accuracy, or dividing into sections that average the number of sensor nodes included in each section.
- the address table shown in FIG. 4 is configured based on a system policy that enables searching the temperature axis from 50 ° C to + 50 ° C in 1 ° C increments.
- the temperature axes around 20 ° C are B0 (+17.5, +18.5), B1 (+18.5, +19.5), B2 (+19.5, +20.5), B3 (+20.5, +21.5), B4 (+ 21.5, +22.5)
- the damage is done in increments of C.
- each section has "ffl5:: 5: 100", “ffl5:: 5: 102”, “ff 15:: 5: 10 4", “ff 15:: 5: 106”, "ffl5 An IP multicast address is associated with the channel address, as in:: 5: 108 ".
- the address specifying unit 102 when the address specifying unit 102 receives a measured value of “20 ° C.” from the temperature sensor 103, for example, by referring to the address table shown in FIG. : A channel address of 104 "can be specified.
- the address specifying unit 122 when the address specifying unit 122 receives a search condition including information indicating, for example, the measurement value “21 ° C.” from the reception unit 124, refer to the address table shown in FIG. By doing so, the channel address "ff 15:: 5: 106" can be specified.
- the sensor node 100 and the search node 120 have the same address table.
- the state of having the same address table in common is realized, for example, by storing the same address table in a nonvolatile manner in the table storage unit of each node in advance.
- FIG. 5 is a flowchart showing an operation flow related to the update of the participating channel address in the sensor node 100 according to the first embodiment of the present invention.
- the temperature sensor 103 measures the temperature at a predetermined interval, for example, every minute (Sl).
- the address specifying unit 102 refers to the address table stored in the table storage unit 101 based on the measured value measured by the temperature sensor 103 (S2), and the channel corresponding to the measured value is displayed. An address is specified (S3).
- the address update unit 105 updates the participation channel address with the specified channel address (S4).
- address update unit 105 rewrites the channel address stored in address storage unit 107.
- the specified channel address is written.
- the join and leave processing is a process for notifying the network side from the node side of the start and stop of transfer of communication data addressed to the specified channel to its own node. It is usually realized by control.
- the address update unit 105 sends a request to join the channel corresponding to the updated channel address and a request to leave the channel corresponding to the channel address before the update to the router 110. By sending, participation and withdrawal processing is realized.
- the router 110 transmits data to the channel address specified by the transmitted participation request. Filtering is performed to transfer only the data to the devices under the router 110.
- the participating channel address is updated based on the measured value by the temperature sensor 103 in this way.
- FIG. 6 is a flowchart showing an operation flow related to generation and transmission of inquiry data in search node 120 according to Embodiment 1 of the present invention.
- the accepting unit 124 accepts the search condition in which the user and the upper system power are also input (S11). As described above, this search condition includes information indicating a measurement value that can be obtained by the temperature sensor 103.
- the address specifying unit 122 receives the search condition received by the reception unit 124, refers to the address table stored in the table storage unit 121 (S12), and selects the channel address corresponding to the search condition. Identify (S 13).
- the query generation unit 123 generates query data for the sensor node 100 corresponding to the search condition based on the search condition received by the reception unit 124 (S14).
- the communication unit 125 receives the channel address specified by the address specifying unit 122, and transmits the inquiry data generated by the inquiry generation unit 123 to the channel address (S15).
- the inquiry data is stored in the payload of User Datagram Protocol (UDP) packet and transmitted.
- UDP User Datagram Protocol
- FIG. 7 is a diagram showing an example of the data format of inquiry data and response data in the payload portion of the UDP packet.
- the inquiry data and the response data are stored in the payload of the UDP packet in the same data format and transmitted / received.
- this data format has four fields: a data type field, a query data ID field, a query property field, and a detailed data field.
- the data type field indicates whether the own data is inquiry data or response data. If “OxOOOl”, it is query data, and if “0x0011”, it is response data.
- Query data The ID field is a simple increment counter value to guarantee the uniqueness of the query data.
- the query data and the response data for the query data are linked by the query data ID.
- the query property field is a field indicating what property is being queried. At least one value of “0x0000” to “0x0004” is stored.
- Each of "0x0000" to "0x0004" corresponds to the properties of no specification, humidity, temperature, individual identification number, and position information.
- the individual identification number is identification information in accordance with a number system in which the uniqueness of the identification number is guaranteed on a specific domain.
- a numbering system is the Electronic Product Code (EPC) system used for Radio Frequency Identificatio (RFID).
- EPC Electronic Product Code
- RFID Radio Frequency Identificatio
- the detailed data field is a field in which detailed information about the property specified by the query property is stored. If there is no detailed information, "OxFFFFFFFF" is stored.
- the operation of the sensor node 100 and the search node 120 will be described by taking as an example the case where the sensor network of the present embodiment is applied to the management of a food storage facility.
- the storage facility has a plurality of storage units, and each storage unit is temperature-controlled so that the internal temperature corresponding to the object to be stored is maintained.
- the temperature is set to 0 ° C or lower for frozen foods, 10 ° C or lower for refrigerated foods, and around 20 ° C for foods that can be stored at room temperature.
- Each storage is provided with a sensor node 100 including a temperature sensor 103 and a humidity sensor 104 so that the situation in the storage can be measured, and is connected to the control room via a network. In such a sensor network system, it is assumed that the control computer in the control room is used as the search node 120 and only the storage that currently maintains the temperature of 20 ° C is searched.
- the address specifying unit 102 implemented as firmware of the sensor node 100 acquires the ambient temperature measured by the temperature sensor 103 as a measured value. Further, the channel table in the address table corresponding to the measured value is specified by referring to the address table stored in the table storage unit 101.
- the specifying unit 102 can specify “ff 15 :: 5: 104” which is a channel address corresponding to the section B2.
- the address update unit 105 transmits an Internet Control Message Protocol (ICMP) message addressed to "ff 15 :: 5: 104" to the router 110, and participates in the multicast channel corresponding to the section B2.
- ICMP Internet Control Message Protocol
- the address specifying unit 102 refers to the address table in the same manner, and enters the section B3 (+ 20. 5, + 21.5). Identify the corresponding channel address "ffl5 :: 5: 106".
- the address update unit 105 sends an ICMP message addressed to "ff 15 :: 5: 106" to the router 110, participates in the multicast channel for the sensor in section B3, and supports section B2 that is currently participating. An ICMP message is sent to the router 110 to leave the multicast channel.
- the sensor node 100 can enter a multicast channel corresponding to the measured value of the temperature sensor 103 independently of the search node 120.
- the channel address is stored in the address storage unit 107 and updated to the channel address specified by the address specifying unit 102. In addition, it is not necessary to perform the process of joining and leaving the channel with this update when it is not necessary.
- the measured value force acquired from the temperature sensor 103 by the address specifying unit 102 If it is stored in the memory 107 and included in the measured value corresponding to the channel address, that is, if it is included in the section corresponding to the participating channel in the address table shown in FIG. May be omitted. These determinations may be made by the address updating unit 105, for example.
- the separation process may be delayed for a predetermined time. As a result, it is possible to suppress high-frequency channel joining and leaving processing traffic that occurs when the measured value goes back and forth between adjacent sections. In addition, it is possible to maintain the participation status at least for channels that require participation.
- the search node 120 refers to the address table stored in the table storage unit 121 when it is instructed to search for the sensor node 100 having a measured value of 20 ° C, for example, by an operation with user power.
- ffl5:: 5: 104 which is the channel address corresponding to the section B2 (+ 19. 5, + 20.5).
- the search node 120 performs a search operation by transmitting inquiry data to “ffl5 :: 5: 104” and receiving response data corresponding to the inquiry data.
- An example of the inquiry data corresponding to the search of the sensor node 100 whose measured value is 20 ° C. is the inquiry data shown in FIG.
- FIG. 8 is a diagram showing a plurality of examples of data contents of inquiry data and response data in the first embodiment.
- the response data shown in FIGS. 8A to 8D has data contents corresponding to the inquiry data shown in FIGS. 8A to 8D, respectively. .
- the query generation unit 123 generates the query data shown in FIG. 8A, and the communication unit 125 transmits a UDP packet including the query data to “ff 15 :: 5: 104”.
- this inquiry data is obtained from all sensor nodes 100 storing "ff 15 :: 5: 104" as participating channel addresses, that is, "ffl5 :: 5: All sensor nodes 100 participating in the channel corresponding to “104” arrive at the sensor node 100 and are set as response data generation targets.
- FIG. 9 is a flowchart showing an operation flow relating to processing of inquiry data in the sensor node 100 according to the first embodiment of the present invention.
- the communication unit 109 of the sensor node 100 detects the arrival of the inquiry data (S21), and notifies the determination unit 108 of the destination address.
- the determination unit 108 compares the destination address of the inquiry data with the participating channel address stored in the address storage unit 107, and if they are the same (Yes in S22), notifies the communication unit 109 to that effect.
- the communication unit 109 passes the received inquiry data to the response generation unit 106.
- the response generation unit 106 analyzes the inquiry data (S23). Specifically, first, the data type in the inquiry data is referred to and it is recognized that the inquiry data is data for inquiry from the search node 120.
- the response generation unit 106 since the query property field is set to "unspecified", the response generation unit 106 simply generates response data that echoes back the query data ID (S24).
- the communication unit 109 transmits the response data with the address of the own node as the transmission source and the address of the search node as the transmission destination (S25).
- the search node 120 can receive all the sensor force response data in the channel corresponding to section B2 of the address table after a certain time. Further, the response processing unit 126 can obtain the address of each sensor node by referring to the source address included in the IP header of the response data. In addition, it is possible to check whether the received content is the result of the previous query data by checking the query data ID echoed back. The response processing unit 126 lists the addresses of the sensor nodes in the temperature state of 20 ° C ⁇ 0.5 ° C obtained from the response data and provides them to the user as search results. To complete.
- the search node 120 can be configured to store the sensor node address as a search result. From the list, the internal temperature can be maintained at around 20 ° C !, and the storage number of the storage can be provided to the user.
- the sensor node 100 whose measured value is near 20 ° C is simply searched. For example, the humidity at a location where the temperature is around 20 ° C. Can be examined with a single inquiry.
- FIG. 8B is a diagram showing an example of the data content of inquiry data when inquiring the sensor node 100 about humidity, and an example of the data content of response data to the inquiry data.
- the value "0x0001" indicating the humidity property to be investigated is specified in the query property field in the query data.
- Each sensor node receiving the inquiry data returns the humidity measured by the humidity sensor 104 in the detailed data field in the response data.
- the search node 120 obtains the humidity of the place where the temperature is around 20 ° C, it is the channel address corresponding to the section B2 (+ 19. 5, + 20. 5) in the address table.
- the inquiry data shown in Fig. 8 (B) is sent to "ff 15 :: 5: 104".
- This query data is sent to the channel corresponding to the channel address "ff 15 :: 5: 104". Received by all participating sensor nodes 100 and processed.
- the response generation unit 106 detects that the value “0x0001” indicating the humidity property is stored in the query property field in the query data.
- the response generation unit 106 acquires humidity as a measurement value from the humidity sensor 104, and generates response data including the humidity in the detailed data field.
- the response data includes, for example, humidity 4 in the detailed data field.
- Search node 120 has channel address "ffl5 :: 5
- the search node 120 can also search for a sensor node 100 whose measured value is exactly “20 ° C.” in the sensor node 100 having a measured value near 20 ° C.
- Figure 8 (C) shows an example of the data contents of the query data for searching for the sensor node 100 whose measured value is "20 ° C" and an example of the data contents of the response data for the query data.
- the search node 120 stores “0x00000014”, which is a value indicating “20. C,”, in the detailed data field, as in the query data of FIG. +20. Send to channel address "ff 15 :: 5: 104" corresponding to 5).
- the sensor node 100 participating in the channel receives this inquiry data, and the response generation unit 106 acquires the measured value from the temperature sensor 103 and confirms whether or not the force is 20 ° C.
- the response generation unit 106 When the measurement value is 20 ° C, the response generation unit 106 generates response data in which a value indicating the measurement value is stored in the detailed data field. The generated response data is transmitted to the search node by the communication unit 109.
- the response data in FIG. 8 (C) shows a case where the measured value at the sensor node 100 is 20 ° C. and “0x00000014” indicating 20 ° C. is stored in the detailed data field.
- the response data may be returned only when it is within a certain range from the search target temperature.
- including the measurement value in the response data as described above is also useful for knowing the actual measurement value on the search node 120 side.
- the response data includes the measured temperature or humidity. You may include degrees.
- response data shown in Fig. 8 (C) may be sent to the inquiry data shown in Fig. 8 (A).
- the search node 120 simultaneously searches the sensor node 100 from the sensor node corresponding to the search. It is also possible to acquire various measurement values of the above and use them in data caches to provide search results to users.
- the inquiry data and the response data may store all the information according to the measurement value corresponding to the channel used for transmission / reception.
- FIG. 8D is a diagram showing an example of inquiry data and response data in which information about measurement values corresponding to channels used for transmission and reception is stored.
- search node 120 and the sensor node 100 have the same address table, they exist independently of each other, and may be changed individually.
- the address table It is useful to inform each other about information about.
- the address table stored in the table storage unit 101 of the sensor node 100 is changed, and the measurement value corresponding to the channel address "ffl5 :: 5: 104" is (+ 19. 5, + 20. Assume that the change from 5) to (+ 18. 5, + 20. 5).
- the inquiry data in Fig. 8 (D) is addressed to the channel address "ff 15 :: 5: 104" corresponding to the interval B2 (+ 19. 5, + 2 0.5) in the address table shown in Fig. 4 This is the sent inquiry data. Therefore, it is stored in the “0x19502050” force detail data field indicating the interval B2 (+19.5, +20.5).
- the sensor node 100 participating in the channel with the channel address “ff 15 :: 5: 104” receives this inquiry data.
- the response generation unit 106 acquires a section (+18.5, +20.5) corresponding to the channel from the address table, and sends response data including “0x1 8502050” indicating the section in the detailed data field.
- the search node 120 can receive the response data and check the detailed data field to know the range of the measured temperature value in the sensor node 100 that responded. This information can be used, for example, when notifying search results to the user or the host system.
- the section (+ 19.5, + 2 0.5) notified from the search node 120 may also be used on the sensor node 100 side.
- the section corresponding to the channel may be updated to the notified section.
- the sensor network using the IPv6 network 111 as the network between the sensor node 100 and the search node 120 has been described. However, if it is a network that has multiple channels for communication, other types of networks that are capable of multicast communication are acceptable.
- P2P network a communication network for peer “two” peer (hereinafter referred to as “P2P network”) in which terminals connected to the network directly communicate with each other may be used.
- a terminal that communicates via a P2P network is called a “peer”.
- the P2P network is realized by an overlay network having a unique architecture, communication protocol, and address system.
- the sensor node 100 and the search node 120 function as peers.
- Each peer on the P2P network combines with peers of the same type according to the properties and policies of the peer, and forms a partial network called a peer group.
- the communication data addressed to the peer group functions so as to be delivered only to peers belonging to the same peer group.
- P2P networks are implemented as overlay networks with TCPZIP as the transport, and communication data addressed to the peer group in the upper layer is handled by the network layer or transport layer, which is the lower layer. It is implemented by mapping to the provided multicast communication.
- NBMA non-broadcast multiple access
- ATM Asynchronous Transfer Mode
- FIG. 10 is a diagram showing an example of the data structure of the address table when a P2P network is used as the network between the sensor node 100 and the search node 120.
- Each peer that is a constituent node of the P2P network is assigned a unique peer ID on the sensor network, and functions as a logical address on the overlay network.
- a 64-bit Universally Unique IDentifier (UUID) that each peer generates based on the data link address at startup is used.
- UUID Universally Unique IDentifier
- each peer forms a peer group according to its characteristics, forms a closed P2P network within the group, and can share information.
- Each peer group has a peer that functions as a bind point, and the peer that serves as the bind point is joined to or removed from the peer group as a central point.
- different peer groups are configured for each segment of the temperature axis.
- the bind point is used as a channel address for communication with the peer group corresponding to each segment. Peer ID is recorded.
- the search node 120 sends inquiry data to the sensor node 100 whose measurement value is "20 ° C"
- the inquiry data is addressed to the peer ID "uuid—66E512FF790EAlE 6" of the bind point. If you send ⁇ .
- the address tables shown in FIGS. 4 and 10 divide the range of measured values that can be obtained by the temperature sensor 103 into a plurality of sections, so that the measured values of the temperature sensor 103 and the channel addresses can be divided.
- the channel address may be associated with a single value or character string that does not exist in a section having a predetermined width.
- one integer may be associated with one channel address.
- the relationship may be one-to-many or many-to-one.
- the address tables shown in Figs. 4 and 10 can be obtained by the temperature sensor 103. However, the measured value that can be obtained by the humidity sensor 104 may be associated with the channel address.
- the search node 120 can acquire the temperature from the sensor node 100 installed in a place where the humidity is around 50%, for example, by one inquiry. In other words, it is possible to obtain the temperature of a place where the humidity is near 50%.
- the temperature sensor 103 and the humidity sensor 104 may be the force cited as an example of the sensor included in the sensor node 100. Other sensors may be used. Further, the sensor may be singular or plural. The object to be measured by these sensors may be the temperature inside the sensor node 100, the communication status, etc., as well as the status outside the sensor node 100.
- the address tables included in the sensor node 100 and the search node 120 are the same, they may not be the same. For example, if the address table of the sensor node 100 includes the contents of the address table of the search node 120, at least the sensor node 100 has the query data transmitted from the search node 120 in its participation. It can be correctly determined whether or not it is addressed to the channel address.
- each sensor node has an address table in which the channel address of the channel to which it participates is recorded, and the search node has an address table in which the channel address in which the sensor node to be searched participates is recorded! /, Do it! /
- the sensor node 100 makes a channel join / leave request to the router 110.
- the sensor node 100 and the search node 120 can efficiently search the sensor node 100.
- each sensor node 100 according to the temperature measurement value periodically obtained by the temperature sensor 103, it is stored in the address storage unit and stored in the participation channel. The channel address is updated.
- the search node 120 transmits inquiry data to a channel address corresponding to the search condition in accordance with an instruction from the user or the host system.
- the inquiry data transmitted from the search node 120 arrives at all the sensor nodes 100 on the network. In other words, it is the same as when inquiry data is broadcast. However, each sensor node 100 performs filtering on incoming inquiry data, and only inquiry data addressed to the participating channel address is subjected to processing for response data generation and transmission. That is, only the sensor node 100 corresponding to the search condition performs force response data generation and transmission processing.
- the search node 120 can receive only a response from the sensor node 100 force corresponding to the search condition without making a query for each sensor node 100. Can be up.
- the sensor node 100 only analyzes query data addressed to the channel to which it participates, and does not perform unnecessary processing on query data that does not require a response.
- the sensor node 100 and the search node 120 can efficiently search for the sensor node 100 using dynamic properties.
- the sensor node and the search node are connected by a communication network capable of communication through a plurality of channels such as an IPv6 network and a P2P network.
- a communication network capable of communication through a plurality of channels such as an IPv6 network and a P2P network.
- the IP multicast address or the peer ID of the bind point in P2P communication as the channel address, the measured value without managing and operating the measured value database and without querying each sensor node is shown. Only the sensor nodes that meet the search condition can be listed according to the search condition including information. In other words, it is possible to execute a search based on dynamic properties.
- each search node can change each search condition within the range of measurement values that can be obtained by the sensor node. Appropriate search results according to the search conditions can be obtained.
- settings for the search node are not required. In other words, it is possible to realize an open sensor network with high expandability.
- the wireless tag is a minute wireless IC chip used for identifying an object, and is also called “IC tag”, “RF tag” or the like.
- the wireless tag stores its own identification information and has the ability to send and receive information to and from the management system using radio waves.
- the individual identification number in a wireless tag is identification information in accordance with a numbering system in which the uniqueness of the identification number is guaranteed on a specific domain as described above. For example, it is used for RFID. EPC and so on.
- RFID is an individual identification number in the Glorenole domain that guarantees uniqueness.
- EPC there is a numbering system management organization to guarantee uniqueness, and operation is performed to assign a manufacturer ID without duplication for each manufacturer.
- FIG. 11 is a functional block diagram showing functional configurations of the ID scanner node and the search node according to the second embodiment of the present invention. The description of the same components and operations as those in the first embodiment will be omitted, and the components and operations that are characteristic of the second embodiment will be mainly described.
- IPv6 network 111 is used as the network between the search node 920 and the ID scanner node 900 as in the first embodiment.
- the ID scanner node 900 is another example of the sensor device of the present invention, and includes an ID scanner 904 as a measuring means.
- the ID scanner 904 can measure an individual identification number of a wireless tag existing within a predetermined range from the ID scanner 904 as a surrounding situation. In other words, the ID scanner 904 reads the identification information of the wireless tag by wireless communication. Thus, it is an example of a measuring means for obtaining the identification information as a measured value.
- FIG. 12 is a diagram showing an example of the data configuration of the individual identification number in the second embodiment
- the individual identification number in Embodiment 2 is a version field that specifies the format of the individual identification number, a manufacturer ID field that is guaranteed unique by the management organization on the global domain, and each manufacturer.
- Each field of the product ID field with uniqueness guaranteed on the domain and individual ID field with uniqueness guaranteed on each product domain is also configured. That is, the wireless tag 930 and the wireless tag 931 shown in FIG. 11 have different individual identification numbers.
- a wireless tag having an individual identification number having such a data structure is attached to a managed product to be managed, and a distributed product to which the wireless tag is attached is stored in a container or the like as a storage location.
- the ID scanner node 900 is attached inside each container.
- the individual identification number is read out in a non-contact manner via wireless communication by the ID scanner 904 of the ID scanner node 900 attached inside each container.
- the communicable distance between the ID scanner 904 and the wireless tag is within 3 to 5 meters. If the distance can be read).
- Each distribution product is carried into the container and carried out to the outside of the container in the course of distribution. That is, the container force is also moved to the container. Therefore, the individual identification number scanned by the ID scanner node 900 attached to each container is a dynamic property that changes with time.
- Search node 920 and ID scanner node 900 each have the same address table. Since the method for having the same address table is the same as that of the first embodiment, the description thereof is omitted.
- FIG. 13 shows an example of the address table used in this embodiment.
- FIG. 13 is a diagram showing an example of the data configuration of the address table in the second embodiment.
- Each manufacturer ID is associated with an IP multicast address as a channel address.
- the ID scanner node 900 periodically scans the inside of the container, and collects the individual identification numbers of the wireless tags attached to the products of each company housed in the container.
- the address specifying unit 102 stores the measured value obtained from the ID scanner 904, that is, the individual identification number and the channel address of the channel to which the power is also stored in the table storage unit 901! Identify.
- the address update unit 105 updates the participating channel address to the specified channel address.
- the address storage unit 107 stores a plurality of channel addresses corresponding to these manufacturer IDs.
- the search node 920 sends the inquiry data to the channel corresponding to company A, that is, to the channel address "ff 15 :: 2: 100".
- Response data can be obtained from the ID scanner node 900 installed in the container storing the.
- search node 920 of the second embodiment the inquiry data transmission and response data reception procedures are the same as in the first embodiment. Further, similarly to the fact that the search node 120 of the first embodiment can check the humidity of a place at a specific temperature with one inquiry, the search node 920 of the second embodiment , Query shown in Figure 8 (B) By using the same inquiry data as the data, the manufacturer can check the temperature, humidity, etc. in the container containing the products of Company A with a single inquiry.
- the query generation unit 123 of the search node 920 receives the query data in which "Ox 0002" indicating the temperature property is stored in the query property field. Generate. The generated inquiry data is transmitted to the channel address “ff 15 :: 2: 100” corresponding to the company A by the communication unit 125.
- the ID scanner node 900 receives the inquiry data, and the determination unit 108 determines that the inquiry data is transmitted using the channel in which the node is participating.
- the response generation unit 106 recognizes that "0x0002" indicating the temperature property is specified in the query data ID field in the query data. After the recognition, response data in which the temperature in the container obtained from the temperature sensor 103 is stored in the detailed data field is generated. The generated response data is transmitted to the search node 920 by the communication unit 109.
- the search node 920 can obtain the temperature in the container in which the products of Company A are stored in one inquiry.
- the search node 920 uses the inquiry data shown in FIG. 8 (C), and the temperature inside the container storing the products of company A, for example, the measured value is " Response data can also be received only for ID scanner node 900 at 20 ° C.
- the ID scanner node 900 recognizes that the value indicating the temperature property is stored in the query property field in the query data, and the search target temperature is stored in the detailed data field. After recognition, the temperature in the container is acquired from the temperature sensor 103, and response data is returned only when the temperature corresponds to the search target temperature. Even if the measured value does not match the search target temperature, the response data may be returned only when the search target temperature force is within a certain range.
- the search node 920 can acquire the address information of the source ID scanner node 900 from the collected response data. Therefore, for example, when the correspondence table between the ID scanner node 900 and the container number is recorded on the search node 920 side, a container group satisfying the search condition can be specified by drawing the correspondence table. [0225] As described above, in the sensor network of the present embodiment, the ID scanner node 900 attached in the container uses the individual identification number assigned to the product in the container, which is a dynamic property, as a measurement value. Can be acquired.
- the search node 920 can search using information included in the individual identification number.
- This search uses an address table in which the information and the channel address are associated with each other, does not require the same measurement value database as in the first embodiment, and requires an inquiry for each ID scanner node.
- efficient and flexible search using dynamic properties is possible.
- Such an efficient search method is also effective as a container search means in a physical distribution management system in which temperature management conditions differ for each manufacturer.
- the information associated with the channel address may not be information indicating the manufacturer, but may be a product ID, for example. In short, it is only necessary to be able to obtain measurement means such as the ID scanner 904 provided in the ID scanner node 900.
- FIG. 14 is a diagram showing a configuration outline of a sensor network in the third embodiment.
- the sensor network in the third embodiment includes a sensor network (S N2) on the IPv6 network 111, a sensor network (SN1) on the P2P network 703, and a sensor network (SN3) on the ad hoc network 708.
- S N2 sensor network
- SN1 and SN2 are examples of the first network and the second network in the relay device of the present invention, respectively.
- sensor node 100 and search node 120 described in Embodiment 1 are connected to SN2, and each of SN1 and SN3 has the same configuration as sensor node 100.
- Sensor nodes 100a and 100b, which are sensor nodes, are connected.
- the relay node 800 is an example of the relay device of the present invention, and is a device that relays inquiry data between different address tables. By using the relay node 800, it is possible to execute transparent search processing between sensor networks to which different network policies are applied.
- FIG. 15 is a functional block diagram showing a functional configuration of the relay device according to the third embodiment of the present invention.
- Relay node 800 shown in Fig. 15 (A) has a configuration in which the inquiry data transmitted from search node 120 does not include information indicating the section corresponding to the destination channel in the inquiry data It is.
- the relay node 810 shown in FIG. 15 (B) has a configuration in which the query data transmitted from the search node 120 includes information indicating the section as shown in FIG. 8 (D).
- the relay node 800 shown in Fig. 15 (A) includes a determination unit 807 that determines whether or not the transmitted inquiry data is from a participating channel, and an address table of a network that is a relay source.
- the relay source table storage unit 801 for storing the relay source address table
- the relay destination table storage unit 802 for storing the relay destination address table which is the address table of the network serving as the relay destination, and the channels described in the relay source address table
- the relay address update unit 803 that participates in the channels on all SN2s that need to be relayed and leaves the channel on SN2 that no longer needs to be relayed, supports the channels on the participating SN2 Relay address storage unit 806 for storing the channel address to be received, destination channel address of inquiry data received from the participating channel
- the section specifying unit 804 for specifying the section on the relay source address table corresponding to the inquiry data, the relay destination address table is searched using the specified section,
- a relay node 810 shown in FIG. 15 (B) is configured to include a section specifying unit 814 in place of the section specifying unit 804 in the configuration of the relay node 800 described above.
- the relay node 810 has a configuration when the inquiry data includes information indicating a section, and does not need to reverse the relay source address table. Therefore, the section specifying unit 814 specifies a section from the detailed data field of the received inquiry data and sends it to the relay destination specifying unit 805.
- the other components and their operations are the same as for relay node 800.
- Each of the section specifying unit 804 and the section specifying unit 814 is an example of a measured value specifying unit in the relay device of the present invention.
- the relay node 800 uses the relay address update unit 803 to participate in all the channels that need to be relayed among the channels with the channel addresses described in the relay source address table, and for which relaying is no longer necessary. Leave the address channel.
- the section specifying unit 804 performs reverse lookup on the relay source address table from the destination channel address of the received inquiry data, and specifies the section associated with the channel address as the destination. . Further, the relay destination specifying unit 805 searches the relay destination address table based on the specified section information, specifies the channel address to be relayed, and transfers the inquiry data.
- the intermediate node 810 specifies a section from the detailed data field of the inquiry data received by the section specifying unit 814 and sends it to the relay destination specifying unit 805 as described above.
- the subsequent operation is the same as that of the intermediate node 800.
- the intermediate node 800 stores the two address tables shown in FIGS. 4 and 11 in the relay source table storage unit 801 and the relay destination table storage unit 802, respectively. These two The inquiry data received from the search node 120 on the SN2 side is appropriately relayed to the SN1 side.
- the relay node 800 needs to receive and analyze the inquiry data transmitted from the search node 120. Therefore, the relay node 800 participates in all channel address channels that need to be relayed among the channel addresses listed in the relay source address table, and leaves the channel address channel that no longer requires relaying. I do.
- the channels that need to be relayed and the channels that do not need to be relayed are determined by the relay policy and set in the relay node. If updating is required, an instruction may be given to the relay address updating unit 803 directly or via a network. Further, the instruction subject may be the search node 120.
- FIG. 16 is a flowchart showing an operation flow related to relay of inquiry data in the relay node according to the third embodiment of the present invention.
- FIG. 16A is a flowchart showing an operation flow related to relay of inquiry data in relay node 800 of FIG. 15A.
- the determination unit 807 of the relay node 800 detects the arrival of the inquiry data (S31)
- the destination address of the inquiry data is compared with the participation channel address stored in the relay address storage unit 806. If they match as a result of the comparison, it is determined that the inquiry data is addressed to the participating channel address (Yes in S32), and the inquiry data is passed to the section specifying unit 804.
- the section specifying unit 804 performs reverse lookup on the relay source address table stored in the relay source table storage unit 801 from the destination channel address of the inquiry data, and specifies the corresponding section (S33).
- the relay destination identification unit 805 uses the information indicating the received section to store the relay destination table.
- the relay destination address table stored in the part 802 is searched and the SN corresponding to the section is searched.
- the channel address above 1 is specified (S40).
- Transfer section 808 transmits inquiry data addressed to the channel address on SN1 identified by relay destination identifying section 805 (S41).
- FIG. 16B is a flowchart showing an operation related to relay of inquiry data in relay node 810 shown in FIG. 15B.
- the operation related to relay of inquiry data in relay node 810 is as follows. The only difference is the operation to specify the section corresponding to the query data (S34).
- the inquiry data destination is converted to the channel address on SN1 corresponding to the inquiry data, and is relayed correctly.
- the inquiry data relayed to the SN1 side is delivered to the sensor node 100a via the peer group corresponding to the inquiry data.
- the search node 120 in which "20 ° C" is specified as a search condition by the user refers to the address table shown in FIG. 4, and the channel address corresponding to "in 20" '15:: 5: 104 "Is acquired as the destination address of the inquiry data. In addition, the inquiry data is sent to the channel address.
- the relay node 800 that has received the inquiry data confirms that the channel power it is participating in has also been transmitted. After confirmation, the section identification unit 814 identifies section 2 (+ 19. 5, + 20. 5) corresponding to the channel address “ffl5 :: 5: 104” by reverse lookup of the address table shown in FIG. To do.
- the relay destination identification unit 805 refers to the address table shown in Fig. 5 from the identified section B2 (+ 19. 5, + 20.5), and binds to the appropriate peer group on the SN1 side. Identify the peer ID of "uuid—66E512FF790EA1E6".
- the transfer unit 808 Inquiry data is sent to the point.
- the inquiry data received at the bind point on SN1 is processed by the sensor node 100a in the peer group corresponding to the bind point, and the response data is returned to the search node 120.
- a search across sensor networks having different network address assignment policies can also be executed transparently by the relay node 800.
- the search node 120 and the sensor node 100 each need to perform processing to fill in the difference in the address table due to different networks that do not need to be aware of what kind of network the partner node is on. Absent. Also, it is clear that the effect is not lost even when the relay node 810 is used.
- the present embodiment is a mode in which communication is performed between sensor networks having different network address allocation policies as described above. For this reason, there may be cases where the measured values and intervals in the address tables are different.
- the inquiry data and the response data as shown in FIG. 8 (D) are transmitted and received, so that the address table actually used in each network is transmitted.
- the address table actually used in each network is transmitted.
- SN3 is a narrow-area sensor network configured by the ad hoc network 708, and can communicate with SN2 via the relay node 800.
- relay node 800 that relays communication between SN2 and SN3 does not need to have a relay destination address table.
- the relay node 800 receives the query transmitted from the search node 120. Transfer the combined data to each search node on SN3.
- the search node 120 is connected to the SN2 on the IPv6 network 111 and searches for the sensor node 100a on the SN1.
- the search node 120 may be connected to SN 1 and search for the sensor node 100 on SN2.
- relay node 800 that relays communication between SN2 and SN1 can correctly send inquiry data transmitted from SN1 to SN2 by switching the relay source address table and the relay destination address table.
- the sensor node has the same configuration as the sensor node 100.
- the ID scanner node 900 of the second embodiment may be used. That is, the features of the present invention are not impaired by the measurement target of the sensor node and the type of measurement value.
- the present invention can be applied to a system or the like that searches for dynamic properties in a sensor network in which one or more sensors are connected via a network.
- a sensor network in which one or more sensors are connected via a network.
- wide-area sensor networks where the importance of scalability is more important, such as state management of food and chemical substances, distribution management, monitoring of the natural environment such as weather and temperature, situation surveys at the time of disasters, etc. It can be applied to a wide range of fields, such as narrow-area sensor networks for applications and sensor networks whose position information fluctuates.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Computer And Data Communications (AREA)
- Small-Scale Networks (AREA)
- Mobile Radio Communication Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800087080A CN1934598B (zh) | 2004-12-24 | 2005-12-20 | 传感设备、检索设备和中继设备 |
US10/592,781 US7917570B2 (en) | 2004-12-24 | 2005-12-20 | Sensor device which measures surrounding conditions and obtains a newly measured value, retrieval device which utilizes a network to search sensor devices, and relay device which relays a communication between the sensor device and the retrieval device |
JP2006521335A JP4851324B2 (ja) | 2004-12-24 | 2005-12-20 | センサ機器、検索システム、通信方法、およびプログラム |
Applications Claiming Priority (2)
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JP2004-372935 | 2004-12-24 | ||
JP2004372935 | 2004-12-24 |
Publications (1)
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WO2006068112A1 true WO2006068112A1 (ja) | 2006-06-29 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/023318 WO2006068112A1 (ja) | 2004-12-24 | 2005-12-20 | センサ機器、検索機器、および中継機器 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7917570B2 (ja) |
JP (1) | JP4851324B2 (ja) |
CN (1) | CN1934598B (ja) |
WO (1) | WO2006068112A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US7917570B2 (en) | 2011-03-29 |
JP4851324B2 (ja) | 2012-01-11 |
US20080240160A1 (en) | 2008-10-02 |
JPWO2006068112A1 (ja) | 2008-06-12 |
CN1934598A (zh) | 2007-03-21 |
CN1934598B (zh) | 2011-07-27 |
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