KR100938471B1 - Discovery engine for resource sharing using wireless sensor network, the discovery metohd and the registration method thereof - Google Patents

Abstract

The shared resource search system using the wireless sensor network according to the present invention includes a service search user for requesting a shared resource data service; A service search engine searching for a shared resource data service requested by the service search user in a shared peripheral resource device and providing a corresponding result; And an interaction adapter for transmitting and receiving a result searched by the service search engine to a shared peripheral device, wherein the service search engine includes: a primitive for providing a shared resource service requested by the service search user; A message processor that performs message reception and transmission on information of the requested shared resource service; It is characterized in that it comprises a peripheral information management unit for managing the shared peripheral resource device information.

The shared resource searching system, the searching method, and the registering method using the wireless sensor network of the present invention can be provided with information and services by searching for shared resources around the wireless sensor network.

Wireless sensor network, shared resources, service discovery engine

Description

DISCOVERY ENGINE FOR RESOURCE SHARING USING WIRELESS SENSOR NETWORK, THE DISCOVERY METOHD AND THE REGISTRATION METHOD THEREOF}

The present invention relates to a system for searching for a shared resource using a wireless sensor network, a method for searching for the same, and a method for registering the same. In particular, the present invention can provide information and services by searching for a shared resource around the wireless sensor network. A resource search system, a search method thereof, and a registration method thereof.

Conventionally, in the service discovery method provided based on a wireless sensor network, methods related to service provision and discovery through a sensor provided by the wireless sensor network have been proposed.

In a ubiquitous environment, you need to be able to get the information and computing power you need anywhere, anytime. In order to use such information and services, a function for properly searching for desired information and services from various devices scattered around and a function for acquiring discovered information are required.

However, most of the devices that want such services are mobile devices, which require low power consumption and small size for continuous service.

SUMMARY OF THE INVENTION An object of the present invention is to provide a system for searching for shared resources using a wireless sensor network, a search method, and a registration method, which can receive information and services by searching for shared resources in the vicinity using a wireless sensor network.

In addition, an object of the present invention is to provide the relative distance information necessary for determining the appropriateness of the use of the shared information obtained by using the relative distance measurement method based on the wireless signal strength obtained in the process of acquiring the shared information of the surroundings.

In order to achieve the above object, a shared resource search system using a wireless sensor network according to the present invention includes a service search user requesting a shared resource data service; A service search engine searching for a shared resource data service requested by the service search user in a shared peripheral resource device and providing a corresponding result; Its feature is that it includes an interaction adapter for transmitting and receiving the results retrieved by the service search engine to the shared peripheral device.

The service search engine may include a primitive for providing a shared resource service requested by the service search user; A message processor that performs message reception and transmission on information of the requested shared resource service; A peripheral information manager configured to manage the shared peripheral resource device information; It is preferable to include a location information engine for providing the location information by grasping the distance measurement with the peripheral device providing the shared resource data service.

The primitive may include a request primitive receiving a request of a service search user, a confirmation primitive returning a result performed by the request primitive to a service search user, a notification primitive informing the service search user of the generated event, and the notification. It is preferred to include a response primitive that conveys the processing result of the primitive to the shared device.

Here, the location information engine preferably provides relative distance information between devices by using the strength of a wireless signal provided by the interaction adapter in the process of the message processor transmitting and receiving messages with surrounding devices.

In addition, in order to achieve the above object, a method of searching for shared resources using a wireless sensor network according to the present invention includes: receiving a request for a shared resource service from a higher layer; Checking a search mode parameter value of the upper layer and then switching to the identified search mode; Searching for a peripheral device using the corresponding search mode; Retrieving shared resource information of the discovered peripheral device; It is characterized in that it comprises the step of acquiring the retrieved shared resource information.

Herein, the mode is switched to a directory mode or a peer-to-peer mode according to the search mode parameter value of the upper layer, and the directory mode stores meta information on shared resource services provided by neighboring shared devices. Collected and provided to the node, the peer-to-peer mode preferably provides the meta-information on the shared resource service provided by neighboring shared devices directly to the corresponding device.

In addition, the shared resource registration method using the wireless sensor network according to the present invention to achieve the above object, the step of generating a registration service primitive by the upper layer; Receiving, by the service search engine, the generated primitive and registering shared service information of a peripheral device according to a designated parameter value; and registering the shared service information in the directory mode according to the designated parameter value. The feature is that a shared service is registered in a directory, and in the peer-to-peer mode, shared service information is transmitted to neighboring peer nodes.

In this case, after registering the shared service information, the method may further include modifying the shared service information or updating the changed contents.

The shared resource searching system, the searching method, and the registering method using the wireless sensor network of the present invention can be provided with information and services by searching for shared resources around the wireless sensor network.

In addition, the present invention can obtain the relative distance information necessary for determining the appropriateness of the use of the shared information obtained by using the relative distance measurement method based on the wireless signal strength obtained in the process of acquiring the surrounding shared information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. It is not.

1 is a diagram schematically illustrating a structure of a shared resource discovery system using a wireless sensor network of the present invention. As shown in FIG. 1, the shared resource search system includes a service search user 110 requesting a shared resource data service; A service search engine (120) for searching the shared resource data service requested by the service search user (110) in a shared peripheral resource device and providing a corresponding result; The interaction adapter 130 transmits / receives a result searched by the service search engine 120 to a shared peripheral device.

The service discovery user 110 requests a shared resource service for devices shared in a wireless sensor network, which is composed of a higher layer or other components.

The service discovery engine 120 performs primitives 121, 122, 123, and 124 for providing a shared resource service requested by a service discovery user, and receives and transmits a message regarding information on the requested shared resource service. Determine a distance measurement between a message processor 125, a neighbor manager 126 managing the shared peripheral resource device information, and a peripheral device providing the shared resource data service It is configured to include a location information engine (Localization Engine) 127 for providing location information.

The primitives 121, 122, 123, and 124 are for interfacing with a higher layer or another component that is the service discovery user 110, and request primitives 121 for performing functions by receiving the request of the service discovery user 110. Confirm primitives 122 for returning the result performed by the request primitive 121 to the service discovery user, and an indication primitive 123 for notifying the service discovery user of an event generated such as receiving a message. ) And a response primitive 124 for transmitting the processing result of the notification primitive 123 to the counterpart sharing device.

The message processor 125 converts a request of a service discovery user through a primitive call into a service discovery message, and then delivers the received message to an adjacent device through the interaction adapter 130. It interprets the Service Discovery Message and invokes the appropriate notification primitive.

The neighbor manager 126 provides information such as ID, U-MO ID, Operation Mode (Directory mode or Peer-to-peer mode), status, and network address of peripheral devices. Manage.

The location information engine (Localization Engine) 127 calculates location information between devices used as basic data for the situational awareness function of shared resource use. In addition, in the process of the message processor transmitting and receiving messages with the peripheral devices, providing the relative distance information between the devices to the service discovery user by using the strength (RSSI) of the radio signal provided by the interaction adapter 130. desirable.

In the meantime, the situation recognition through the relative position recognition based on the signal strength of the location information engine 127 is obtained by using a relative distance measuring method calculated using a wireless sensor network communication signal obtained in the process of acquiring neighboring shared information. It provides the relative distance information necessary for determining the adequacy of the use of shared information. This location recognition allows the best judgment to meet the needs of the user among a plurality of acquired shared information.

More specifically, a wireless sensor network configured using IEEE 802.15.4 uses Link Quality Indication (LQI) obtained by PD-DATA.indication delivered from the PHY layer to the MAC layer. This value has a value from 0x00 to 0xff and the obtained value is delivered for use by higher layers of the service search engine. Therefore, the upper layer can obtain the relative distance between itself and the counterpart node, and can use this to select a suitable shared resource using the distance information between the plurality of obtained shared resources.

2 is a flowchart illustrating a method for searching for shared resources using a wireless sensor network according to the present invention. First, a step of requesting a shared resource service around by a higher layer is performed (S201). More specifically, a device that wants to use a shared resource or a device that wants to share its resource to another device starts a service using a DE-START-SERVICE primitive. These primitives are generated by higher layers for the device to specify the mode of operation, role, etc. for service sharing.

Subsequently, after checking the search mode parameter value of the upper layer, a step of switching to the identified search mode is performed (S202). More specifically, when the DE-START-SERVICE.request primitive is called by the upper layer, the service search engine 120 first checks a mode parameter. For example, if the value of the mode parameter is 0x00, the deServiceDiscoveryMode value of the Discovery Engine Information Base (DEIB) is set to 0x00, and then the device is determined to be the directory mode according to the value of the StartAsDirectory parameter, and if the mode parameter value is 0x01, After setting the value of deServiceDiscoveryMode to 0x01, it determines the peer-to-peer mode to search for peer nodes around.

3 is a diagram illustrating a shared resource discovery mode using a wireless sensor network according to the present invention. As illustrated in FIG. 3, the directory mode collects meta information of various shared services provided by neighboring shared devices and returns a search result according to a shared service search request. It is a method of providing a service by using a directory node to be executed. That is, a device that wants to use a shared resource around the device searches for a directory node existing in its vicinity to use a shared service provided by another device, and retrieves a list of available shared services from the searched directory. When the service is found to be used, information on a device providing the shared service may be acquired and the service may be used through communication with the device using the information.

This method provides a way to quickly discover shared resources through a wireless sensor network in the vicinity when a new device that wants to use the service approaches to use the shared resources, thus consuming time and energy to find each shared resource. Can be reduced.

All devices in the periphery of the peer-to-peer mode may request meta-information about services that each of the devices that the neighboring devices can provide, and request the request. Received devices provide meta-information for all shared services that they can provide for this request. In this case, unlike the directory mode, the peer-to-peer mode does not have a node that serves as a directory. In this way, in a service environment configured in a temporary time and space, it is possible to search and use shared resources provided by other devices directly without configuring a shared resource network by a directory.

In operation S203, a peripheral device is searched using the corresponding discovery mode. That is, the search is performed in the directory mode or the peer-to-peer mode according to the determination of the shared resource search mode.

More specifically, in the directory mode, if the value of the StartAsDirectory parameter is not (False), the service search engine 120 sets the value of the status parameter to INVALID_REQUEST when the device does not operate as a directory when a primitive is received. -Ends processing after sending a START-SERVICE.confirm primitive.

In order for the device to operate in directory mode, the service discovery engine 120 sets the value of DEIsDirectory of the DEIB to TRUE and includes a DE- containing its ID to inform neighboring devices that a new directory exists. Send a DIRECTORY-ADV message.

Also, in peer-to-peer mode, searching for a peer node sends a DEM-PEER-REQUEST message including the UssId parameter, and sends a DEM-PEER-RESPONSE message for the time specified in the ScanDuration parameter. Wait for a response. If the value of the UssId parameter is NULL, all neighboring peer nodes are searched. If not, only peer nodes with the same UssId are searched. When the DEM-PEER-RESPONSE message is received, the service search engine adds the corresponding peer node information to the DENeighborList of the DEIB using the received message information, and the number of peer node information added to the deNeighborList of the DEB ends with DEC_NEIGHBOR_LIST_SIZE. If so, the search process ends.

When the peer node search process is completed, the service discovery engine 120 issues a DE-START-SERVICE.comfirm primitive. The value of the status parameter is NO_PEER_NODE when the number of peer node information stored in deNeighborList is 0. In this case, set START_AS_PEER_NODE and set the value of the UssIdList parameter to the list of all UssIds retrieved from deNeighborList.

Thereafter, searching for shared resource information of the discovered peripheral device is performed (S204). More specifically, a method for retrieving shared service information registered in a directory or retrieving shared service information provided by neighboring peer nodes in order to use a shared service of a nearby device is a DE-SEARCH-SERVICE primitive. Use them. These primitives are generated by higher layers when a device attempts to retrieve shared service information registered in surrounding directories in directory mode or to retrieve shared service information provided by neighboring peer nodes in peer-to-peer mode.

Upon receiving the primitive, the service search engine 120 may search for a shared service provided by nearby devices according to a designated UssId parameter value. Here, the UssId parameter specifies an identifier of a USS to search for a shared service.

First, when the DE-SEARCH-SERVICE.request primitive is called by the upper layer, the service discovery engine first sends a DEM-SERVICE-REQUEST message for all peer nodes in the deNeighborTable in the case of P2P_MODE by referring to the deServiceDiscoveryMode of DEIB. , wait for the result of the service search request for deWaitResponseTime.

When the service search result message is received, the meta information of the shared service of the target device is extracted from the received search result message and added to the ServiceMetaInfoList. If there is no search result message received after deWaitResponseTime expires, DE-SEARCH-SERVICE.confirm with the status parameter NO_PEER_NODE is issued. Otherwise, DE with the status parameter success Generate SEARCH-SERVICE.confirm and terminate the process.

At this time, when the value of the deServiceDiscoveryMode of the DEIB is the directory mode, if there is no directory information stored in the deNeighborTable of the DEIB, a DE-SEARCH-SERVICE.confirm with the status parameter value NO_DIRECTORY is generated and the process ends.

On the other hand, if one or more directory information is stored in deNeighborTable, the service search engine sends a DEM-SEARCH-REQUEST message to each directory that matches the UssId given by the host, and if the host does not define a specific UssId, Send search request messages to all directories.

After sending the message, it waits for the service search result for deWaitResponseTime. When deWaitResponseTime expires or receives a service search failure message, the directory information is deleted from deNeighborTable.

Here, when the service search result message is received, the received content is added to the deNeighborList, and the meta- information about the shared service of the target device is extracted from the search result message and added to the ServiceMetaInfoList. After performing the search procedure on all desired directories, it is determined whether the registration is successful and if none is successful, DE-SEARCH-SERVICE.confirm with the status parameter NO_DIRECTORY is issued. Otherwise, the status parameter is successful. After DE-SEARCH-SERVICE.confirm occurs, terminate the process.

In operation S205, the acquired shared resource information is acquired. That is, the method for obtaining detailed information on the shared service in order for the corresponding device to use the shared service of the neighboring device uses DE-GET-SERVICE primitives. These primitives are generated by higher layers to obtain detailed information about the shared service that the device intends to use based on the meta information collected by the device using the DE-SEARCH-SERVICE primitive.

More specifically, upon receiving the primitive, the service search engine transmits a QueryString parameter to inquire detailed information about the shared service of the device corresponding to the designated UmoId parameter. Here, the UmoId parameter designates an identifier of a device to search for shared service detailed information. QueryString parameter specifies a query for querying shared service details. At this time, when QueryString is NULL, detailed information about all shared services is retrieved.

When the DE-GET-SERVICE.request primitive is called by the upper layer, the service search engine first finds the address of the device to be searched from the UmoId parameter and transmits a get service message to the corresponding device. Here, the Get service message includes its USS ID, device ID, and QueryString.

The service search engine 120 then sends a message and waits for the result of the service inquiry request for deWaitResponseTime. At this time, when the service inquiry result message is received, service information on the shared service of the target device is extracted from the received search result message.

On the other hand, if there is no search result message received after the expiration of deWaitResponseTime, DE-GET-SERVICE.confirm that fails the value of the status parameter occurs. Otherwise, the status parameter value is successful and the ServiceInfo parameter Generates DE-GET-SERVICE.confirm with the value of extracted service information and terminates the process.

4 is a flowchart illustrating a method for registering a shared resource using the wireless sensor network of the present invention. As shown in FIG. 4, first, a registration service primitive is generated by an upper layer (S401).

To provide a shared service, the DE-REGISTER-SERVICE primitive is used to register information about its shared service in the directory. These primitives are generated by higher layers when a device tries to register its shared service in a nearby directory.

Thereafter, receiving the generated primitive and registering the shared service information of the peripheral device according to the designated parameter value (S402).

Upon receiving the primitive, the service search engine registers information about its shared service in the directory in order to provide a shared service to nearby devices according to specified parameter values. The UssId parameter specifies a USS identifier of a directory in which service meta information is registered. In order to search a directory having a specific USS ID, an upper layer may specify a value of a parameter. If the value of the parameter is NULL, the upper layer registers its service meta information in all directories searched in the service start process.

After registering the shared service information, the shared service information is corrected or the changed contents are updated (S403).

More preferably, the device may modify DE-UPDATE-SERVICE primitives to modify its shared service information registered in the directory or to notify neighboring peer nodes of the change in order to provide a shared service to nearby devices. use. These primitives are higher layers when the device attempts to modify its shared service information registered in neighboring directories in directory mode or to notify neighboring peer nodes that its shared service information has been modified in peer-to-peer mode. Raises.

Upon receiving the primitive, the service discovery engine sends modifications to its directory by modifying its shared service according to the specified parameter values or notifies neighboring peer nodes of the change.

When the DE-UPDATE-SERVICE.request primitive is invoked by the higher layer, the service discovery engine first references its deServiceDiscoveryMode and sends a DEM-SERVICE-UPDATED message if it is 0x01 (peer-to-peer mode). It informs the surrounding peer nodes that the information has been modified, and issues a DE-UPDATE-SERVICE.confirm that succeeds in the status parameter, then terminates the process.

  On the other hand, if the value of deServiceDiscoveryMode is 0x00 (directory mode), if there is no directory information for registering its shared service in the DENeighborTable of DEIB, then DE-UPDATE-SERVICE.confirm with the status parameter value NO_DIRECTORY occurs and terminates the process. do.

If there is more than one directory information for registering its shared service in deNeighborTable, the service search engine transmits ServiceUpdateInfo provided from the upper layer to the corresponding directories.

The service discovery engine then sends a service update message to that directory and waits for the result of the service modification during deWaitResponseTime. When deWaitResponseTime expires or receives a service modification failure message, the directory information is deleted from deNeighborTable. After performing the modification procedure on all desired directories, it is determined whether the modification was successful. If none is successful, DE-UPDATE-SERVICE.confirm with the status parameter NO_DIRECTORY is issued. Otherwise, the status parameter is successful. Generates DE-UPDATE-SERVICE.confirm and terminates the process.

As described above, an embodiment of the present invention has been disclosed through the detailed description and the drawings. The terms are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a diagram schematically illustrating a structure of a shared resource discovery system using a wireless sensor network of the present invention.

2 is a flowchart illustrating a method for searching for shared resources using a wireless sensor network according to the present invention.

3 is a diagram illustrating a shared resource discovery mode using a wireless sensor network according to the present invention.

4 is a flowchart illustrating a method for registering a shared resource using the wireless sensor network of the present invention.

<Description of the symbols for the main parts of the drawings>

110 --- service navigation user

120 --- Service Search Engine

125 --- message processor

126 --- Peripheral Information Management Department

127 --- Geolocation Engine

130 --- interaction adapter

Claims (21)

A service search user for requesting a shared resource data service; A service search engine searching for a shared resource data service requested by the service search user in a shared peripheral resource device and providing a corresponding result; An interaction adapter for transmitting and receiving the results retrieved from the service search engine to a shared peripheral device, The service search engine, A primitive for providing a shared resource service requested by the service search user; A message processor that performs message reception and transmission on information of the requested shared resource service; And a peripheral information manager configured to manage the shared peripheral resource device information. The method of claim 1, wherein the service search engine, And a location information engine for providing location information by determining a distance measurement with a peripheral device providing the shared resource data service. The method of claim 2, wherein the primitive includes: a request primitive receiving a request of a service search user, a confirmation primitive returning a result performed by the request primitive to a service search user, and a notification primitive informing the service search user of the generated event. And a response primitive for transmitting a result of processing of the notification primitive to a shared device. The method of claim 2, The peripheral information management unit is a shared resource search system using a wireless sensor network, characterized in that for managing the ID, U-MO ID, operation mode, status, network address information of the peripheral devices. The method of claim 2, The location information engine searches for shared resources using a wireless sensor network that provides relative distance information between devices using the strength of a wireless signal provided by the interaction adapter in a process of transmitting and receiving a message with peripheral devices by the message processor. system. The method of claim 1, And the service discovery user is an interface including an upper layer or another component. A method of performing a service discovery engine of a shared resource discovery system using a wireless sensor network, Receiving a request for surrounding shared resource service from an upper layer; Checking a search mode parameter value of the upper layer and then switching to the identified search mode; Searching for a peripheral device using the corresponding search mode; Retrieving shared resource information of the discovered peripheral device; And obtaining the retrieved shared resource information. The method of claim 7, wherein And searching for a directory mode or a peer-to-peer mode according to a search mode parameter value of the upper layer. The method of claim 8, The directory mode is a method of searching for shared resources using a wireless sensor network, characterized in that to collect and provide to the directory node meta information on shared resource services provided by the surrounding shared devices. The method of claim 8, The peer-to-peer mode is a method of searching for shared resources using a wireless sensor network, characterized in that it provides meta information on shared resource services provided by neighboring shared devices directly to the corresponding device. The method of claim 7, wherein When the search mode parameter value is a directory mode of 0x00, a shared resource search method using a wireless sensor network, wherein the parameter value is set in a search engine and a message indicating that a directory exists is transmitted to neighboring devices. . The method of claim 7, wherein When the discovery mode parameter value is a peer-to-peer mode of 0x01, the shared resource search using the wireless sensor network comprises setting a parameter value in a search engine, searching for neighboring peer nodes, and transmitting a request message. Way. The method of claim 12, wherein the search for the neighboring peer node, Transmitting a request message including a higher layer ID parameter; Waiting for a response to the transmitted message; Adding peer node information to a search engine when the response is received; Terminating the search if the number of peer node information is equal by comparing the number of lists stored in a search engine; And when the search is completed, the search engine sends a confirmation primitive. The method of claim 7, wherein the searching of the shared resource information of the searched peripheral device comprises: in the directory mode, if one or more directory information is stored in a search engine, the search engine searches for each directory that matches a user ID of a higher layer. A method of searching for shared resources using a wireless sensor network, comprising: transmitting a service search request message and receiving a search result message to extract meta information of a shared resource service of a corresponding device; The method of claim 7, wherein the searching of the shared resource information of the discovered peripheral device comprises: in the peer-to-peer mode, a service search request message to all peer nodes existing in the neighbor information management list of the search engine. A method of searching for shared resources using a wireless sensor network, comprising: transmitting and receiving a search result message to extract meta information about a shared service of a corresponding device. The method of claim 7, wherein the obtaining of the retrieved shared resource information comprises: When the service acquisition request primitive is received by the upper layer, the search engine transmits an acquisition service message for searching for sharing detailed information to the corresponding device. The method of claim 16, The acquiring service message includes a USS ID, a device ID, and a query string. The upper layer generating a registration service primitive; Receiving, by the service search engine, the generated primitive and registering shared service information of the peripheral device according to a designated parameter value; In the step of registering the shared service information, The method of registering a shared resource using a wireless sensor network, wherein a shared service is registered in a directory according to the designated parameter value, and shared service information is transmitted to neighboring peer nodes in a peer-to-peer mode. . delete The method of claim 18, After registering the shared service information, The method of registering a shared resource using a wireless sensor network further comprising the step of modifying the shared service information or updating the changed contents. The method of claim 20, wherein in the updating step: In the case of the directory mode, it checks whether the shared service is registered in the directory, transmits the update information to the directory, and updates it, and in the peer-to-peer mode, notifies the neighboring peer node of the update information about the shared service information. Shared resource registration method using a wireless sensor network.

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