KR100948830B1 - Method and Apparatus for hierarchily communicating information using cache server - Google Patents

Abstract

The present invention relates to a system for transmitting and receiving information hierarchically between a user and an information providing server for providing information requested by the user. The hierarchical information transceiving system detects whether there is corresponding information in the internally mounted first cache when the user receives the information request message transmitted through the terminal, and if there is no information, the sensor node and at least one sensor node transmitting the information request message. When the information request message is received from the second cache, whether there is information corresponding to the internal cache is searched and if there is no information requesting server, the information is received and transmitted to the sensor node, and the second cache is updated. Contains a cache server.

Sensor node, hierarchical information transmission and reception

Description

Method and system for hierarchical information transmission and reception using cache server {Method and Apparatus for hierarchily communicating information using cache server}

The present invention relates to a method and system for transmitting and receiving information hierarchically using a cache server when a terminal requests data through a sensor node.

More specifically, in a crowded place such as an airport, a railway station, a subway station, a museum, an art gallery, an amusement park, a high level that may occur when a personal terminal requests a large amount of data through a RFID (radio frequency identification) tag or a sensor node The present invention relates to a method and system for transmitting and receiving information that can solve a bottleneck to a management server.

The present invention is derived from the research conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2005-S-106-02, Project Name: Sensor Tag for RFID / USN] And sensor node technology development].

Conventionally, in order to find relevant information in an airport, subway station, museum, art gallery, amusement park, etc., it is possible to obtain standardized information already input by using an RFID tag or to use the same information that is broadcast to many people, or through wireless Internet. You must get the information.

In addition, even such information is often not suitable for traffic information that can change in real time or unnecessary information is often delivered to people, such information is often mistaken as an individual spam and loses its value as information.

The present invention is directed to a personalized service that provides only the information desired by an individual and does not provide unwanted information, and proposes a method of solving a large amount of data necessary for such a personalized service using a cache server having a hierarchical structure. do.

In the present invention, by transmitting and receiving information in a hierarchical manner, the bottleneck caused by the direct information request to the final information providing server can be reduced. To this end, in the present invention, the cache server performs a role of transmitting and receiving information in the middle between the terminal and the final information providing server, and the sensor node between the terminal and the cache server plays another role as a cache server, and thus the terminal to the final information providing server. Reduce bottlenecks caused by direct information requests.

According to the present invention, a bottleneck caused by a direct information request from a terminal to a final information providing server can be greatly reduced, and radio resource utilization is also increased.

In the present invention, the sensor node between the terminal and the cache server serves as another cache server, thereby reducing the bottleneck between the sensor nodes and the cache server.

That is, due to the hierarchical access method proposed in the present invention, the bottleneck caused by the terminal directly accessing the final information providing server can be greatly reduced and the radio resource utilization can be increased.

In addition, the information provision server improves efficiency in resource management by exchanging information only between cache servers. In addition, the amount of data transmission between the cache server and the sensor node is also reduced, so the bottleneck in this section is greatly reduced.

In a preferred embodiment of the present invention, a system for transmitting and receiving information hierarchically between a user and an information providing server providing information requested by the user may include an internally mounted system upon receiving an information request message transmitted by a user through a terminal. A sensor node for searching whether there is information corresponding to one cache and transmitting the information request message if there is no information; And receiving the information request message from at least one sensor node, searching whether there is information corresponding to the internally mounted second cache, and if not, requesting the information providing server to receive and transmit the information to the sensor node. It includes; cache server for updating the second cache.

In another preferred embodiment of the present invention, the cache server for transmitting and receiving information hierarchically between the information providing server for providing information requested by the user through the terminal receives the user's information request message through the sensor node, the information Transmitting and receiving unit for transmitting information corresponding to the request message; A cache unit for storing data about frequently used information among the data of the information providing server, and performing an update according to a change in data about frequently used information in the information providing server; and upon receiving the information request message. A search unit for searching whether there is information corresponding to the cache unit, transmitting the information to the transceiver unit if there is information, and requesting the information providing server and transmitting the received information to the transceiver unit if there is no information corresponding to the cache; It includes.

In another preferred embodiment of the present invention, a method for transmitting and receiving information hierarchically between a user and an information providing server providing information requested by the user includes: (a) a sensor node for an information request message transmitted by a user through a terminal; At reception, searching for whether there is information corresponding to the first cache mounted in the sensor node and transmitting the information request message if there is no information; (b) retrieving whether there is information corresponding to a second cache mounted in the cache server when the cache server receives the information request message from at least one sensor node; (c) requesting the information providing server to receive the corresponding information and updating the second cache when there is no corresponding information in the searching step; and (d) receiving the information received from the information providing server. Transmitting to the node.

In another preferred embodiment of the present invention, a method for transmitting and receiving information hierarchically between information providing servers providing information requested by a user through a cache server through a cache server may be performed. Receiving an information request message; Storing data for information with high usage frequency among data of the information providing server in the cache server, and performing updating according to a change of data for information with high usage frequency in the information providing server; Retrieving whether there is information corresponding to the cache server when the cache server receives the information request message, and transmitting the information to the sensor node if there is information; And if there is no corresponding information as a result of the search, requesting the information providing server to receive the information and transmitting the information to the sensor node.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 illustrates a system for transmitting and receiving information hierarchically as a preferred embodiment of the present invention.

The system includes a terminal 110, a sensor node 120, a cache server 130 and an information provision server 140.

The terminal 110 includes a wireless communication device such as a mobile phone, a PDA, etc. capable of transmitting and receiving text messages and multimedia messages. The terminal must have a built-in means for performing a function of an RFID chip or a sensor node in order to be able to perform communication and receive information.

The terminal 110 requests information from the information providing server 140 through the sensor node 120 installed within a range capable of wireless communication in order to request information desired by a user. The user sends an information request message by inputting a keyword of information required for the terminal.

The sensor node 120 or the RFID reader installed within a range capable of wireless communication with the terminal receives an information request message and searches for information corresponding to a cache in the sensor node. If the corresponding information cannot be found as a result of the search, an information request message is transmitted to the cache server 130.

The sensor node 120 may store information frequently used in an internal cache. In addition, the sensor node 120 may dynamically allocate the cache according to the amount of information required by the terminals within the wireless communication range. In this case, each sensor node needs only a small amount of memory because it only needs to store information required by the terminal capable of performing wireless communication with itself.

In addition, since the memory size of the cache in the sensor node used to cache frequently used information is limited, it must be shared (more clearly) with the programs running on each sensor node.

The sensor node 120 serves as a medium for information communication between the terminal 110 and the cache server 130. First, the sensor node 120 first searches whether its information corresponds to the information request message received from the terminal 110 in its own cache and transmits the information request message to the cache server 130. Afterwards, the sensor node 120 receives the corresponding information from the cache server 130, updates its own cache, and transmits the information to the terminal 110.

In addition, in the present invention, the terminal 110 preferentially receives the stored information through the sensor node 120 or the RFID reader, and may receive the information stored in the cache server 130 when more detailed information is needed. In this case, if more detailed information is required, the information request server 140 requests the information.

When the cache server 130 receives an information request message from at least one sensor node 120, the cache server 130 searches for whether there is information corresponding to the cache mounted in the cache server 130.

As a result of the search, if there is information corresponding to the information request message, the information is transmitted to the sensor node 120, and if there is no information, the information providing server 140 requests information. Thereafter, the cache server 130 transmits the information received from the information providing server 140 to the user through the sensor node 120. In this case, the cache of the sensor node 120 and the cache in the cache server 130 are updated.

The sensor node 120 manages only information on a terminal capable of wireless communication, but the cache server 130 manages information on all terminals communicating with at least one sensor node 120, so that the cache node in the sensor node More memory is required.

The information providing server 140 is a server that manages cache servers, and records data in real time in real time or has additional detailed data that the cache server does not have. The information providing server 140 may be connected to the cache server 130 wirelessly through the Internet network or the base station. When the information providing server 140 receives the information request from the cache server, the information providing server 140 searches for information in its own database and transmits the information to the cache server 130.

Due to this hierarchical access method, the bottleneck caused by the terminal directly accessing the final information providing server can be greatly reduced and the radio resource utilization can be increased. In addition, the information providing server 140 transmits and receives information only between the cache servers 130, thereby improving efficiency in resource management. In addition, the amount of data transmission between the cache server 130 and the sensor node 120 is also reduced, thereby reducing the bottleneck in this section.

2 is a block diagram illustrating an internal configuration of a cache server as a preferred embodiment of the present invention.

The cache server of the present invention plays an intermediate communication role between the sensor node and the information providing server. The cache server includes a transceiver 210, a cache 220, and a searcher 230.

First, a sensor node first receives an information request message transmitted by a user through a terminal, and transmits an information request message to a cache server when there is no corresponding information in the sensor node.

The transceiver 210 receives an information request message from the sensor node, and receives data about information with high usage frequency from the information providing server.

The cache unit 220 stores data about frequently used information received from the information providing server, and, when a change in data occurs periodically or in the information providing server, the cache unit 220 stores data with the newly received frequently used information. The update is made by comparison.

The search unit 230 searches whether the cache unit 220 has information corresponding to the information request message. If present in the cache unit 220 transmits the information to the transceiver 210, the transceiver 210 transmits it to the sensor node.

If there is no information in the cache unit 220, the transceiver 210 transmits the information request message to the information providing server. Then, when the transceiver 210 receives the corresponding information, the cache unit 220 is updated, and transmits the received information to the sensor node. The cache unit 220 may efficiently use the limited computing resources by receiving new information from the information providing server and updating the existing information in a manner that replaces the less frequently used information.

The sensor node transmits the information received from the cache server to the terminal that sent the information request message. Since the information request message includes a keyword of necessary information that the user wants to find, the terminal distinguishes and displays only a portion of the received information that matches the keyword and displays the same to the user.

As already mentioned above, when the user needs more detailed information about the displayed information, the user requests the information providing server through the cache server through the sensor node.

3 illustrates an internal structure of a terminal as a preferred embodiment of the present invention. The terminal of the present invention includes a mobile phone, PDA, notebook, etc. capable of wireless communication. The terminal includes an input unit 310, a filtering unit 320, a transceiver 330, and a communication unit 340. The communication unit 340 of the terminal includes a component that performs the function of a sensor node or an RFID tag, so that communication and data collection with the outside is possible.

When a user inputs a keyword for searching for information required by the input unit 310, an information request message including the keyword is created and transmitted to the sensor node through the transceiver unit 330. After that, when the user receives the information requested by the sensor node through the above process, the filtering unit 320 displays only the information matching the keyword input by the user.

4 is a flowchart illustrating a method for transmitting and receiving information hierarchically between a user and an information providing server providing information requested by the user, according to an embodiment of the present invention.

The user inputs an information request message that he / she wants to find in the terminal (S410). Thereafter, based on the information read from the sensor node, it is determined whether the information matches the information requested by the user, and if it matches, the information is displayed on the user's terminal (S420 to S440).

After checking the displayed information, the user sends an information request message to the sensor node if more detailed information is needed. In the sensor node, if there is information corresponding to the first cache, it transmits to the terminal (S450, S460, S461).

If there is no corresponding information in the cache inside the sensor node, an information request message is sent to the cache server. The cache server searches for whether there is corresponding information in its cache (S471). If information exists in the cache server and transmits it to the sensor node (S473). If the information does not exist in the cache server, after connecting to the information providing server to receive the information, and updates the cache in the cache server, and transmits the received information to the sensor node (S472).

FIG. 5 illustrates an update process of a cache in a sensor node and a cache server according to an exemplary embodiment of the present invention.

The cache server receives update information related to data about information with high usage frequency from the information providing server (S510). In operation S520, it is determined whether the received update information and the data about the high frequency information already stored in the cache server match.

After the determination, if it is the same as the update information, the update is not performed. If not, the cache server is updated. Thereafter, this is transmitted to the corresponding sensor node to update the cache inside the sensor node (S530).

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). It also includes. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The best embodiments have been disclosed in the drawings and specification above. Although specific terms have been used herein, they 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 from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 illustrates a system for transmitting and receiving information hierarchically as a preferred embodiment of the present invention.

2 is a block diagram illustrating an internal configuration of a cache server as a preferred embodiment of the present invention.

3 illustrates an internal structure of a terminal as a preferred embodiment of the present invention.

4 is a flowchart illustrating a method for transmitting and receiving information hierarchically between a user and an information providing server providing information requested by the user, according to an embodiment of the present invention.

FIG. 5 illustrates an update process of a cache in a sensor node and a cache server according to an exemplary embodiment of the present invention.

Claims (19)

A system for transmitting and receiving information hierarchically between a terminal, a sensor node, a cache node, and an information providing server, When the user receives the information request message from the terminal, the sensor node for searching whether there is corresponding information in the first mounted cache and transmits the information request message if there is no; When the information request message is received from at least one sensor node, the controller searches for whether there is information in the second internally mounted cache, and if not, requests the information providing server to receive the information and transmits the information to the sensor node. And a cache server for updating the second cache. The capacity of the second cache is a hierarchical information transmitting and receiving system, characterized in that larger than the first cache. The method of claim 1, wherein the sensor node is If there is information corresponding to the information request message in the first cache, the corresponding information is transmitted to the terminal, And a corresponding information in the first cache, but additionally, when there is a detailed information request for the corresponding information from the terminal, transmitting the information request message to the cache server. The method of claim 1, wherein the cache server If there is information corresponding to the information request message in the second cache, update the first cache and transmit the information to the terminal through the sensor node, When receiving the information corresponding to the information request message by requesting the information providing server, the first cache and the second cache, characterized in that for updating the information to the terminal through the sensor node layer Information transmission and reception system. The method of claim 1, And the first cache stores information related to the information request message having a higher frequency of use in the sensor node than a predetermined reference, and is updated based on information received from the cache server. The method of claim 1, The second cache is a hierarchical information transmitting and receiving system, characterized in that for storing and updating data on the information associated with the information request message with a higher frequency of use than a predetermined reference in the information providing server. According to claim 1, The information request message includes a keyword of information required by a user, and the terminal filters and displays only information matching the keyword among the information received from the sensor node. The method of claim 1, The sensor node is installed within a range capable of wireless communication with the terminal and the cache server, wherein the cache server has information about a terminal with which at least one sensor node each communicates. In a system for transmitting and receiving information hierarchically between a terminal, a sensor node, a cache server, and an information providing server, the cache server for transmitting and receiving information hierarchically between the terminal and the information providing server includes: A transceiver for receiving an information request message of a user through a sensor node and transmitting information corresponding to the information request message; Stores data on information related to the information request message having a higher frequency of use than a predetermined criterion among data of the information providing server, and information related to the information request message having a higher frequency of use than a predetermined criterion at the information providing server. A cache unit that performs an update according to a change in data for the; and When the information request message is received, the cache information is searched for, and if there is information, the transmitter / receiver is transmitted. If there is no information corresponding to the cache, the request is made to the information providing server. Search unit for transmitting to the negative portion; cache server comprising a. The method of claim 8, wherein the user The cache server, characterized in that for receiving information corresponding to the information request message transmitted from the transceiver through the sensor node to the terminal. The method of claim 8, The information request message includes a keyword of information required by a user, and the terminal filters and displays only information matching the keyword among the information received from the sensor node. As a method for transmitting and receiving information hierarchically in a system for transmitting and receiving information hierarchically between a terminal, a sensor node, a cache node, and an information providing server. (a) when the user receives the information request message transmitted through the terminal from the sensor node, searching whether there is corresponding information in the first cache mounted in the sensor node and transmitting the information request message if there is no information; (b) retrieving whether there is information corresponding to a second cache mounted in the cache server when the cache server receives the information request message from at least one sensor node; (c) requesting the information providing server to receive the information and updating the second cache when there is no corresponding information in the searching step; and and (d) transmitting the information received from the information providing server to the sensor node, wherein the capacity of the second cache is larger than that of the first cache. 12. The method of claim 11, wherein the sensor node is If there is information corresponding to the information request message in the first cache, the corresponding information is transmitted to the terminal, When there is corresponding information in the first cache, but additionally, if there is a request for detailed information on the corresponding information from the terminal, the information request message is transmitted hierarchically to the cache server. Way. The method of claim 11, wherein the cache server If there is information corresponding to the information request message in the second cache, update the first cache and transmit the information to the terminal through the sensor node, When receiving the information corresponding to the information request message by requesting the information providing server, the first cache and the second cache, characterized in that for updating the information to the terminal through the sensor node layer How to send and receive information. The method of claim 11, The first cache stores information related to the information request message having a higher frequency of use than a predetermined criterion at the sensor node, and is updated hierarchically based on information received from the cache server. How to. The method of claim 11, And the second cache stores and updates data on information related to the information request message having a higher frequency of use than a predetermined criterion in the information providing server. The method of claim 11, wherein The information request message includes a keyword of information required by a user, and the terminal transmits / receives information hierarchically by displaying only the information matching the keyword among the information received from the sensor node. . The method of claim 11, The sensor node is installed within a range in which wireless communication with the terminal and the cache server is possible, and the cache server includes information about a terminal with which at least one sensor node communicates with each other hierarchically. How to send and receive. In a system for transmitting and receiving information hierarchically between a terminal, a sensor node, a cache server, and an information providing server, a method for transmitting and receiving information hierarchically through the cache server transmitting and receiving information hierarchically between the terminal and the information providing server. As Receiving an information request message of a user transmitted through a sensor node in the cache server; The cache server stores data on the information related to the information request message of which the frequency of use of the information providing server is higher than a predetermined criterion, and the information request message of which the frequency of use of the information providing server is higher than a predetermined criterion. Performing an update according to a change in data with respect to information associated with the; Retrieving whether there is information corresponding to the cache server when the cache server receives the information request message, and transmitting the information to the sensor node if there is information; And If there is no corresponding information as a result of the search, requesting the information providing server, receiving the information and transmitting it to the sensor node; hierarchically transmitting and receiving information comprising a. The method of claim 18, The information request message includes a keyword of information required by a user, and the terminal receives information received from the cache server by the sensor node, and displays only the information matching the keyword by filtering. How to send and receive information.

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