KR101742690B1 - Service Discovery Protocol Probing Apparatus and Method for Smart Device - Google Patents

Abstract

The present invention relates to an apparatus and method for determining a service discovery protocol of a smart device.
A service discovery protocol distinguishing device of a smart device according to the present invention includes a database for storing information related to a service discovery protocol (SDP), a message configuring unit for configuring a probing message, A message transmission / reception unit for receiving a return message corresponding to the probing message from the external device, and information for analyzing the return message received by the message transmission / reception unit, And an analyzer for comparing the service discovery protocol of the external device with the service discovery protocol of the external device.

Description

Technical Field [0001] The present invention relates to a service discovery protocol for a smart device,

The present invention relates to an apparatus and method for determining a service discovery protocol of a smart device.

Various smart devices have been developed and used according to the development of IoT (Internet of Things) technology.

As a result, interest in communication technology between smart devices is increasing.

In a new environment, various kinds of IoT devices (smart devices) performing communication with different kinds of protocols can coexist.

In this case, it may be necessary for smart devices to first know what kind of protocol they are using to communicate with each other.

In network communication, there is a service discovery protocol (SDP) for finding out what services are provided by smart devices (Korean Patent Application No. 10-2002-0075920, 10-2006-0124131)

However, there are heterogeneity problems in implementation in standardization interface such as Open Social, and there are the same incompatibility problems because various service detection protocols (UPnP, Jini, Bluetooth SDP) are developed together with many different standards.

The object of the present invention is to provide an apparatus and method for discriminating service discovery protocols of a smart device for mutual search between smart devices supporting heterogeneous SDPs so as to identify smart devices existing in the vicinity and support interaction with them have.

A method for determining a service discovery protocol of a smart device according to the present invention includes: detecting an external device; transmitting a first probing message to an external device detected in the detecting step; Receiving a first return message corresponding to the first probing message, comparing the first return message with information previously stored in a database, analyzing the first return message, Setting a first candidate range of a protocol (Service Discovery Protocol, SDP), if the detected probing protocol of the external device is not specified by the first probing message, Transmitting a second probing message from the detected external device; Receiving a second return message, comparing and analyzing the second return message with information previously stored in the database, and setting a second candidate range of the detected service discovery protocol of the external device . ≪ / RTI >

Also, the second candidate range may be set within the first candidate range.

Also, at least the first return message among the first return message and the second return message may be an error message.

At least one of the first probing message and the second probing message is a message for inquiring the type of a service discovery protocol of the detected external device, And a message querying the version of the service discovery protocol of the detected external device.

Also, the second probing message may be a message updated from the first probing message.

A service discovery protocol distinguishing device of a smart device according to the present invention includes a database for storing information related to a service discovery protocol (SDP), a message configuring unit for configuring a probing message, A message transmission / reception unit for receiving a return message corresponding to the probing message from the external device, and information for analyzing the return message received by the message transmission / reception unit, And an analyzer for comparing the service discovery protocol of the external device with the service discovery protocol of the external device.

The message composing unit configures a first probing message, the message transmitting and receiving unit transmits the first probing message to the external device, and the first probing message is transmitted from the external device to the first probing message, The analyzer compares the first return message with information previously stored in the database and analyzes the first return message to set a first candidate range of the service discovery protocol of the external device, Wherein the message composing unit configures a second probing message when the first probing message does not specify the service discovery protocol of the external device as the first probing message and the message transmitting and receiving unit transmits the second probing message From the external device, a second probe message corresponding to the second probing message The analyzer may compare the second return message with the information previously stored in the database and analyze the second return message to set a second candidate range of the service discovery protocol of the external device .

Also, the second candidate range may be set within the first candidate range.

Also, at least the first return message among the first return message and the second return message may be an error message.

At least one of the first probing message and the second probing message is a message for inquiring the type of a service discovery protocol of the external device, And a message querying the version of the service discovery protocol of the mobile terminal.

Also, the second probing message may be a message updated from the first probing message.

The apparatus and method for determining a service discovery protocol of a smart device according to the present invention can perform communication with surrounding smart devices more quickly and effectively.

1 to 3 are views for explaining a service discovery protocol distinguishing device of a smart device according to the present invention.
4 to 6 are diagrams for explaining a service discovery protocol determination method of a smart device.
7 to 10 are diagrams for explaining an example of a service discovery protocol discrimination method of a smart device.
11 is a view for explaining an example of a pseudo code of an algorithm for implementing a service search protocol discrimination method according to the present invention.
FIG. 12 is a diagram illustrating a configuration of a next probing message according to a current state with a millimeter.
13 is a diagram for explaining an example of a decision model corresponding to each state.

Hereinafter, an apparatus and method for determining a service discovery protocol of a smart device according to the present invention will be described in detail with reference to the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives falling within the spirit and scope of the present invention.

In describing the present invention, the terms first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms may only be used for the purpose of distinguishing one element from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The term " and / or " may include any combination of a plurality of related listed items or any of a plurality of related listed items.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between Can be understood. On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it can be understood that no other element exists in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions may include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used interchangeably to designate one or more of the features, numbers, steps, operations, elements, components, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries can be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are, unless expressly defined in the present application, interpreted in an ideal or overly formal sense .

In addition, the following embodiments are provided to explain more fully to the average person skilled in the art. The shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

The various embodiments described below may be implemented in a recording medium readable by a computer or similar device using software, hardware, or a combination thereof.

In accordance with a hardware implementation, embodiments of the present invention may be implemented in a processor, such as application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays may be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing functions.

On the other hand, according to a software implementation, embodiments such as procedures or functions in the present invention may be implemented with separate software modules that perform at least one function or operation.

Hereinafter, 'A and / or B' can be interpreted as 'at least one of A and B.'

The external device described below may be an IoT device, which means a computing device capable of computing on its own and making decisions on its own.

1 to 3 are views for explaining a service discovery protocol distinguishing device of a smart device according to the present invention.

Here, the smart device 10 according to the present invention will be described by taking a mobile communication terminal such as a smart phone as an example, but the present invention is not limited thereto. For example, the smart device 10 according to the present invention may be a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation system, or the like.

1, a smart device 10 according to the present invention includes a discriminator 100, a communication unit 120, a memory unit 130, a user input unit 140, a display unit 150, a voice output unit 160, And may include a control unit 170. 1 are not essential, it is also possible to implement a smart device 10 having more or fewer components than those shown in FIG.

The determination device 100 can search for and detect nearby external devices.

In addition, the determination apparatus 100 may generate a predetermined probing message and determine the service discovery protocol (SDP) of the external device detected using the generated probing message.

The discriminating apparatus 100 will be described in more detail below.

The communication unit 120 may include at least one communication module for wireless communication with an external device or the like. For example, the communication unit 120 may include at least one of a mobile communication module, a wireless Internet module, and a local communication module.

The mobile communication module can transmit and receive a radio signal to and from a base station and an external device (another mobile communication terminal, etc.) on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module may refer to a module for wireless Internet access. Wireless Internet technologies include Long Term Evolution (LTE), Wideband Code Division Multiple Access (W-CDMA), Wireless LAN (WiFi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access) Speed Downlink Packet Access) may be used.

The wireless Internet module may retrieve information corresponding to the service discovery protocol (SDP) from the outside and receive information corresponding to the retrieved service discovery protocol.

The short-range communication module may mean a module for short-range communication. Bluetooth, radio frequency identification (RFID), infrared data association (IrDA), ultra wideband (UWB), ZigBee, and the like can be used as the short distance communication technology.

The short-range communication module can perform communication with an external device using short-range communication.

The user input unit 140 may generate input data for controlling the operation of the smart device 10 by a user. The user input unit 140 may include a keypad, a dome switch, a touch pad (static / static), a jog wheel, and / or a jog switch.

The display unit 150 can output information processed in the smart device 10 on the screen. For example, the display unit 150 may display information indicating the detection of the external device on the screen, or may display information on the service discovery protocol (SDP) of the external device that has determined it on the screen.

The voice output unit 160 outputs an acoustic signal related to a function performed in the smart device 10. For example, the audio output unit 160 may output audio data received in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, or the like, or may output audio data stored in the memory unit 130. The audio output unit 160 may include a speaker, a buzzer, and the like.

Although not shown, the smart device 10 according to the present invention may further include a haptic module capable of generating various tactile effects that the user can feel. Such a haptic module can generate vibration, for example.

The memory 130 may store a program for the operation of the controller 170 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.).

In addition, the memory 130 may store information on a type of a service discovery protocol (SDP), information on a probing message and a return message.

The interface unit 110 may serve as a path for communication with all external devices connected to the smart device 10. The interface unit 110 receives data from an external device or receives power from the external device to transfer the data to each component in the smart device 10 or to transmit data in the smart device 10 to an external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 110.

The control unit 170 can control the overall operation of the smart device 10. [ For example, perform related controls and processing for voice calls, data communications, video calls, and the like.

The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

It may be possible for at least one other part to be added to the smart device 10 described above. For example, the smart device 10 may further include an A / V (Audio / Video) input unit such as a camera or a microphone for inputting an audio signal or a video signal.

The smart device 10 can detect various external devices and perform communication with the detected external devices. 2, the smart device 10 according to the present invention includes an external device 20 such as a refrigerator 20a, a door 20b, a washing machine 20c, and a car 20d. And can perform communication with the external devices 20.

Here, the external devices 20 may be IoT devices capable of communicating with the smart device 10.

The discriminating apparatus 100 for detecting at least one external apparatus 20 and determining the service discovery protocol (SDP) of the detected external apparatus 20 will be described in more detail with reference to FIG. 3 attached hereto .

3 are not essential, it is also possible to implement the discriminating apparatus 100 having more or fewer components than those shown in Fig.

3, the discriminator 100 according to the present invention includes a database, a SDP Knowledge Base (KB) 101, a Probe Message Composer 102 and a Probe Message Transceiver 103, , And an analysis unit (SDP Analyzer) 104. In addition, the determination apparatus 100 according to the present invention may further include a search unit (SDP KB Utility) 105.

The database 101 may store information related to the service discovery protocol (SDP). For example, the database 101 may store information about the probing message and the return message, and may store information about the interpretation of the return message corresponding to the probing message.

In addition, the database 101 may store information on how to create a probe message, information on a procedure for creating a probe message, and the like.

The message configuration unit 102 may configure a probing message to be transmitted to the external device 20. [

The message transmitting / receiving unit 103 may transmit the probing message to the external device 20 and receive the return message corresponding to the probing message from the external device 20. [

The analysis unit 104 may determine the service search protocol of the external device 20 by comparing the analyzed information of the return message received by the message transmission / reception unit 103 with information stored in the database 101. For example, the analyzer 104 can determine which probe message to send to the external device 20, what the return message corresponding to the probe message has, and what response should be displayed in response to the return message have.

The searching unit 105 can search the database 101 under the control of the analyzing unit 104. [

Hereinafter, a method for determining a service discovery protocol of a smart device using the discriminator 100 will be described with reference to the accompanying drawings.

4 to 6 are diagrams for explaining a service discovery protocol determination method of a smart device. In the following, description of the parts described above may be omitted.

Referring to FIG. 4, the smart device 10 according to the present invention can detect the external device 20 (S100).

Thereafter, the smart device 10 can confirm (discriminate) the detected service discovery protocol (SDP) of the external device 20 (S200).

Thereafter, communication with the external device 20 that has determined the service discovery protocol (SDP) can be performed (S300).

A method for determining the service discovery protocol (SDP) of the detected external device 20 will now be described in more detail.

5, after the step of detecting the external device 20 (S100), the message composing unit 102 creates a first probing message (PM1) (S201), and the message transmission / reception unit 103 May transmit the created first probing message PM1 to the detected external device 20 (S202).

Then, the external device 20 can transmit a first return message (RM1) to the smart device 10 according to the present invention in response to the first probing message PM1. Then, the message transmitting / receiving unit 103 of the discriminating apparatus 100 according to the present invention can receive it (S203).

If the external device 20 does not understand the first probing message PM1 or does not receive the first probing message PM1 and the external device 20 can not transmit a predetermined return message RM to the smart device 10 May also occur. This will be described below, assuming that the external device 20 transmits a predetermined return message RM to the smart device 10.

The analysis unit 104 may compare information about the first return message RM1 received by the message transmission / reception unit 103 with information stored in the database 101 through the search unit 105 S204).

Then, the analyzer 104 may set the first candidate range of the service discovery protocol (SDP) of the external device 20 according to the result of analyzing the first return message RM1 (S205).

Thereafter, it can be determined whether or not the service discovery protocol (SDP) of the external device 20 can be specified as the first candidate range set (S206).

As a result of the determination, if the service discovery protocol (SDP) of the external device 20 can be specified only by the first return message RM1, that is, the service discovery protocol (SDP) of the external device 20 as the first candidate range If it can be specified, data transmission / reception can be performed by applying a specific service discovery protocol (SDP) (S207).

On the other hand, if it is determined in step S206 that the service discovery protocol (SDP) of the external device 20 can not be specified as the first candidate range, whether the service discovery protocol (SDP) of the external device 20 can be discriminated (S208).

As a result of the determination, if the service discovery protocol (SDP) of the external device 20 can not be determined, another predetermined function (Default) can be performed.

For example, it may be impossible to discriminate when the number of transmission times of the probing message exceeds a predetermined reference number.

Or can not be discriminated when the return message RM received from the external device 20 can not be interpreted.

Alternatively, it can not be discriminated when the return message RM is not received from the external device 20 any more.

As described above, it is also possible to display information on the screen that can not be discriminated in the case where it can not be discriminated, or to retrieve information about the service retrieval protocol (SDP) from the outside and to download the retrieval unit 105 from the outside. The function performed in the case where it can not be determined is not limited to this.

On the other hand, if the service discovery protocol (SDP) of the external device 20 is not discriminable, the message configuration unit 102 transmits a second probing message (PM2) different from the first probing message PM1 (S210), and the message transmission / reception unit 103 can transmit the generated second probing message PM2 to the detected external device 20 (S211). Here, the second probing message PM2 may be a message updated from the first probing message PM1. In other words, it may be desirable that the second probing message PM2 is a more specific message than the first probing message PMl.

The external device 20 can transmit a second return message (RM2) to the smart device 10 according to the present invention in response to the second probing message PM2. Then, the message transmission / reception unit 103 of the determination apparatus 100 according to the present invention can receive the second return message RM2 (S212).

Here, at least the first return message RM1 among the first return message RM1 and the second return message RM2 may be an error message. In other words, when the service discovery protocol (SDP) of the external device 20 can be specified only by the first return message RM1, the first return message RM1 may not be an error message, 103 may receive up to the second return message RM2, it may be possible that the first return message RM1 is an error message.

If the external device 20 does not understand or receive the second probing message PM2 or the like, the external device 20 can not transmit the predetermined return message RM to the smart device 10 May also occur.

The analysis unit 104 may compare information about the second return message RM2 received by the message transmission / reception unit 103 with information stored in the database 101 through the search unit 105 S213).

Thereafter, the analyzer 104 may set the second candidate range of the service discovery protocol (SDP) of the external device 20 according to the result of analyzing the second return message RM2 (S214). Here, the second candidate range may be set within the first candidate range.

For example, as in the case of FIG. 6, if the first candidate range of the service discovery protocol (SDP) set from the first probing message PM1 is the first area A1, The second candidate range of the search protocol (SDP) may be the second area A2 included in the first area A1. In this way, a third region A3 of the third code range and a fourth region A4 of the fourth candidate range can be set.

Thereafter, it is possible to determine whether or not the service discovery protocol (SDP) of the external device 20 can be specified as the set second candidate range (S206).

This process can be repeated until the service discovery protocol (SDP) of the external device 20 is determined.

In other words, when the analyzing unit 104 is ambiguous to grasp the type of the service discovery protocol (SDP) of the external device 20, that is, does not clearly grasp the type of the service discovery protocol (SDP) of the external device 20 The message composing unit 102 can generate the next probing message based on the information about the model of the service discovery protocol (SDP) roughly grasped to date.

For example, when the analyzing unit 104 can clearly determine the type of the service discovery protocol (SDP) of the external device 20 as the first probing message PM1, the second probing message PM2 is Or a message querying the version of the service discovery protocol (SDP) of the external device 20.

On the other hand, when the analyzing unit 104 can clearly identify the type of the service discovery protocol (SDP) of the external device 20 as the first probing message PM1, It is possible to roughly predict the model of the service discovery protocol (SDP) of the external device 20 based on the information obtained from the message PM1. The analyzing unit 104 then controls the message composing unit 102 to form the second probing message PM2 to further refine the type of the service discovery protocol (SDP) of the external device 20 as the predicted information can do.

This process can be repeated until the discrimination apparatus 100 finally discriminates the type and version of the service discovery protocol (SDP) of the external device 20 or fails to discriminate.

As described above, at least one of the first probing message PM1 and the second probing message PM2 may be a message inquiring the type of the service discovery protocol (SDP) of the detected external device 20.

Alternatively, at least one of the first probing message PM1 and the second probing message PM2 may be a message inquiring the version of the service discovery protocol (SDP) of the detected external device 20.

For example, the determination apparatus 100 according to the present invention transmits the first probing message PM1 to the detected external device 20, and inquires the type of the service discovery protocol (SDP) of the external device 20 . In this case, the determination apparatus 100 may determine the type of the service discovery protocol (SDP) by interpreting the received first return message RM1 corresponding to the first probing message PM1.

The discriminating apparatus 100 according to the present invention can also transmit the second probing message PM2 to the detected external device 20 to query the version of the service discovery protocol (SDP) of the external device 20 . In this case, the determination apparatus 100 may determine the version of the service discovery protocol (SDP) by interpreting the received second return message RM2 corresponding to the first probing message PM2.

The above-mentioned contents will be described from a different viewpoint as follows.

The analyzing unit 104 of the discriminating apparatus 100 controls the message transmitting and receiving unit 103 to transmit the discriminated result to the external device 20 To transmit several packets as a probing message. In this way, the analysis unit 104 of the determination apparatus 100 can check whether the port designated to the external device 20 is open or the service port being used.

The analyzing unit 104 of the discriminating apparatus 100 analyzes an answer transmitted from the external device 20, that is, a return message RM to specify an abstract service discovery protocol (SDP) model of the external device 20 .

Based on the result of analyzing the return message RM, the analyzer 104 determines whether the type or version of the service discovery protocol (SDP) used by the external device 20 is a database 101). ≪ / RTI >

Then, the retrieving unit 105 can check whether the information corresponding to the result of analyzing the return message RM exists in the database 101, and transmit the confirmed result to the analyzing unit 104 (reply).

If the service discovery protocol (SDP) of the external device 20 detected by the analyzer 104 is discriminated, the type and name of the service discovery protocol (SDP) can be returned. In this way, it is possible to determine the service discovery protocol (SDP) of the external device 20 detected using the probing message.

In this case, even when the external device 20 uses a heterogeneous service discovery protocol (SDP), it is possible to more quickly determine the service discovery protocol (SDP) of the external device 20.

If it is difficult to determine the service discovery protocol (SDP) of the external device 20 based solely on the information stored in the database 101, the determination device 100 may reach a state where the probe message can not be constructed any more. In this case, it is possible to proceed to another function (step S209 of FIG.

For example, the above case can be called 'PROB_FAIL'. In such a case, it is recommended to update the database 101 to the user or the administrator, and information about the update may be output.

7 to 10 are diagrams for explaining an example of a service discovery protocol discrimination method of a smart device. In the following, description of the parts described above may be omitted.

For convenience of description, it is assumed that a total of 12 service discovery protocols (SDPs) exist as shown in FIG.

For example, in 'A-16-v2' which is one of the service discovery protocol (SDP), 'A' denotes the type of the service discovery protocol (SDP), '16' , And 'v2' may mean the version of the service discovery protocol (SDP).

FIG. 7 is merely an example for explaining the service discovery protocol (SDP), and the present invention is not limited thereto.

The database 101 of the discriminating apparatus 100 according to the present invention stores information on twelve service discovery protocols (SDP), information on probing messages (PM) , Information on a return message (RM), information on a return message, and the like can be stored.

8, a total of four service discovery protocols (SDP) 'A-16-v2', 'A-16-v1', 'A- Message A 'is transmitted to the external device 20 using the service type (Type A service discovery protocol), the external device 20 can return a return message RM of' Welcome '.

In addition, an external device (hereinafter, referred to as " A-16-v2 ") using four service detection protocols The external device 20 returns a return message RM of 'Error a1' and transmits a probe message of 'Message C' to the external device 20 20), a return message (RM) 'Error a2' can be returned.

B-16-v2 ',' C-16-v1 ',' B-8-v2 ' Since the external device 20 using the eight service discovery protocols (SDP), i.e., '-8-v2' and 'C-8-v1', can be sufficiently inferred based on the above- It will be omitted.

9, a total of four service discovery protocols (SDP) 'C-16-v2', 'C-16-v1', 'C- (C-16-v2) and C-16-v1 among the service discovery protocol (C type service discovery protocol) Protocol, the external device 20 can return a return message RM of 'Welcome' when the probe message of 'Message C16' is transmitted to the external device 20 using the protocol.

In addition, a total of four service discovery protocols (SDP) (C type service discovery, C-16-v2, C-16-v1, C-8- (Service discovery protocol corresponding to 16 bits of the service discovery protocol of the C type) of the two service discovery protocols (SDP) of 'C-16-v2' and 'C- When the probe message of 'Message C8' is transmitted to the device 20, the external device 20 can return a return message RM of 'Error 16'.

The external device 20 using the two service discovery protocols (SDP) 'C-8-v2' and 'C-8-v1' can be sufficiently inferred based on the above- A description thereof will be omitted.

10, a total of two service discovery protocols (SDP) of 'C-16-v2' and 'C-16-v1' ) Which uses the service discovery protocol (SDP) of the 'C-16-v2' (service discovery protocol corresponding to the second version of the service discovery protocol corresponding to 16 bits of the service discovery protocol of the C type) , The external device 20 can return a return message RM of 'Welcome'.

Among the two service discovery protocols (SDP) (service discovery protocol corresponding to 16 bits among service discovery protocols of C type), 'C-16-v2' and 'C- message C16v1 'to the external device 20 using the service discovery protocol (SDP) of the' -v2 'service discovery protocol (service discovery protocol corresponding to the second version of the service discovery protocol corresponding to 16 bits of the service discovery protocol of C type) The external device 20 can return a return message RM of 'Error v2'.

The external device 20 using the service discovery protocol (SDP) of 'C-16-v1' can be sufficiently inferred based on the above-described contents, and a duplicate description will be omitted.

In this situation, it is assumed that the external device 20 using the service discovery protocol of 'C-16-v1' accesses the other smart device 10 according to the present invention.

In this case, the determination device 100 according to the present invention can detect the accessed external device 20 and transmit 'Message A' to the detected external device 20 with the probe message PM.

Then, the external device 20 returns 'Error C1' to the return message RM, and the discriminating apparatus 100 can receive it. In this case, the determination apparatus 100 may analyze 'Error C1', which is the return message RM, to confirm that the detected external device 20 uses the C type service discovery protocol.

Thereafter, the determination device 20 may transmit 'Message C8' as a probing message (PM) to the detected external device 20 corresponding to the C type service discovery protocol.

Then, the external device 20 returns 'Error 8' to the return message RM, and the discriminating apparatus 100 can receive it. In this case, the discriminator 100 can confirm that the external device 20 detected by analyzing 'Error 8' which is the return message RM is of the C type and uses the service discovery protocol corresponding to 16 bits.

Thereafter, the determining device 20 can transmit 'Message C16v2' as a probing message (PM) to the external device 20 detected in correspondence with the service discovery protocol corresponding to 16 bits.

Then, the external device 20 returns 'Error v1' to the return message RM, and the discriminating apparatus 100 can receive it. In this case, the discriminator 100 determines that the external device 20, which is detected by analyzing the 'Error v1' which is the return message RM, is of the C type and corresponds to 16 bits and the first version of the service discovery protocol, 16-v1 'is used.

7 to 10 are assumed to facilitate understanding of the present invention, and the present invention is not limited thereto.

11 is a view for explaining an example of a pseudo code of an algorithm for implementing a service search protocol discrimination method according to the present invention. FIG. 12 is a diagram illustrating a configuration of a next probing message according to a current state with a millimeter. 13 is a diagram for explaining an example of a decision model corresponding to each state. In the following, the description of the parts described above may be omitted.

Referring to FIG. 11, the algorithm for implementing the service discovery protocol determination method according to the present invention may include three parts: detectSDP, updateProbingState, and getProbeResult.

The analyzing unit 104 of the discriminating apparatus 100 can call detectSDP to grasp the service discovery protocol (SDP) of the detected external device 20. [

The simplest netcat message can be constructed by filling the service discovery protocol (SDP) model of the external device 20 with bean attributes before repeating the transmission of the probe message and the reception of the return message. In addition, probing messaging can be performed by transmitting the composed message.

In the process of performing the probing messaging, the analyzer 104 may update the current target service discovery protocol (SDP) model by analyzing the received message.

The next step is to verify that the Target Service Discovery Protocol (SDP) can be grasped by checking the current Target Service Discovery Protocol (SDP) model.

If the target service discovery protocol (SDP) can not be confirmed, the analysis unit 104 can continue the process by requesting the search unit 105 for a new probing message.

For example, if details of the service discovery protocol (SDP) and port of the target external device 20, i.e., the detected external device 20, are stored in the database 101, It may be possible to include protocol (SDP) related content.

It is also possible to determine whether the target external device 20 uses the same version with the return message RM returned from the target external device 20. [

The following probing message is mapped to the 'getProbeSpec' procedure which can be called from the 'detectSDP' procedure.

FIG. 12 shows the following probing message decision model according to the current state as a millimeter.

In the decision model, each circle represents a state in which the target external device 20 can exist.

The line connecting each circle contains input and output.

In the decision model, the input means the next probe message, and the output may refer to a return message coming from the target external device 20.

Output values can represent multiple conditions, which may be possible to be represented by the logical operator AND (&) or OR (|).

The following probe messages can define two message classes: port_scan and sdp_msg .

The first class, port_scan, is similar to the UNIX NetCat command, which can be used to do port scanning and determine which services are using that port.

If a service is running on the corresponding port, the target external device 20 can return a response using the corresponding service signature (e.g., UDP / SSDP) in the base protocol.

If the service is not known, the signature may be denoted by a wildcard *.

If the next probing message is port_scan then the port scanning message can be sent to the allowed range in ascending or descending order.

The second class, sdp_msg , can be a kind of protocol message. For example, in SLPv2, you can configure sdp_msg with SrvRqst, SrvRply, SrvReg, and so on.

The Sdp_msg is determined and the user equipment, i.e., the smart device 10, can change and transmit the character encoding of the modified probe message PM (e.g. SrvReg at SrvRqst).

How to modify sdp_msg in the database 101 is known and can be modified by the protocol engineer.

After repeatedly terminating the probing process, the results can be successful or fail.

Upon reaching the success status, the smart device 10 grasps the type (version) and version of the service discovery protocol (SDP) of the target external device 20. The protocol details may therefore be loaded in the database 101 or may be requested from the Global Service Discovery Protocol (SDP) repository.

On the other hand, reaching a failure state can mean three scenarios.

The first scenario might be when the Service Discovery Protocol (SDP) is set but it does not know the version.

This case can be true if the state transition comes from SDP_ERROR or SDP_NO_REPLY.

Since we know the type of service discovery protocol (SDP), we can proceed with SDP update.

In the second case, it is possible to execute the service discovery protocol (SDP), but it can be dealt with when the type is not specified.

This case can be corresponded to when the state transition comes from NO_REPLY or UNKNOWN_SIG.

Based on the results obtained through probing so far, the service discovery protocol (SDP) can be grasped through the Internet.

In the third case, the service discovery protocol (SDP) is not executed in the target external device 20. In this case, the target external device 20 may be referred to as a dummy host. This case may correspond to a case where the state transition comes from NO_SDP.

Referring to FIG. 13, the state of the probing message decision model will be understood.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

It should be understood, therefore, that the embodiments described above are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, And all changes or modifications derived from equivalents thereof should be construed as being included within the scope of the present invention.

Claims (11)

A detecting step of detecting an external device;
Transmitting a first probing message to an external device detected in the detecting step;
Receiving a first return message corresponding to the first probing message from the detected external device;
Comparing the first return message with information previously stored in a database and analyzing the first return message to set a first candidate range of a service discovery protocol (SDP) of the detected external device;
Transmitting a second probing message to the detected external device if the first probing message fails to specify the detected service discovery protocol of the external device;
Receiving a second return message corresponding to the second probing message from the detected external device;
Comparing the second return message with information previously stored in the database and analyzing the second return message to set a second candidate range of the detected service discovery protocol of the external device;
The method comprising the steps of: The method according to claim 1,
Wherein the second candidate range is set within the first candidate range. The method according to claim 1,
Wherein at least one of the first return message and the second return message is an error message. The method according to claim 1,
At least one of the first probing message and the second probing message is a message for inquiring the type of a service discovery protocol of the detected external device,
Wherein at least one of the first probing message and the second probing message is a message querying a version of a service discovery protocol of the detected external device. The method according to claim 1,
Wherein the second probing message is a message updated from the first probing message. A database for storing information related to a service discovery protocol (SDP);
A message constructing a probing message;
A message transmission / reception unit transmitting the probe message to an external device and receiving a return message corresponding to the probe message from the external device; And
An analysis unit for comparing the analyzed information of the return message received by the message transmission / reception unit with information stored in the database to determine a service discovery protocol of the external device;
/ RTI >
The message composing unit configures a first probing message,
The message transmission / reception unit transmits the first probing message to the external device, receives a first return message corresponding to the first probing message from the external device,
Wherein the analyzer compares the first return message with information previously stored in the database and analyzes the first return message to set a first candidate range of the service discovery protocol of the external device,
If the analysis unit fails to specify the service discovery protocol of the external device in the first probing message, the message configuring unit configures a second probing message,
The message transmitting and receiving unit transmits the second probing message to the external device, receives a second return message corresponding to the second probing message from the external device,
Wherein the analyzer compares the second return message with information previously stored in the database and analyzes the second return message to set a second candidate range of the service discovery protocol of the external device. delete The method according to claim 6,
And the second candidate range is set within the first candidate range. The method according to claim 6,
Wherein at least one of the first return message and the second return message is an error message. The method according to claim 6,
At least one of the first probing message and the second probing message is a message for inquiring the type of a service discovery protocol of the external device,
Wherein at least one of the first probing message and the second probing message is a message inquiring a version of a service discovery protocol of the external device. The method according to claim 6,
Wherein the second probing message is an updated message from the first probing message.

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