KR101801061B1 - Service Discovery System based on P2P in Underwater IoT Device and the Underwater IoT Device thereof - Google Patents

Abstract

The present invention relates to a P2P-based service discovery method in an underwater IoT device, and the underwater IoT device to search and access various application services provided on different kinds of networks on the basis of P2P in an IoT communication device. The underwater IoT device using the P2P-based service discovery method according to the present invention comprises: an underwater IoT protocol unit which performs communication with a ground IoT device or another underwater IoT device by using ground or underground communication protocol; a service discovery function nit which communicates with the underwater IoT protocol unit, forms a P2P overlay network for performing service discovery, performs service searching in response to a service searching request, and provides a service searching result; and an intersection layer interface unit which processes an interface for communication between the underwater IoT protocol unit and the service discovery function unit.

Description

[0001] The present invention relates to a P2P-based service discovery method in an underwater object Internet device, and to an underwater IoT device having the P2P in-

The present invention relates to a P2P (Peer-to-Peer) -based service discovery method and an Internet of Things (IoT) device therefor. More particularly, the present invention relates to a P2P A service discovery method based on P2P in an underwater object internet device, and an underwater object internet device in which various services to be provided can be searched and accessed.

Objects for Underwater or Ground Internet (IoT) Operation The Internet communication terminal can provide various application services based on sensing data collected through various sensors. It is also possible to provide a mashup service through fusion of various application services.

In order to provide such a fusion service, it is essential to have a service discovery function for searching whether a service provided by the object Internet communication terminal is provided and a specific service is currently provided in various heterogeneous network environments do.

OneM2M, an international standardization organization that plays a leading role in relation to current ground-based Machine to Machine (M2M) and Internet (IoT), is based on existing DNS to satisfy the service discovery requirements. Although one method is considered, the interoperability with the underwater objects internet is not discussed as standardization object.

Especially, unlike the ground, it is not easy to access the central server in the constrained environment such as the underwater environment, so there is a limit to apply to the underwater object communication.

Patent Registration No. 10-1611988 Patent Registration No. 10-0661856 Japanese Patent Application Laid-Open No. 10-2015-0116045

Accordingly, it is an object of the present invention to provide an underwater object Internet device capable of searching for and accessing various application services provided on heterogeneous networks based on P2P in a terminal operating in the Internet (IoT) and providing a mashup service through the search P2P-based service discovery method and object Internet apparatus of the present invention.

In addition, when forming a lightweight P2P overlay network in an underwater communication terminal in consideration of the limitation of an underwater environment, the present invention provides a method of piggybacking packets in an underwater communication protocol of a data link or a network layer through an intersection layer, A P2P-based service discovery method in an underwater object Internet device that reduces a traffic load due to a P2P protocol, and another object is to provide an object Internet device.

A P2P-based service discovery method according to an embodiment of the present invention is a method for providing a P2P-based service discovery method in an Internet underwater object Internet device performing a service discovery function with a terrestrial object Internet device, wherein the service discovery function unit requests P2P overlay network information for service discovery To an object internet protocol unit; The underwater object internet protocol unit updates the underwater object Internet network topology to which the underwater object Internet apparatus belongs according to the request of the P2P overlay network information and performs the piggyback processing of the P2P overlay network information at the time of the update Starting; Requesting, by the underwater object internet protocol unit, the local P2P overlay network information to be piggybacked in an extension header of a packet for updating the topology, when the update to the topology is performed, from the service discovery function unit; Retrieving local P2P overlay network information according to the request from the service discovery function unit and transmitting the local P2P overlay network information in response to the underwater object internet protocol unit; Wherein the underwater object internet protocol unit piggybacks the received local P2P overlay network information in an extension header of a packet for updating the underwater object Internet network topology and completes updating of the underwater object internet network topology, A step of completing a piggyback process of the step Receiving, by the service discovery function unit, the response of the P2P overlay network information from the underwater object internet protocol unit and completing the formation of the P2P overlay network; And when the service discovery function unit receives a service search request from another object Internet apparatus, performing a service search according to the service search request and transmitting the result of the service search to the other object Internet apparatus.

In the present invention, the underwater object internet protocol unit and the service discovery function unit communicate with each other through a cross layer interface unit, and the cross layer interface unit includes a physical layer, a data link layer, a network layer and a transport layer of the underwater object internet protocol unit, Service discovery function.

In the present invention, the piggyback may include piggybacking a packet of an underwater communication protocol generated at the time of updating the underwater object Internet network topology at the data link layer, the network layer, or the transport layer of the underwater object Internet protocol unit through the cross- do.

In the present invention, the extension header for the P2P-based service discovery is applied to the header of the underwater communication protocol of the underwater object internet protocol unit.

In the present invention, the service discovery function unit communicates with a plurality of sensor units through a predetermined sensor interface, transmits commands to the plurality of sensor units, receives sensing data, and transmits the service discovery information as information for forming the P2P overlay network Function unit and the underwater object internet protocol unit, respectively.

In addition, the underwater object Internet apparatus to which the P2P-based service discovery method according to the present invention is applied includes an underwater object internet protocol unit for communicating with a ground object Internet apparatus or another underwater object Internet apparatus using a ground or underwater communication protocol; A service discovery function unit communicating with the underwater object internet protocol unit and forming a P2P overlay network for performing service discovery, performing a service search according to a service search request and responding to a service search result; And a cross-layer interface unit for processing an interface for communication between the underwater object internet protocol unit and the service discovery function unit.

In the present invention, the cross layer interface unit handles communication between the physical layer, the data link layer, the network layer, and the transport layer of the underwater object Internet protocol unit and the service discovery function unit.

In the present invention, the service discovery function unit communicates with a plurality of sensor units through a predetermined sensor interface unit, transmits commands to the plurality of sensor units, receives sensing data, and generates information for forming a P2P overlay network, To the underwater object internet protocol unit.

In the present invention, the service discovery function unit collects sensing information for forming a P2P-based overlay network through the sensor interface unit and transmits the sensing information to the underwater object Internet protocol unit to form a P2P-based overlay network through the cross- A P2P overlay network information requesting unit for requesting P2P overlay network information from the underwater object Internet protocol unit and for searching the local P2P overlay network information according to a local P2P overlay network information request from the underwater object internet protocol unit, A P2P overlay network manager for completing formation of a P2P overlay network when a response to the network information is received; A message for a P2P overlay network information request to be transmitted to the underwater object internet protocol unit and a message for a local P2P overlay network information response and a message for a local P2P overlay network information request and a P2P overlay network information response received from the underwater object internet protocol unit A message processor for analyzing the message; A query unit for performing a query for a service discovery request and a query for an instruction to a sensor unit through the intersection layer interface unit and the sensor interface unit; An overlay network information management unit for processing and managing the received overlay network information; An overlay network information storage unit for storing overlay network information analyzed and processed by the overlay network information management unit; And a service discovery management unit for controlling the overall operation of the service discovery function unit and performing a procedure for forming a P2P overlay network in the underwater object Internet device.

In the present invention, when the P2P overlay network information request is received from the P2P overlay network management unit, the underwater object internet protocol unit updates an underwater object Internet network topology to which the underwater object Internet apparatus belongs, Wherein the P2P overlay network information management apparatus comprises: a P2P overlay network management unit for managing the P2P overlay network information; a P2P overlay network management unit for performing a piggyback processing of the P2P overlay network information when the update is performed; The piggyback processing of the P2P overlay network information is completed by piggybacking on the extension header of the packet for updating the underwater object internet network topology and completing the update of the underwater object internet network topology .

In the present invention, the piggyback may include piggybacking a packet of an underwater communication protocol generated at the time of updating the underwater object Internet network topology at the data link layer, the network layer, or the transport layer of the underwater object Internet protocol unit through the cross- do.

In the present invention, an extension header including P2P overlay network information is applied to the header of the underwater communication protocol of the underwater object internet protocol unit for the P2P-based service discovery.

According to the present invention, it is difficult to apply the service discovery system discussed in the Internet (IoT) on the Internet to underwater objects. To solve this problem, a P2P-based service By providing a discovery system, it is possible to implement service discovery for the underwater object Internet even under the constraint of the underwater environment.

In addition, according to the present invention, interoperability between Internet devices on the ground and underwater is ensured by linking with the service discovery of the ground object Internet, thereby enabling horizontal integration among different kinds of networks.

1 is an exemplary diagram of a heterogeneous object Internet network to which the present invention is applied.
2 is an illustration of an underwater object Internet network topology according to the present invention.
FIG. 3 is a block diagram of a configuration of an object Internet device for P2P-based service discovery according to an embodiment of the present invention.
4 is a flowchart illustrating a P2P-based service discovery method according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

1 is an exemplary diagram of a heterogeneous object Internet network to which the present invention is applied.

FIG. 1 shows a heterogeneous object Internet network to which a P2P-based service discovery method according to the present invention is applied. For example, the object-to-object Internet network 110 and the underwater object internet network 120 are interconnected and operated. The ground object Internet network 110 and the underwater object internet network 120 communicate with the object Internet service provider or the user 140 through the Internet network 130 as shown in the drawing.

The object-to-face Internet network 110 includes a plurality of object-based Internet devices 111. Each of the object-based Internet devices 111 includes various sensors and actuators, and performs predetermined functions according to a preset process do. For example, it is installed inside a building to detect a fire or to monitor the condition of an elevator. In addition, these object Internet devices 111 transmit and receive data to and from each other by a predetermined communication method.

Also in the underwater object internet network 120, there are a plurality of object internet devices 121 similar to the ground object Internet network 110. The underwater object Internet device 121 may be an underwater robot such as an autonomous underwater vehicle (AUV) and a remotely operated vehicle (ROV), a smart communication device carried by a diver or an underwater node fixed at a specific location. Particularly, in the underwater object internet network 120, the object internet gateway 122 is installed to transmit various sensing data detected in the underwater environment to the ground. The object Internet gateway 122 converts various commands and control signals transmitted from the ground and transmits the command and control signals to the underwater object Internet device 121. Conversely, the sensing data detected by the underwater object Internet device 121 is transmitted to the object Internet gateway 122 ) To the ground. Accordingly, the underwater object Internet apparatus 121 in the underwater object internet network 120 can communicate with the surface object Internet apparatus 111 of the surface object Internet network 110 through the object Internet gateway 122.

In order to search for and access various services provided in the ground object Internet network 110 and the underwater object internet network 120, it is necessary to check what kind of services the object Internet devices 111 and 121 belonging to the respective networks 110 and 120 provide Service discovery should be done. However, due to the characteristics of the underwater environment, there are more restrictions than the service discovery method used on the ground.

In order to enable creation of a variety of fusion services through searching and accessing various different types of services provided in the underwater and terrestrial object Internet networks 110 and 120, DNS based service discovery considered in the terrestrial object internet network 110 It is necessary to apply distributed P2P based service discovery method suitable for constrained environment such as underwater.

In order to achieve the above object, the present invention provides a service discovery by forming a lightweight P2P-based overlay network suitable for an underwater environment in the underwater object Internet device 111, and provides a mash- up service.

In particular, according to the present invention, control traffic for forming an underwater network topology generated in an underwater communication protocol operated in the underwater object Internet device 121 is utilized to minimize control traffic for forming a P2P overlay network.

2 is an illustration of an underwater object Internet network topology according to the present invention.

Referring to FIG. 2, three clusters (10, 20, 30) are illustratively shown for the sake of explanation in the underwater object Internet network topology according to the present embodiment. These clusters 10, 20 and 30 include a plurality of underwater internet devices A to I, respectively. Such a plurality of underwater object Internet devices A to I can constitute an ad-hoc wireless network communicating with each other wirelessly. An ad-hoc network is an infrastructure-less underwater network consisting purely of mobile nodes without the aid of a base station or AP (Access Point).

FIG. 3 is a block diagram of a configuration of an object Internet device for P2P-based service discovery according to an embodiment of the present invention.

3, the underwater object Internet apparatus 121 includes a cross-layer interface unit 1211, a service discovery function unit 1212, and an underwater object internet protocol unit 1213. The cross-

The cross-layer interface unit 1211 is connected to each layer of the underwater object Internet protocol unit 1213 of the underwater object Internet apparatus 121, that is, the physical layer 1213a, the data link layer 1213b, the network layer 1213c, (1213d). The physical layer 1213a handles the characteristics of the transmission medium and the interface rules for connecting the underwater object Internet device 121 with the transmission medium. The underwater object Internet device 121 must be connected to the physical layer 1213a through a transmission medium in order to transmit data through the underwater object Internet network 120. [ The data link layer 1213b provides a function of detecting a physical error that may be caused by various external factors such as noise in the process of transmitting data to the physical layer 1213a, Allowing the device 121 to recognize the error. The types of physical errors that can occur include loss of data that does not arrive, and data that arrives because the contents are corrupted. In general, error control in an underwater network is handled by a method in which a sender retransmits original data.

The network layer 1213c can select the correct route in the course of passing through various intermediary systems in order for the data transmitted by the transmitting-side underwater object Internet apparatus 121 to arrive at the receiving-side underwater object Internet apparatus 121 . The function of the intermediary system is generally performed by the router equipment. When the network load increases, congestion may occur in a specific area. Since this is also related to the transmission path of the data, the network layer 1213c controls the network. In addition, the transport layer 1213d provides a connection function between the transmission process and the reception process to support secure data transmission between processes. The final subject to exchange data in the underwater network is not the object Internet host system, but a process running on the host.

The underwater object Internet Protocol layer 1213 is located above the underwater object Internet application layer 1214, and the application layer 1214 supports various network application environments of the user. The function is not limited to one field but can be set very broadly. The underwater object Internet protocol unit 1213 may communicate with another object Internet apparatus via the underwater communication modem unit 1217, that is, another underwater object Internet apparatus 121 of the underwater object Internet network 120, The ground object Internet device 111 of the Internet network 120, and the like.

In the present invention, the underwater object internet protocol unit 1213 receives a P2P overlay network information request for service discovery from the service discovery function unit 1212, and transmits the P2P overlay network information request to the corresponding underwater object Internet apparatus 121 ), And starts piggyback processing of the P2P overlay network information when performing the update. At this time, the underwater object internet protocol unit 1213 requests the service discovery function unit 1212 for the local P2P overlay network information to be piggybacked in the extension header when the update to the topology is performed. The underwater object internet protocol unit 1213 piggybacks the local P2P overlay network information received from the service discovery function unit 1212 in an extension header of the packet for updating the underwater object Internet network topology and updates the underwater object Internet network topology And completes the piggyback processing of the P2P overlay network information. Here, the underwater object Internet protocol unit 1213 is preferably configured to perform an update on the underwater object Internet network topology according to a predetermined period. When a request for P2P overlay network information for service discovery is received from the service discovery function unit 1212 as described above, the update to the underwater object Internet network topology is performed without a predetermined period, and at this time, The service discovery function unit 1212 requests the local P2P overlay network information to be piggybacked on the extension header.

The service discovery function unit 1212 communicates with the respective layers 1213a to 1213d of the underwater object Internet protocol unit 1213 via the cross layer interface unit 1211 to perform P2P based service discovery in the underwater network according to the present invention Function. For this purpose, a P2P overlay network is formed and a corresponding service is searched and responded to when service discovery is requested from other Internet devices on the ground or underwater. The service discovery function unit 1212 includes a service discovery management unit 1212a, a P2P overlay network management unit 1212b, a message processing unit 1212c, a query unit 1212d, an overlay network information management unit 1212d, 1212e.

The service discovery function unit 1212 according to the present invention communicates with a plurality of sensors 1216 through a predetermined sensor interface unit 1215 to transmit commands to the sensors 1216 and to generate information for forming a P2P overlay network And transmits the sensed data to the underwater object Internet protocol unit 1213. [

The service discovery management unit 1212a controls the overall operation of the service discovery function unit 1212 and controls the underwater object Internet apparatus 121 to perform a procedure for forming a P2P overlay network, And performs a linkage function with the terrestrial object Internet device 111.

The P2P overlay network management unit 1212b functions to form and manage an overlay network based on the P2P protocol through the cross layer interface unit 1211 and the sensor interface unit 1215. [ Specifically, when a control signal for forming a P2P overlay network is received from the service discovery management unit 1212a, the P2P overlay network management unit 1212b transmits a control signal for forming a P2P overlay network to the underwater object Internet 1212 via the cross- And requests the P2P overlay network information from the underwater object Internet protocol unit 1213 to the underwater object Internet network 120 to which the underwater object Internet apparatus 121 belongs when the underwater object Internet network topology is updated Upon receiving a request for a local P2P overlay network information to be piggybacked in the header, the local P2P overlay network information is searched according to the request, responded to the underwater object Internet protocol unit 1213, and the P2P overlay network information is transmitted from the underwater object Internet protocol unit 1213 to the P2P overlay network When an information response is received, the P2P overlay Thereby completing this network formation.

The message processing unit 1212c generates a message for requesting the P2P overlay network information to be sent to the underwater object Internet protocol unit 1213 and a response of the local P2P overlay network information and transmits a message for the local P2P overlay message received from the underwater object Internet protocol unit 1213 Analyzes the message for the request of the network information and the response of the P2P overlay network information.

The query unit 1212d performs a query for a service search request and a query for a command to a sensor through the cross layer interface unit 1211 and the sensor interface unit 1215, respectively. This query is to query the service for service discovery and the request to acquire the sensing data from the sensor.

The overlay network information management unit 1212d processes and manages the collected overlay network information. The overlay network information management unit 1212d analyzes and processes the response of the P2P overlay network information received from the underwater object Internet protocol unit 1213 in the P2P overlay network management unit 1212b, Thereby forming a network.

The overlay network information storage unit 1212e stores the overlay network information analyzed and processed by the overlay network information management unit 1212d.

4 is a flowchart illustrating a P2P-based service discovery method according to an embodiment of the present invention.

Referring to FIG. 4, the P2P-based service discovery method according to the present invention provides an example applied to the underwater object Internet device 121. FIG. To this end, in the P2P-based service discovery method according to the present invention, a process of forming a P2P overlay network in the underwater object Internet device 121 and a process of providing a service discovery request from another object Internet device 111 or 121, Searching for the corresponding service, and providing a response to the service discovery request.

As shown in FIG. 4, in the P2P-based service discovery method, the service discovery function unit 1212 initializes the P2P overlay network to initiate or update the P2P overlay network (S101). Then, the service discovery function unit 1212 requests P2P overlay network information to form a P2P overlay network with the underwater object Internet protocol unit 1211 (S103). In response to the request of the P2P overlay network information, the underwater object Internet protocol unit 1211 updates the underwater object Internet network topology to which the corresponding underwater object Internet apparatus 121 belongs (S105) A piggyback process of information is started (S107). At this time, the underwater object internet protocol unit 1213 is preferably configured to perform an update on the underwater object Internet network topology according to a predetermined period. However, if the request for P2P overlay network information for service discovery is received from the service discovery function unit 1212 as described above, the update is performed on the underwater object Internet network topology even if the period is not the period. The piggyback applied in the process of forming the P2P overlay network is transmitted to the data link layer 1213b, the network layer 1213c and the transport layer 1213d of the underwater object Internet protocol unit 1211 via the cross layer interface 1211 To be piggybacked on a packet of the underwater communication protocol generated upon updating of the underwater object Internet network topology of the Internet. This makes it possible to reduce the traffic load due to the P2P protocol.

Subsequently, the underwater object Internet protocol unit 1213 transmits a request for the local P2P overlay network information to be piggybacked to the extension header to the service discovery function unit (step < RTI ID = 0.0 > 1212 (S109), the service discovery function unit 1212 searches the local P2P overlay network information according to the request of the local P2P overlay network information (S111), and transmits the retrieved local P2P overlay network information to the underwater object And transmits it to the Internet protocol unit 1211 in response (S113).

The underwater object Internet protocol unit 1211 piggybacks the received local P2P overlay network information in the extension header of the packet for updating the underwater object Internet network topology (S115), completes the updating of the underwater object Internet network topology, The piggyback processing of the network information is completed (S117).

Thereafter, the underwater object Internet protocol unit 1211 transmits a response of the P2P overlay network information to the service discovery function unit 1212 (S119), and the service discovery function unit 1212 completes the formation or update of the P2P overlay network (S121).

At this time, in the present invention, an extension header for P2P-based service discovery may be applied to a header of an existing protocol used in the underwater object Internet protocol unit 1211. [ This is to piggyback the control packet for maintaining the topology of the underwater object Internet network 120 in the underwater communication protocol. As a result, it is not necessary to provide a separate control packet to maintain the topology, so that the occurrence of additional traffic is minimized.

Thereafter, when the underwater object Internet protocol unit 1213 receives a service search request from another object Internet apparatus 111 or 121 on the ground or underwater (S123), the service discovery function unit 1212 transmits the service corresponding to the service The discovery request is transmitted (S125). Then, the service discovery function unit 1212 analyzes the requested service discovery (S127) and transmits a service discovery response to the underwater thing Internet protocol unit 1213 (S129). The underwater object Internet protocol unit 1213 transmits a response to the service search request from the other object Internet device 111 or 121 on the ground or underwater using the received service discovery response (S131).

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110: Ground-based Internet Network 111: Ground-based Internet Device
120: Underwater Internet Network 121: Underwater Internet Device
1211: Cross layer interface unit 1212: Service discovery function unit
1213: Underwater Things Internet Protocol Part 1214: Underwater Things Internet Application Layer
1215: Sensor interface unit 1216: Sensor unit
1212a: service discovery management unit 1212b: P2P overlay network management unit
1212c: message processing unit 1212d: query unit
1212e: overlay network information management unit
1212f: Overlay network information storage unit
1213a: physical layer 1213b: data link layer
1313c: Network layer 1213d: Transport layer

Claims (12)

1. An underwater object Internet device performing a ground object Internet device and a service discovery function,
Transmitting a request for P2P overlay network information for service discovery from the service discovery function unit to an underwater object internet protocol unit;
The underwater object internet protocol unit updates the underwater object Internet network topology to which the underwater object Internet apparatus belongs according to the request of the P2P overlay network information and performs the piggyback processing of the P2P overlay network information at the time of the update Starting;
Requesting, by the underwater object internet protocol unit, the local P2P overlay network information to be piggybacked in an extension header of a packet for updating the topology, when the update to the topology is performed, from the service discovery function unit;
Retrieving local P2P overlay network information according to the request from the service discovery function unit and transmitting the local P2P overlay network information in response to the underwater object internet protocol unit;
Wherein the underwater object internet protocol unit piggybacks the received local P2P overlay network information in an extension header of a packet for updating the underwater object Internet network topology and completes updating of the underwater object internet network topology, A step of completing a piggyback process of the step
Receiving, by the service discovery function unit, the response of the P2P overlay network information from the underwater object internet protocol unit and completing the formation of the P2P overlay network; And
Wherein the service discovery function unit performs a service search according to the service search request when a service search request is received from another object Internet apparatus and transmits the result of the service search to the other object Internet apparatus P2P based service discovery method in. The method according to claim 1,
The underwater object internet protocol unit and the service discovery function unit communicate with each other through a cross layer interface unit. The cross layer interface unit includes a physical layer, a data link layer, a network layer and a transport layer of the underwater object internet protocol unit, A P2P - based service discovery method in an underwater object Internet device that handles communication between the devices. The method according to claim 2,
Wherein the subscriber station piggybacks a packet of an underwater communication protocol generated at the time of updating the underwater object Internet network topology at the data link layer, the network layer, or the transport layer of the underwater object Internet protocol unit through the cross layer interface. Service discovery method. The method of claim 3,
And applying an extension header for the P2P-based service discovery to the header of the underwater communication protocol of the underwater object internet protocol unit. The method of claim 3,
The service discovery function communicates with a plurality of sensor units through a predetermined sensor interface, transmits commands to the plurality of sensor units, receives sensing data as information for forming the P2P overlay network, and transmits the sensing data to the underwater object Internet protocol unit A P2P - based service discovery method in an underwater object Internet device. An underwater object internet protocol unit for communicating with a terrestrial object Internet device or another underwater object internet device using a ground or underwater communication protocol;
A service discovery function unit communicating with the underwater object internet protocol unit and forming a P2P overlay network for performing service discovery, performing a service search according to a service search request and responding to a service search result; And
A cross-layer interface unit for processing an interface for communication between the underwater object internet protocol unit and the service discovery function unit; An underwater object Internet device. The method according to claim 6,
Wherein the cross-layer interface unit handles communication between the physical layer, the data link layer, the network layer, and the transport layer of the underwater object Internet protocol unit and the service discovery function unit. 8. The method of claim 7,
The service discovery function unit communicates with a plurality of sensor units through a predetermined sensor interface unit, transmits commands to the plurality of sensor units, receives sensing data as information for forming a P2P overlay network, and transmits the sensing data to the underwater object Internet protocol unit Things Internet Devices. 9. The service discovery method according to claim 8,
Collecting sensing information for forming a P2P-based overlay network through the sensor interface unit, requesting P2P overlay network information from the underwater object Internet protocol unit to form a P2P-based overlay network through the cross-layer interface unit, The P2P overlay network information searching unit searches the local P2P overlay network information according to the local P2P overlay network information request from the object internet protocol unit and responds to the underwater object internet protocol unit when the P2P overlay network information is received from the object internet protocol unit, A P2P overlay network management unit for completing formation;
A message for a P2P overlay network information request to be transmitted to the underwater object internet protocol unit and a message for a local P2P overlay network information response and a message for a local P2P overlay network information request and a P2P overlay network information response received from the underwater object internet protocol unit A message processor for analyzing the message;
A query unit for performing a query for a service discovery request and a query for an instruction to a sensor unit through the intersection layer interface unit and the sensor interface unit;
An overlay network information management unit for processing and managing the received overlay network information;
An overlay network information storage unit for storing overlay network information analyzed and processed by the overlay network information management unit; And
And controlling the overall operation of the service discovery function unit and performing a procedure for forming a P2P overlay network in the underwater object Internet device. The method of claim 9, wherein the underwater object internet protocol unit comprises:
Upon receiving the P2P overlay network information request from the P2P overlay network management unit, performs an update on the underwater object Internet network topology to which the underwater object Internet apparatus belongs according to the request of the P2P overlay network information, And when receiving the response of the local P2P overlay network information from the P2P overlay network management unit, transmits the received local P2P overlay network information to a destination of the packet for updating the underwater object Internet network topology Piggybacking on the extension header and completing an update of the underwater object internet network topology to complete the piggyback processing of the P2P overlay network information. 11. The method according to claim 10,
And piggybacks a packet of the underwater communication protocol generated at the time of updating the underwater object Internet network topology at the data link layer, the network layer, or the transport layer of the underwater object internet protocol unit through the cross-layer interface. 12. The method of claim 11,
And applying an extension header including P2P overlay network information for the P2P-based service discovery to the header of the underwater communication protocol of the underwater object internet protocol unit.

Images