KR100748096B1 - Adaptive service discovery method in mobile ad-hoc network(manet) - Google Patents

Abstract

An adaptive service searching method in an MANET(Mobile Ad hoc Network) is provided to be capable of forming a virtual network between nodes having SIP(Session Initiation Protocol) functions, and to enable a node receiving a service request to notify a service requester of the time when a service is available, thus the service can be adaptively searched in the MANET. A virtual network is configured according to roles of each node(100,200,400). Among the nodes(100,200,400), the service request node(100) demands a service to the temporarily selected service registration node(400) in the virtual network(S110-S190). If the service supply node(200) registers the service in the service registration node(400), the service registration node(400) notifies the service request node(100) of availability of the service and address of the service supply node(200)(S200-S290). The service request node(100) demands the service to the service supply node(200) to use the service(S300).

Description

Adaptive Service Discovery Method in Mobile Ad-hoc NETwork (MANET)

1 is a view showing a SIP-based session control process applied to the present invention,

2 is a view showing a control process for a SIP event framework based service applied to the present invention;

3 is a block diagram of a SIP event framework for service discovery on a mobile ad hoc network (MANET) according to an embodiment of the present invention;

4 is a conceptual diagram in which nodes having a SIP event framework according to the present invention form a virtual network on a MANET;

5 is a diagram illustrating a network configuration for adaptive service discovery on a MANET according to an embodiment of the present invention;

6 is a flowchart illustrating an adaptive service discovery process on a MANET according to an embodiment of the present invention;

7 is a diagram schematically illustrating a configuration in which a new node participates in a virtual network on a MANET according to an embodiment of the present invention;

8 is a network diagram showing an adaptive service discovery method in a MANET according to an embodiment of the present invention; and

9 is a network diagram illustrating an example in which a registrar node terminates network participation in a MANET according to an embodiment of the present invention.

The present invention relates to an adaptive service discovery method in a mobile ad-hoc network, and in particular, between nodes equipped with a Session Initiation Protocol (SIP) event framework in a MANET environment. The present invention relates to an adaptive service discovery method in a MANET that adaptively discovers a service providing node so that a virtual network can be formed in the network and adaptively provide a service according to the change of the network.

Mobile Ad-hoc Network (hereinafter referred to as MANET) refers to a communication network in a wireless area composed only of mobile terminals without a wired network, and provides an Internet service by forming a communication network in a mountainous area where a wired base is not established. Technology. At this time, the transmission and reception of the radio signal utilizes the current data link technology and the router function allows the mobile terminal of the MANET to act as a host and a router at the same time. need.

As such, MANET is a network autonomously configured with mobility nodes without the help of the existing infrastructure environment. Every node in MANET moves with mobility. Therefore, the network structure is very dynamic and flexible. In addition, when using the MANET, not only the existing Internet-based resources can support the communication between users, but also the multi-hop support eliminates the distance limitation of the communication. Due to these characteristics, there is an advantage in that it can support user's communication anytime and anywhere. Accordingly, MANET is receiving a lot of attention as a core network technology that will correspond to the ubiquitous environment in the future.

Meanwhile, there is a growing interest in 'Service Discovery', which searches for and automatically sets up a server providing various services (eg, a print service, ticketing service, game service, streaming server, etc.) on a network. . This service search function has a great advantage in that it can support a user's convenient use of network resources without requiring expert network knowledge. Especially in the case of very dynamic ad hoc network such as MANET, it is very difficult to set up users one by one. Therefore, researches on how to provide service discovery on MANET have been actively conducted. However, since routing support under a highly dynamic MANET environment has performance limitations, it is a reality that there is a limitation in improving the method of providing service discovery.

The service discovery method in MANET can be classified into a centralized method and a decentralized method according to whether a centralized service manager exists. In a centralized approach, there is a separate server called a service directory that provides the service IDs available in the network. In addition, a node capable of providing a service (hereinafter, referred to as a 'service provider') registers a type and ID of a service provided by the service directory in the service directory. In addition, a node that requests and uses a service (hereinafter referred to as a service demand node) is a method of finding a service providing node that can provide a desired service by accessing a service directory server of a corresponding service providing node. . However, this centralized method is not suitable in the MANET environment where all nodes can be mobile because the network structure is highly dependent on the service directory. In particular, if the service directory server itself moves from the MANET and becomes unavailable, nodes in the entire network cannot use the service.

In contrast, the distributed method is a method in which each node in a network obtains information on a corresponding service providing node for a specific service without having a separate directory server, and is a push-based method and a pull according to a transaction subject of the information. It can be divided in a -based manner. In the push-based method, a service providing node providing a service periodically transmits its own information, and the service requesting node stores such information and finds and uses the service providing node when necessary. Since service information must be periodically transmitted to the entire network, a large number of control packets are generated in proportion to the number of service providing nodes. Therefore, there was a problem that the performance of the entire network is degraded.

In addition, the pull-based method is a method in which a service request node finds a service providing node by transmitting a request message to the entire network when a corresponding service is required. This approach can reduce the number of control packets in the network relative to the push-based approach. However, there is a problem in that a time delay occurs because the process of finding a service providing node that provides a service is additionally required.

Furthermore, even when the push-based and pull-based schemes are mixed, the number of packets required for service discovery cannot be minimized and the mobile ad hoc network cannot be actively responded to.

The present invention has been proposed to solve the above-described problems, and in the MANET by forming a virtual network between nodes having SIP functions in the MANET environment, and notifying the service requester when the node receiving the service request is available for the service. The purpose of the present invention is to provide an adaptive service discovery method in MANET, which enables the adaptive service discovery.

In addition, the present invention forms a virtual network between nodes having a SIP function in a MANET environment, and adaptive service discovery in MANET to adaptively search for a desired service in the new node when a new node joins the virtual network. There is another purpose in providing a method.

Furthermore, the present invention forms a virtual network between nodes having a SIP function in a MANET environment, and when the existing node withdraws from the virtual network, the corresponding service can be adaptively searched by another node connected to the withdrawn node. Another purpose is to provide an adaptive service discovery method in MANET.

In order to achieve the above object, the present invention provides a method for adaptive service discovery in a mobile ad hoc network (MANET) including a plurality of nodes based on a session initialization protocol (SIP),

A first step of configuring a virtual network according to the role of each node; Requesting a corresponding service from a service registration node temporarily selected by a service requesting node among the nodes on the virtual network; A third step of the service registration node notifying the service requesting node of the address of the service providing node and the availability of the service when a service providing node of the nodes registers the service with the service registration node; And a fourth step in which the service requesting node requests and uses the service from the service providing node.

In one embodiment of the present invention, the first step preferably configures the virtual network with a service registration node, a service providing node and a service request node according to the role of each node.

In one embodiment of the present invention, the first step configures the node having the most time participating in the virtual network or the cluster header supporting the SIP framework on the MANET as the service registration node.

In an embodiment of the present invention, the second step may include the service requesting node reserving a request for the service from the service registration node.

In an embodiment of the present invention, the third step includes: the service registration node receiving the service request from the service request node; Determining whether the service is registered; Notifying the service requesting node of the service providing node that has registered the service and availability of the service if it is registered; And if not registered, store the service in a service delay list, and after registering the service in the service providing node, the service request node sends the address of the service providing node and the availability of the service to the service request node. The notification may include the step of notifying.

In addition, the present invention for achieving the above object, in the adaptive service discovery method in a mobile ad hoc network (MANET) including a plurality of nodes based on Session Initiation Protocol (SIP),

A first step of configuring a virtual network according to the role of each node; If a new first node joins the virtual network, transmitting a SUBSCRIBE message to other nodes connected to the first node by multicast; A third step of notifying the first node of information of a service registration node connected to the second node when the second node receives the subscription message; And setting a second node as a proxy server for the first node.

In one embodiment of the present invention, the first step preferably configures the virtual network with a service registration node, a SIP proxy server, a service providing node, and a service requesting node according to the role of each node.

In one embodiment of the invention, requesting a service from the first node to the service registration node; Checking whether the service is registered with the service registration node; Notifying the SIP node of the service providing node that registered the service and availability of the service to the first node, if registered; And notifying the SIP node of the service providing node and the availability of the service to the first node when the service providing node providing the service registers the service to the service registration node if not registered. It may further include.

In addition, the present invention for achieving the above object, in the adaptive service discovery method in a mobile ad hoc network (MANET) including a plurality of nodes based on Session Initiation Protocol (SIP),

A first step of configuring a virtual network according to the role of each node; A second step of transmitting, when the first node leaves the virtual network, the first node transmits an info message containing the exit information of the network to a node connected to the first node; A third step of transmitting a SUBSCRIBE message by multicast from a second node connected to the service registration node when the first node is a service registration node; And a fourth step of notifying the second node of information of another service registration node connected to the third node in the third node receiving the subscription message.

In one embodiment of the present invention, the first step preferably configures the virtual network with a service registration node, a SIP proxy server, a service providing node, and a service requesting node according to the role of each node.

In one embodiment of the invention, requesting a service from the second node to the service registration node; Checking whether the service is registered with the service registration node; If registered, notifying the SIP node of the service providing node that registered the service and the availability of the service to the second node; And notifying the SIP node of the service providing node and the availability of the service to the second node when the service providing node providing the service registers the service to the service registration node if not registered. It may further include.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, the present invention is not limited to the embodiments described below, and may be implemented in various forms. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like reference numerals designate like parts throughout the specification.

1 is a view showing a SIP-based session control process applied to the present invention.

Referring to FIG. 1, a SIP server controlling a SIP-based session is a server for relaying a SIP call, and has a SIP call registration and routing function. Such a server may be, for example, an SSW (Softswitch), a proxy server, a registrar, or the like, built by operators.

In order to establish a session between the user agents (UAs) 100 and 101, the first user agent 100 as a caller requests the second user agent 101 as a called party to establish a session. To this end, the first user agent 100 transmits the SIP address of the second user agent 101, which is the called party, to the first local proxy server 300 connected to the first local agent in an invite command. do. At this time, the first local proxy server 300 checks with the registrar 400 whether a current call is possible through the SIP address of the second user agent 101, and the second user agent 101 is checked. Send an INVITE command to the second local proxy server 301 connected with the. When the second local proxy server 301 transmits an invitation command to the second user agent 101, which is the called party, the second user agent 101 responds with a 200 OK message when the incoming call is possible. This message is notified to the first user agent 100 that is the sender through the second local proxy server 301 on the called party's side and the first local proxy server 300 on the calling party's side, and the first user agent 100 The session is created by sending an ACK message to the second user agent 101 that is the called party.

In general, the user agent (UA) 100, 101 has a user agent client (UAC) having a client function for initiating a SIP request and a user agent having a server function for receiving a SIP request and returning a response thereto. The server may be classified as a user agent server (UAS). The local proxy server 300, 301 determines where to send the request received from the user agent 100, 101 and then directly services or forwards it to other servers. The local proxy server (300,301) should be provided with a location service (location service) to know more exactly where the receiver is. The registrar 400 receives a user's current location registration request, registers a current location, and performs a function such as location update according to a user's movement. Communication between the user agents 100 and 101 is performed using a protocol for multimedia services, that is, a Real-time Transport Protocol (RTP).

2 is a diagram illustrating a control process for a SIP event framework based service applied to the present invention.

Referring to FIG. 2, the subscriber 100 and the resource owner 200 exchange a message with the SIP event server 500 after creating a session by the process of FIG. 1. When the subscriber 100 wants to use a specific service owned by the service provider 200, the subscriber 100 transmits a SUBSCRIBE message for the service to the SIP event server 500. The SIP event server 500 always sends a NOTIFY message to the subscriber 100 within a predetermined time.

If the resource provider 200 registers a specific service to the SIP event server 500 through the PUBLISH method, the SIP event server 500 notifies the subscriber 100 of the NOTIFY message. Notify this service via As such, the subscriber 100 receiving the notification message sends an invitation message to the resource provider 200 for the service as shown in FIG.

3 is a block diagram of a SIP event framework for service discovery on a mobile ad hoc network (MANET) according to an embodiment of the present invention.

Referring to FIG. 3, the SIP event framework according to an embodiment of the present invention supports SIP overlay mesh layer 32 and SIP events in addition to the MANET routing protocol layer 31 and the SIP application layer 34. It consists of a layer (Event Support Layer) 33. The SIP overlay mesh layer 32 participates in the virtual network on the MANET, configures the virtual network, and manages the tree roll 37 of the connected nodes. The SIP event support layer 33 manages the service list 35 and the blocked service list 36 running in the virtual network to search for specific services by searching for nodes capable of providing a specific service. do. In the SIP event framework of the present invention, an XML document is attached to a body of a SIP message, and this document includes information for network configuration and service discovery.

Furthermore, Table 1 below is classified according to the functions of mobile node nodes participating in an ad-hoc network. This classification is useful for selecting a registration server in an ad hoc network.

Classification of mobile node Classification function Service broker -Fixed device that facilitates network configuration in a building such as an airport-Role: Registrar, proxy server role Service provider -Register the service to the registration server and provide it to other mobile device-Role: Registrar, proxy server, user agent Service consumer -Only mobile device can search and use services-Role: User Agent Service agent -Provide service and use other service-Role: Registrar, proxy server, user agent

The SIP overlay mesh layer 32 is responsible for mobile node nodes configuring a virtual network on a MANET, and the SIP event support layer 33 is responsible for searching for a specific service in a virtual network.

4 is a conceptual diagram in which nodes having a SIP event framework according to the present invention form a virtual network on a MANET.

Referring to Figure 4, based on the SIP event framework of the present invention to configure the overlay network 42, which is a virtual network of SIP-based mobile terminal nodes on the physical network 41 of the MANET. This virtual network is configured by mobile node nodes in the SIP overlay mesh layer 32 as described above. In the virtual network of the overlay network 42 formed of a mesh, the nodes necessary for the service flow are sequentially executed between the subscriber node 100 and the service provider node 200 in the physical network 41 of the MANET for service provision. Do it.

When the mesh-implemented virtual network 42 is formed as described above, each node joins the network as a registrar, proxy server, and user agent (UA) in accordance with the role shown in Table 1 above. In addition, each of the nodes 100, 200, 300, and 500 may change its function or provide one or more functions in response to changes in network conditions. For example, registrars may have proxy server and user agent functions. Proxy servers can also have user agent capabilities. As another example, the user agent may be a node directly connected to a proxy server or registrar in a virtual network, which may be a proxy server or registrar as network changes.

5 is a diagram illustrating a network configuration for adaptive service discovery on a MANET according to an embodiment of the present invention.

Referring to FIG. 5, the user agent (UA) 100, 200 searches for one or more registrars 500 existing in the network to which the user agent (UA) 100, 200 receives the corresponding service through the SIP proxy server 300, and searches for the corresponding service through the SIP proxy server 300. SUBSCRIBE. That is, the service demand node 100 and the service provider node 200 among the user agents UAs respectively transmit the corresponding service through the SIP proxy server 300 connected to the registrar 500. Sign up for In addition, the service providing node 200 registers the corresponding service in the registrar 500 through the SIP proxy server 300. The registrar is a node that registers and manages the service from a service providing node that provides a service, and performs a function as a service registration node.

The service request node 100 transmits an INVITE message to the service providing node 200 through the SIP proxy server 300 and the registrar 500 and receives the invitation message. ) Provides the service. This service discovery method can minimize network traffic required for each node to search for a desired service.

Here, it should be noted that, as shown in FIG. 5, the user agent UA, that is, the service request node 100 and the service providing node 200, is not directly through the SIP proxy server 300, but directly through the registrar. It is connected with the 500 is that the service can be searched and registered. Hereinafter, a service searching process in the above configuration will be described in detail with reference to FIG. 6.

6 is a flowchart illustrating an adaptive service discovery process on a MANET according to an embodiment of the present invention.

Referring to FIG. 6, a user agent (UA), that is, a service request node 100 and a service providing node 200, is a registrar 500 existing in a virtual network configured on a MANET in which they participate in using a corresponding service. Search through the SIP proxy server 300 or directly subscribe (SUBSCRIBE) (S110 ~ S140), the registrar 500 is notified immediately in response to the subscription message (NOTIFY) message to the SIP proxy The server 300 transmits the service request node 100 and the service providing node 200 through the server 300 (S150 to S170). Here, the registrar 500 is a node temporarily selected to register and manage a specific service in a virtual network configured on the MANET.

The service request node 100 requests the corresponding service from the temporarily selected registrar 500 through (or directly) the SIP proxy server 300 connected thereto (S180 and S190). The registrar 500 checks whether the requested service is registered from the service request node 100 (S200), and if the service is registered, the address of the service providing node 200 that registered the service and the service The service request node 100 is notified to the service request node 100 through the SIP proxy server 300 (S210 and S220). After receiving the notification, the service request node 100 uses the service by requesting the service from the service providing node 200 using the address of the service providing node 200 (S230). A session connection between the service request node 100 and the service providing node 200 may be implemented as shown in FIGS. 1 and 2.

If the corresponding service requested by the service request node 100 is not registered in the registrar 500, the requested service is registered in the service delay list 35 (S240). The service registered in the service delay list 35 is for the nodes requesting the service after the service is registered in the registrar 500 and the service request comes in.

Thereafter, the service providing node 200 providing the service requested by the service requesting node 100 to the registrar 500 transmits the corresponding service through the SIP proxy server 300 (or directly) to the registrar. When registering to 500 (S250, S260), the registrar 500 notifies the service providing node 200 through the SIP proxy server 300 in response to the registration message (NOTIFY) message It transmits (S270, S280).

As such, when the service that is not registered in the registrar 500 is stored in the service delay list 35 (S240), the service providing node 200 providing the corresponding service stores the corresponding service in the registrar ( When registering to 500 (S260), the registrar 500 notifies the service request node 100 of the SIP address of the service providing node 200 that registered the service and the availability of the service. (S270, S290). The service request node 100 receiving the notification uses the corresponding service by requesting the service from the service providing node 200 using the SIP address of the service providing node 200. A session connection between the service request node 100 and the service providing node 200 may be implemented as shown in FIGS. 1 and 2.

The registrar 500 performs a function as a service registration node, registers and manages a service from a service providing node 200 that provides a service, and checks whether the requested service is available from the service request node 100. This is notified to the service request node 100.

The above-described nodes according to the present invention are nodes equipped with a framework, and in order to register, search for, and provide a service, a node must first form a virtual network composed of a mesh on a MANET. At this time, nodes equipped with the proposed framework in the MANET send a SUBSCRIBE message to multicast and wait for a response.

Initially, when configuring a virtual network in a mesh form, at least one registrar 500 must be set. Setting conditions of the registrar 500 are as follows.

1) It is a cluster header on MANET (see FIG. 4), and becomes a registrar when supporting the framework proposed by the present invention.

2) If at least one registrar is not found in the received SUBSCRIBE message, the node having the most time to join the network among the nodes with the same cluster ID becomes the registrar.

To set up such a registrar, each node is assigned to the node's properties (as shown in Table 1) in the body of the subscription message sent for initial network participation, the cluster ID composed of the MANET, whether the cluster header is present, and the corresponding cluster. Attached is an XML document that contains information such as the time of participation.

One or more registrars may exist in the mesh-like virtual network. The presence of multiple registrars can minimize the reconfiguration of mesh-like virtual networks in highly ad-hoc networks. Depending on the setting conditions of the registrar, the registrar may not exist or exist in each cluster of the MANET. When there is more than one registrar in the mesh-type virtual network, each registrar periodically updates and updates information on registered services. When a registrar is found in the mesh-type virtual network, nodes participating in the virtual network register their services with the registrar.

On the other hand, the structure of the virtual network of the mesh form can be changed by various conditions. Such a change in the virtual network occurs when a new mobile communication terminal node joins or an existing mobile communication terminal node leaves or moves to the network. The most significant change in the structure of the virtual network is when the registrar node leaves the maritime virtual network. At this time, if the registrar node leaves the virtual network, the virtual network must be reconfigured.

In the case where the registrar does not exist in the virtual network, there is no response (200 OK) to a registration and subscription message periodically sent by the SIP proxy server 300 or the user agent (UA) 100, 200. At this point, each node sends a SUBSCRIBE multicast message to find a registrar. If the SIP proxy server 300 or the user agent (UA) 100, 200, which is connected to another registrar session, receives the corresponding subscription message, the registrar information is notified to the node that sent the subscription message. If the node that sent the NOTIFY message is a user agent (UA), and the user agent (UA) node is a service broker, a service agent, or a service provider node, the node is a user agent (UA). The role changes from the UA) node to the SIP proxy server node. In this way, the SIP proxy server node becomes a proxy server for a specific user agent (UA), and routes a message transmitted to itself to an already connected SIP proxy server or registrar. This is similar to when a new node joins the network.

7 schematically illustrates a configuration in which a new node participates in a virtual network on a MANET according to an embodiment of the present invention.

Referring to FIG. 7, a new node MN10 participates in a mesh-type virtual network implemented on a MANET according to the present invention. The MN10 transmits a SUBSCRIBE message by multicast (S400). In the figure, MN7 switches from a user agent (UA) node to a proxy node and notifies the MN10 that MN4 and MN9 are register nodes. As a result, the MN10 sets the MN7 as a proxy node and the MN4 as a registrar node and starts searching for a service. The proxy node according to the invention is preferably a SIP-based proxy server.

As such, nodes participating in the mesh-type virtual network according to the present invention may register and discover a service. These services include standard services and user services. The service has a unique service ID. The standard service is a general service such as VoIP, picture transmission, video playback, and the user service may be a reservation system of a specific movie theater as shown in the use case of II. Each service can be easily provided because the service is defined in XML.

8 is a diagram illustrating a network configuration of an adaptive service discovery method in a MANET according to an embodiment of the present invention.

Referring to FIG. 8, the MN10 subscribes to the S1 service to the registrar node MN4 through the proxy node MN7 (S500, S510) to search for a service. The MN4 registers the s1 service on the service delay list because the s1 service is not yet registered. Thereafter, MN3 registers (PUBLISH) the s1 service (S520). The registrar node MN4 stores the requested s1 service in a service registration list, and sends a NOTIFY message informing the MN10 that the s1 service in the service delay list is available (S530, S540). ). The MN10 releases the notification request for the s1 service and sends an INVITE message to the s1 service of the MN3 to access the service (S550 and S560).

As such, in a mesh-type virtual network, each node can always terminate network participation. A node wanting to terminate network participation sends an INFO message to nodes connected to it. An XML document containing network termination information is attached to the body of the INFO message. The XML document may be set as a protocol in the framework according to the present invention.

9 is a network diagram illustrating an example in which a registrar node terminates network participation in a MANET according to an embodiment of the present invention.

Referring to FIG. 9, the registrar node MN4 sends an info message to which all the nodes connected to it, namely, MN3, MN6, and MN7, attached with an XML document containing network termination information of the MN4 (S600, S610, and S620). ). The user agent nodes MN9 and MN10 receive the info message from the MN6 and MN7 connected to themselves, respectively (S630 and S640). In this case, since the registrar node MN4 intends to terminate network participation, the registrar node MN4 does not need to receive a response message (200 OK) for the info message.

Due to the termination of network participation of the MN4, as shown in FIG. 9, the MN3 no longer exists a registrar node connected to the MN4, so as to send a SUBSCRIBE message to the multicast as shown in FIG. 7 again. MN6 finds a new registrar node MN9.

On the other hand, the MN7 selects the new registrar node MN9 and sends change information of the registrar node to the user agent node MN10 connected thereto as an info message. The MN10 sends a response message (200 OK) to the MN7, and if the MN9 has not yet searched for the s1 service, transmits a SUBSCRIBE message for s1 to the MN9.

If the MN4 leaves the network without sending the INFO message, the respective nodes do not receive a response message 200 OK for the REGISTER message that is periodically sent to the corresponding virtual network as described above. Reconstruct

The drawings and detailed description of the invention are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the appended claims or claims. Those skilled in the art will appreciate 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.

According to the present invention, it is possible to adaptively reconfigure the network according to the formation of the mobile ad hoc network (MANET) and the change of the network, and to minimize the amount of messages according to the discovery of the service and the network configuration.

Claims (11)

An adaptive service discovery method in a mobile ad hoc network (MANET) including a plurality of nodes based on a session initialization protocol (SIP), A first step of configuring a virtual network according to the role of each node; Requesting a corresponding service from a service registration node temporarily selected by a service requesting node among the nodes on the virtual network; A third step of the service registration node notifying the service requesting node of the address of the service providing node and the availability of the service when a service providing node of the nodes registers the service with the service registration node; And A fourth step of the service requesting node requesting and using the service from the service providing node; Adaptive service discovery method in a mobile ad hoc network (MANET) comprising a. The method of claim 1, wherein the first step, And a service registration node, a service providing node, and a service request node according to the role of each node. The method of claim 1 or 2, wherein the first step is Adaptive service discovery method in a mobile ad hoc network (MANET), characterized in that the service registration node comprises the node that has the most time to participate in the virtual network or the cluster header supporting the SIP framework on the MANET. The method of claim 1, wherein the second step, And wherein the service requesting node reserves a request for the service from the service registration node. The method of claim 1, wherein the third step, Receiving, by the service registration node, the service request from the service request node; Determining whether the service is registered; Notifying the service requesting node of the service providing node that has registered the service and availability of the service if it is registered; And If not registered, the service is stored in a service delay list. Subsequently, when the service providing node registers the service, the service requesting node notifies the service requesting node of the address of the service providing node and availability of the service. Making; Adaptive service discovery method in a mobile ad hoc network (MANET) comprising a. An adaptive service discovery method in a mobile ad hoc network (MANET) including a plurality of nodes based on a session initialization protocol (SIP), A first step of configuring a virtual network according to the role of each node; If a new first node joins the virtual network, transmitting a SUBSCRIBE message to other nodes connected to the first node by multicast; A third step of notifying the first node of information of a service registration node connected to the second node when the second node receives the subscription message; And Setting a second node as a proxy server for the first node; Adaptive service discovery method in mobile ad hoc network (MANET) including The method of claim 6, wherein the first step, And a service registration node, a SIP proxy server, a service providing node, and a service request node according to the role of each node. The method of claim 6, Requesting a service from the first node to the service registration node; Checking whether the service is registered with the service registration node; Notifying the SIP node of the service providing node that registered the service and availability of the service to the first node, if registered; And If not registered, notifying the first node of the service providing node's SIP address and availability of the service when the service providing node providing the service registers the service with the service registration node; Adaptive service discovery method in mobile ad hoc network (MANET) further comprising a An adaptive service discovery method in a mobile ad hoc network (MANET) including a plurality of nodes based on a session initialization protocol (SIP), A first step of configuring a virtual network according to the role of each node; A second step of transmitting, when the first node leaves the virtual network, the first node transmits an info message containing the exit information of the network to a node connected to the first node; A third step of transmitting a SUBSCRIBE message by multicast from a second node connected to the service registration node when the first node is a service registration node; And A fourth step of notifying the second node of information of another service registration node connected to the third node in response to receiving the subscription message; Adaptive service discovery method in a mobile ad hoc network (MANET) comprising a. The method of claim 9, wherein the first step, And a service registration node, a SIP proxy server, a service providing node, and a service request node according to the role of each node. The method of claim 9, Requesting a service from the second node to the other service registration node; Checking whether the service is registered with the service registration node; If registered, notifying the SIP node of the service providing node that registered the service and the availability of the service to the second node; And If not registered, notifying, by the service providing node providing the service, the service registration node to the service registration node, the SIP address of the service providing node and the availability of the service to the second node; Adaptive service discovery method in mobile ad hoc network (MANET) further comprising a

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