KR101371129B1 - Communication protocol for ship ad-hoc network - Google Patents

Abstract

According to the present invention, in an ad hoc communication method performed at a node for a network between marine mobile objects, a method of setting a communication mode for transmitting and receiving a message based on whether other nodes exist around the node and available channel conditions of the node is provided. An ad-hoc communication method comprising the steps of: a communication control setting step of setting and transmitting a message based on the reception target information included in the message and a type of the message; and transmitting and receiving a message according to the set communication mode and communication control setting step. And nodes.

Description

COMMUNICATION PROTOCOL FOR SHIP AD-HOC NETWORK}

The present invention relates to a method and a node for communication of an ad hoc network to a marine mobile vehicle such as a ship, and relates to an ad hoc communication that prevents collision of data packets due to communication of the marine mobile vehicle in a poor marine environment.

Marine communications services such as global maritime distress and safety systems (GMDSS) and automatic identification systems (AIS) are primarily limited to ship safety, location tracking, identification, search and surveillance. Although short message transmission services such as narrow band direct printing (NBDP) and navigational telex (NAVTEX) are also used on ships, marine radio communication is less versatile than land radio communication.

With the development of terrestrial wireless communication technology, there is a need for providing various multimedia services even in ships sailing offshore or near the sea. In other words, there is an increasing demand for vessels to access land network infrastructure and receive various multimedia services such as two-way digital data transmission, video, and Internet access, as on land.

To this end, the existing WLAN can be applied to the coast to provide services to ships, but the communication restriction is large due to the short communication distance within 1 km. Satellite communications, on the other hand, can guarantee a unique wide range of communication distances and high data rates, making it a strong candidate for providing a variety of ship multimedia services. However, satellite communication has a disadvantage in that service cost is burdensome to provide multimedia service to a ship frequently, such as on land.

For current maritime digital communications, ITU-RM. In 1842-1, VHF-band maritime digital communication is standardized, and this standard allows VHF-band communication to support data rates of around 100 kbps or more. Given that the transmission distance of the VHF communication band is several tens of kilometers, VHF band maritime digital communication can provide multimedia services to ships in lieu of satellite communication.

In the prior art, the patent application 2010-0028662 is a network called Ship Ad-hoc NETwork (SANET) that can cope with MANET and VANET on land in order to provide multimedia services to a ship by using an ad-hoc communication method in the VHF band. A form is disclosed. Network protocols for SANET can be designed based on protocols developed for land ad hoc networks. However, in order to apply the land ad hoc network protocol to maritime communication, it is necessary to reflect various situations that may occur at sea, such as whether there is a neighboring vessel, whether a route is set to a destination, and a communication mode change in a poor communication environment.

An object of the present invention is to provide a node for performing routing and medium access control (MAC) in one algorithm and a communication method thereof in consideration of a marine communication environment.

One embodiment of the present invention for solving the above-described technical problem is an ad hoc communication method performed in a node for a network between marine moving objects, based on whether there is another node around the node and the available channel situation of the node Setting a communication mode for transmitting and receiving messages; A communication control setting step of setting to transmit and receive the message based on the reception target information included in the message and the type of the message; It may be characterized by providing an ad hoc communication method comprising the step of transmitting and receiving a message according to the set communication mode and the communication control setting step.

The communication control setting may include setting a channel for transmitting and receiving a message when the node is included in the reception target information, and setting a node located close to the node as a transmission and reception target based on the reception target information. ; And if the node is not included in the reception target information, discarding the message and setting a delay time based on the type of the message.

Preferably, the setting of the delay time may include extracting a type of an additional message included in the message information and setting a delay time based on the extracted additional message type.

In addition, the setting of the communication mode may include detecting a carrier including information on whether there is another node around the node; Storing node identifier (ID) data included in the detected carrier; And setting a mode for transmitting and receiving a message for a node having the node identifier based on an available channel condition of the node.

Preferably, the setting of the mode may include determining a preset delay time when there is no available channel of the node, and setting the standby mode to wait according to the determined delay time; Setting to a frequency communication mode when there is an available channel of the node but no other node around the node exists; And setting an ad hoc communication mode when there is an available channel of the node and there is no other node around the node.

Another embodiment of the present invention for solving the above-mentioned technical problem is in an ad hoc communication node for a network between marine mobiles, transmitting and receiving a message based on whether another node exists around the node and available channel conditions of the node. Communication mode setting unit for setting a communication mode for A communication control setting unit configured to transmit and receive the message based on the reception target information included in the message and the type of the message; It may be characterized by providing an ad hoc communication node including a message transmitting and receiving unit for transmitting and receiving messages in accordance with the communication mode and communication control settings set.

By being used in a marine multiband band communication system and network, there is an effect of providing routing and medium access control (MAC) by integrating in a marine communication environment.

1 is a reference diagram for describing a SANET (SHIP AD-HOC NETWORK).
2 is a flowchart illustrating an ad hoc communication method according to an embodiment of the present invention.
3 is a flowchart illustrating a communication mode setting step of an ad hoc communication method according to an embodiment of the present invention.
4 is a reference diagram for explaining an embodiment of an ad hoc communication method of the present invention.
5 is a block diagram illustrating an ad hoc communication node according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or characteristic may be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

Embodiments of the present invention may be implemented by various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For a hardware implementation, the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to embodiments of the present invention may be implemented in the form of a module, a procedure or a function for performing the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of the specific terms may be modified in other forms without departing from the technical spirit of the present invention.

1 illustrates a SANET structure as a prior art. The SANET structure according to an embodiment of the present invention will be described with reference to FIG. 1. SANET refers to a network using an ad hoc communication method having a communication distance of several tens of kilometers under a topology in which nodes (for example, a ship in operation) are randomly scattered. As shown in FIG. 1, the SANET may be composed of a plurality of base stations (BSs) and marine vessels. Hereinafter, for convenience of explanation, the marine mobile body is assumed to be a marine vessel. The terrestrial base station (BS) is connected to a ground-based Internet Protocol (IP) back-bone network and provides a variety of multimedia services to marine vessels.

Since maritime vessels move along various routes according to their destination, the structure of SANET is not fixed and does not have a certain pattern. That is, marine vessels may be randomly scattered throughout the entire ocean, but are generally distributed more on the coast or coast than on the coast. The 'node' implemented in each of these maritime vessels can communicate with the surrounding maritime vessel (strictly speaking, the node embodied in the maritime vessel around it) or the land base station. To this end, each maritime vessel is equipped with a VHF (Very High Frequency) transceiver. On the other hand, each marine vessel is equipped with a communication system of HF (High Frequency) or satellite frequency band in preparation for VHF band communication disruption.

Of course, the fact that a certain node communicates with neighboring nodes assumes that the neighboring node is located within the communication distance of any node (within about 30 km in the case of VHF). Here, the communication distance means a distance at which a node can exchange information with another node. However, ships that deviate beyond the communication distance from the base station BS are difficult to access the base station by one-hop and attempt multi-hop ad hoc communication.

Meanwhile, nodes according to at least one embodiment of the present invention communicate with each other ad-hoc, and each of them transmits data received from its own data or neighboring nodes through a communication path defined by a given routing protocol .

In FIG. 1, when a ship to access a land base station and use a service is called a source, a neighboring ship receives messages transmitted by the transmitting ship when there are a plurality of neighboring ships within its communication distance. It is delivered to adjoining vessels via ad hoc communication and finally arrives at a land base station or destination vessel.

Accordingly, message information according to an embodiment of the present invention includes information for performing important decisions such as backoff time, message delivery, and waiting. The message information may be set in advance as a field, a value, etc. in the message header. That is, for example, the message information may include a message type (MT), followed by an additional message type (FMT), a ship ID (SI), and a target ship ID (TI). , Number of data packets (M), number of routing path hops (H), or number of remaining hops (N). The message type is a message type currently transmitted. For example, in case of an RTS message, the message type is 'MT = RTS' and in the case of a CTS message, 'MT = CTS'. The additional message type (FMT) refers to a message type to be transmitted through an RTS-CTS message exchange. The FMT includes a route reply (RREP), data, and non-acknowledgement (NACK). Ship ID (SI) represents an identifier (Idnetification: ID) of the ship that transmits the message. The target ship ID (TI) indicates the ID of the ship to which the message is to be finally transmitted. The number H of routing paths is used for the RREP message. That is, when the RTS message is sent before the RREP message is transmitted, the neighboring vessels are informed of the number of routing path multi-hops to set the backoff time. The number M of data packets is used to apply a packet train that transmits several messages or packets in succession. That is, information for calculating a backoff time by checking the value of M when neighboring vessels receive an RTS or CTS message. The remaining number of hops (N) is the routing and data transmission in the SANET through multi-ad hoc communication, where the number of multi-hops between the sending vessel and the receiving vessel is the backoff time when neighboring vessels receive an RTS or CTS. It is used to calculate.

2 is a flowchart illustrating an ad hoc communication method according to an embodiment of the present invention. Referring to FIG. 2, an ad hoc communication method performed at a node for a network between marine mobiles according to an embodiment of the present invention will be described.

In step S100, a communication mode for transmitting and receiving a message is set based on whether other nodes exist around the node and available channel conditions of the node.

It is determined whether the communication mode set in step S110 is an ad-hoc communication mode. If the communication mode does not correspond to the ad-hoc communication mode, the communication mode is set to a frequency communication mode and the ad-hoc communication is performed. If the mode is applicable to the ad hoc communication mode.

In step S120 check the reception target information. It is checked whether the node according to the embodiment of the present invention is included in the reception target information. The reception target information is information including an identifier (ID) of a target node to which a message is to be transmitted, and may be implemented as a routing list.

In step S130, when it is confirmed that the node is included in the reception target information, the channel setup and transmission and reception target are set. That is, when a node according to an embodiment of the present invention is included in the reception target information, a channel for transmitting and receiving a message is set, and a node located close to the node is set as a transmission / reception target based on the reception target information.

If it is confirmed that no node is included in the reception target information, the message is discarded (S140), and a delay time based on the message type is set (S150).

In step S140, if the node is not included in the reception target information, since the node does not need to be transmitted or retransmitted in the node, the received message is deleted. For example, when the reception target information is implemented as a routing list, if the node is not included in the routing list, the received message is discarded.

In step S150, the type of the additional message included in the message information is extracted, and a delay time is set based on the extracted additional message type. The delay time includes the backoff time, which is basically set according to Binary Exponential Backoff (BOB), which is RREP, Data, or NACK depending on the additional data (FMT) type. The back off time is set.

According to an embodiment of the present invention, when the additional message type is an RREP message, the delay time may be set based on the hop number of the routing path included in the header of the received message. That is, when receiving an RTS or CTS message for transmitting and receiving an RREP as additional data, a delay time based on the number of hops (H) of the routing path of the received message information when its address is not included in the destination information. Set. According to an embodiment of the present invention, the delay time may be calculated by multiplying the number of hops (H) of the routing path by the delay time set according to the hop from the user. Alternatively, the delay time may be set using a data table in which the delay time according to the hop number H of the routing path is set in advance. That is, by delaying the data transmission for the time period considering the RTS-CTS-RREP transmission until the RREP is delivered to the transmitting vessel through the H hops, it is possible to prevent from packet collision due to the transmission and reception of messages from multiple nodes. Overlap data transfer can be prevented.

According to an embodiment of the present invention, when the additional message type is a data type or NACK (NON-ACKNOWLEDGEMENT), the delay time is calculated based on the number of data packets of the message and the number of remaining hops between the transmitting node and the receiving node. do. That is, when receiving RTS or CTS message for transmitting / receiving data or NACK (NON-ACKNOWLEDGEMENT) as additional data (FMT), if the node is not included in the reception target information or the data does not match the TI, the data of the received message information The delay time is set based on the number M of packets and the number N of hops remaining between the transmitting node and the receiving node. According to an embodiment of the present invention, when one data packet is transmitted to a destination vessel through the remaining hops, N * is multiplied by the number of remaining hops N times the predetermined delay per individual hop T from the user. Calculate T as the delay time and multiply the number of data packets (M) to set the delay time as M * N * T. Alternatively, according to an embodiment of the present invention, the time considering the RTS-CTS-DATA-one hop ACK transmission may be set as a delay time in consideration of the one hop Ack transmission.

In step S160 transmits and receives a message according to the set communication mode and the communication control setting step. That is, when the frequency mode is set, the message is transmitted and received using satellite or high frequency / medium frequency. When the ad hoc communication mode is set, the message is transmitted and received through the transmission path set using the RREQ / RREP.

3 is a flowchart illustrating a step of setting a communication mode according to an embodiment of the present invention. Referring to Figure 3 will be described in more detail for the step of setting the communication mode according to an embodiment of the present invention.

In a node for an ad hoc network between marine mobiles according to an embodiment of the present invention, when power is supplied to the node, carrier sensing is performed to enter the ad hoc network (S200).

In step S210, by detecting the carrier in step S200, it is checked whether the detected node is stored in a storage unit (not shown) such as a memory of the node according to the embodiment of the present invention. That is, when the ship ID (SI) in the message included in the carrier is not stored in the neighboring vessel of its own, it is stored by adding a node identifier (ID) of the neighboring vessel to the data table (S220).

In step S230 it is checked whether there is an available channel of the node. A channel generally refers to an individual path through which data flows, and checks whether there is an available channel for transmitting data at the node.

If it is determined in step S240 that no available channel exists, a standby mode setting step (S250) or a step of checking whether a neighbor node exists (S260) is performed.

If there is no available channel at step S250, it is determined by a preset delay time according to the type of message, and waits according to the determined delay time. For example, if the delay time according to the RREP message is 1ms, the delay time of 2ms is set for the data message or the NACK message, and if there is no available channel but wants to transmit the RREP message, the delay is preset to 1ms. Wait for sending and receiving messages over time. If the message is not an RREP, data message or NACK message, the message waits for transmission and reception according to a binary exponential backoff (BOB). If the backoff time is expired, try again from the step S200 to enter the network.

In step S260, since an available channel exists in the node, it is determined whether a neighboring node exists. If there is no neighbor node, it is set to the frequency communication mode (S270), and if there is a neighbor node, it is set to the ad hoc communication mode (S280).

In step S270, if there is an available channel in the node, but no other node around the node is set to the frequency communication mode. According to an embodiment of the present invention, a network failure message is broadcast and a communication mode is switched to equipment using satellite or high frequency (HF) / medium frequency (MF). Communication mode switching is performed in the data link layer Logical Link Control (LLC), and a detailed description of how it is performed in frequency communication mode is given in “Design of multiband maritime network for ships and its applications,” (C. Yun et al. Int. J. of KIMCS, vol. 7, no. 3, pp.314-322, Seplt. 2009) and “Design of a multi-network selector for multiband maritime networks” (A-ra Cho et al., J. 4). of KICS, vol. 9, no. 5, pp. 523-529, Oct. 2011).

An embodiment of an ad hoc communication method of the present invention will be described with reference to FIG. In order to transmit data using an ad hoc network having a multi-hop to a receiving vessel as a transmitting vessel (hereinafter, it is assumed for convenience that all vessels are equipped with a node according to an embodiment of the present invention), the first channel Check availability and availability of neighboring vessels.

A node broadcasts an RREQ message when there are available channels and other nodes in the vicinity. Unlike RREP, data, and NACK messages, RREQ messages are broadcast and propagated rather than RTS-CTS message exchanges.

According to the routing path setting method of AODV (Ad hoc On demand Distance Vector), the receiving ship receives the RREQ message of the sending ship and prepares to transmit the RREQ message. When sending the RREQ message to the receiving ship, the ships receiving the RREQ message wait for the BOB backoff time, check the channel status, and then broadcast the RREQ message again.

In order to send a RREP message on a receiving ship, unlike a RREQ message, an RTS-CTS message exchange should be given priority and occupy a channel. The receiving ship sends an RTS message after checking the channel status. If the channel is busy, BOB and try again.

Therefore, referring to Fig. 4, for example, the transmission vessel (SI = 1) and the receiving vessel (SI = 4), the route is determined by the ship identifier (SI) 1-2-3-4 (H = 3). do. When the receiving ship (SI = 4) sends an RTS message for sending an RREP message, the TI is 3. If the TI of the RTS message received in the neighboring ship of the receiving ship is not itself (a ship with SI = 8), the received RTS message is ignored or discarded, and the delay time when the sending ship is 'FMT = RREP' in consideration of the value of H Calculate and wait. Since the standby mode is set for the delay time reflecting the H value, a collision with a neighboring vessel does not occur when the receiving vessel delivers the RREP to the transmitting vessel. The ship with SI = 3 checks the channel status after receiving the RTS message, transmits the CTS message, and the receiving ship (SI = 4) receiving the CTS message from the ship with SI = 3 transmits the RREP message. The SI = 3 ship delivers the RREP message to the next delivery ship (SI = 2) via the RTS-CTS message exchange in the same way, referring to the routing list (1-2-3-4) indicated in the RREP message. At this time, the value of H is reduced by one (H = 2) to transmit the RTS message. This is to reduce the backoff time due to (SI = 7) RTS message of neighboring vessels. In this way, the RREP message is finally delivered to the sending ship to establish the communication path.

When the sending ship receives the RREP message, it sends a RTS message to its next hop ship (SI = 2) in the routing list after checking the channel status to send data. If the channel condition is not available, wait for the delay and try again. The neighboring vessels receiving the RTS message are set to the standby mode for the delay time of 'FMT = data' by checking the header information M, N (N = H = 3) of the (SI = 6) RTS message. When the ship with SI = 2 receives the RTS message and sends a CTS message, the sending ship checks the channel status and transmits data if available.

For ARQ, a ship with SI = 2 performs an error check of the data and, if an error is detected, checks the channel state and then transmits an RTS message for NACK transmission to the transmitting ship. If neighboring ships have received an RTS-CTS message to send (SI = 6) NACK, it sets a delay time of 'FMT = NACK'. If no error is detected, the ship with SI = 2 sends an RTS message to the next hop ship in the routing list after checking (SI = 3) channel status, and the sending ship (SI = 1) one hop) ACK. Ships with SI = 2 send an RTS message by reducing N (N = 2) by one when sending an RTS message. This is to reduce the delay time by the (SI = 6) RTS message of the neighboring vessel. In this way, the data sent by the sending vessel finally arrives at the receiving vessel via the RTS-CTS message exchange.

FIG. 5 is a block diagram illustrating an ad hoc communication node performed in a node for a network between maritime mobiles according to an embodiment of the present invention. An ad hoc communication node according to an embodiment of the present invention will be described with reference to FIG. 5. The same content as the ad hoc communication method performed in a node for a network between marine mobile apparatuses according to an embodiment of the present invention described above is replaced with the above description.

The node according to an embodiment of the present invention includes a communication mode setting unit 100, a communication control setting unit 200, and a message transmitting and receiving unit 300.

The communication mode setting unit 100 sets a communication mode for transmitting and receiving a message based on whether other nodes exist around the node and available channel conditions of the node. The communication mode setting unit 100 according to an embodiment of the present invention includes a carrier detecting unit 110, a node identifier data storage unit 130, and a transmission / reception mode setting unit 150.

The carrier detector 110 detects a carrier including information on whether there is another node around the node.

The node identifier data storage unit 130 stores node identifier (ID) data included in the detected carrier.

The transmission / reception mode setting unit 150 sets a mode for transmitting / receiving a message to a node having a node identifier based on an available channel condition of the node. According to an embodiment of the present invention, the transmission / reception mode setting unit 150 includes a standby mode setting unit, a frequency communication mode setting unit, and an ad hoc communication mode setting unit.

If there is no available channel of the node, the standby mode setting unit determines the preset delay time and sets the standby mode according to the determined delay time.

The frequency communication mode setting unit sets the frequency communication mode when there is an available channel of the node but no other node around the node exists.

The ad hoc communication mode setting unit sets the ad hoc communication mode when there is an available channel of the node and there are no other nodes around the node.

The communication control setting unit 200 is configured to transmit and receive a message based on the reception target information included in the message and the type of the message. According to an embodiment of the present invention, the communication control setting unit 200 includes a communication activator 210 and a communication deactivator 230.

When a node is included in the reception target information, the communication activator 210 sets a channel for transmitting and receiving a message, and sets a node located close to the node as a transmission / reception target based on the reception target information.

If the node is not included in the reception target information, the communication deactivator 230 discards the message and sets a delay time based on the type of the message. According to an embodiment of the present invention, the communication deactivator 230 extracts the type of the additional message included in the message information and sets a delay time based on the extracted additional message type. For example, if the additional message type is an RREP message, the delay time is set based on the hop number of the routing path included in the header of the received message. As another example, when the type of the additional message is a data type or NACK, the delay time is set based on the number of data packets of the message and the number of remaining hops between the transmitting node and the receiving node.

The message transmitting and receiving unit 300 transmits and receives a message according to the set communication mode and communication control settings.

Embodiments of the present invention can be written in a computer program. The code and code segments that make up this computer program can be easily deduced by a computer programmer in the field. In addition, the computer program is stored in a computer readable medium (Computer Readable Media), and the embodiment is implemented by being read and executed by a computer. The information storage medium includes a magnetic recording medium, an optical recording medium and a carrier wave medium.

The present invention has been described above with reference to preferred embodiments. It will be understood by those skilled in the art that the present invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof. Therefore, the above-described embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown not in the above description but in the claims, and all differences within the scope should be construed as being included in the present invention.

Claims (14)

In the ad hoc communication method performed in a node for a network between maritime mobiles,
Setting a communication mode for transmitting and receiving a message based on whether another node exists around the node and an available channel condition of the node;
A communication control setting step of setting a transmission / reception target for transmitting and receiving the message or setting a delay time based on the reception target information included in the message and the type of the message;
And transmitting and receiving a message according to the set communication mode and communication control setting step.
The communication control setting step
Setting a channel for transmitting / receiving a message when the node is included in the reception target information, and setting a node located close to the node as a transmission / reception target based on the reception target information; And
If the node is not included in the reception target information, discarding the message and setting a delay time based on the type of the message. delete The method of claim 1, wherein the setting of the delay time
And extracting a type of an additional message included in the message information and setting a delay time based on the extracted additional message type. 4. The method of claim 3, wherein the additional message type is a RREP message.
And setting a delay time based on the number of hops in the routing path included in the header of the received message. The method of claim 3, wherein the type of the additional message is a data type or a NACK.
And setting a delay time based on the number of data packets of the message and the number of remaining hops between a transmitting node and a receiving node. The method of claim 1, wherein the setting of the communication mode
Detecting a carrier including information on whether there is another node around the node;
Storing node identifier (ID) data included in the detected carrier; And
Setting a mode for transmitting and receiving a message for a node having the node identifier based on an available channel condition of the node. The method of claim 6, wherein the setting of the mode comprises:
If there is no available channel of the node, determining a preset delay time and setting the standby mode to wait according to the determined delay time;
Setting to a frequency communication mode when there is an available channel of the node but no other node around the node exists; And
And setting an ad hoc communication mode when there is an available channel of the node and no other node around the node exists. In an ad hoc communication node for a network between maritime mobiles,
A communication mode setting unit configured to set a communication mode for transmitting and receiving messages based on whether another node exists around the node and available channel conditions of the node;
A communication control setting unit configured to transmit and receive the message based on the reception target information included in the message and the type of the message;
A message transmitting / receiving unit which transmits and receives a message according to the set communication mode and communication control setting,
The communication control setting unit
A communication activator configured to set a channel for transmitting and receiving a message when the node is included in the reception target information, and set a node located close to the node as a transmission / reception target based on the reception target information; And
And a communication deactivator configured to discard the message and set a delay time based on the type of the message when the node is not included in the reception target information. delete The method of claim 8, wherein the communication deactivator
And extracting a type of an additional message included in the message information and setting a delay time based on the extracted additional message type. 11. The method of claim 10, wherein the additional message type is a RREP message.
And setting a delay time based on the number of hops in the routing path included in the header of the received message. The method of claim 10, wherein the type of the additional message is a data type or a NACK.
And a delay time is set based on the number of data packets of the message and the number of remaining hops between a transmitting node and a receiving node. The method of claim 8, wherein the communication mode setting unit
A carrier detecting unit detecting a carrier including information on whether another node exists around the node;
A node identifier (ID) data storage unit for storing node identifier (ID) data included in the detected carrier; And
And a transmission / reception mode setting unit configured to set a mode for transmitting / receiving a message to a node having the node identifier based on an available channel condition of the node. The method of claim 13, wherein the transmission and reception mode setting unit
A standby mode setting unit configured to determine a preset delay time when the available channel of the node does not exist, and set to wait according to the determined delay time;
A frequency communication mode setting unit configured to set a frequency communication mode when there is an available channel of the node but no other node around the node exists; And
And an ad hoc communication mode setting unit configured to set an ad hoc communication mode when there is an available channel of the node and there is no other node around the node.

Images