KR101665260B1 - Method and apparatus for transmitting data in wireless network - Google Patents

Abstract

A method and apparatus for transmitting data in a wireless network are provided. A method for transmitting a same data message to a plurality of destination nodes in a multi-hop wireless network according to an exemplary embodiment of the present invention includes the steps of: (a) Transmitting a message to the destination node, (b) transmitting to the destination node a function for allowing the destination node to determine whether to operate as a relay node, and (c) transmitting the data message to the destination node, The function is determined according to a current data transmission environment among a plurality of functions existing in each data transmission environment, and the destination node determines whether to operate as a relay node by using the function.

Description

[0001] METHOD AND APPARATUS FOR TRANSMITTING DATA IN WIRELESS NETWORK [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for transmitting data in a wireless network, and more particularly to a method of transmitting a same data message to a plurality of destination nodes in a multi- And apparatus.

The blind flooding technique is a technique in which a plurality of destination nodes relays the message to all destination nodes that have successfully received the message of the source node in order to share information generated at the source node. IEEE 802.15.4 or the like.

However, this technique has a disadvantage in that unnecessary redundant retransmissions are increased in the same area as the number of destination nodes increases, and there is a problem that the transmission power and processing power at the destination node are wasted.

Therefore, in order to reduce redundant retransmission of blind flooding in high density wireless multicast networks, area - based flooding scheme and neighbor node information - based flooding scheme have been proposed.

However, these techniques increase the data message delivery time and decrease the transmission rate due to the channel access delay time of the relay nodes and the increase of the control message exchange for acquiring information of the neighboring nodes. Therefore, There is a problem in that it is difficult to transmit.

SUMMARY OF THE INVENTION The present invention provides a method for easily delivering a data message sensitive to propagation delay time, such as video streaming, in a high-density, low-power network in which the node density is high and node power is limited I want to.

In order to achieve the above object, a method for a source node in a multi-hop wireless network to transmit the same data message to a plurality of destination nodes comprises the steps of: (a) Transmitting a function to the destination node to determine whether to send the request to the destination node; And (b) transmitting a data message to the destination node, wherein the function is determined according to a current data transmission environment among a plurality of functions existing for each data transmission environment, and the destination node uses the function There is provided a data transmission method for determining whether to operate as a relay node by itself.

When energy efficient transmission is important, the function is a function that decreases the probability of operating as a relay node according to the received signal-to-noise ratio. The function is determined based on the maximum value of the received signal-to-noise ratio for operating as a relay node and the total transmission power allowed.

When the message delivery probability and the network connectivity are important, the function is a function for determining whether to operate as a relay node based on the relay node operation probability in a specific received signal-to-noise ratio interval.

When the received signal-to-noise ratio of the destination node is within a range larger than a minimum received signal-to-noise ratio allowed to operate as a relay node and smaller than a maximum received signal-to-noise ratio, the function determines whether to operate based on the predetermined relay node operation probability value And is set to not operate as a relay node when it exists in another area.

The step (a) transmits a message about time synchronization together with the function.

According to another aspect of the present invention, a method for a destination node in a multi-hop wireless network to transmit a data message received from a source node as a relay node comprises the steps of: (a) Obtaining a parameter value of the function when a function to determine whether to operate is received; (b) determining whether to operate as the relay node based on the parameter value of the function; And (c) concurrently transmitting a data message received from the source node to a destination node located in a subsequent hop region, when it is determined to operate as the relay node.

According to another aspect of the present invention, a source node that transmits the same data message to a plurality of destination nodes in a multi-hop wireless network determines whether the destination node operates as a relay node Determining a function to be transmitted to the destination node; And a data transmission unit for transmitting a data message to the target node, wherein the function is determined according to a current data transmission environment among a plurality of functions existing for each data transmission environment, And determines whether to operate as a node.

According to another aspect of the present invention, a destination node that transmits a data message received from a source node in a multi-hop wireless network as a relay node determines whether to act as a relay node from the source node A parameter collecting unit for acquiring a parameter value of the function when the function is received; A relay node operation determining unit for determining whether to operate as the relay node based on a parameter value of the function; And a data transmission unit for simultaneously transmitting a data message received from the source node to a destination node located in a subsequent hop region, when it is determined to operate as the relay node.

According to an embodiment of the present invention, a data message sensitive to propagation delay time can be easily transmitted, such as video streaming, in a high-density, low-power network in which the node density is high and the node power is limited.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a diagram illustrating a configuration of a system for transmitting data in a wireless network according to an embodiment of the present invention.
2 is a block diagram illustrating a configuration of a source node according to an embodiment of the present invention.
3 is a block diagram illustrating a configuration of a destination node according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of a source node according to an embodiment of the present invention.
5 is a flowchart illustrating a process in which a destination node operates as a relay node according to an embodiment of the present invention.
6 is a diagram illustrating an example of a relay node operating function according to an embodiment of the present invention.
FIG. 7 illustrates another example of a relay node operating function according to an embodiment of the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" .

Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a system for transmitting data in a wireless network according to an embodiment of the present invention.

The system 100 for transmitting data in a multi-hop wireless network according to an embodiment of the present invention may include a source node 110 and a plurality of destination nodes 120.

In the present invention, the source node 110 is at the center and the location of the destination node 120 is uniformly distributed around the source node 110, and the data of the source node 110 is relayed A wireless network is assumed.

The source node 110 may be defined as a node that generates data and transmits data to the destination node 120 and the destination node 120 is defined as a node that should receive the same data from the source node 110 .

For reference, data generated at the source node 110 can be divided into encoded packets, and each packet can be relayed from the source node 110 to the destination node 120 in a multi-hop manner.

At this time, the destination nodes 120 located in the n-th hop region among the number of multi-hop N determined by the source node 110 can be classified into the same destination group (hereinafter referred to as the 'nth destination group).

In order for the data generated in the source node 110 to be transmitted to all the destination nodes 120 in the network, one or more nodes are required to operate as a relay node for each destination node group.

In addition, when the relay node is determined, it is necessary to synchronize the time for the relay nodes to simultaneously transmit the data message at the slot start time.

To this end, the source node 110 transmits a message for time synchronization (hereinafter, referred to as 'time synchronization message') and a 'function' for determining whether the destination node 120 operates as a relay node 'Relay node operation function') to the first destination node group located in the first hop region.

Also, the nodes of the first destination node group transmit the message for time synchronization and the relay node operation function to the second destination node group.

In the same manner, the nodes of the (N-1) th node group transmit the message for time synchronization and the relay node operation function to the Nth destination node group, so that all the destination nodes in the network receive the time synchronization message and the relay node operation function .

Here, the 'relay node operation function' may exist for each 'data transmission environment' including at least one of the network situation, the network operation purpose, and the characteristics of the data to be transmitted.

A detailed description of the relay node operation function will be given later with reference to a separate drawing.

The source node 110 may determine a relay node operation function suitable for the current data transmission status among the various relay node operation functions that exist according to the data transmission situation and transmit the determination result to the first destination node group.

The nodes of the first destination node group can determine whether to operate as a relay node based on the relay node operation function received from the source node 110. [ In addition, the nodes of the second destination node group can also determine whether to operate as a relay node based on the relay node operation function received from the nodes of the first destination node group.

Meanwhile, although not described above, the source node 110 may determine the transmission power in advance and transmit the determined transmission power information together with the time synchronization message and the relay node operation function.

Time synchronization is performed through a message for time synchronization and a data message is transmitted when a node to be operated as a relay node is determined through a relay node operation function. The source node 110 may send a data message to the first destination node group and the nodes of the first destination node group acting as relay nodes may simultaneously transmit data messages to the second destination node group at the synchronized slot start time have.

In this way, a data message may be transmitted from the source node 110 to the nodes of the Nth destination node group

At this time, the nodes operating as the relay node transmit the data message by the transmission power predetermined by the source node 110.

In FIG. 1, a node belonging to a first destination node group is denoted by '1', a node acting as a relay node thereof is denoted by 'A', a node belonging to a second destination node group is denoted by '2' And the node belonging to the destination node group 3 is denoted by " 3 ".

2 is a block diagram illustrating a configuration of a source node according to an embodiment of the present invention.

The source node 110 according to an embodiment of the present invention includes an information collecting unit 111, a sensor data analyzing unit 112, a data transmission environment analyzing unit 113, a function determining unit 114, a control message transmitting unit 115 And a data transmission unit 116. [

The information collecting unit 111 may include sensors such as a camera, a microphone, and an accelerometer, and collects image information, audio information, and operation information of objects using various sensors.

The information collected by the information collection unit 111 is analyzed by the sensor data analysis unit 112. The sensor data analyzing unit 112 performs information processing for extracting useful information among the information collected by the information collecting unit.

The data transmission environment analyzing unit 113 analyzes the network conditions (for example, the density of the nodes), the operating characteristics of the network (for example, increasing the message delivery success rate takes priority over reducing the power consumption of the node) The data transmission environment including one or more of the characteristics of the data to be transmitted is analyzed and the parameter values necessary for the multi-hop transmission such as the message transmission distance, the message transmission delay time, the maximum allowable maximum number of multiple hops, the transmission power, Can be determined.

The data transmission environment analyzing unit 113 can determine an appropriate communication technique for transmitting a message in consideration of the network status, operational characteristics, data characteristics to be transmitted, and the terminal. Examples of communication technologies include Bluetooth, Wi-Fi, and ZigBee.

The function determination unit 114 can determine a relay node operation function suitable for the current data transmission environment analyzed by the data transmission environment analysis unit 111. [

Here, 'relay node operation function' may exist for each of the 'data transmission environments', and each relay node operation functions may include at least one of the strength of the received signal, the range of the received signal to noise ratio, As shown in FIG.

For example, when the current data transmission environment is more important than the message transmission success rate, the relay node operation function A, when the current data transmission environment is more important than the node power reduction, A relay node operation function C, and a relay node operation function G when the current data transmission environment has high density of nodes and the power reduction of nodes is important, respectively.

For reference, some of the parameters of the relay node operation function may be set to values determined by the data transmission environment analysis unit 113, and some may be collected by the destination node 120 receiving the relay node operation function have.

For example, a value determined by the data transmission environment analyzer 113 may be set to a threshold of a received signal-to-noise ratio, a probability of operating as a relay node, and the like, The destination node 120 can acquire the destination address.

The function determination unit 114 determines a relay node operation function (matched) suitable for the current data transmission environment among the relay node operation functions existing for various data transmission environments.

The control message transmission unit 115 transmits the control message necessary for time synchronization between the source node and the destination nodes and the relay node operation function destination node 120 determined by the function determination unit 114.

The data transmission unit 116 transmits the data to the lower-level destination nodes after the relay node is determined and the synchronization of the destination nodes is made.

FIG. 6 is a diagram illustrating an example of a relay node operation function according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating an example of a relay node operation function according to an embodiment of the present invention. Fig. 8 is a diagram showing another example of the operation function.

6 and 7, the relay node operation function is a function having SNR as a variable.

The relay node operation function as shown in FIG. 6 is a function for determining whether to operate as a relay node based on a relay node operation probability in a specific received signal-to-noise ratio interval.

6 is a function for decreasing the value according to the SNR, and the relay node operation function shown in FIG. 6 is a function for increasing the probability that a destination node located far from the transmission node operates as a relay node .

The relay node operation function as shown in FIG. 6 can be selected when the energy efficient transmission is more important than the message delivery failure probability.

The relay node operation function shown in FIG. 6 can be defined as the following equation (1).

가

보다 작은 노드들은 수신 신호 대 잡음비에 관한 중계 노드 동작 함수

로 중계 확률을 산출하고, 그 값을 중계 노드로 동작할지 여부를 결정하기 위한 확률

로 설정한다. 예를 들어,

가 0.5일 경우 목적 노드는 50%의 확률로 중계 노드로 동작하게 된다.Received signal-to-noise ratio

end

The smaller nodes are the relay node operation function for the received signal-to-noise ratio

And calculates the probability for determining whether to operate as a relay node

. E.g,

Is 0.5, the destination node operates as a relay node with a probability of 50%.

는 중계 노드로 동작하기 위한 수신 신호대 잡음비(SNR)의 최대값이고,

는 허용되는 총 송신 전력 등으로 결정된다. In the above equation,

Is the maximum value of the received signal-to-noise ratio (SNR) for operating as a relay node,

Is determined by an allowable total transmission power or the like.

를 감소시킬 경우 송신 노드로부터 가까운 곳에 위치한 노드가 중계 노드로 동작하는 것을 제한할 수 있어 중복 재전송 및 송신 에너지 낭비를 감소시킬 수 있게 된다. In the above equation,

It is possible to restrict a node located near the transmitting node from operating as a relay node, thereby reducing redundant retransmissions and waste of transmission energy.

를 증가시키게 될 경우 중계 노드 중 송신 노드로부터 먼 곳에 위치한 노드의 비율을 증가시킬 수 있게 되어 송신 에너지 효율 및 메시지 전달 거리를 증가시킬 수 있게 된다. Also,

It is possible to increase the ratio of nodes located far from the transmitting node among the relay nodes, thereby increasing the transmission energy efficiency and the message transmission distance.

The relay node operation function as shown in FIG. 7 is a function for determining whether to operate as a relay node based on a relay node operation probability in a specific received signal-to-noise ratio interval.

및

이며, 상한 및 하한값은 네트워크 환경 등을 고려하여 소스 노드에서 설정될 수 있으며 신호대 잡음비는

의 범위로 정해진다. 수신 신호대 잡음비 조건은 중계 노드로 동작할 수 있는 조건 중 하나이며, 이와 같이 수신 신호 대 잡음비의 상한 및 하한을 설정하는 것은 i번째 홉에서 목표 영역 내의 목적지 노드들의 수신 신호대 잡음비의 확률 분포가 일정하게 유지되도록 하기 위해서이다. In this case, the upper limit value and the lower limit value of the received signal-to-noise ratio are determined. The upper and lower limits of the received signal-to-

And

And the upper and lower limit values can be set in the source node in consideration of the network environment and the like, and the signal-to-

. ≪ / RTI > The condition of the received signal-to-noise ratio is one of the conditions that can operate as a relay node. Setting the upper and lower limits of the received signal-to-noise ratio in this manner means that the probability distribution of the received signal- To be maintained.

The relay node operation function as shown in FIG. 7 will be able to select the message delivery failure probability and network connectivity in a network that is more important than energy efficient transmission.

가 설정된다. 예를 들어,

가 0.5일 경우 목적 노드는 50%의 확률로 중계 노드로 동작하게 된다. In the relay node operation function as shown in FIG. 7, the probability of operating as a relay node to determine whether to operate as a relay node

Is set. E.g,

Is 0.5, the destination node operates as a relay node with a probability of 50%.

7, when the received SNR of the destination node is greater than the minimum SNR allowed to operate as a relay node and is within a range smaller than the maximum SNR, the relay node operating function shown in FIG. Determines whether to operate based on the operation probability value, and is set to not operate as a relay node when it exists in another area.

The relay node operation function as shown in FIG. 7 may be expressed by the following equation (2).

의 범위 내에 있을 경우 해당 목적 노드는

의 확률로 중계 노드로 동작하게 된다. 그러나 수신 신호대 잡음비가 위 범위에 있지 않을 경우 목적 노드는 중계 노드로 동작하지 않게 된다. If the received signal-to-noise ratio

, Then the corresponding destination node

As a relay node. However, if the received SNR is not in the upper range, the destination node does not operate as a relay node.

의 값을 크게 설정할 수 있다. In addition, if the current data transmission environment places more importance on the message delivery success rate than the power reduction of the node (i. E., If the reliability for message delivery is a priority)

Can be set to a large value.

3 is a block diagram illustrating a configuration of a destination node according to an embodiment of the present invention.

The destination node 120 according to an embodiment of the present invention includes a time synchronization unit 121, a parameter collection unit 122, a relay node operation determination unit 123, a data message processing unit 124, a control message transmission unit 125, And a data transmission unit 126.

The time synchronization unit 121 synchronizes with the nodes belonging to the same destination node group at the slot start time according to the control message for time synchronization received from the source node 110 or the higher destination node Can be performed.

When the relay node operation function is received from the source node 110, the parameter collection unit 122 may collect parameters of the relay node operation function to determine whether to operate as a relay node.

The parameter collecting unit 122 acquires a parameter (for example, a received signal strength, etc.) of the parameters of the relay node operation function that should be collected by the destination node and a value for determining whether to operate as a relay node (for example, The received signal-to-noise ratio) can be calculated.

On the other hand, the relay node operation determining unit 123 can determine whether to operate as a relay node based on the parameter value of the relay node operation function and the received signal-to-noise ratio calculated by the parameter collecting unit 122. [

The control message transmission unit 125 transmits a control message and a relay node operation function necessary for time synchronization to a lower node.

The data transmission unit 126 transmits the data to the lower-level destination nodes after the time synchronization of the destination nodes is performed if the relay node is determined.

The data message can be transmitted to the destination nodes (destination node group) located in the subsequent hop region (the (n + 1) th hop region when the hop region of the destination node group to which it belongs is the nth hop region).

4 is a flowchart illustrating an operation of a source node according to an embodiment of the present invention.

The source node 110 analyzes the current data transmission environment and determines parameter values necessary for data transmission (S401).

After S401, the source node 110 determines a relay node operation function suitable for the current data transmission environment (S402).

For example, the 'relay node operation function' may exist for each 'data transmission environment', and each relay node operation function may include at least one of the strength of the received signal, the range of the received signal to noise ratio, .

As described above, when energy-efficient transmission is important, the data transmission environment can be determined as a relay node operation function whose size decreases according to the received signal-to-noise ratio.

In addition, if transmission reliability is important, a function may be selected to determine whether to operate as a relay node based on a relay node operation probability in a specific received signal-to-noise ratio interval.

After step S402, the source node 110 transmits a control message including a time synchronization message and a determined relay node operation function to a first destination node group, which is a set of destination nodes located in a first hop region (S403).

For reference, the destination nodes belonging to the first destination node group can transmit the control message including the time synchronization message and the relay node operation function to the second destination node group, which is a set of destination nodes located in the second hop region, The destination nodes in the destination node group can transmit the control message including the time synchronization message and the relay node operation function to the third destination node group which is a set of destination nodes located in the third hop region.

If the determined number of multi-hop is N, the control message including the time synchronization message and the relay node operation function can be transmitted to the final destination node belonging to the Nth destination node group in this manner.

After S403, the source node 110 transmits a data message to the first destination node group (S404). The data message is transmitted after the control message is transmitted to the node of the last hop and time synchronization is performed.

For reference, nodes operating as a relay node in a first destination node group can concurrently transmit a received data message to a second destination node group at a synchronized slot start time, and a node operating as a relay node in a second destination node group May simultaneously transmit a received data message to a third destination node group at a synchronized slot start time.

5 is a flowchart illustrating a process in which a destination node operates as a relay node according to an embodiment of the present invention.

The destination node 120 determines whether the reception intensity of the signal sensed by the connected channel is greater than a predetermined threshold (S500). If the strength of the received signal is not greater than a predetermined threshold, the received signal is ignored.

The destination node checks whether the message is successfully received by performing a Cyclic Redundancy Code (CRC) check of the received signal (S501).

For reference, the received message may be a message related to the relay node operation function and time synchronization.

If the message fails to be received, the destination node 120 may continuously perform an attempt to receive the signal at the next hop.

If the message is successfully received, the destination node 120 obtains the parameter value of the relay node operation function to determine whether to operate as a relay node (S502).

At this time, the destination node 120 may acquire parameters (for example, the received signal-to-noise ratio) that the destination node 120 should collect among the parameters of the relay node operation function.

The destination node 120 determines whether to operate as a relay node based on the acquired parameters and the transmitted relay node operation function (S503).

If it is determined to operate as a relay node, the destination node 120 simultaneously transmits data messages received from the source node 110 and nodes belonging to the same destination node group at the synchronized slot start time (S504).

When the data message transmission is performed, the destination node 120 acting as the relay node can delete the corresponding data message from the memory, and the destination nodes 120 determined not to act as the relay node transmit the received relay node operation function Related messages can be deleted from memory.

For reference, the reason why the destination node can delete the message in the memory according to the embodiment of the present invention is that a destination node other than the destination node group can transmit the message in the same destination node group.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (22)

A method for a source node in a multi-hop wireless network to transmit the same data message to a plurality of destination nodes,
(a) transmitting to the destination node a function for determining whether the destination node operates as a relay node; And
(b) transmitting a data message to the destination node
, ≪ / RTI &
Wherein the function is determined according to a current data transmission environment among a plurality of functions existing for each data transmission environment, and the destination node determines whether to operate as a relay node by using the function. The method according to claim 1,
Wherein if the energy efficient transmission is important, the function is a function that decreases the probability of operating as a relay node according to a received signal to noise ratio. 3. The method of claim 2,
Wherein the function is determined based on a maximum value of a received signal to noise ratio and an allowable total transmission power for operating as a relay node. The method according to claim 1,
Wherein the function is a function for determining whether to operate as a relay node based on a relay node operation probability in a specific received signal-to-noise ratio interval when message transmission probability and network connectivity are important. 5. The method of claim 4,
When the received signal-to-noise ratio of the destination node is within a range larger than a minimum received signal-to-noise ratio allowed to operate as a relay node and smaller than a maximum received signal-to-noise ratio, the function determines whether to operate based on the predetermined relay node operation probability value And is a function set to not operate as a relay node when it exists in another area. The method according to claim 1,
Wherein the step (a) transmits a message for time synchronization together with the function. A method for a destination node in a multihop wireless network to transmit a data message received from a source node as a relay node,
(a) acquiring a parameter value of the function when receiving a function for determining whether to operate as a relay node from the source node;
(b) determining whether to operate as the relay node based on the parameter value of the function; And
(c) concurrently transmitting a data message received from the source node to a destination node located in a subsequent hop region when it is determined to operate as the relay node
And transmitting the data. 8. The method of claim 7,
Wherein if the energy efficient transmission is important, the function is a function that decreases the probability of operating as a relay node according to a received signal to noise ratio. 9. The method of claim 8,
Wherein the function is determined based on a maximum value of a received signal to noise ratio and an allowable total transmission power for operating as a relay node. 10. The method of claim 9,
Wherein the function is a function for determining whether to operate as a relay node based on a relay node operation probability in a specific received signal-to-noise ratio interval when message transmission probability and network connectivity are important. 11. The method of claim 10,
When the received signal-to-noise ratio of the destination node is within a range larger than a minimum received signal-to-noise ratio allowed to operate as a relay node and smaller than a maximum received signal-to-noise ratio, the function determines whether to operate based on the predetermined relay node operation probability value And is a function set to not operate as a relay node when it exists in another area. 12. The method of claim 11,
Wherein the step (a) receives information about time synchronization together with the function. A data transmission apparatus for transmitting the same data message to a plurality of destination nodes in a multi-hop wireless network,
A function determining unit for determining a function for determining whether the destination node operates as a relay node and transmitting the determined function to the destination node; And
A data transmission unit for transmitting a data message to the target node,
, ≪ / RTI &
Wherein the function is determined according to a current data transmission environment among a plurality of functions existing for each data transmission environment, and the destination node determines whether to operate as a relay node by using the function. 14. The method of claim 13,
Wherein when the energy efficient transmission is important, the function is a function that decreases the probability of operating as a relay node according to a received signal-to-noise ratio. 15. The method of claim 14,
Wherein the function is determined based on a maximum value of a received signal-to-noise ratio and an allowable total transmission power for operating as a relay node. 14. The method of claim 13,
Wherein the function is a function for determining whether to operate as a relay node based on a relay node operation probability in a specific received signal to noise ratio interval when message transmission probability and network connectivity are important. 17. The method of claim 16,
When the received signal-to-noise ratio of the destination node is within a range larger than a minimum received signal-to-noise ratio allowed to operate as a relay node and smaller than a maximum received signal-to-noise ratio, the function determines whether to operate based on the predetermined relay node operation probability value And is a function set to not operate as a relay node when it exists in another area. A data transmission apparatus for transmitting a data message received from a source node in a multi-hop wireless network as a relay node,
A parameter collecting unit for acquiring a parameter value of the function when receiving a function for determining whether to operate as a relay node from the source node;
A relay node operation determining unit for determining whether to operate as the relay node based on a parameter value of the function; And
A data transmission unit for simultaneously transmitting a data message received from the source node to a destination node located in a subsequent hop region,
Wherein the data transmission apparatus comprises: 19. The method of claim 18,
Wherein when the energy efficient transmission is important, the function is a function that decreases the probability of operating as a relay node according to a received signal-to-noise ratio. 20. The method of claim 19,
Wherein the function is determined based on a maximum value of a received signal-to-noise ratio and an allowable total transmission power for operating as a relay node. 19. The method of claim 18,
Wherein the function is a function for determining whether to operate as a relay node based on a relay node operation probability in a specific received signal to noise ratio interval when message transmission probability and network connectivity are important. 22. The method of claim 21,
When the received signal-to-noise ratio of the destination node is within a range larger than a minimum received signal-to-noise ratio allowed to operate as a relay node and smaller than a maximum received signal-to-noise ratio, the function determines whether to operate based on the predetermined relay node operation probability value And is a function set to not operate as a relay node when it exists in another area.

Images