KR101047119B1 - Sensor network simulation system that works with sensor node emulator - Google Patents

Abstract

According to the present invention, a sensor network simulation system interworking with a sensor node emulator performs sensor network simulation for a space in which a large number of sensor nodes are integrated, while a sensor node code is required for a sensor node requiring a separate emulation. Make sure that the operation status is clearly verified. To this end, the present invention, a sensor node emulator for simulating a command for the sensor node to be emulated to obtain a result value, and obtains the result value through the sensor node emulator, the sensor network by referring to the result value It includes a sensor network simulator that simulates the entire sensor node.

Sensor network, sensor network simulator, sensor node emulator

Description

Apparatus for sensor network simulation with linking to sensor node emulator}

The present invention improves the accuracy of the existing sensor network simulation in the sensor network simulation for the purpose of analyzing the data transmission and reception performance between large sensor nodes, and verifies the operation of the source code for the sensor node generated based on the network simulation close to the actual situation. The present invention relates to a sensor network simulation system incorporating a sensor node emulator.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task Management No .: 2008-S-023-01, Task Name: Development of Nano Qplus based sensor network simulator] ].

The sensor network system locates sensors in areas for detecting changes in buildings, living things, and the environment, and performs wired and wireless communication with the deployed sensors to determine changes in buildings, living things, and the environment, and take action based on the judgment result. Means a network system that allows

The sensor network system is located where a large number of sensor nodes need to detect environmental changes, so when the size of a building increases or the number of objects to be detected increases, the number of sensor nodes required increases exponentially.

Therefore, as the sensor network system is configured on a large scale, the sensor network system to be configured is simulated in advance by emulating the communication status, the communication speed, and the sensor nodes between the sensor nodes, thereby designing time for the sensor network system. Can be reduced.

The sensor network simulation method is basically based on simulation of data communication possibility and communication speed between sensor nodes capable of wired or wireless network communication.

Therefore, conventionally, the existing wired / wireless network simulation technology is applied to the sensor network field and applied to the sensor network simulation.

The conventional sensor network simulation method focuses on analyzing the communication performance of the entire network consisting of large sensor nodes, rather than obtaining accurate state information for each sensor node constituting the network. , And operating conditions and the like cannot be analyzed.

In addition, since it is based on the simulation method of the existing wired and wireless network system, it is not possible to verify the operation state of the source code operating in the sensor node.

For this drawback, a sensor network simulation method that emulates sensor nodes has been proposed.

The sensor network simulation method of emulating sensor nodes performs emulation for each sensor node constituting the sensor network system. In this case, it is possible not only to verify the operation state of the source code driven by the sensor node, but also to verify the entire sensor network based on accurate information on the operation state of the source code. However, the method of emulating sensor nodes has to perform emulation for all sensor nodes, so that if the number of sensor nodes is large, it takes a huge amount of time to simulate the entire sensor network. There is a problem that is difficult to apply to the sensor network provided.

Accordingly, an object of the present invention is to simulate a sensor network system constructed with a large number of sensor nodes, and the sensor nodes requiring verification are separately emulated to reduce the simulation time for the sensor network system, as well as the accuracy of the simulation results. It is to provide a sensor network simulation system in conjunction with the sensor node emulator to increase the.

The above object is a sensor node emulator for simulating a command for at least one emulation target sensor node of a plurality of sensor nodes and obtaining a result for the simulation execution according to the present invention; And a sensor network simulator for performing simulation on the plurality of sensor nodes constituting the sensor network with reference to the result value obtained through the sensor node emulator. .

The present invention makes it possible to clearly verify the code operation of a sensor node for a sensor node that requires a separate emulation while performing a sensor network simulation for a space where a large number of sensor nodes are integrated.

In addition, source code analysis for the sensor node can be performed before installing and testing a large sensor network system, thereby reducing development time required for software development for the large sensor network system.

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

1 shows a block diagram according to an example of a sensor network simulation system incorporating a sensor node emulator according to the present invention.

The sensor network simulation system incorporating the illustrated sensor node emulator includes a sensor node emulator 110 and a sensor network simulator 120.

The sensor node emulator 110 processes an event (eg, a fire event, a singular event, and a communication event, etc.) for a sensor node that requires separate verification among a plurality of sensor nodes constituting the sensor network system. When doing so, emulation is performed on the sensor node to be verified that is associated with the location where the event occurs. The sensor node emulator 110 analyzes the source code driven by the sensor node to be verified, obtains a simulation output signal for the simulation input signal applied from the sensor node to be verified, and obtains the simulated output signal from the sensor node to be verified. Determine if the output is expected.

Preferably, sensor node emulator 110 includes MCU module 111, RF module 112, sensor module 113, and actuator module 114.

The MCU module 111 interprets machine instructions for driving the sensor node to be verified. Environmental information obtained from the sensor module 113 may be interpreted based on the machine instruction interpreted by the MCU module 111, may determine whether the actuator is driven, and may determine whether to transmit or receive the environmental information. The MCU module 111 simulates the control command or data applied to the interpreted machine command when the control command or data is applied from another node neighboring the verification target sensor node.

The RF module 112 converts the environmental information obtained from the sensor module 113 according to the communication protocol set in the sensor node to be verified. The environment information converted by the RF module 112 is simulated and transmitted to neighboring sensor nodes. At this time, the environment information or other data transmitted and received by the RF module 112 is simulated according to the machine instruction interpreted by the MCU module 111.

The actuator module 114 determines whether an appropriate simulation control signal is output toward the actuator device when there is an actuator device on which the verification target sensor node is turned on or off or controlled.

The interworking module 115 forms a simulation driving result of the MCU module 111, the RF module 112, the sensor module 113, and the actuator module 114 in a format contracted with the sensor network simulator 120, and then the sensor Provided to the network simulator 120.

The sensor network simulator 120 simulates data communication possibility and communication speed between each sensor node. Preferably, the sensor network simulator 120 includes a network simulation module 121 and a node simulation module 122.

The network simulation module 121 includes arrangement information of sensor nodes arranged in a space such as a building, and communication protocol information of each sensor node. The network simulation module 121 performs communication between neighboring nodes and performs communication. Determine the communication speed between two sensor nodes.

The network simulation module 121 determines whether communication between the two is possible by referring to the communication protocols of the two sensor nodes performing mutual communication. If communication is possible, the node simulation module 122 determines what is the data transmission speed between the two sensor nodes performing communication. The node simulation module 122 simulates an input / output signal of a sensor node.

The interworking module 123 obtains simulation driving results of individual sensor nodes transmitted from the sensor node emulator 110, and provides the obtained simulation driving results to the network simulation module or the node simulation module 122.

When the interworking module 123 provides the simulation driving result, the network simulation module 121 refers to the sensor node to be verified and the sensor node to be verified by referring to the simulation driving result of the sensor node to be verified provided by the interlocking module 123. Determine the data transmission rate and the possibility of data transmission between other sensor nodes communicating with each other.

In this case, the node simulation module 122 uses a simulation driving result for the sensor node to be verified obtained through the interworking module 123 among the plurality of sensor nodes constituting the sensor network, and for other sensor nodes itself. Simulate the input and output signals of the sensor node.

Therefore, when simulating a sensor network with a large number of sensor nodes, emulation is performed at the machine instruction level for a few sensor nodes that need to be verified, and communication and communication between each sensor node is possible for many sensor nodes that are not. Simulate speed, etc. This allows the sensor network to be simulated at high speed, emulating the specific sensor nodes desired by the developer in machine instructions to increase the accuracy of the simulation for the sensor nodes being verified and to increase the simulation speed for large sensor nodes. You can.

According to the present invention, the simulation results can be obtained by comparing two sensor node emulators 110 and sensor network simulator 120 with different functions. The source code for the test results close and similarly to the actual sensor network environment.

2 is a reference view for explaining a simulation method of a sensor node according to the present invention.

Referring to FIG. 2, the illustrated sensor network consists of nine sensor nodes, and a line connecting each sensor node represents a physical connection relationship.

Of the nine sensor nodes, sensor node 5 is an emulation target node of the sensor node emulator 110, and another sensor node (sensor node 1, sensor 2, sensor 3, sensor 4, node 6). A sensor node, a sensor node 7, a sensor node 8, and a sensor node 9 correspond to simulation targets of the sensor network simulator 120.

If it is assumed that data is transmitted from sensor node 1 to sensor node 9 after sensing the data, the developer needs a MAC and a routing protocol for simulation for each sensor node except sensor node 5. And the execution image to be executed in sensor node 5.

When the sensing data is transmitted through the sensor nodes 1, 2, 4, and 9 as a path, the network simulation module 121 and the node simulation module 122 of the sensor network simulator 120 are driven to perform the simulation.

The network simulation module 121 determines a routing path for sensor nodes 1, 2, 4, and 9 according to a routing protocol specified by the user, and the node simulation module 122 receives data received from neighboring nodes along the routing path. It processes and transmits data to other neighbor nodes along the routing path. For example, assuming that sensor 2 receives data from sensor 1 and transmits the data to sensor 4, node simulation module 122 receives data received from sensor 1 for data processing of sensor 2. It analyzes according to existing input MAC and routing protocol and delivers it to sensor node 4.

If the sensing data passes through the emulation node (Sensor No. 5), for example, when the sensing data is transmitted through nodes 1, 5, 7, and 9, the sensor network simulator 120 and the sensor node emulator ( 110 is linked to perform the simulation.

The network simulation module 121 determines routing paths for sensor nodes 1, 5, 7, and 9 according to a routing protocol specified by the user, and the node simulation module 122 determines that an adjacent sensor node is an emulation node (sensor node 5). ), The interworking module 123 is called to perform interworking with the sensor node emulator 110. For example, when the sensor node 5 receives data from the sensor node 1, the node simulation module 122 operates to process the sensor node data 1 and not directly send the sensor node data to the sensor node 5, so that the interworking module 123 receives the data. By processing the sensor node emulator 110 to process. In addition, even when data is sent from node 5 to node 7, the sensor node emulator 110 allows the data to be transmitted to the sensor node 7 through the interworking module 115.

3 is a flowchart illustrating a simulation process of a sensor network simulation system in which the sensor node emulator described with reference to FIGS. 1 and 2 is linked.

First, the sensor network simulation system incorporating the sensor node emulator initializes previous records of the node placement information of each sensor node and the connection relationship between the respective sensor nodes before performing the simulation for each sensor node ( S210).

Initialization includes the creation of physical connection relationships between sensor nodes and sensor nodes constituting the sensor network, determination of sensor nodes to emulate, creation of execution images to be performed on emulation nodes, and generation of start simulation events such as fires. Means to carry out.

When the start simulation event is started in the sensor network simulator 120 in this initialized state, a simulation related to data transmission between the sensor nodes is performed based on the start event.

In the initial stage, the basic information necessary for the simulation is set, the network simulation module 121 selects the sensor node having the fastest simulation time among the sensor nodes that receive the received data and performs emulation or node simulation.

The sensor network simulator 120 determines whether the receiving node is an emulation target sensor node (S220), and when the determination result is an emulation target sensor node, the sensor node emulator 110 emulates the corresponding sensor node to receive the received data. Process and generate the transmission data for it (S230).

If the receiving node is not an emulation node, the node simulation module 122 processes the received data for the corresponding sensor node and generates transmission data (S240). The network simulation module 121 registers such transmission data and determines and registers a transmission node by a routing path generated based on a routing protocol (S250).

The sensor network simulator 120 determines whether there is a receiving sensor node to be further interpreted (S260), and if the receiving sensor node exists as a result of the determination, the process moves to step S220 of determining the type of the receiving sensor node (S220). The process of repeating and, if the receiving sensor node does not exist, is terminated (S260).

4 is a flowchart illustrating an emulation process of a sensor network simulation system incorporating a sensor node emulator according to the present invention.

First, the interworking module 123 of the sensor network simulator receives the received data from the node simulation module 122 and converts the received data into communication data that can be recognized by the sensor node emulator 110 (S310). Communication data that can be recognized by the sensor node emulator 110 is not described in detail in this document because it depends on the actual implementation. The interworking module 123 transmits the converted data to the sensor node emulator 110. The interworking module 115 of the sensor node emulator 110 receives such data, generates a reception event in the sensor node emulator 110 (S320), and transmits data to the RF module.

The MCU module 111 receiving the reception event analyzes the machine instructions of the input execution image one by one and executes them until it arrives at the instruction for processing the received data (S330). In this process, when the sensing command is performed, the sensor module 113 is operated to emulate the process of sensing the actual data, and when the actuation command is performed, the actuation module 114 is operated to emulate the process of the actual actuation.

When the reception command is generated, the MCU module 111 transfers control to the RF module 112 and the RF module 112 processes the received data received from the interworking module 115 and passes it to the MCU module 111 ( S340). The MCU module 111 receiving the processed data performs a command for processing the corresponding data. If the received data is no longer sent to another sensor node, the received data processing is finished and the emulation is stopped, but in most cases, the received data is processed and processed, and the processed data is transmitted again to another node (S350).

5 shows a flowchart of the operation of the node simulation module 122.

First, the MCU module 111 processes the received data while performing a machine language command to create new data, and requests the generated data transmission from the RF module 112 (S410). The RF module 112 generates the transmission data processed in a form capable of transmitting the data received from the MCU module 111 and requests the simulator interworking module 123 to be transmitted to the sensor network simulator 120 (S420). ). The interworking module 123 of the sensor network simulator 120 receives such data, converts the data into data recognizable by the sensor network simulator 120, and registers the converted data and the transmission event in the network simulation module 121.

1 is a block diagram according to an example of a sensor network simulation system incorporating a sensor node emulator according to the present invention;

2 is a reference view for explaining a simulation method of a sensor node according to the present invention;

3 is a flowchart illustrating a simulation process of a sensor network simulation system in which a sensor node emulator described with reference to FIGS. 1 and 2 is linked;

4 is a flowchart illustrating an emulation process of a sensor network simulation system incorporating a sensor node emulator according to the present invention;

5 shows a flowchart of the operation of the node simulation module 122.

* Description of the symbols for the main parts of the drawings *

110: sensor node emulator 111: MCU module

112: RF module 113: sensor module

114: actuator module 115: interlock module

120: sensor network simulator 121: network simulation module

122: node simulation module 123: interworking module

Claims (7)

A sensor node emulator that simulates instructions for at least one emulation target sensor node of a plurality of sensor nodes and obtains a result for the simulation execution; And And a sensor network simulator for performing simulation on the plurality of sensor nodes constituting a sensor network by referring to the result value obtained through the sensor node emulator. The method of claim 1, The sensor node emulator is An MCU module for interpreting the instructions; A sensor module for simulating environment information on an environment around the sensor node; And And an RF module for simulating and converting an output value of the sensor node into a transmission signal for transmitting to another node. The method of claim 2, The sensor node emulator is And an actuator module for driving an actuator according to the environmental information. The method of claim 2, The sensor node emulator is And a linkage module configured to provide the result of the emulation target sensor node to the sensor network simulator in a format contracted with the sensor network simulator. The method of claim 1, The sensor network simulator, Sensor network simulation system, characterized in that for simulating the data transmission rate between the sensor nodes, and success or failure. The method of claim 1, The sensor network simulator, Sensor network simulation system, characterized in that to apply the simulation event to the space where the sensor nodes are installed to determine the response of each node to perform the simulation. The method of claim 6, The simulation event, Sensor network simulation system, characterized in that the event that changes the environment in the space.

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