PROBLEM TO BE SOLVED: To provide a measurement information collection system and a wireless node, capable of obtaining satisfactory throughput with improved communication quality between wireless nodes by grasping the state of radio wave hindrance to set an optimal frequency channel and a communication sequence.SOLUTION: A wireless node 2 including an upper-level wireless node 2A and a lower-level wireless node 2B further includes a control unit 10, a memory unit 11 and a communication unit 12. The wireless node 2 obtains an interference pattern stored in the memory unit 11 by the control unit 10, generates interference pattern information from the interference pattern on the basis of the obtained interference pattern, analyzes the interference pattern information to generate transmission sequence data, and determines the transmission sequence of the lower-level wireless node 2B on the basis of the transmission sequence data. Further, the wireless node 2 analyzes the interference pattern information to calculate an interference ratio. If the interference ratio exceeds a threshold, the upper-level wireless node 2A modifies a frequency channel.

Measurement information collection system, wireless node, wireless node communication method and program

The embodiment of the invention provides a method and a device for planning routing in a wireless sensor network. The method comprises the following steps: comparing the degree of an actual chain of a first wireless sensor node with a preset degree when the degree of the actual chain of the first wireless sensor node is acquired; if the degree of the actual chain of the first wireless sensor node is D-1, acquiring all routes from the first wireless sensor node to a second wireless sensor node according to a preset first rule; acquiring the weight of each route according to a preset algorithm; acquiring the route with the minimum weight of the routes, and taking the route with the minimum weight as the route from the first wireless sensor node to the second wireless sensor node, so that a point-to-point optimal data routing method on the basis of a dynamic planning method under the situation that a node degree is limited in the wireless sensor network is realized.

Method and device for planning routing in wireless sensor network

The disclosure is related to a method and a system for adjusting a communication channel based on a signal scan result. The system includes wireless gateway modules, a wireless transceiver module and a control circuit. The control circuit determines whether or not the wireless transceiver module conducts any transmission task. The wireless transceiver module is activated to scan signals over a selected frequency when it is available. Multiple scan results can be obtained when the scanning process is repeatedly conducted in different frequencies. Signal information is recorded in a signal scan table. Thus, if the system determines the frequency needs to be adjusted based on a transmission status, one of the frequencies recorded in the table can be chosen and set for the wireless gateway module and a transmission frequency for a terminal node is modified.

Method and system for adjusting communication channel based on signal scan result

To provide a communication method and a communication system for adjusting channels on the basis of scan results.SOLUTION: A communication system includes one or more radio gateway modules, at least one radio transmission/reception module, and a control circuit. The control circuit confirms whether the radio transmission/reception module is executing a transmission mission, on confirming that the radio transmission/reception module is going to be available, drives the radio transmission/reception module to scan its periphery with a selected frequency, and generates a scan result. Then, the control circuit repeats scanning the periphery with different frequencies, generates a plurality of scan results, and stores signal information therein in a signal scan table. When adjusting a transmission frequency on the basis of a transmission state, the communication system sets a frequency from the signal scan table as a transmission frequency of the radio gateway modules, furthermore updates frequency information on a terminal node, and maintains good communication quality.SELECTED DRAWING: Figure 5

Communication method and communication system for adjusting channel based on scan result

PROBLEM TO BE SOLVED: To provide a radio communication controller capable of assigning a channel efficiently to each wireless node, by optimizing the channels to be used in the whole network.SOLUTION: A radio communication controller for assigning a channel, used in radiocommunication between multiple wireless nodes, and between each wireless node and each node, to each wireless node has channel assignment system determination means for determining a prescribed channel assignment system for assigning to each wireless node, based on the node information about each wireless node acquired therefrom, from the multiple channel assignment system, and radiocommunication means performing control for transmitting the channel information of each wireless node, determined by the channel assignment system, to each wireless node.SELECTED DRAWING: Figure 1

Radio communication controller, radio communication control program, and radio communication control method

PROBLEM TO BE SOLVED: To switch a frequency to an optimal one by taking the characteristics of a sensor network system into consideration. SOLUTION: Each relay router 10 transmits to a reader 20 importance related information about the importance of sensor data collection processing to be performed personally, scans a using state of each candidate frequency around self in the entire sensor data collection processing that is performed in the entire sensor network system 1, and transmits obtained scan results to the reader 20. The reader 20 calculates priorities showing the degrees for using the candidate frequency preferentially for each candidate frequency on the basis of the importance related information and the scan results received from the relay router 10, and instructs each relay router 10 to switch to the optimal frequency selected on the basis of the priorities. COPYRIGHT: (C)2011,JPO&INPIT

Sensor network system and sensor network control method

We have developed a prototype of the hyper multi-point data gathering satellite communications (SATCOM) system that can collect various sensor data with high frequency utilization efficiency from a large number of data-sensing stations scattered over wide areas and send it to one data-gathering station in a unified way. This paper presents its technical features, as well as field trial results to evaluate its feasibility using the Japanese Engineering Test Satellite VIII. The results show that the system is very useful for collecting various sensor data having different characteristics such as frequency and data size, and sending it to the data-sensing station simultaneously and efficiently.

Field trials on hyper multi-point data gathering SATCOM system with highly efficient channel allocation scheme for sensor network

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Sensor network system and sensor network control method

Field trials on hyper multi-point data gathering SATCOM system with highly efficient channel allocation scheme for sensor network