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Wireless sensor network system

  • US 9,398,485 B2
  • Filed: 05/28/2012
  • Issued: 07/19/2016
  • Est. Priority Date: 09/02/2011
  • Status: Active Grant
First Claim
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1. A wireless sensor network system comprising:

  • a plurality of sensor terminals, each of which includes a sensor and conducts wireless communication; and

    a management terminal operable to construct a communication route communicates with the sensor terminals and conduct wireless communication with each of the sensor terminals based on the communication route, the sensor terminals and the management terminal serving as nodes,wherein when an additional sensor terminal participates in the network, the additional sensor terminal transmits a join request to the management terminal via existing nodes at first transmission power,wherein when the management terminal receives the join request, the management terminal calculates both a number of hops of the additional sensor terminal and a traffic load of one or more nodes on a route through which the join request has been received, determines the route as the communication route of the additional sensor terminal if both the number of hops and the traffic load are within their respective permissible ranges, and reconstructs the communication route of the additional sensor terminal by outputting an instruction to the additional sensor terminal to make direct connection to the management terminal or a specific node having a low traffic load at a second transmission power higher than the first transmission power if at least one of the number of hops and the traffic load is out of the permissible ranges,wherein when the additional sensor terminal receives the instruction, the additional sensor terminal transmits data to the management terminal by connecting to the management terminal directly or via the specific node at the second transmission power, andwherein, if the additional sensor terminal, which has received the instruction to make direct connection to the management terminal or the specific node having the low traffic load at the second transmission power, is not available for the second transmission power, the management terminal reconstructs the communication route by outputting an instruction to another sensor terminal, which is connected to the additional sensor terminal as a subordinate thereof and capable of outputting at the second transmission power, to make connection to the management terminal or the specific node at the second transmission power.

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