| Summary: | 碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 104 === In the wireless communication network, group based system is used for energy saving, resource allocation and quality of service. In the internet of things network, we can use grouping algorithm to let the machine find the suitable coordinator by itself. We consider a hybrid system with direct transmission and group transmission and do hierarchical grouping based on the position of the devices. Each device decide if transmit data directly based on the ring pattern formulation. The devices which locate outside the ring will find the suitable coordinator by the grouping algorithm. With each devices finding the suitable transmission path, the system will get the better performance. In the thesis, each device consumes the energy which is provided by equipped battery. That means, the energy is limited, so we focus on the system energy consumption and propose the algorithm to solve the previous problem and reduce the system energy consumption. Further, the amount of the group is one of the major problems in grouping algorithm. However, the algorithm can let the system decide the exact group number by itself based on the number and distribution of devices.
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