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무선 애드혹 네트워크에서 우선순위를 고려한 분산 노드 스케줄링
이원석(WonSeok Lee),김태준(Taejoon Kim),김태홍(Taehong Kim),이재생(JaeSeang Lee),함재현(Jae-Hyun Ham) 제어로봇시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.2
Wireless networks are deployed in a variety of environments and must deliver high-priority data to a destination node as quickly as possible. For this reason, several node-scheduling algorithms have been proposed and some distributed scheduling algorithms make the load among nodes semi-equal through slot exchange. In spite of the distributed scheduling nature, they achieve similar performance with centralized scheduling schemes. However, the enhanced processing for high-priority packets has not been considered. Accordingly, this paper proposes an algorithm that uses multi-queues for the purpose of slot preemption in high-priority packets. Using a network simulator, we compared the performance of the proposed algorithm and the existing scheduling algorithm under various simulation environments in which the generation ratio of high priority packets was changed. Through the simulation, we can confirm that the proposed algorithm showed excellent performance.
김용정(Yong Jeong Kim),Linh-An Phan,김태준(Taejoon Kim),김태홍(Taehong Kim),이재생(JaeSeang Lee),함재현(Jae-Hyun Ham) 제어로봇시스템학회 2019 제어·로봇·시스템학회 논문지 Vol.25 No.12
Gradient Time Synchronization Protocol (GTSP) is a consensus-based time synchronization protocol in which each node adjusts its logical clock by averaging the relative clock rate of neighbor nodes in every beacon interval. This process is repeated until the network achieves convergence of time synchronization. Therefore, a short beacon interval can reduce the convergence time, although it causes high energy consumption because messages are sent frequently. In contrast, a longer beacon interval can reduce energy consumption but may result in a longer convergence time. In this paper, we propose the Adaptive Gradient Time Synchronization Protocol (AGTSP), which enables dynamic adjustment of the beacon interval of each node in a fully-distributed manner to reduce convergence time and energy. A performance evaluation demonstrates that AGTSP provides superior performance to GTSP as measured by convergence time, synchronization errors, and beacon transmission overhead.