CAJ | 학술논문

为降低无线传感器网络同步过程中的能量消耗，加快实现全网络时间同步的收敛速度，提出基于变长帧的时间同步算法。利用精短同步帧结构对时间信息进行压缩，采用短帧、完整帧交替转发保证同步精度，使被同步节点自主判断接收信息的完整性，并通过请求重传机制应对同步过程中的完整帧丢失问题。分析结果表明，实现全网同步的收敛时间与同步开销成正比，变长帧时间同步算法通过去除同步时间数据中的冗余信息，可有效缩短该收敛时间。传感器节点同步实验结果表明，该算法适用于多种时间同步模型，在保证传感网同步精准度的前提下，可减少同步数据通信量，提升能量效率。
위강저무선전감기망락동보과정중적능량소모，가쾌실현전망락시간동보적수렴속도，제출기우변장정적시간동보산법。이용정단동보정결구대시간신식진행압축，채용단정、완정정교체전발보증동보정도，사피동보절점자주판단접수신식적완정성，병통과청구중전궤제응대동보과정중적완정정주실문제。분석결과표명，실현전망동보적수렴시간여동보개소성정비，변장정시간동보산법통과거제동보시간수거중적용여신식，가유효축단해수렴시간。전감기절점동보실험결과표명，해산법괄용우다충시간동보모형，재보증전감망동보정준도적전제하，가감소동보수거통신량，제승능량효솔。
This paper proposes time synchronization algorithm based on the length variable frame to solve the energy consumption and convergence time problem of Wireless Sensor Network(WSN) synchronization. This algorithm utilizes short frame structure to compress the synchronization time. It alternately forwards short frame and full frame to guarantee synchronization accuracy. Each receiver makes independent judgment about the integrities of messages and adopts retransmission mechanism to solve the frame loss problem. The results show that the whole network convergence time is proportional to the synchronization overhead. The algorithm can effectively reduce the convergence time by removing redundant information. In order to verify the efficacy of the proposed algortihm, this paper implements it on common sensor nodes. Experiment results show that the proposed algorithm is suitable for multiple models. It can effectively reduce the data traffic overhead while keeping the time accuracy, and improve the energy efficiency.