The Analysis And Research Of Improved Time Synchronization Algorithm TPSN For Wireless Sensor Network

Wireless sensor network(WSN) is a new kind of information acquisition system which is built up by a large number of micro sensors with dynamic topology ad-hoc. In WSN, when a plurality of nodes need work together to complete a task, it must meet time synchronization between them, so time synchronization has become an essential technology. Limited energy of nodes is one of the main features of WSN, so the energy consumption is the primary consideration when we design the time synchronization protocol. How to use the energy of nodes efficiently, reduce the energy consumption and guarantee the accuracy of synchronization algorithm is the core content for time synchronization algorithm in WSN.This paper is based on Timing-Sync Protocol for Sensor Networks(TPSN),by decreasing the numbers of exchanging packets between synchronization nodes to improve it. we want to achieve the purpose of reducing energy consumption, ensuring the synchronization accuracy as a precondition. Finally, we propose an Improved TPSN protocol (I-TPSN).The improved protocol is transplanted to the NS2 of simulation platform to simulate and the performance of the protocol is analyzed from the energy consumption and synchronization error.The results showed that, I-TPSN algorithm greatly reduces energy consumption, especially in multi-hop, not only reduces energy consumption, and to ensure the synchronization accuracy, which meets the design requirements of the algorithm. Finally, using the chip of CC2530 to build a hardware system based on ZigBee, the I-TPSN algorithm is implemented on it, in order to achieve dynamic network and clock synchronization between nodes.