Method for duty cycle of sleep/active mode based on TDMA in a wireless sensor network system and sensor network system using the same

摘要

PURPOSE: An inactivity / activity duty cycle method is provided to maximize the efficiency of a channel recycle by minimizing the size of a virtual cluster. CONSTITUTION: Each node dynamically searches a 1-hop distance neighbor node by a three step handshake of a Beacon/Approval/ACK frame on a free contention access period of a time frame. Each node selects an initial activation schedule. The activated node selects the next active schedule by the second handshake of the Beacon/Approval frame on the control period. The node activated on the corresponding time slot as an owner has an exclusive channel access right for the corresponding time slot. The node transmits data on the transmission time.