Superframe scheduling mechanism for wireless sensor networks（ WSNs） under tree structure for communication conflict of wireless cluster tree networks and exposed node problem is studied

a set of analysis theory

criterion are put forward and then a GTS slot and scheduling algorithm based on differentiated services is given based on this.Simulation tests are carried out using the NS2 software

the results show that the algorithm can make use of the channel fully

the rational allocation of time slots

to avoid unnecessary conflict in communication

it has obvious effect on increasing throughput

reducing packet loss rate and stablizing network delay.