The document discusses scheduling methods for wireless sensor networks. It describes that wireless sensor network nodes have limited power, range, processing capability and memory. Some key scheduling methods discussed are:
1) TDMA based scheduling which allocates separate time slots for each node to access the medium and transmit data to save energy by putting nodes in sleep mode when not transmitting.
2) Data aggregation techniques where intermediate nodes collect and aggregate data from child nodes to reduce transmissions and save energy.
3) Contiguous link scheduling which schedules all links for a node in consecutive time slots so the node only needs to power on once to receive all data, reducing energy usage but also throughput.
The document evaluates several scheduling algorithms and