Efficient Aggregation Scheduling in Multihop Wireless Sensor Networks with SINR Constraints

We study delay-efficient data aggregation scheduling in wireless sensor networks subject to signal to interference-plus-noise ratio (SINR) constraints. We construct a routing tree and propose two scheduling algorithms that can generate collision-free link schedules for data aggregation. We prove that the delay of each algorithm is O(R + Δ) time slots, where R and Δ are respectively the graph radius and the maximum node degree in a reduced communication graph of the original network; the proposed algorithms are asymptotically optimum on delay in random wireless sensor networks. We evaluate the performances of the proposed algorithms and the simulation results corroborate our theoretical analysis.