Interference‐aware convergecast scheduling in wireless sensor/actuator networks for active airflow control applications

Abstract

Emerging wireless sensor/actuator network (WSAN) technology has the potential to enable semiautonomous air-flow control to improve the aerodynamic performance of aircraft. In this paper, a WSAN comprising of multiple linear sensor clusters terminated by actuators is proposed for active airflow control with the objective of minimizing convergecast latency. Here the convergecast delay is defined as the time required from the beginning of a sampling period to all all sensor's data of this sampling period is received by the actuator. The objective is achieved by minimizing the separation distance of concurrent data transmission so that the number of nodes sending data in the same time slot is maximized. The problem turns into a scheduling problem with a proper selection of interference separation. However, most existing work on the scheduling in linear networks use the minimum separation of 2 hops to avoid collisions. This paper examines the relationship between the hop separation, signal-noise-ratio and the latency to make a selection of interference separation. A new interference aware hybrid line scheduling (HLS) algorithm is proposed and its energy consumption is analyzed. Compared with other line scheduling policies. the analysis and simulation results show that, at moderately high node densities, the proposed HLS with carefully selected hop separation is able to reduce both the delay by up to 15 % and the energy consumption somehow.

Optimizing the throughput‐lifetime tradeoff in wireless sensor networks with link scheduling, rate adaptation, and power control

“…A lower bound on the solution is updated at each iteration of the master problem to terminate the procedure once a user-specified optimality gap is attained. The authors in [16] considered convergence cast latency in wireless sensor/actuator networks. The minimization of this latency is achieved first by minimizing the separation distance of concurrent data transmissions, so that the number of nodes sending data in the same time slot is maximized.…”

“…Constraint (15) forces a transmitter to select only one power level. Constraint (16) is an enforcement of rule (2) by ensuring that the SINR at the receiver must be above the thresholdˇr when the variable x`r is nonzero. Otherwise, this constraint is redundant.…”

Reducing Idle Listening during Data Collection in Wireless Sensor Networks

“…Dai et al [13] also address data collection, considering a multi-sink setting for multi-lines and using a variable interference model, compared to constant interference distance of two hops as in the above-mentioned articles. Incel et al [5] explain that if all interference is mitigated between nodes then data collection can be performed in max{2n k − 1, N } time slots.…”