SDP: Separate Design Principle for Multichannel Scheduling in Priority-Aware Packet Collection

Abstract

Industrial wireless sensor networks (IWSNs) are expected to play a key role in the next generation of Industry Internet, which present a flexible and low-cost way to comprehensively perceive process systems in industrial field. Priority-aware packet collection is of vital importance for IWSNs to gather the data packets according to their differentiated transmission requirements. In multichannel IWSNs, this is still a challenging problem due to the complexity of collision avoidance design and transmission delay optimization. In this paper, we consider the packet collection with two priority classes, and propose a separate design principle (SDP) for multichannel scheduling based on IEEE 802.15.4e protocol. In SDP, we separately design two multichannel superframes for high and low priority sensors, where each superframe fully uses the time slots on all channels. Then, a concession strategy is devised to resolve the possible transmission collisions. Simulation results demonstrate that SDP based multichannel scheduling achieves lower transmission delay to both high and low priority sensors comparing with the IEEE 802.15.4e protocol.