access icon free Cascade self-tuning control architecture for QoS-aware MAC in WSN

Wireless sensor network (WSN) has proposed requirements more than just data collection and transmission. Different types of traffics call for different quality of service (QoS) demands. However, for the nature of uncertainty of wireless link and unpredictability of traffic transmission, it is very hard to distribute resources to different traffics precisely ahead of time. Based on the cascade self-tuning control, this study proposes the cascade self-tuning architecture for FD-MAC (CSFD-MAC) architecture. Taking the advantage of feedback theory, CSFD-MAC decouples contention window (CW) adaption and active time (AT) adaption into two separated cascading control loops. CW controller aims for the absolute node-to-node delay to a fixed value and AT controller guarantees the relative delay ratio. The software simulations illustrate the validity of controller design and the hardware experiments demonstrate the ability of CSFD-MAC in the absolute delay control as well as the proportional delay differentiation. More important, CSFD-MAC which takes AT as a controlled variable, not only has a much more superior performance in the metrics of delay and throughput compared with other QoS-aware MAC, but also has the advantage of efficient power management.

Inspec keywords: PD control; wireless sensor networks; cascade control; access protocols; control system synthesis; delays; telecommunication traffic; adaptive control; quality of service; self-adjusting systems

Other keywords: feedback theory; AT controller; wireless link uncertainty; data collection; wireless sensor network; quality-of-service demands; cascade self-tuning media access control architecture; cascade self-tuning control architecture; traffic transmission unpredictability; controller design; active time adaption; QoS-aware MAC; AT adaption; software simulations; CSFD-MAC architecture; separated cascading control loops; QoS demands; CW controller; proportional delay differentiation; data transmission; CW adaption; WSN; contention window adaption; absolute node-to-node delay

Subjects: Control applications in radio and radar; Control system analysis and synthesis methods; Protocols; Protocols; Wireless sensor networks; Distributed parameter control systems; Self-adjusting control systems

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