Performance Composition for Cyber Physical Systems

Extensive studies have shown that cross-layer wireless networking design and optimization can gain significant performance improvements for cyber physical systems. Because this optimization problem is NP-hard, most previous solutions develop heuristics based on mathematical abstractions. In highly dynamic networks, such models may not be accurate or efficient. To address this problem, we explore a hierarchical control approach to optimize the performance of the system. In this design, a network controller adjusts the performance requirements for links at different control rates, while every node has a controller that takes the performance requirements as input and adaptively adjusts parameters of network protocols cross-layer. This design is based on a reflective architecture that we propose to treat control as a first class element in CPS system designs, enabling component performance analysis for CPS. Our solution can potentially achieve good control performance: stable network performance and good transient performance.