Resilient Power-Constrained Embedded Communication Terminals (SPP 2378 ResPECT)

Within the wide subject of resilience in networked worlds ResPECT focuses on a core element of all networked systems: sensor- and actuator-nodes in cyber-physical systems. Communication up to today is understood and implemented as an auxiliary functionality of embedded systems. The system itself is disruption-tolerant and able to handle power failures or in a limited scope even hardware problems, but the communication isn't part of the overall design. In the best case it can make use of the underlying system resilience. ResPECT develops a holistic operating system and communication protocol stack, assuming that conveying information (the receipt of control data for actuators or the sending of sensor data) is a core task of all networked components. Consequently it must become a part of the operating system's management functionality. ResPECT builds on two pillars: Non-volatile memory and transactional operation. Non- volatile memory in recent years has evolved towards a serious element of the storage hierarchy. Even embedded platforms with exclusively non-volatile memory become conceivable. Network communication, other than social communication, is transactional in its design: Data is collected and under channel constraints like latency, error-resilience and energy consumption and content constraints like age and therewith value of information is transmitted between the communication partners. Other than for operating systems this communication, however, faces many external disruptions and impacts. In addition, the duration of a disruption can have severe implications on the validity of already completed transactions like the persistence of the physical connection. Hence on resumption all this has to be considered. ResPECT consequently will - by interdisciplinary research of operating system and communication experts - develop a model based on transactions and will apply non-volatile memory to ensure, that states during the flow of transactions are known at any point in time and can and will be stored persistently. This monitoring and storing functionality must be very efficient (with respect to the energy consumption as well as to the amount of data to be stored in non-volatile memory) and hence be implemented as a core functionality of the operating system. To ensure generalizability and to have the model available for a variety of future platforms, ResPECT will focus on IP-networks and use communication networks which typically are operated as WAN, LAN or PAN (wide, local or personal area networks).