PerCom 2021 solicits research contributions in all areas pertinent to pervasive computing and communications, especially those that cross traditional research boundaries. In particular, we target:

• Advances in pervasive systems and infrastructures: middleware systems and services; data engineering for pervasive computing; clouds, fog and edge computing; integrations of smartphones in pervasive experiences; applications of device-to-device coordination
• Theories, models, and algorithms: context modeling and reasoning; adaptive computing; activity and emotion recognition; programming paradigms; applied machine learning; deep machine learning; federated learning; casual     learning; cognitive computing; complex networks; spatio-temporal modeling techniques
• Domain-specific challenges and novel applications: urban/mobile crowdsensing & intelligence; PerCom for healthcare and well-being; cyber-physical PerCom; smart homes and virtual assistants; innovative PerCom     applications (e.g., sports analytics, crime prevention, pervasive nowcasting).
• Intersections of PerCom with: opportunistic networks; IoT and sensor systems; RFID systems; pervasive data science, cyber physical systems.
• New techniques for user-level concerns: participatory and social sensing; trust, security, and privacy; user interface, interaction, and persuasion; online and offline social networking and pervasive computing.
• Technological innovations: architectures, protocols, and technologies for pervasive communications; energy-harvesting, self-powered, or battery-less systems; mobile and wearable systems; smart devices and environments;     positioning and tracking technologies; wireless crowd-recharging; device-free human sensing.