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In recent years, the wireless local area networks (WLAN) access points (APs) are being deployed rapidly in the offices and the campuses to satisfy the quality of service (QoS) requirements such as network bandwidth. However, many empirical studies show that a large fraction of idle WLAN resources result in the significant energy losses. To reduce the energy consumption without violating the QoS requirement,...
Formal models used for representing recurrent real-time processes have traditionally been characterized by a collection of jobs that are released periodically. However, such a modeling may result in resource under-utilization in systems whose behaviors are not entirely periodic. For instance, tasks in cyber-physical system (CPS) may change their service levels, e.g., periods and/or execution times,...
The demand for more computing power in current real-time systems carries on the development and research on multicore devices. Especially for hard real-time applications, like an engine control system, the software needs to be distributed and scheduled effectively. These applications consist of many tasks, which communicate data among each other. Considering a multicore system, communication between...
In this paper, we propose a cloud-assisted network coded packet retransmission approach to reduce the number of packet retransmission in wireless multicasting. It is shown that the efficiency of packet retransmission can be significantly improved if we include network topology information (e.g., Network connectivity) during the encoding process of network coding. We leverages the capability of software-defined...
This paper presents the full analysis and design details of an RF subsystem used in dynamic spectrum sharing (DyS2) system at TV band. The interferences between DyS2 system and TV system are analyzed to derive the design demands of RF subsystem used in DyS2 system. The analyses are based on the criterion that the receivers in RF subsystem must alleviate the interference caused by TV system and the...
Many cyber-physical systems consist of a collection of control loops implemented on multiple electronic control units (ECUs) communicating via buses such as FlexRay. Such buses support hybrid communication protocols consisting of a mix of time- and event-triggered slots. The time-triggered slots may be perfectly synchronized to the ECUs and hence result in zero communication delay, while the event-triggered...
Dynamic power management has become essential for battery-driven embedded systems. This paper explores how to efficiently and effectively reduce the energy consumption of a device (system) for serving multiple event streams. Considering two different preemptive scheduling, i.e., earliest deadline first and fixed priority, we propose new method to adaptively control the power mode of the device according...
Power dissipation has constrained the performance boosting of modern computer systems in the past decade. Dynamic power management has been widely applied to change the system (or device) state dynamically to reduce the power consumption. This paper explores how to effectively reduce the energy consumption to handle event streams with hard real-time guarantees. We adopt Real-Time Calculus to describe...
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