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Age of Information is a measure of the freshness of status updates in monitoring applications and update-based systems. We study a real-time sensing scenario with a sensor which is restricted by time-varying energy constraints and battery limitations. The sensor sends updates over a packet erasure channel with no feedback. The problem of finding an age-optimal threshold policy, with the transmission...
In this paper, we consider a scenario where an energy harvesting sensor continuously monitors a system and sends time-stamped status updates to a destination. The destination keeps track of the system status through the received updates. We use the metric Age of Information (AoI), the time that has elapsed since the last received update was generated, to measure the “freshness” of the status information...
Underwater Wireless Sensor Network (UWSN) is newly emerged and developed branch of Wireless sensor technology. In UWSN small sensor nodes with limited battery and limited memory are deployed in underwater environment. Due to multiple differences from terrestrial Wireless Sensor Networks (WSN), radio waves cannot be used in underwater communication. Acoustic channels are used for communication in sea...
In this paper, we propose a novel LuxUI based on an ambient light sensor as an alternative input method for smartwatches. We present a concept of LuxUI with design and implementation details of LuxUI interactions and events followed by possible applications and discussion issues. The proposed LuxUI is simple in design yet effective which works well for 200 ms interval interaction with a modest battery...
A source submits status updates to a service facility for delivery to a monitor. Each update requires energy and the source is powered by a stochastic energy harvesting system. With knowledge of the service facility state, the source avoids queue-induced delays by submitting a fresh update only after the service completion of a prior update. For a source with a large battery, we evaluate updating...
The paper presents a Li-ion Battery protect chip and the system combined with the actual commercial products. By giving a complete global view diagram, the paper introduces the implementation of several modules of the chip, including the voltage comparator circuit, the delay circuit and battery status monitor circuit. Battery status monitor circuit is responsible for monitoring the status of the battery,...
We propose a battery supervisory circuit (BSC) for wireless sensor nodes that automatically adapts to varying battery health, as reflected by its internal resistance (RBAT), and establishes a constant effective threshold voltage. Compared to a conventional fixed-threshold BSC, the new design avoids oscillation and widens the usable range of battery voltages, independent of RBAT. RBAT is measured by...
Discontinuous reception (DRX) can be configured as a power saving mechanism for user equipment (UE) in connected mode in the long term evolution advanced (LTE-A) network. Since DRX saves UE's battery power usually at the cost of increased latency, a tradeoff between these two conflicting performance metrics are inevitable. DRX parameters can be optimized for either maximizing power saving or minimizing...
In LTE networks, mobile applications and their higher data rate requirements are the latest phenomenon causing a tremendous need in power saving for mobile devices. Discontinuous reception (DRX) is one of the key power saving mechanisms in LTE. Since DRX saves battery power of user equipment usually at the expense of potential increase in latency, an optimization is needed to find the best tradeoff...
In this paper, we consider wireless communication systems where user equipments (UEs) monitor packet-data traffic characteristics and adopt Discontinuous Reception (DRX) to conserve battery power. With DRX, the receiver circuitry is configured to toggle between on (active) and off (inactive) states for specified durations, depending on the packet arrival process. Arriving at an appropriate DRX configuration...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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