Data collection is a crucial operation in wireless sensor networks. The design of data schemes challenging due to the limited energy supply and hot spot problem. Leveraging empirical observations that sensory possess strong spatiotemporal compressibility, this paper proposes novel compressive scheme for We adopt power-law decaying model verified by real sets then propose random projection-based estimation algorithm model. Our requires fewer compressed measurements, thus greatly reduces...

Recently, adopting mobile energy chargers to replenish the supply of sensor nodes in wireless networks has gained increasing attention from research community. Different harvesting systems, utilization is able provide more reliable than dynamic harvested surrounding environment. While pioneering works on recharging problem mainly focus optimal offline path planning for chargers, this work, we aim lay theoretical foundation on-demand charging (DMC) problem, where individual request charger...

In extremely low duty-cycle sensor networks, end-to-end communications cannot afford to maintain an always-awake communication backbone. Low duty-cycle, accompanied by the unreliable nature of wireless communication, makes it essential design a new data forwarding scheme for such so as achieve network energy efficiency, reliability, and timeliness in integrated fashion.

Intended for network-wide dissemination of commands, configurations and code binaries, flooding has been investigated extensively in wireless networks. However, little work yet done on low-duty-cycle sensor networks which nodes stay asleep most time wake up asynchronously. In this type network, a broadcasting packet is rarely received by multiple simultaneously, unique constraining feature that makes existing solutions unsuitable. Combined with unreliable links, new challenging issue.In...

QoS routing is an important research issue in wireless sensor networks (WSNs), especially for mission-critical monitoring and surveillance systems which requires timely reliable data delivery. Existing work exploits multipath to guarantee both reliability delay constraints WSNs. However, the approach suffers from a significant energy cost. In this work, we exploit geographic opportunistic (GOR) provisioning with end-to-end GOR protocols are not efficient WSNs, terms of efficiency computation...

Flooding service has been investigated extensively in wireless networks to efficiently disseminate network-wide commands, configurations, and code binaries. However, little work done on low-duty-cycle sensor which nodes stay asleep most of the time wake up asynchronously. In this type network, a broadcasting packet is rarely received by multiple simultaneously, unique constraining feature that makes existing solutions unsuitable. paper, we introduce Opportunistic Flooding, novel design...

Recently, adopting mobile energy chargers to replenish the supply of sensor nodes in wireless networks has gained increasing attention from research community. The utilization provides a more reliable than systems that harvested dynamic surrounding environment. While pioneering works on recharging problem mainly focus optimal offline path planning for chargers, this work, we aim lay theoretical foundation on-demand charging problem, where individual request charger when their runs low....

Providing reliable and efficient communication under fading channels is one of the major technical challenges in wireless sensor networks (WSNs), especially industrial WSNs (IWSNs) with dynamic harsh environments. In this work, we present Reliable Reactive Routing Enhancement (R3E) to increase resilience link dynamics for WSNs/IWSNs. R3E designed enhance existing reactive routing protocols provide energy-efficient packet delivery against unreliable links by utilizing local path diversity....

In order to enhance the efficiency of radio frequency identification (RFID) and lower system computational complexity, this paper proposes three novel tag anticollision protocols for passive RFID systems. The proposed are based on a binary tree slotted ALOHA (BTSA) algorithm. BTSA, tags randomly assigned slots frame if some collide in slot, collided slot will be resolved by splitting while other subsequent wait. utilize dynamic, an adaptive, method adjust length value close number tags,...

In this work, we introduce the concept of Dynamic Switch-based Forwarding (DSF) that optimizes 1) expected data delivery ratio, 2) communication delay, or 3) energy consumption for low-duty-cycle wireless sensor networks under unreliable links. DSF is designed with possibly links and predetermined node schedules. To our knowledge, these are most encouraging results to date in new research direction. paper, evaluated a theoretical analysis, extensive simulation, physical testbed consisting 20...

This paper proposes a Trajectory-Based Data (TBD) Forwarding scheme, tailored for the data forwarding roadside reports in light-traffic vehicular ad hoc networks. State-of-the-art schemes have demonstrated effectiveness of their strategies by exploiting known traffic statistics (e.g., densities and speeds). These results are encouraging, however, further improvements can be made taking advantage growing popularity GPS-based navigation systems. presents first attempt to effectively utilize...

This paper proposes a trajectory-based data forwarding (TBD) scheme, tailored for the in light- traffic vehicular ad-hoc networks. State-of-the-art schemes have demonstrated effectiveness of their strategies by exploiting known statistics (e.g., densities and speeds) these These results are encouraging, however, further improvements can be made taking advantage growing popularity GPS-based navigation systems. presents first attempt to investigate how effectively utilize vehicles" trajectory...

This paper proposes Trajectory-based Statistical Forwarding (TSF) scheme, tailored for the multihop data delivery from infrastructure nodes (e.g., Internet access points) to moving vehicles in vehicular ad hoc networks. To our knowledge, this presents first attempt investigate how effectively utilize packet destination vehicle's trajectory such an infrastructure-to-vehicle delivery. is performed through computation of a target point based on that optimal rendezvous and vehicle. TSF forwards...

Flooding in low-duty-cycle wireless sensor networks is very costly due to asynchronous schedules of nodes. To adapt existing flooding-tree-based designs for networks, we shall schedule nodes common parents wake up simultaneously. Traditionally, energy optimality a designated flooding-tree achieved by selecting with the highest link quality. In this work, demonstrate that surprisingly more can be saved considering correlation. Specifically, work first experimentally verifies existence...

License-assisted access (LAA) is a promising technology to offload dramatically increasing cellular traffic unlicensed bands. Challenges arise from the provision of quality-of-service (QoS) and quantification capacity, due distributed heterogeneous nature LAA legacy systems (such as Wi-Fi) coexisting in In this paper, we develop new theories effective capacity measure under statistical QoS requirements. A four-state semi-Markovian model developed capture transmission collisions, random...

Vehicular ad hoc networks (VANETs) represent promising technologies for improving driving safety and efficiency. Due to the highly dynamic patterns of vehicles, it has been a challenging research problem achieve effective time-sensitive data forwarding in vehicular networks. In this paper, Shared-Trajectory-based Data Forwarding Scheme (STDFS) is proposed, which utilizes shared vehicle trajectory information address problem. With access points sparsely deployed disseminate vehicles'...

Passive indoor localization for smartphones requires no explicit cooperation of the smartphone and enables a new spectrum applications such as passive user tracking, mobility monitoring, social pattern analysis, etc. However, existing methods either achieve coarse-grained accuracy or require expensive infrastructure support. In this paper, we present Pallas, self-bootstrapping system fine-grained using non-intrusive WiFi monitors. Pallas uses off-the-shelf access point hardware to...

In a cache-enabled D2D underlaid cellular network, cooperation of BS caching and can further exploit the limited storage capacity achieve more efficient wireless resource utilization. this complex network scenario, closed form expression for successful transmission probability is firstly derived using stochastic geometry, to measure proportion users satisfying delay guarantee. On basis, cooperative placement problem formulated maximize probability. We prove it be transformed equivalently...

Data delivery is a major function of sensor network applications. Many applications, such as military surveillance, require the detection interested events to be reported command center within specified time frame, and therefore impose real-time bound on communication delay. On other hand, conserve energy, one most effective approaches keep nodes in dormant state long possible while satisfying application requirements. Obviously node cannot communicate if it not active. Therefore, deliver...

This paper proposes a data forwarding scheme called Trajectory-based Statistical Forwarding (TSF), tailored for the delivery from infrastructure nodes (e.g., Internet access points) to moving vehicles in vehicular networks. To our knowledge, this presents first attempt investigate how effectively utilize packet destination vehicle's trajectory such an infrastructure-to-vehicle delivery. is performed through computation of target point based on that optimal rendezvous and vehicle. TSF...

With advances in energy harvesting techniques, it is now feasible to build sustainable sensor networks (SSN) support long-term applications. Unlike battery-powered networks, the objective of effectively utilize a continuous stream ambient energy. Instead pushing limits conservation, we are aiming at energy-synchronized designs <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> keep supplies and demands balance. Specifically, this work...

As a supporting primitive of many mobile device applications, neighbor discovery identifies nearby devices so that they can exchange information and collaborate in peer-to-peer manner. To date, schemes trade long latency for energy efficiency require collaborative duty cycle pattern, thus are not suitable interactive applications where user is unable to configure others' devices. In this paper, we propose Acc, which serves as an on-demand generic accelerating middleware existing schemes. Acc...

Large-scale battery packs with hundreds/thousands of cells are commonly adopted in many emerging cyber-physical systems such as electric vehicles and smart micro-grids. For applications, the load requirements on dynamic could significantly change over time. How to resolve discrepancies between output power supplied by system input required loads is key development large-scale systems. Traditionally, voltage regulators often convert outputs match loads' power. Unfortunately, efficiency...

Different from energy harvesting which generates dynamic supplies, the mobile charger is able to provide stable and reliable supply for sensor nodes, thus enables sustainable system operations. While previous charging protocols either focus on travel distance or delay of in this work we propose a novel Energy Synchronized Charging (ESync) protocol, simultaneously reduces both them. Observing limitation Traveling Salesman Problem (TSP)-based solutions when nodes consumptions are diverse,...