Sensor deployment is a critical issue since it reflects the cost and detection capability of wireless sensor network. Although lots work has addressed this issue, most them assume that sensing field an open space there special relationship between communication range sensors. In work, we consider as arbitrary-shaped region possibly with obstacles. Besides, allow arbitrary range, thus eliminating constraints existing results. Our approach to partition into smaller sub-regions based on shape...

Sensor deployment is a critical issue because it affects the cost and detection capability of wireless sensor network. In this work, we consider two related problems: placement dispatch. The former asks how to place least number sensors in field achieve sensing coverage network connectivity, latter determine from set mobile subset be moved an area interest with certain objective functions such that connectivity properties are satisfied. This work targeted toward planned deployment. Our...

One of the research issues in wireless sensor networks (WSNs) is how to efficiently deploy sensors cover an area. In this paper, we solve k-coverage deployment problem achieve multi-level coverage area I. We consider two sub-problems: placement and distributed dispatch problems. The asks determine minimum number required their locations I guarantee that k-covered network connected; schedule mobile move designated according result computed by strategy such energy consumption due movement...

Incorporating the environment-sensing capability of wireless sensor networks into video- based surveillance systems can provide advanced services at a lower cost than traditional systems.The integrated mobile and system (iMouse) uses static sensors to detect then analyze unusual events in environment.

To support the rising number of user equipments (UEs), LTE-A allows some UEs directly talking with each other to facilitate spectrum reuse, which is known as device-to-device (D2D) communication. Since D2D (DUEs) consume resources and bring out interference, how allocate power important. Existing studies seek make more DUEs reuse cellular (CUEs, are eNB) increase throughput. However, it inefficient for CUEs (e.g., those near cell edge) share others due high interference. Thus, a new sharing...

A data center network (DCN) is composed of many servers interconnected by well-organized switches, which involves massive amount transmissions to provide cloud services. It critical manage packet routes in DCNs avoid congestion on some links. The software-defined networking (SDN) technique supports auto-configuration switches a central controller, and gives an easy way traffic flows. In the paper, we exploit SDN improve performance fat-tree DCNs, propose low-cost, load-balanced route...

Abstract Wireless sensor networks (WSNs) offer a convenient way to monitor physical environments. In the past, WSNs are all considered static continuously collect information from environment. Today, by introducing intentional mobility WSNs, we can further improve network capability on many aspects, such as automatic node deployment, flexible topology adjustment, and rapid event reaction. this paper, survey recent progress in mobile compare works field terms of their models management...

We consider a hybrid wireless sensor network with static and mobile nodes. Static sensors monitor the environment report events occurring in sensing field. Mobile are then dispatched to visit these event locations conduct more advanced analysis. A big challenge is how schedule sensors' traveling paths an energy-balanced way so that their overall lifetime maximized. formulate this problem as multiround dispatch show it be NP-complete. Then, we propose centralized distributed heuristics paths....

Owing to the rising awareness of environmental protection and health, people put a high premium on air pollution in their living environment. It thus draws considerable attention quality monitoring cities. The paper suggests using vehicular sensor network (VSN) tactically monitor metropolitan develops an efficient data gathering estimation (EDGE) mechanism VSN. EDGE has objective adaptively change sampling rates cars, such that tradeoff between accuracy communication cost is balanced....

Wireless sensor networks are vulnerable to energy holes, where sensors close a static sink fast drained of their energy. Using mobile (MS) can conquer this predicament and extend lifetime. How schedule traveling path for the MS efficiently gather data from is critical in performance. Some studies select subset as rendezvous points (RPs). Non-RP send nearest RPs visits retrieve data. However, these assume that produce with same speed have no limitation on buffer size. When two assumptions...

Software-defined networking (SDN) makes network management easier by using a controller to govern all switches, but the may become performance bottleneck. Distributed SDN control is promising solution, which lets multiple controllers divide work, where each manages part of network. Switch migration one common means load balance controllers, transfers some switches different subnets based on workloads their controllers. The paper proposes time-sharing switch (TSSM) scheme provide more refined...

Nowadays, shopping has played a key role in our economic activity. It deserves investigation how to provide smart by promptly interacting with customers supermarkets. This paper proposes sensor-based cart (3S-cart) system using the context-aware ability of sensors detect behavior customers, and respond them real time. A prototype 3S-cart is implemented encapsulating modularized box be put on carts. Thus, lightweight easy deploy. We also demonstrate two supermarket applications 3S-cart. In...

In many WSN (wireless sensor network) applications, such as [1], [2], [3], the targets are to provide long-term monitoring of environments. energy is a primary concern because nodes have regularly report data sink and need continuously work for very long time so that users may periodically request rough overview monitored environment. On other hand, occasionally query more in-depth certain areas analyze abnormal events. These requirements motivate us propose multiresolution compression...

The paper considers a hybrid wireless sensor network with static and mobile sensors, where each can detect only one attribute of event while analyze multiple attributes events. Static sensors monitor the environment report events appear. Mobile then move to these locations conduct more in-depth analysis. A critical issue is how schedule traveling paths so as extend their lifetime. We formulate this multi-round multi-attribute dispatch problem prove it be NP-complete. Then, we develop...

Abstract To provide wireless Internet access, WiFi networks have been deployed in many regions such as buildings and campuses. However, are still insufficient to support ubiquitous service due their narrow coverage. One possibility resolve this deficiency is integrate with the wide‐range WiMAX networks. Under an integrated network, how conduct energy‐efficient handovers a critical issue. In paper, we propose handover scheme geographic mobility awareness (HGMA), which considers historical...

Long term evolution (LTE) is a standard widely used in cellular networks today. Both resource scheduling and pricing are two critical issues. However, existing studies address them separately, making the goals of improving system performance increasing operator revenue conflicting. This paper proposes pricing-aware (PARS) framework to conquer this conflict. It classifies users into three levels has modules, which installed base station core network LTE, respectively. The module uses...

Kubernetes is a powerful tool to manage containerized applications, which also regarded as one promising platform support microservices in edge computing. The scheduler key component of Kubernetes. It allocates each pod (i.e., set running containers) worker node machine). default designed for the cloud environment containing homogeneous nodes. However, IoT nodes usually have various computing power and network bandwidth. This article proposes delay-aware container scheduling (DACS) algorithm...

Narrowband Internet of Things (NB-IoT) offers three coverage enhancement (CE) levels to serve massive machines in a large area. For each CE level, the base station configures control periods determine number allocatable radio resources for signal and data transmissions. Both uplink (UL) downlink (DL) communications use same periods, but UL DL need different period lengths. In general, suitable is longer than that DL. Then, assigns machine. To this end, we study how choose length allot...

Micro-climate monitoring usually requires deploying a large number of measurement tools. By adopting vehicular wireless sensor networks (VSNs), we can use fewer tools to achieve fine-grained monitoring. This work proposes VSN architecture realize micro-climate based on GSM short messages and availability GPS receivers vehicles. We demonstrate our prototype ZigBee-based car network monitor the concentration carbon dioxide (CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Due to hardware design or cost consideration, sensors may possess sector-like sensing coverage. Furthermore, by stepper motors, can rotate cover the objects around them. This type of are called rotatable and directional (R&D) sensors. Through rotation, R&D provide temporal coverage "periodically" detecting their existence. In paper, we first develop an event-driven surveillance system sensors, where monitored equipped with infrared detectors cameras. When object is taken away, sensor...

In this paper, a hybrid sensor network consisting of static and mobile sensors is considered, where are used to detect events, can move event locations conduct more advanced analysis. By exploring the load balance concept, we propose CentralSD algorithm efficiently dispatch sensors. Our general in that numbers events be arbitrary. When than locations, transform problem maximum-matching weighted bipartite graph. there fewer an efficient clustering scheme group so approach still applied. To...