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Energy harvesting is a promising solution to prolong the lifetime of energy-constrained wireless sensor networks. In particular, scavenging energy from ambient radio frequency (RF) signals has drawn a lot of attention recently. In this paper, we apply simultaneous wireless information and power transfer (SWIPT) to a clustered sensor network such that a cluster head node harvests the wireless energy...
Smart Grid is a complex cyber-physical system that modernizes the traditional electric power infrastructure by sensing, control, computation and communication. Validating the functionality, security and reliability of Smart Grid applications within such a system requires the modeling and emulation of both power networks and communication networks, as well as the interactions between them. In this...
Conjunction of USB applications with wireless technologies leads us to USB over Wi-Fi through the means of Wireless Serial Extension (WSE). However, USB and Wi-Fi has distinct data prioritization methods, which causes problems in existing QoS protocols when the two technologies are used together. To solve this problem, this poster proposes and evaluates the dynamic QoS adaptation scheme, which intelligently...
In response to the rapid growth of mobile video traffic, major video providers such as YouTube and Netflix have recently adopted HTTP adaptive streaming protocol for video delivery. However, the possible degradation and instability in the perceived video quality are still the major issues with this protocol. Moreover, this protocol can cause unfairness among competing players in addition to bandwidth...
Online shopping has been emerging in the past years and significantly affected conventional shopping styles, but many people still favor retail stores for reasons such as social lives and trying dresses. When they find interested goods, usually hope to obtain more information of them from online shopping for price comparison and so forth. However, state of the art solutions either have users frequently...
There has been a huge growth in the number of wireless-enabled devices possessed by a user. Over two third of adults in United States currently own three devices — laptop, smartphone and tablet. In this paper, we provide a first look at the network usage behavior of today's multi-device users. Using the data collected from a large university campus, we provide a detailed measurement-based characterization...
As special applications of delay tolerant networks (DTNs), efficient data collection and event detection in the deep sea pose some unique challenges, due to the need of timely data reporting and the delay of acoustic transmission in the ocean. Since underwater communications suffer from a significant signal attenuation, autonomous underwater vehicles (AUVs) deployed in the deep sea are used to surface...
This paper presents a confidence-aware maximum likelihood estimation framework to solve the truth estimation problem in social sensing applications. Social sensing has emerged as a new paradigm of data collection, where a group of individuals volunteer (or are recruited) to share certain observations or measurements about the physical world. A key challenge in social sensing applications lies in ascertaining...
It has been proved that network coding can optimize routing in wireless networks. Thus, in deterministic routing, coding is considered as an important factor for route selection. While the existing deterministic routing solutions detect paths with coding opportunities based on the two-flow coding, little attention has been drawn to the multi-flow situation. Coding multiple flows directly, however,...
This paper presents a spatial-temporal aware analytical framework to solve the truth finding problem in social sensing applications. Social sensing has emerged as a new big data application paradigm of collecting observations about the physical environment from social sensors (e.g., humans) or devices on their behalf. The collected observations may be true or false, and hence are viewed as binary...
In this paper, we propose a new power save operation as well as the corresponding protocol, called WiFi in Zizz (WiZizz), which judiciously exploits the characteristic of the channel bonding defined in IEEE 802.11ac and efficiently handles the channel bandwidth in an on-demand manner to minimize the traumatic energy spent by IEEE 802.11ac devices. Our extensive measurement and simulation show significant...
It has recently been shown that distributed queue-based adaptation of CSMA's contention aggressiveness can provably optimize network utility. However, such an approach is fragile, in that it suffers high performance degradation under conditions of asymmetric channels, heterogeneous traffic, and packet collisions. In this work, we address the main sources of performance degradation in optimal CSMA...
Reprogramming in wireless sensor networks (WSNs) is a procedure of disseminating a new code image and changing the old image into the new one without manual intervention. It can be used for updating programs, fixing faults, and changing network functionality. Since WSNs are mostly deployed in unattended and hostile environments, secure reprogramming schemes aiming at authenticity and integrity are...
Context is the brain of ubiquitous computing. All the intelligence to the ubiquitous system comes from the knowledge of the context. The context is obtained after the processing and reasoning of different sensor data. These sensors are physically distributed in real world. With the advancement in sensing, processing and communication technologies, a distributed processing and reasoning has become...
Accurate prediction of wireless network performance is important when performing link adaptation or resource allocation. However, the complexity of interference interactions at MAC and PHY layers, as well as the vast variety of possible wireless configurations make it notoriously hard to design explicit performance models. In this paper, we advocate an approach of “learning by observation” that can...
With the proliferation of context-aware services and human-computer interaction scenarios, the novel techniques of motion detection have attracted growing interests. There are many products which use camera, infrared sensors, RF, etc. With more Wi-Fi devices in homes and the ability to measure the PHY layer infomation, Wi-Fi based motion detection has attracted more attention than before. In this...
In wireless LANs, MAC protocols perform one of the most important tasks: efficiently sharing the limited bandwidth among the contending stations. In IEEE 802.11, Distributed Coordination Function (DCF) is used as a default MAC protocol. Despite its wide acceptance, it has two major downsides: i) Channel idle time and ii) Collision overheads. Besides, the use of the explicit ack frames incurs extra...
In order to solve how to enhance the discovery efficiency and coverage, based on DHT (Distributed Hash Table), we put forward a new algorithm of service discovery for mobile application. In traditional DHT discovery algorithm, each node maintains the finger-table that store node information of adjacent node. By using Small-World Theory, we put forward adding a remote node into the finger-table and...
Cognitive radio (CR) techniques promise to significantly increase the available spectrum thus wireless bandwidth. With the increase of spectrum allowed for CR, it is critical and challenging to perform efficient wideband sensing. We propose an integrated sequential wideband sensing framework which concurrently exploits sequential detection and compressed sensing (CS) techniques for more accurate and...
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