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By using the advantages of modern social tools, a new agricultural information service platform was designed and implemented, which was re developed by WeChat platform. It provided an efficient and convenient information service for farmers, and carried out a wide range of applications in the suburbs of Beijing.
The surging deployment of WiFi hotspots in public places drives the blossoming of location-based services (LBSs) available. A recent measurement reveals that a large portion of the reported locations are either forged or superfluous, which calls attention to location authentication. However, existing authentication approaches breach user's location privacy, which is of wide concern of both individuals...
Dynamic video streaming protocols allow video clients to adaptively choose video rates to improve viewer Quality-of- Experience (QoE). Existing works on rate adaptation choose the video rate according to network capacity or buffer state, however, they didn't consider the early quitting problem. Most viewers quit before the video ends, in which case optimal solutions for complete video sessions may...
In this paper, we tackle the problem of stimulating smartphone users to join mobile crowdsourcing applications with smartphones. Different from existing work of mechanism design, we uniquely take into consideration the crucial dimension of location information when assigning sensing tasks to smartphones. However, the location awareness largely increases the theoretical and computational complexity...
In this paper, we consider the scenario where a secondary operator leases licensed spectrum from a spectrum owner and then serves its end users with both licensed and unlicensed bands. An end user can decide its traffic segmentation in terms of the percentage of its total amount of traffic demand transmitted via licensed and unlicensed band respectively. The optimal spectrum investment and pricing...
Target Tracking is an important problem in sensor networks, where it dictates how accurate a target's position can be measured. In response to the recent surge of interest in mobile sensor applications, this paper studies the target tracking problem in a mobile sensor network (MSN), where it is believed that mobility can be exploited to improve the tracking resolution. This problem becomes particularly...
We study the throughput capacity of mobile wireless ad hoc networks with infrastructure support. Mobility and infrastructure support independently have been shown to be effective ways to improve capacity, but few work has analyzed the impact of their combination. In our work we consider an ad hoc network with n users and k base stations. All base stations are wired to each other with bandwidth c(n)...
In this paper, we study the delay-constrained message delivery capacity formulation in mobile wireless networks. The message delivery capacity specifies the maximum percentage of messages that can be successfully delivered to base stations within a given time constraint. By taking full advantage of node mobility and rendezvous during mobile node encounter, messages can be delivered to a base station...
In this paper, we study the delay-constrained information coverage problem in mobile wireless networks. Motivated by real application needs, our formulation takes advantage of the node mobility for information collection, which takes place when a node moves into the proximity of stationary base stations. To the best of our knowledge, we present the first formulation for the delay-constrained information...
We are interested in event collection in a 2D region where sensors are deployed to detect and collect interested events. Using traditional multi-hop routing in wireless sensor networks to report events to a sink node or base station, will result in severe imbalanced energy consumption of static sensors. In addition, full connectivity among all the static sensors may not be possible in some cases since...
The IEEE 802.16e mobile WiMAX technology aims to provide with an energy efficient communication platform for various mobile applications. In the standard, the sleep mode feature with three Power Saving Classes (PSCs) is designed to compensate for the power saving as the target. Prior work has shown that the proposed Markov Decision Process (MDP) approach can achieve the optimal performance in terms...
There is a growing interest in using wireless sensor networks for security monitoring in the underground coal mines. In such applications, the sensor nodes are deployed to detect interested events, e.g., the density of certain gas at some locations is higher than the predefined threshold. These events are then reported to the base station outside. Using conventional multi-hop routing for data reporting,...
In this paper we argue for the need for research in the area of aspect-oriented middleware for mobile real-time systems, covering concepts, principles, methods supporting the development of aspect-oriented middleware for mobile real-time systems. We give an overview of the state of the art in this area and show some of the research directions that have been considered up to now and describe ongoing...
Mobile sensor has enabled many new applications in wireless sensor networks where coverage is one of the most important problems to support those applications. Previous research works of coverage issue mainly focus on the static sensor network, which can not handle the significant challenge brought by the node mobility. In this paper, we consider the coverage problem in mobile sensor networks under...
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