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As an efficient way to collect sensing data, participatory sensing has been receiving more and more attentions and its applications cover various areas such as traffic control and management, environmental monitoring, etc. In a participatory sensing system, Service Provider (SP) works as the task promulgator, Smartphone User (SU) works as the task executor and the Platform handles the sensing task...
In cognitive vehicular ad hoc networks (CVANETs), channel conditions are highly dynamic due to both vehicle mobility and primary user activity. In this paper, to support high-quality video playback in such a challenging scenario, an adaptive video streaming algorithm built on scalable video coding (SVC) is proposed for reducing interruption ratio and improving visual quality. The proposed streaming...
To support delay-sensitive traffic in multi-channel cognitive radio systems, designing a channel access scheme faces two major challenges, namely, the long waiting time due to continuous channel occupancy of primary users (PUs) and the performance degradation due to transmission collisions among secondary users (SUs). To address both issues, we propose a two-phase channel access scheme, which consists...
Real-time path planning is one of emergent approaches which efficiently reduce traffic jam in urban scenarios. Designing an efficient path planning strategy to achieve optimal vehicle-traffic flow control still remains a challenging problem, especially when we take human's uncooperative and uncoordinated selfish behaviors into consideration. In this paper, we first introduce an intelligent transportation...
In this paper, we study the routing and resource allocation problem in multi-hop cognitive radio networks. The collision between primary users (PUs) and secondary users (SUs) is taken into consideration, which is unavoidable if activities of PUs and SUs are not synchronized with each other. Our objective is to maximize the average throughput of a secondary traffic flow while the number of collisions...
In this paper, we propose a stopping rule-driven channel access scheme for a secondary user pair in multichannel cognitive radio networks (CRNs), aiming to achieve a desired tradeoff between channel sensing and channel access. In the proposed approach, we first formulate the sensing-access tradeoff problem as a 1-stage look-ahead stopping problem. We then derive two stopping conditions, namely power-limited...
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