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In a wireless powered communication network, where user equipments (UEs) harvest radio frequency energy from an access point (AP) and send data to the AP, there exists the near-far problem with respect to energy harvesting efficiency due to UEs’ random locations. In this paper, we introduce the concept of delay-aware energy balancing by minimizing the average transmission delay while taking into account...
In this paper, we consider a network where an access point (AP) wirelessly transfers energy to user equipments (UEs) and UEs use the harvested energy to communicate with the AP. Due to different radio propagation losses, the UEs far from the AP harvest little but consume much, thus suffering high transmission delay, while the UEs close to the AP has redundant energy. To reduce the average delay, we...
As the number of vehicles increases significantly, traffic congestion has become a major social problem in recent years. Such a situation can be alleviated effectively with the emerging of vehicular ad hoc network (VANET)-based real-time path planning systems. However, existing systems face the challenges of poor anti-congestion capability and high complexity. To address the related issues, an road...
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 multi-hop cognitive radio networks (CRNs), channel switching and rerouting for a secondary user's (SU's) traffic flow protect the transmission of the primary users (PUs); however, due to the extra overhead and delay, they deteriorate the quality of the SU's transmission. In this paper, aiming to achieve a stable end-to-end delivery for a secondary flow, we study the problem of joint routing and...
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