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The vehicle has no parking assist system and takes much time to wander around aimlessly to find parking spaces near the destination. In recent years, how to help a driver find parking spaces by the Vehicle Ad Hoc Networks (VANETs) is an important problem. This paper proposed a novel direction-base recommendation algorithm (DRA) to reduce both the search time for parking and the competition of parking...
Network lifetime and coverage are viewed as the dominating considerations in designing the structure layout for Wireless Sensor Networks (WSN). In a WSN, the sensor nodes and its central node are located far apart to ensure good coverage over the concerning area. However, communication over long distance between the nodes consumes excessive energy from the battery powered sensors and reduces the lifetime...
Underwater communication is a challenging topic due to its singular channel characteristics. Most protocols used in terrestrial wireless communication can not be directly applied in the underwater world. In this paper, we focus on the issue of energy efficient transmission in underwater sensor networks (UWSNs) and analyze this problem in a rigorous and theoretical way. We formalize an optimization...
As a potentially competitive technique, erasure coding has been employed in wireless sensor networks (WSNs) to enhance transmission reliability. In this paper, to design a practical and efficient redundancy mechanism in WSNs, we firstly provide a theoretical study of packet delivery probability and average energy consumption for retransmission and redundancy mechanisms. The theoretical results indicate...
The mobility of underwater sensor nodes makes the network topology inconveniently controlled and slowly changed. Thus, in order to enable underwater sensor networks to work more effectively, it is necessary for us to periodically detect the coverage rate and redeploy nodes to non-coverage areas. In this paper, we take the lead in introducing the redeployment issue in underwater sensor networks. In...
Most previous models about wireless channels are mainly adopted to obtain average packet error rates or to generate artificial network traces. However, when we combine packet group transmission with error correcting mechanisms, the steady packet error rate (PER) is not accurate enough to depict the short-term error event. In this paper, we propose a Markov chain model for group transmission to indicate...
The IEEE 802.15.4/ZigBee is developed to meet the needs in wireless personal area networks by adopting CSMA/CA algorithm as the retransfer mechanism after the collision occurred. But existed evaluation for 802.15.4 mainly bases on simulation and the only few existed mathematical models are either developed immaturely or based on inaccurate assumption, thus failing to meet the rapid evolution and increasing...
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