3 research outputs found
Energy efficient cooperative coalition selection in cluster-based capillary networks for CMIMO IoT systems
The Cooperative Multiple-input-multiple-output (CMIMO) scheme has been suggested to extend the lifetime of cluster heads (CHs) in cluster-based capillary networks in Internet of Things (IoT) systems. However, the CMIMO scheme introduces extra energy overhead to cooperative devices and further reduces the lifetime of these devices. In this paper, we first articulate the problem of cooperative coalition’s selection for CMIMO scheme to extend the average battery capacity among the whole network, and then propose to apply the quantum-inspired particle swarm optimization (QPSO) to select the optimum cooperative coalitions of each hop in the routing path. Simulation results proved that the proposed QPSO-based cooperative coalition’s selection scheme could select the optimum cooperative sender and receiver devices in every hop dynamically and outperform the virtual MIMO scheme with a fixed number of cooperative devices
Large deviations in relay-augmented wireless networks
We analyze a model of relay-augmented cellular wireless networks. The network
users, who move according to a general mobility model based on a Poisson point
process of continuous trajectories in a bounded domain, try to communicate with
a base station located at the origin. Messages can be sent either directly or
indirectly by relaying over a second user. We show that in a scenario of an
increasing number of users, the probability that an atypically high number of
users experiences bad quality of service over a certain amount of time, decays
at an exponential speed. This speed is characterized via a constrained entropy
minimization problem. Further, we provide simulation results indicating that
solutions of this problem are potentially non-unique due to symmetry breaking.
Also two general sources for bad quality of service can be detected, which we
refer to as isolation and screening.Comment: 28 pages, 5 figures; corrected several misprint