dc.description.abstract |
Multibeam antenna arrays (MBAAs) have the capability
to improve the capacity of a wireless network by facilitating
simultaneous transmissions to multiple users. However, in practical
deployments of wireless personal or local area networks
(WPANs/WLANs) where piconet coordinators or access points
(PNCs/APs) are deployed with MBAAs, it is quite likely to
observe non-uniform node densities in various regions. To optimally
utilize MBAAs in such scenarios, concurrent transmission
scheduling in WPANs/WLANs is formulated as a multi-objective
optimization problem. Then, a practical heuristic transmission
scheduler that aims to maximize the number of concurrent communications
by dynamically configuring the directions of beams
is proposed. In addition, a service tag based fair scheduler is also
proposed to achieve weighted fairness in WPANs/WLANs with
MBAAs. Our results show that the performance improvements
provided by the proposed heuristic scheduler are higher for
antennas with lower beamwidths, and as the non-uniformity
in the network increases, the traffic supported in the network
increases in the range 24-41%, compared to the existing methods.
The proposed service tag based scheduler can further improve
the network throughput and achieve better fairness at the cost
of a few beam direction reconfigurations, as compared to the
existing methods and our heuristic scheduler. |
en_US |