2 research outputs found
Mobility-aware Beam Steering in Metasurface-based Programmable Wireless Environments
Programmable wireless environments (PWEs) utilize electromagnetic
metasurfaces to transform wireless propagation into a software-controlled
resource. In this work we study the effects of user device mobility on the
efficiency of PWEs. An analytical model is proposed, which describes the
potential misalignment between user-emitted waves and the active PWE
configuration, and can constitute the basis for studying queuing problems in
PWEs. Subsequently, a novel, beam steering approach is proposed which can
effectively mitigate the misalignment effects. Ray-tracing-based simulations
evaluate the proposed scheme.Comment: In proceedings of IEEE ICASSP 2020. This work was funded by the
European Union via the Horizon 2020: Future Emerging Topics call
(FETOPEN-RIA), grant EU736876, project VISORSURF (http://visorsurf.eu
Ultra-dense Low Data Rate (UDLD) Communication in the THz
In the future, with the advent of Internet of Things (IoT), wireless sensors,
and multiple 5G killer applications, an indoor room might be filled with
s of devices demanding low data rates. Such high-level densification and
mobility of these devices will overwhelm the system and result in higher
interference, frequent outages, and lower coverage. The THz band has a massive
amount of greenfield spectrum to cater to this dense-indoor deployment.
However, a limited coverage range of the THz will require networks to have more
infrastructure and depend on non-line-of-sight (NLOS) type communication. This
form of communication might not be profitable for network operators and can
even result in inefficient resource utilization for devices demanding low data
rates. Using distributed device-to-device (D2D) communication in the THz, we
can cater to these Ultra-dense Low Data Rate (UDLD) type applications. D2D in
THz can be challenging, but with opportunistic allocation and smart learning
algorithms, these challenges can be mitigated. We propose a 2-Layered
distributed D2D model, where devices use coordinated multi-agent reinforcement
learning (MARL) to maximize efficiency and user coverage for dense-indoor
deployment. We show that densification and mobility in a network can be used to
further the limited coverage range of THz devices, without the need for extra
infrastructure or resources.Comment: 9 Figures; To be published at ACM NANOCOM 202