arXiv subjects

Yen-Hung Wu

Publications and source records attributed to Yen-Hung Wu.

3 recordsLinked to original sources

arXiv2026

Sharing-oriented Resource Allocation for Multi-platoon's Groupcasting and Unicasting Communication based on the Transmission Reliability

Resource allocation in vehicular platoons is challenging due to high vehicle mobility and limited spectrum resources. To improve spectral efficiency, resource sharing is commonly adopted. In 5G-based platoons, the Platoon Leader Vehicle (PLV) employs groupcasting to disseminate control messages to Platoon Member Vehicles (PMVs). When the groupcasting power is insufficient, a selected PMV acts as a Platoon Relay Vehicle (PRV) to extend the communication range. In addition, PMVs transmit unicast control messages to the vehicles following them for emergency coordination. This work proposes a sharing-oriented resource allocation method for both groupcasting and unicasting communication based on transmission reliability. For groupcasting, the proposed Tripartite Matching for Platoon Groupcasting (TMPG) algorithm applies tripartite matching to allocate subchannels shared by a PLV/PRV and corresponding individual entities (IEs), which denote cellular users or non-platooning vehicles. For unicasting, the proposed Resource Sharing for Platoons Unicasting (RSPU) algorithm (i) firstly partitions PMVs into clusters by considering intra-cluster interference and then (ii) uses tripartite matching to allocate a subchannel that is shared by a cluster of PMVs and the corresponding IE. Simulation results demonstrate that the proposed methods outperform benchmark schemes in terms of Quality of Service (QoS) satisfaction, the number of allocated subchannels, and spectral efficiency.

cs.NI↗

arXiv2024

Reliability-considered Multi-platoon's Groupcasting using the Resource Sharing Method

In the context of 5G platoon communications, the Platoon Leader Vehicle (PLV) employs groupcasting to transmit control messages to Platoon Member Vehicles (PMVs). Due to the restricted transmission power for groupcasting, it may need to pick one PMV as the Platoon Relay Vehicle (PRV) to be responsible for re-groupcasting messages of PLVs. To optimize the usage of limited spectrum resources, resource sharing can adopted to enhance spectrum efficiency within the platoon. This study proposes a resource allocation method, which is called Resource Sharing for Platoon Groupcasting (RSPG), for platoon groupcasting based on transmission reliability. RSPG utilizes tripartite matching to assign a subchannel to either a PLV or PRV that shares the assigned subchannel with the corresponding individual entity (IE), which does not belong to any platoon. The simulation results show that the proposed method performs better in terms of the QoS satisfaction rate of IEs, the number of allocated subchannels for platoons, and spectral efficiency.

cs.NI↗

arXiv2022

The UV-SCOPE Mission: Ultraviolet Spectroscopic Characterization Of Planets and their Environments

UV-SCOPE is a mission concept to determine the causes of atmospheric mass loss in exoplanets, investigate the mechanisms driving aerosol formation in hot Jupiters, and study the influence of the stellar environment on atmospheric evolution and habitability. As part of these investigations, the mission will generate a broad-purpose legacy database of time-domain ultraviolet (UV) spectra for nearly 200 stars and planets. The observatory consists of a 60 cm, f/10 telescope paired to a long-slit spectrograph, yielding simultaneous, almost continuous coverage between 1203 Å and 4000 Å, with resolutions ranging from 6000 to 240. The efficient instrument provides throughputs > 4% (far-UV; FUV) and > 15% (near-UV; NUV), comparable to HST/COS and much better than HST/STIS, over the same spectral range. A key design feature is the LiF prism, which serves as a dispersive element and provides high throughput even after accounting for radiation degradation. The use of two delta-doped Electron-Multiplying CCD detectors with UV-optimized, single-layer anti-reflection coatings provides high quantum efficiency and low detector noise. From the Earth-Sun second Lagrangian point, UV-SCOPE will continuously observe planetary transits and stellar variability in the full FUV-to-NUV range, with negligible astrophysical background. All these features make UV-SCOPE the ideal instrument to study exoplanetary atmospheres and the impact of host stars on their planets. UV-SCOPE was proposed to NASA as a Medium Explorer (MidEx) mission for the 2021 Announcement of Opportunity. If approved, the observatory will be developed over a 5-year period. Its primary science mission takes 34 months to complete. The spacecraft carries enough fuel for 6 years of operations.

astro-ph.IM↗