RIS-Aided RSMA Improves the Latency Vs. Energy Trade-Off in the Finite Block Length MIMO Downlink
Soleymani M, Clerckx B, Schober R, Hanzo L (2026)
Publication Type: Journal article
Publication year: 2026
Journal
DOI: 10.1109/OJVT.2026.3675569
Abstract
We simultaneously minimize the latency and improve energy efficiency (EE) of the multi-user multiple-input multiple-output (MU-MIMO) rate splitting multiple access (RSMA) downlink, aided by a reconfigurable intelligent surface (RIS). Our results show that RSMA improves the EE and may reduce the delay to 13% of that of spatial division multiple access (SDMA). Moreover, RIS and RSMA support each other synergistically, while an RIS operating without RSMA provides limited benefits in terms of latency and cannot effectively mitigate interference. Furthermore, increasing the RIS size amplifies the gains of RSMA more significantly than those of SDMA, without altering the fundamental EE-latency trade-offs. Results also show that latency increases with more stringent reliability requirements, and RSMA yields more significant gains under such conditions, making it eminently suitable for energy-efficient ultra-reliable low-latency communication (URLLC) scenarios.
Authors with CRIS profile
Involved external institutions
Universität Paderborn
Germany (DE)
Imperial College London / The Imperial College of Science, Technology and Medicine
United Kingdom (GB)
University of Southampton
United Kingdom (GB)
Germany (DE)
Imperial College London / The Imperial College of Science, Technology and Medicine
United Kingdom (GB)
University of Southampton
United Kingdom (GB)
How to cite
APA:
Soleymani, M., Clerckx, B., Schober, R., & Hanzo, L. (2026). RIS-Aided RSMA Improves the Latency Vs. Energy Trade-Off in the Finite Block Length MIMO Downlink. IEEE Open Journal of Vehicular Technology. https://doi.org/10.1109/OJVT.2026.3675569
MLA:
Soleymani, Mohammad, et al. "RIS-Aided RSMA Improves the Latency Vs. Energy Trade-Off in the Finite Block Length MIMO Downlink." IEEE Open Journal of Vehicular Technology (2026).
BibTeX: Download