RIS-aided RSMA improves the latency vs. energy trade-off in the finite block length MIMO downlink
RIS-aided RSMA improves the latency vs. energy trade-off in the finite block length MIMO downlink
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.
1036-1048
Soleymani, Mohammad
7804052d-a88f-4075-a51e-653997e2b4b0
Clerckx, Bruno
981d040d-73b9-4d05-a0a7-64132e59144e
Schober, Robert
0d5d68ac-51f2-47f6-be69-ff9205c80749
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
18 March 2026
Soleymani, Mohammad
7804052d-a88f-4075-a51e-653997e2b4b0
Clerckx, Bruno
981d040d-73b9-4d05-a0a7-64132e59144e
Schober, Robert
0d5d68ac-51f2-47f6-be69-ff9205c80749
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Soleymani, Mohammad, Clerckx, Bruno, Schober, Robert and Hanzo, Lajos
(2026)
RIS-aided RSMA improves the latency vs. energy trade-off in the finite block length MIMO downlink.
IEEE Open Journal of Vehicular Technology, 7, .
(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.
Text
OJVT_2026_03_0192
- Accepted Manuscript
Text
RIS-Aided_RSMA_Improves_the_Latency_vs._Energy_Trade-Off_in_the_Finite_Block_Length_MIMO_Downlink
- Version of Record
More information
Accepted/In Press date: 12 March 2026
e-pub ahead of print date: 18 March 2026
Published date: 18 March 2026
Identifiers
Local EPrints ID: 510957
URI: http://eprints.soton.ac.uk/id/eprint/510957
ISSN: 2644-1330
PURE UUID: 56bfa0a5-f34d-463a-bbb3-943c3851d46a
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Date deposited: 28 Apr 2026 16:30
Last modified: 02 May 2026 01:35
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Contributors
Author:
Mohammad Soleymani
Author:
Bruno Clerckx
Author:
Robert Schober
Author:
Lajos Hanzo
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