Rate splitting multiple access for RIS-aided URLLC MIMO broadcast channels
Rate splitting multiple access for RIS-aided URLLC MIMO broadcast channels
The performance of modern wireless communication systems is typically limited by interference. The impact of interference can be even more severe in ultra-reliable and low-latency communication (URLLC) use cases. A powerful tool for managing interference is rate splitting multiple access (RSMA), which encompasses many multiple-access technologies like non-orthogonal multiple access (NOMA), spatial division multiple access (SDMA), and broadcasting. Another effective technology to enhance the performance of URLLC systems and mitigate interference is constituted by reconfigurable intelligent surfaces (RISs). This paper develops RSMA schemes for multi-user multiple-input multiple-output (MIMO) RIS-aided broad-cast channels (BCs) based on finite block length (FBL) coding. We show that RSMA and RISs can substantially improve the spectral efficiency (SE) and energy efficiency (EE) of MIMO RIS-aided URLLC systems. Additionally, the gain of employing RSMA and RISs noticeably increases when the reliability and latency constraints are more stringent. Furthermore, RISs impact RSMA differently, depending on the user load. If the system is underloaded, RISs are able to manage the interference sufficiently well, making the gains of RSMA small. However, when the user load is high, RISs and RSMA become synergetic.
Finite block length coding, MIMO systems, low latency, max-min energy efficiency, max-min rate, reconfigurable intelligent surface, ultra-reliable communications
Soleymani, Mohammad
e8aefe5e-c5a9-4ec2-b0cf-dcee5d745991
Santamaria, Ignacio
bffdd54f-71a5-485f-95e0-3116cbd453cb
Jorswieck, Eduard
df30daeb-24a3-4c45-a2ed-07ad736c7f76
Di Renzo, Marco
b804fb85-8d36-4853-af9b-2007a53ad322
Schober, Robert
60199fd9-4d5a-40c4-89fb-9b2a896888e3
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Soleymani, Mohammad
e8aefe5e-c5a9-4ec2-b0cf-dcee5d745991
Santamaria, Ignacio
bffdd54f-71a5-485f-95e0-3116cbd453cb
Jorswieck, Eduard
df30daeb-24a3-4c45-a2ed-07ad736c7f76
Di Renzo, Marco
b804fb85-8d36-4853-af9b-2007a53ad322
Schober, Robert
60199fd9-4d5a-40c4-89fb-9b2a896888e3
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Soleymani, Mohammad, Santamaria, Ignacio, Jorswieck, Eduard, Di Renzo, Marco, Schober, Robert and Hanzo, Lajos
(2025)
Rate splitting multiple access for RIS-aided URLLC MIMO broadcast channels.
IEEE Transactions on Wireless Communications.
(doi:10.1109/TWC.2025.3591365).
Abstract
The performance of modern wireless communication systems is typically limited by interference. The impact of interference can be even more severe in ultra-reliable and low-latency communication (URLLC) use cases. A powerful tool for managing interference is rate splitting multiple access (RSMA), which encompasses many multiple-access technologies like non-orthogonal multiple access (NOMA), spatial division multiple access (SDMA), and broadcasting. Another effective technology to enhance the performance of URLLC systems and mitigate interference is constituted by reconfigurable intelligent surfaces (RISs). This paper develops RSMA schemes for multi-user multiple-input multiple-output (MIMO) RIS-aided broad-cast channels (BCs) based on finite block length (FBL) coding. We show that RSMA and RISs can substantially improve the spectral efficiency (SE) and energy efficiency (EE) of MIMO RIS-aided URLLC systems. Additionally, the gain of employing RSMA and RISs noticeably increases when the reliability and latency constraints are more stringent. Furthermore, RISs impact RSMA differently, depending on the user load. If the system is underloaded, RISs are able to manage the interference sufficiently well, making the gains of RSMA small. However, when the user load is high, RISs and RSMA become synergetic.
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Accepted/In Press date: 2025
e-pub ahead of print date: 12 August 2025
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© 2002-2012 IEEE.
Keywords:
Finite block length coding, MIMO systems, low latency, max-min energy efficiency, max-min rate, reconfigurable intelligent surface, ultra-reliable communications
Identifiers
Local EPrints ID: 504541
URI: http://eprints.soton.ac.uk/id/eprint/504541
ISSN: 1536-1276
PURE UUID: eb493dbb-d0db-4441-a643-2b6cae28254e
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Date deposited: 15 Sep 2025 16:32
Last modified: 16 Sep 2025 16:44
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Contributors
Author:
Mohammad Soleymani
Author:
Ignacio Santamaria
Author:
Eduard Jorswieck
Author:
Marco Di Renzo
Author:
Robert Schober
Author:
Lajos Hanzo
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