About the SIG
Rate Splitting Multiple Access (RSMA), based on (linearly or nonlinearly) precoded Rate-Splitting (RS) at the transmitter and Successive Interference Cancellation (SIC) at the receivers, has emerged as a novel, general and powerful framework for the design and optimization of non-orthogonal transmission, multiple access, and interference management strategies in future MIMO wireless networks. RSMA relies on the split of messages and the non-orthogonal transmission of common messages decoded by multiple users, and private messages decoded by their corresponding users. This enables RSMA to softly bridge and therefore reconcile the two extreme strategies of fully decode interference and treat interference as noise. RSMA has been shown to generalize, and subsume as special cases, four seemingly different strategies, namely Space Division Multiple Access (SDMA) based on linear precoding (currently used in 5G), Orthogonal Multiple Access (OMA), Non-Orthogonal Multiple Access (NOMA) based on linearly precoded superposition coding with SIC, and physical-layer multicasting. RSMA boils down to those strategies in some specific conditions, but outperforms them all in general.
Through information and communication theoretic analysis, RSMA is shown to be optimal (from a Degrees-of-Freedom region perspective) in a number of scenarios and provides significant room for spectral efficiency, energy efficiency, fairness, reliability, QoS enhancements in a wide range of network loads and user deployments, robustness against imperfect Channel State Information at the Transmitter (CSIT), as well as feedback overhead and complexity reduction over conventional strategies used in 5G. The benefits of RSMA have been demonstrated in a wide range of scenarios (MU-MIMO, massive MIMO, multi-cell MIMO/CoMP, overloaded systems, NOMA, multigroup multicasting, mmwave communications, communications in the presence of RF impairments and superimposed unicast and multicast transmission, relay,…) and systems (terrestrial, cellular, satellite, …). Thanks to its versatility, RSMA has the potential to tackle challenges of modern communication systems and is a gold mine of research problems for academia and industry, spanning fundamental limits, optimization, PHY and MAC layers, and standardization.
In this SIG on RSMA, we provide a platform to bring together PhD students, researchers and engineers in academia and industry interested in the lower layers of wireless communication systems and in particular the design of 6G physical layer to share their ideas and discuss the major technical challenges, recent breakthroughs, new applications, open problems and challenges related to RSMA. Topics of interest of this SIG include, but are not limited to:
RSMA to achieve the fundamental limits of wireless networks
RSMA for multi-user/multi-cell multi-antenna networks
RSMA-based robust interference management
RSMA in MU-MIMO, CoMP, Massive MIMO, millimetre wave and higher frequency bands, relay, cognitive radio, caching, physical layer security, cooperative communications, cloud-enabled platforms (C-RAN, F-RAN), intelligent reflecting surfaces, etc
RSMA to generalize SDMA and NOMA
Physical layer design of RSMA-based network
Coding and Modulation for RSMA
Cross-layer design, optimization and performance analysis of RSMA
Implementation and standardization of RSMA
RSMA in B5G services such as enhanced eMBB, enhanced URLLC, enhanced MTC, massive MTC, massive IoT, V2X, cellular, UAV and satellite networks, wireless powered communications, integrated communications and sensing, etc.