RSMA for Future Generation Multiple Access: Challenges and Opportunities

Currently, the Rate Splitting Multiple Access (RSMA) scheme is gaining widespread attention as the most promising technique for multiple access in next-generation wireless communications. Its standout feature is the ability to support non-orthogonal transmission, making it increasingly popular for its interference-free transmission capabilities in highly diverse scenarios, which has been a critical bottleneck in existing access schemes. RSMA is considered to outperform its counterparts in terms of achievable rate and overall performance. This paper introduces RSMA and its system model along with its advantages over traditional schemes. It demonstrates the superiority in system performance as compared to orthogonal and non-orthogonal multiple access schemes. Additionally, we highlight the implementation challenges of RSMA and discuss future research opportunities in this direction.