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There are three generic services in 5G: enhanced mobile broadband (eMBB),ultra-reliable low-latency communications (URLLC), and massive machine-typecommunications (mMTC). To guarantee the performance of heterogeneous services,network slicing is proposed to allocate resources to different services.Network slicing is typically done in an orthogonal multiple access (OMA)fashion, which means different services are allocated non-interferingresources. However, as the number of users grows, OMA-based slicing is notalways optimal, and a non-orthogonal scheme may achieve a better performance.This work aims to analyse the performances of different slicing schemes inuplink, and a promising scheme based on rate-splitting multiple access (RSMA)is studied. RSMA can provide a more flexible decoding order and theoreticallyhas the largest achievable rate region than OMA and non-orthogonal multipleaccess (NOMA) without time-sharing. Hence, RSMA has the potential to increasethe rate of users requiring different services. In addition, it is notnecessary to decode the two split streams of one user successively, so RSMAlets suitable users split messages and designs an appropriate decoding orderdepending on the service requirements. This work shows that for network slicingRSMA can outperform NOMA counterpart, and obtain significant gains over OMA insome region.

Network Slicing for eMBB, URLLC, and mMTC: An Uplink Rate-Splitting Multiple Access Approach