Abstract
In this paper, we investigate the problem of heterogeneous service coexistence in the scope of 5G and beyond (B5G) networks, where multiple ultra-reliable low-latency communication (URLLC) and enhanced mobile broadband (eMBB) users are connected to a common base station (BS), sharing physical network resources. In contrast to the orthogonal multiple access (OMA) and non-orthogonal multiple access (NOMA) usually adopted in literature, in this work we employ rate splitting multiple access (RSMA) for URLLC transmission, where a URLLC device splits its message into two sub-messages with partial transmission power, which are potentially recovered at the BS by means of successive interference cancellation (SIC). To study the performance of such methods in the presence of eMBB users, we consider both orthogonal and non-orthogonal network slicing approaches to share the network resources between heterogeneous user profiles with diverse requirements. As a result, we show that, in general, RSMA presents an improved performance in terms of sum-rate and reliability, even when transmitting concurrently with eMBB users. Finally, our results also show that the URLLC sum-rate can be increased by properly adjusting the rate splitting factor based on the average signal-to-noise ratio (SNR), not being necessary instantaneous channel state information (CSI).
Highlights
As the 5G technology deployment around the world evolves, it becomes clear how challenging are the three generic services encompassed by such technology, namely enhanced mobile broadband, ultra-reliable and low latency communications (URLLC), and massive machine type communications
NOVELTY AND CONTRIBUTION Motivated by the above literature, in this work we focus on increasing the URLLC spectral efficiency, allowing nonorthogonal sharing of frequency and time resources through rate-splitting for URLLC users, which we refer to U-rate splitting multiple access (RSMA)
SYSTEM MODEL We evaluate the uplink of multiple enhanced mobile broadband (eMBB) and URLLC users when communicating to a common Base Station (BS) in a single-cell network with shared radio resources
Summary
As the 5G technology deployment around the world evolves, it becomes clear how challenging are the three generic services encompassed by such technology, namely enhanced mobile broadband (eMBB), ultra-reliable and low latency communications (URLLC), and massive machine type communications (mMTC). For uplink RSMA systems, authors from [25], [26] study the problem of maximizing the sum-rate under proportional rate constraints for all users, by setting users transmission power and optimizing the decoding order at the BS through exhaustive search As a result, they show that RSMA achieves better performance than NOMA and OMA techniques, such as frequency division multiple access (FDMA) and time division multiple access (TDMA). RSMA to URLLC uplink transmission in a network slicing scenario, showing that RSMA can outperform OMA and NOMA methods for URLLC service even in the presence of eMBB interference, specially for very strict reliability levels.
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