Contrary to orthogonal multiple-access (OMA), non-orthogonal multiple-access (NOMA) schemes can serve a pool of users without exploiting the scarce frequency or time domain resources. This is useful in meeting the sixth generation (6G) network requirements, such as, low latency, massive connectivity, users' fairness, and high spectral efficiency. On the other hand, content caching restricts duplicate data transmission by storing popular contents in advance at the network edge which reduces 6G data traffic. In this survey, we focus on cache-aided NOMA-based wireless networks which can reap the benefits of both cache and NOMA; switching to NOMA from OMA enables cache-aided networks to push additional files to content servers in parallel and improve the cache hit probability. Beginning with fundamentals of cache-aided NOMA technology, we summarize the performance goals of cache-aided NOMA systems, present the associated design challenges, and categorize related recent literature based on their application verticals. Concomitant standardization activities and open research challenges are highlighted as well. © 2022, CC BY.
Queueing networks, Standardization, Caching, Frequency domains, Low latency, Multiple access, Multiple access scheme, Network requirements, Non-orthogonal, Non-orthogonal multiple access, Time domain, User fairness, Surveys, Information Theory (cs.IT), Information Theory (math.IT), Networking and Internet Architecture (cs.NI)
D. Bepari et al, "A Survey on Cache-Aided NOMA for 6G Networks", arXiv, May 2022, doi: 10.48550/arXiv.2205.05321