A NOMA-Enhanced Reconfigurable Access Scheme with Device Pairing for MTC
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In this chapter, we present a multiple access scheme for machine-type communications for which high spectral efficiency and massive connectivity are demanded. To meet these requirements, we enhance the proposed access scheme with the reconfigurability feature to properly divide each time frame to three segments of grant-based NOMA, grant-based OMA, and random access. To obtain the length of each segment, an optimization problem is formulated which is solved by dividing it into two sub-problems. The first sub-problem nominates devices for the NOMA transmissions, while the second sub-problem derives the length of each segment as well as the parameter of the random access-based scheme. The results show that the proposed scheme outperforms the reconfigurable scheme which does not support NOMA.
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