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I Nyoman Apraz Ramatryana,Muneeb Ahmad,Krisma Asmoro,Soo Young Shin 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
Ultra-massive machine-type communications (umMTC) is the key point of 6G to support massive internet-of-things (IoT). To support these requirements, this paper proposes a novel advanced random access (ARA) scheme with non-orthogonal multiple access (NOMA) framework to improve the connectivity and also introduces an access controller (AC) to guarantee the performance. The proposed scheme is referred to as NOMA-Based ARA with AC (ACARA-NOMA). In ACARA-NOMA, human-type communications (HTC) and MTC devices are considered, where different power levels and AC are combined to protect HTC devices over MTC devices. It is shown that the proposed ACARA-NOMA has 10×improvement of normalized throughput (T=3.78 packet/slot with L=10 pre-determined power levels) compared to slotted ALOHA (T=0.37 packet/slot). The proposed ACARA-NOMA is a potential approach to support umMTC, where HTC can coexist with MTC in massive and critical IoT applications.
IRSA-NOMA with Power Diversity-Based Priority for 6G
I Nyoman Apraz Ramatryana,Soo Young Shin 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
In this letter, a novel power diversity-based priority (PDP) scheme is introduced in non-orthogonal multiple access with irregular repetition slotted ALOHA (IRSA-NOMA), referred to as PDP-IRSA-NOMA, for different groups of devices in 6G ultra-massive machine-type communications (umMTC). Compared to conventional IRSA-NOMA with random power levels, the PDP scheme controls higher power levels for a higher priority group. The performance evaluations show that PDP-IRSA-NOMA can outperform conventional IRSA-NOMA with higher normalized throughput, lower error floor in packet loss rate (PLR), and higher normalized efficiency.
Priority Access Controls in NOMA-Based Slotted ALOHA for 6G IoT Medium Access Controls
I Nyoman Apraz Ramatryana,Muhammad Sajid Sarwar,Soo Young Shin 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
In this paper, novel medium access control (MAC) relies on priority access control (PAC), uplink non-orthognal multiple access (NOMA), and slotted ALOHA (SA) (PACSA-NOMA) is proposed to solve dropped throughput performance at overload traffic condition for 6G internet of things (IoT). The main idea is to reduce collisions by controlling the number of devices at overload traffic for stable throughput performance. To evaluate the performance of PACSA-NOMA, density evolution is derived for packet loss rate in an asymptotic regime. Finally, numerical results validate PACSA-NOMA substantially increases the energy efficiency of the conventional RAs.