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MIMO-based Grant-free Access: Enabling Diverse QoS in Massive and Low-latency Communication
Ameha T. Abebe,Chung G. Kang 한국통신학회 2020 한국통신학회 학술대회논문집 Vol.2020 No.8
Grant-free (GF) access enables massive and low-latency access for various use cases of the 5th generation (5G) mobile communication and beyond. However, these use cases have diverse quality-of-service (QoS) requirements, which can be measured in terms of an access success rate and latency from a random access perspective. Consequently, a unifying GF scheme, which enables supporting of a diverse QoS, is highly desired. This paper proposes a GF access scheme in which high-QoS users superpose multiple preambles to achieve collision and multiple access interference diversity and ultimately improve their access success rate. We further show that in the presence of multiple antennas at the base station (BS) a low-complexity receiver correctly detects active preambles with a significantly high probability, even under severe multiple access interference caused by non-orthogonal preamble transmission. Simulation results demonstrate multiple orders improvement in terms of the access success rate for critical-QoS users, even under severe noise and multiple access contamination.