본 논문은, 이종네트워크 환경에서 무선 백홀링의 주파수 효율을 현저히 증대시키는 non-orthogonal multiple access coordinated direct-and-relay transmission (NOMA-CDRT) 전송 프로토콜을 제안하고 성능을 분석한다. 기존에 제안된 두 명의 사용자를 서비스하기 위한 NOMA-CDRT 프로토콜을 개선하여 세 명의 사용자를 위한 프로토콜로 확장하여 동시 사용자 수 성능을 1.5배 개선한다. 제안한 전송 프로토콜은 두 구간에 걸쳐 세 사용자에게 NOMA-CDRT를 사용한 신호 전송을 하며, 이때의 사용자별 ergodic rate 및 네트워크의 ergodic sum-capacity를 유도하고 확률적 성능 분석을 수행한다. 제안한 프로토콜의 성능 향상을 검증하기 위하여, 시나리오별 사용자 ergodic rate 성능 및 네트워크 ergodic sum-rate 성능을 비교 분석한다. 수치적 분석을 통해, 제안 기술이 기존의 NOMA-CDRT 보다 향상된 데이터 전송률과 스펙트럼 효율 성능을 나타냄을 보인다.
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