이재준(Jae-Joon Lee)
소 속 장위국방연구소 연구부교수
기 간 내 용
관심분야 네트워크 IoT 상황인지예측 2002.01 ~ 2007.05

University of Southern California

컴퓨터 공학 박사 졸업

연 락 처 031-219-3990 2007.01 ~ 2007.12

University of Southern California

ANRG 연구원

이 메 일 jjnlee@ajou.ac.kr 2008.02 ~ 2010.01 삼성전자 DMC연구소
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In this letter, a reservation scheme with contention resolution diversity slotted ALOHA (CRDSA), called R-CRDSA, is proposed. Although CRDSA promises excellent performance compared to slotted ALOHA (SA), there are two barriers to be overcome for its use in satellite networks. The first is a low \emph{critical point} of an offered load; i.e., at this point, as the offered load increases, the throughput will decrease. CRDSA has a lower critical point than that of SA. The second barrier is that CRDSA has a lower capacity efficiency compared to SA; i.e., on average, CRDSA requires more power or bandwidth than SA for transmission. R-CRDSA can overcome these barriers at the same cost as CRDSA, especially for multi-packet messages. The analytic performances are derived by the observation of the transition between two successive frames, and the average number of packets in a message. The simulation results show that the analytic derivations are valid, and they confirm that the barriers are resolved by R-CRDSA.