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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Abstract : Multi Frequency-Time Division Multiple Access (MF-TDMA) is a multiple access scheme that has widespread use in multimedia satellite networks. A network control center (NCC) receives capacity requests (CRs) from terminals, then it organizes a terminal burst time plan (TBTP) to be distributed eÆciently. This plan informs terminals when (timeslots) and where (carrier) to transmit their traÆc. Distributing the resource to the terminals is considered to be a bin packing problem. However, sometimes a packing loss may occur when packing the CRs into a TBTP. This means that even if there is suÆcient free space, some of the requested cannot be packed. In particular, this occurs more frequently if a total resource is fully requested. If a packing loss occurs, then the terminal whose bit of CRs is lost must transmit the lost part of the initial CRs again. This causes additional time delay for the terminal. This worsens information quality, since the round trip time (RTT) delay is originally large in a satellite network. In this paper, we address the packing loss phenomenon in MF-TDMA for uplinks of satellite networks. We define first packing loss ratio (PLR) and packing loss probability (PLP), then propose an adaptive packing strategy (APS) to reduce packing loss.