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전술 애드 혹 네트워크에서 다중 홉 전송을 위한 자원 예약 및 백오프 기법
조윤철,윤선중,고영배,Cho, Youn-Chul,Yoon, Sun-Joong,Ko, Young-Bae 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.1
In multi-interface multi-channel(MIMC) based tactical ad hoc networks, QoS support for required operational capacity is one of the main challenging issues for multi-hop transmissions. To support QoS in such a harsh environment, we propose a novel MAC scheme to minimize multi-hop as well as per-hop delay. The current IEEE 802.11 MAC protocols should contend to reserve the channel resource at every hop by each sender. The every-hop channel contention results in a degradation of end-to-end delay for multi-hop transmissions. The basic idea of our scheme is to make a "multi-hop reservation" at the MAC layer by using the modified RTS frame. It contains additional information such as destination information, packet priority, and hop count, etc. In addition, we differentiate the contention window area according to the packet priority and the number of hops to deliver packets in the predefined allowed latency. Our scheme can minimize the multi-hop delay and support the QoS of the critical data in real time(i.e., VoIP, sensing video data, Video conference between commanders). Our simulation study and numerical analysis show that the proposed scheme outperforms the IEEE 802.11 MAC.
IP 기반 전술네트워크를 위한 효율적인 Link-K 메시지 통합 및 전송기법
윤선중,성윤경,조윤철,고영배,Yoon, Sun-Joong,Sung, Yun-Kyung,Cho, Youn-Chul,Ko, Young-Bae 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
Korea Department of Defense has been developing Link-K, Korean Joint Tactical Datalink, to support their independent joint operations and trying to enlarge the scope of Link-K tactical message delivery to nodes in IP based tactical networks for sharing situation awareness more broadly. A Link-K tactical message size is too small to fit into an IP packet, inefficiently wasting most of the IP packet space of the low bandwidth IP-based tactical networks. This paper proposes a new Link-K tactical message aggregation and delivery method when tactical messages need to be sent to some nodes located at IP-based tactical networks. With numerical analysis and OPNET simulation studies, we prove the effectiveness and efficiency of the proposed method.