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A Cooperative ARQ strategy in Ad hoc Cognitive Relays for Mobile Multimedia Communication  

An, Mi-Eun (Ewha W. University)
Kang, Hae-Lynn (Ewha W. University)
Kim, Nak-Myeong (Ewha W. University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.48, no.3, 2011 , pp. 28-35 More about this Journal
Abstract
Cooperative ARQ scheme is effective for better QoS guarantee for the next generation mobile communication systems where multimedia data transmission highly increases. In this paper, we propose a cooperative ARQ strategy in ad hoc cognitive relays for mobile multimedia communication for supporting instantaneous cooperation in MANET environment. In the proposed strategy, to support real time, delay-sensitive services, whenever a frame is transmitted from the source, each relay actively senses the SINR of the signal transmitted from the source, and determine whether to propose retransmission or not before the destination transmits feedback signal. To minimize the false retransmission decision or needless retransmission, we propose an adaptive sensing threshold optimization algorithm to maintain suboptimal sensing thresholds for each relay. By computer simulation, it is shown that the proposed cooperative ARQ retransmission scheme outperforms the conventional schemes with respect to frame transmission delay and frame loss probability in real time multimedia data transmission system.
Keywords
Cooperative ARQ; Cognitive Relay; MANET; Cooperative Diversity;
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