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학술대회 Improving Latency Using Codes in Mission-Critical Communication
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김승현, 나지현
International Conference on Advanced Communication Technology (ICACT) 2017, pp.730-734
16MF1200, (통합)초연결 스마트 서비스를 위한 5G 이동통신 핵심기술개발, 정현규
Delays are crucial in mission-critical applications such as safety networks that exchange information in a short period of time to prevent impending accidents. When such applications are implemented in wireless systems, delays are inevitable, due to a defining characteristic of unstable wireless channels. Information signals sent over the air are inherently prone to distortion, thus often need to be retransmitted to ensure their successful decoding. It is crucial in mission-critical applications that the delays be short enough, although it may come with a cost in other aspects of communication, for example, reduced data rates. In this paper, we propose a novel technique that improves latency using codes. We consider the established cellular systems that are based on orthogonal frequency-division multiplexing (OFDM), and employ maximum-distance separable (MDS) codes for signals that are sent via parallel orthogonal carriers. As our main result, we show that compared to a naive approach that applies simple repetition coding schemes, our technique can achieve both better latency and data rate. This result suggests that by employing sophisticated coding schemes, one can improve latency without making much sacrifice in data rate.
Latency-rate trade-off, MDS codes, Mission-critical communication, OFDM systems, Packet failures
KSP 제안 키워드
Cellular system, Exchange information, Latency-rate trade-off, Maximum-distance separable (MDS) codes, Mission-critical communication, Novel technique, OFDM systems, Packet failures, Repetition Coding, Short period, communication delay