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5G 셀룰러 IoT 시스템을 위한 대규모 연결 랜덤 접속 기술

Random Access Techniques for Massive Connectivity in 5G Cellular IoT System

강충구|임민중
에스케이텔레콤 (주) (SKTelecom)|2015.12|Telecommunications Review|제25권 제6호|pp. 866-883

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참고문헌

키워드

사물 인터넷5세대 이동통신압축 센싱Internet of Thing (IoT)대용량 연결랜덤 접속5G mobile communicationMassive connectivityRandom accessCompressive sensing
주제분류전자/정보통신공학

초록

5G 셀룰러 시스템에서는 1km2 당 106개의 디바이스를 접속할 수 있는 대규모 연결성을 요구하고 있다. 특히 무수히 많은 Internet of Things(IoT) 디바이스가 접속됨에 따라 급증하는 Machine Type Communication(MTC) 트래픽을 지원할 수 있는 무선 접속 용량이 확보되어야 하며 짧은 길이의 패킷이 간헐적이고 산발적으로 발생하는 MTC 트래픽의 특성을 효율적으로 처리할 수 있어야 한다. 본 논문에서는 이러한 요구사항을 만족하기 위한 MTC 기술 동향을 살펴보고 5G 시스템에서 무선 접속 채널의 용량을 증대할 수 있는 구체적인 접근 방식으로서 압축 센싱(compressed sensing)과 대규모 다중 안테나(massive MIMO) 기술을 각각 접목한 랜덤 접속 방식에 대해서 논한다. 제안하는 압축 센싱 기반의 랜덤 접속을 통해 현재 Long Term Evolution(LTE) 시스템보다 더 높은 MTC 트래픽 용량을 확보할 수 있으며 대규모 다중 안테나 기반의 랜덤 접속은 동일 자원을 사용하여 여러 디바이스의 패킷을 동시에수신함으로써 랜덤 접속 용량을 크게 증대시킬 수 있다. 주제어:

Abstract

5G cellular system is expected to support a massive connectivity with a density of 106 devices/km2. It implies that sufficient radio access capacity must be provisioned to handle the ever increasing Machine Type Communication (MTC) traffic while dealing with the intermittent and sporadic transmission of rather short packets by a massive number of Internet of Things (IoT) devices. In this paper, we first investigate the current MTC technology trends that deal with these requirements and then, discuss two different approaches, compressed sensing-based and large-scale MIMO-based random access techniques, as a means of boosting the random access capacity. We have demonstrated that more MTC traffic capacity can be achieved by the proposed compressed sensing-based (grant-free) random access technique than grant-based random access as in LTE system, or by receiving the packets with a large number of antennas, that are transmitted simultaneously from the multiple devices over the same physical resources. Keywords:

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