Random Access with Layered Preambles based on NOMA for Two Different\n Types of Devices in MTC

2020/10/02 by Jinho Choi, Choi, Jinho
Engineering · #IoT Networks and Protocols #Advanced Wireless Communication Technologies #Wireless Communication Security Techniques

paper · pdf · doi:10.48550/arxiv.2010.01229

Abstract

In machine-type communication (MTC), random access has been employed for a\nnumber of devices and sensors to access uplink channels using a pool of\npreambles. To support different priorities due to various quality-of-service\n(QoS) requirements, random access can be generalized with multiple pools, which\nmay result in low spectral efficiency. In this paper, for high spectral\nefficiency, random access with layered preambles (RALP) is proposed to support\ndevices with two different priorities based on the notion of power-domain\nnon-orthogonal multiple access (NOMA). In RALP, two groups of devices, namely\ntype-1 and type-2 devices, are supported with different priorities, where\ntype-1 devices have higher priority than type-2 devices. Closed-form\nexpressions are derived for the detection performance of preambles transmitted\nby type-1 devices, which can be used for a certain performance guarantee of\ntype-1 devices of high priority. Low-complexity preamble detection methods are\nalso discussed.\n

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