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Towards Enabling Critical mMTC A Review of URLLC within mMTC

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Document pages: 16 pages

Abstract: Massive machine-type communication (mMTC) and ultra-reliable and low-latencycommunication (URLLC) are two key service types in the fifth-generation (5G)communication systems, pursuing scalability and reliability with low-latency,respectively. These two extreme services are envisaged to agglomerate togetherinto emph{critical mMTC} shortly with emerging use cases (e.g., wide-areadisaster monitoring, wireless factory automation), creating new challenges todesigning wireless systems beyond 5G. While conventional network slicing iseffective in supporting a simple mixture of mMTC and URLLC, it is difficult tosimultaneously guarantee the reliability, latency, and scalability requirementsof critical mMTC (e.g., < 4ms latency, $10^6$ devices km$^2$ for factoryautomation) with limited radio resources. Furthermore, recently proposedsolutions to scalable URLLC (e.g., machine learning aided URLLC for driverlessvehicles) are ill-suited to critical mMTC whose machine type users have minimalenergy budget and computing capability that should be (tightly) optimized forgiven tasks. To this end, our paper aims to characterize promising use cases ofcritical mMTC and search for their possible solutions. To this end, we firstreview the state-of-the-art (SOTA) technologies for separate mMTC and URLLCservices and then identify key challenges from conflicting SOTA requirements,followed by potential approaches to prospective critical mMTC solutions atdifferent layers.

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