Access Priority Provisioning Based on Random Access Parallelization for Prioritized Cellular IoT

In order to support diverse access requirements from various internet-of-things (IoT) applications, we propose a novel access priority provisioning technique that can be applied to the random access (RA) procedure in cellular networks. A key feature of our proposed technique is to allow for each IoT device to differentiate the number of simultaneously transmitted preambles during the RA procedure according to its own access priority. Since simultaneous transmission of multiple preambles (i.e., RA parallelization) can achieve the diversity effect during the access phase (i.e., RA procedure), the IoT devices using more preambles can achieve better access performance compared to those using fewer preambles. This motivates us to newly propose our access priority provisioning technique. We mathematically analyze our proposed technique in terms of the RA failure probability and validate our analytical framework with extensive computer simulations. From the results, we verify the feasibility of our proposed technique for supporting diverse access priorities during the access phase (i.e., RA procedure) without significant modifications to the conventional one.