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In this paper, we study compressive random access (CRA) with two stages formachine-type communication (MTC) in cellular Internet-of-Things (IoT). Inparticular, we consider the case that each user (IoT device or sensor) has onlyone short message (of the same length) when it is activated to send data in IoTapplications. Two different CRA-based random access schemes are discussed (oneis conventional and the other is new based on a simplified handshakingprocess). Based on the throughput analysis, we show that the CRA-based randomaccess scheme with simplified handshaking process can outperform as its lengthof payload is adaptively decided depending on the number of active users.Simulation results confirm that the derived throughput expressions agree withthem and can be used to design a random access system for MTC with each activedevice or sensor that has one short message.

On Throughput of Compressive Random Access for One Short Message Delivery in IoT