transmits it through an RA channel (RACH). If more than one device tries to access to a base station (BS) simultaneously, then interference occurs at the RRH. During the past few years, a rich body of works on RA mechanisms has been developed [@xing2019novel; @jang2016non; @jiang2019reinforcement; @zhang2019dnn; @jiang2018analyzing; @grau2019preamble; @jang2019recursive; @jin2017recursive; @jang2019versatile] to mitigate interference and improve the RA success probability or reduce the access delay of an IoT device.

Most of the studies [@xing2019novel; @jang2016non; @jiang2019reinforcement; @zhang2019dnn; @jiang2018analyzing; @grau2019preamble; @jang2019recursive; @jin2017recursive; @jang2019versatile], however, assumed that the whole network resources were reserved for the IoT service and did not investigate the case of the coexistence of IoT service and many other services such as enhanced mobile broadband (eMBB) and ultra-reliable and low latency communications (URLLC). The research of the coexistence of IoT service and other services is essential as future networks are convinced to converge variety of services with different latency, reliability, and throughput requirements onto a shared physical infrastructure rather than deploying individual network solution for each service [@alliance20155g]. What is more, owing to the shared characteristic of network resources, some conclusions obtained in the case of providing sole IoT service may become inapplicable if multiple types of services 