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Specifically, we derive for the first time an exact closed-form expression of the average AoI achieved by irregular repetition slotted ALOHA (IRSA), and compare its performance to that of a slotted ALOHA ... Flanking traditional metrics such as throughput and reliability, age of information (AoI) is emerging as a fundamental tool to capture the performance of IoT systems. ... Irregular repetition slotted ALOHA (IRSA)  : In this case, channel access is organised over frames composed by m slots each. ...arXiv:2004.01998v2 fatcat:hecdbxhkyraetea4mel47gwim4