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Information Freshness and Packet Drop Rate Interplay in a Two-User Multi-Access Channel
Emmanouil Fountoulakis,Themistoklis Charalambous,Nikolaos Nomikos,Anthony Ephremides,Nikolaos Pappas 한국통신학회 2022 Journal of communications and networks Vol.24 No.3
In this work, we combine the two notions of timelydelivery of information to study their interplay; namely, deadlineconstrainedpacket delivery due to latency constraints andfreshness of information. More specifically, we consider a twousermultiple access setup with random access, in which user 1is a wireless device with a buffer and has external bursty trafficwhich is deadline-constrained, while user 2 monitors a sensorand transmits status updates to the destination. We provideanalytical expressions for the throughput and drop probabilityof user 1. For user 2, we derive in closed form the age ofinformation distribution, the average age of information (AoI),and the probability the AoI to be larger than a certain valuefor each time slot. The relations reveal a trade-off between theaverage AoI of user 2 and the drop rate of user 1: the lower theaverage AoI, the higher the drop rate, and vice versa. Simulationscorroborate the validity of our theoretical results.