Age of Information Analysis for Finite Blocklength Regime in Downlink Cellular Networks

With increase in real-time systems, users have come to demand information with low latency. However, as the blocklength becomes finite to reduce communication duration, the decoding error probability is newly considered. In this letter, we consider downlink cellular networks, where base stations (BSs) periodically transmit information with finite blocklength to a user. To analyze the freshness of information, we derive the average age of information (AoI) and the AoI violation probability in a closed-form using the upper bound of the average decoding error probability. Finally, we show that an optimal blocklength that minimizes the AoI exists.

Automated summary

With the increase in real-time systems, users have higher demands for low-latency information. This letter investigates downlink cellular networks and considers the impact of decoding error probability on the freshness of information. The optimal blocklength is found to minimize the average age of information.