Impact of Channel Memory on the Data Freshness
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In this letter, we investigate the impact of channel memory on the average age of information (AoI) for networks with various packet arrival models under first-come-first-served (FCFS) and preemptive last-generated-first-served (pLGFS) policy over Gilbert-Elliott (GE) erasure channel. For networks with Beroulli arrival, we first derive the average AoI under pLGFS queuing policy, and then characterize the AoI gap between FCFS and pLGFS policies. For networks with periodic arrival, we derive the closed-form expression for the average AoI under pLGFS and propose a numerical algorithm for calculating that under FCFS efficiently. It is revealed that for pLGFS policy, the average AoI increases monotonically with channel memory η at η/1-η. For FCFS, the average AoI increases even faster, with an additional term related to the packet arrival rate.
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