This paper analyzes the impact of statistical delay constraints on theachievable rate of a two-hop wireless communication link, in which thecommunication between a source and a destination is accomplished via abuffer-aided relay node. It is assumed that there is no direct link between thesource and the destination, and the buffer-aided relay forwards the informationto the destination by employing the decode-and-forward scheme. Givenstatistical delay constraints specified via maximum delay and delay violationprobability, the tradeoff between the statistical delay constraints imposed onany two concatenated queues is identified. With this characterization, themaximum constant arrival rates that can be supported by this two-hop link areobtained by determining the effective capacity of such links as a function ofthe statistical delay constraints, signal-to-noise ratios (SNR) at the sourceand relay, and the fading distributions of the links. It is shown thatasymmetric statistical delay constraints at the buffers of the source and relaynode can improve the achievable rate. Overall, the impact of the statisticaldelay tradeoff on the achievable throughput is provided.
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