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Impact of Relay Traffic on the Performance of Relayassisted FSO Systems: The Single Relay Case

In this paper, we consider the problem of having relay generated packets on the performance of relay-assisted Free Space Optical (FSO) communication systems in terms of source and relay packet delays as well as source and relay packet loss rates. First, a basic benchmark Quality of Service (QoS) agnostic system architecture is considered, where the source packets arriving at the relays and the relay packets are assumed to reside in the relays’ buffers in a priority-agnostic manner. The QoSagnostic relay buffering strategy is then compared to our three newly proposed buffering strategies, namely the so-called:`1) QoSaware same queue (SQ) strategy, where relay packets have a higher preemptive priority over source packets, 2) Different queue (DQ) strategy, where source and relay packets are  assumed to reside in two different queues, whose respective sizes are determined by a parameter called α, and 3) Different queue strategy with additive decrease and multiplicative increase (DQADMI), 
which is a variant of the DQ strategy where the sizes of the queues housing relay and source packets vary dynamically depending on the relay and source packet loss rates. The performance of all proposed relay buffering strategies is studied via an extensive simulation campaign. The obtained results demonstrate the advantage that the buffering strategies proposed in this paper have over the QoS-agnostic strategy when it comes to relay traffic related performance measures.  Report in pdf

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