Throughput optimal random medium access control for relay networks with time-varying channels
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Salehi Heydar Abad, Mehdi and Erçetin, Özgür and Ekici, Eylem (2018) Throughput optimal random medium access control for relay networks with time-varying channels. (Accepted/In Press)
The use of existing network devices as relays has
a potential to improve the overall network performance. In this
work, we consider a two-hop wireless relay setting, where the
channels between the source and relay nodes to the destination
node are time varying. The relay nodes are able to overhear
the transmissions of the source node which may have a weak
connection to the destination, and they help the source node by
forwarding its messages to the destination on its behalf, whenever
this is needed. We develop a distributed scheme for relay selection
and channel access that is suitable for time-varying channels,
and prove that this scheme is throughput optimal. We obtain the
achievable rate region of our proposed scheme analytically for
a relay network with a single source and a single relay node.
Meanwhile, for a more general network with more than one
relay nodes, we perform Monte-Carlo simulations to obtain the
achievable rate region. In both cases, we demonstrate that the
achievable rate region attained with our distributed scheme is
the same as the one attained with centralized optimal scheme.
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