Throughput optimal random medium access control for relay networks with time-varying channels

Salehi Heydar Abad, Mehdi and Erçetin, Özgür and Ekici, Eylem (2019) Throughput optimal random medium access control for relay networks with time-varying channels. Computer Communications, 133 . pp. 129-141. ISSN 0140-3664 (Print) 1873-703X (Online)

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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.
Item Type: Article
Uncontrolled Keywords: Distributed; Relay networks; Throughput optimal
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Özgür Erçetin
Date Deposited: 08 Jun 2023 09:46
Last Modified: 08 Jun 2023 09:46

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