CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is actually the most used method in ad-hoc networks for transmitting on a contending medium, even if it shows poor performance in presence of hidden nodes. To increase performance, we propose an algorithm that combines CSMA and TDMA (Time Division Multiple Access) approaches. The adopted solution consists of grouping contending nodes in non-interfering subsets and granting a different numbers of time slots to different groups, while using the CSMA to manage medium access among nodes belonging to the same subset. An optimization procedure to assign the time slots to each subset of nodes and to find an equilibrium between contention and scheduling is presented.
Optimal Resource Allocation in Multi-Hop Networks: Contention vs. Scheduling / Badalamenti, R; Giarrè, Laura; Tinnirello, I.. - (2014), pp. 1055-1060. (Intervento presentato al convegno 22nd Mediterranean Conference on Control and Automation, MED 2014 tenutosi a Palermo nel June) [10.1109/MED.2014.6961514].
Optimal Resource Allocation in Multi-Hop Networks: Contention vs. Scheduling
GIARRÈ, Laura;
2014
Abstract
CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is actually the most used method in ad-hoc networks for transmitting on a contending medium, even if it shows poor performance in presence of hidden nodes. To increase performance, we propose an algorithm that combines CSMA and TDMA (Time Division Multiple Access) approaches. The adopted solution consists of grouping contending nodes in non-interfering subsets and granting a different numbers of time slots to different groups, while using the CSMA to manage medium access among nodes belonging to the same subset. An optimization procedure to assign the time slots to each subset of nodes and to find an equilibrium between contention and scheduling is presented.Pubblicazioni consigliate
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