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The performance of prevalent MAC protocols in MANETs relies on the level of contention in networks. While contention-based MAC protocols such as CSMA suffer from inefficiency under high contention, slot-based MAC protocols such as TDMA perform in the opposite way. In this paper, the authors propose a hybrid protocol to which they refer as Load-Adaptive MAC (LA-MAC) protocol for MANETs. By adaptively switching its running mode between CSMA and TDMA, LAMAC achieves high channel utilization under both high and low contention. They report their implementation of LA-MAC on a MANET testbed formed by a collection of Multiple-Input Multiple-Output (MIMO) Universal Software Radio Peripheral (USRP) software defined radio nodes.
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