Several cross-layer proposals have been created to optimize wireless sensor networks (WSNs) in terms of through- put, lifetime, and quality of service. In this work, a cross-layer solution combined to advertisement schemes is used to improve the throughput of ALOHA-based WSNs. Also, the throughput achieved by pure ALOHA and by slotted ALOHA are compared, showing the modifications of the advertisement scheme from pure to slotted ALOHA. These medium access methods were selected due to their lack of control messages transmission, which increases throughput efficiency when compared to the overhead added by other methods such as carrier sense multiple access (CSMA) and time division multiple access (TDMA). Finally, results show the throughput increase achieved by the cross-layer design and the advertisement schemes.