Among many fundamental communication primitives in mobile ad hoc networks, 1-hop broadcast plays a significant role in which a message from the source node is delivered to all nodes within the source node’s transmission range. Although, the importance of it 1-hop broadcast is not easy to accomplish due to collisions in wireless networks known as hidden terminal problem. This paper presents a MAC protocol that guarantees 1-hop broadcast with efficiency by allowing as many simultaneous executions of the communication as possible without collisions.