n order to combat the exposed terminal problem and the interference accumulation phenomenon in wireless channels, this paper proposed a new Asymmetrical Dual Busy Tones (ADBT) MAC protocol. By introducing BT-CTS/BT-ACK mechanism and the approximate algorithm of interfering nodes, ADBT MAC can solve the exposed terminal problem and the hidden terminal problem in the environment with large interference range. Moreover, the effect of the interference accumulation phenomenon can be alleviated by the power adjustment approach for the busy tones. The network performances of DCF, DBTMA, VPDBT and ADBT MAC protocols are compared via OPNET-based simulation experiments, which verify that ADBT is able to prevent packet collisions effectively and improve the channel utilization significantly.
['Ke Liu', 'Supeng Leng', 'Huirong Fu', 'Longjiang Li']
A Novel Dual Busy Tone Aided MAC Protocol for Multi-hop Wireless Networks