Directional Reception Low Collision Probability MAC Protocol for Underwater Acoustic Networks
In the omni-directional underwater acoustic communication network, large propagation delay and high packet collision rate seriously affect the network performance. Compared with the omni-directional reception, the sound pressure and vibration velocity of the acoustic vector sensor can form a unilateral directivity through the linear weighted combination, so as to realize the directional reception of signals in a certain direction, and then effectively improve the network spatial multiplexing rate. The network outage probability in the directional reception mode of single vector sensor is analyzed, and its feasibility is also verified. Then, a Directional Reception Low Collision Probability Media Access Control (DRLCP-MAC) protocol is proposed, which uses a directional reception beam handshake mechanism to establish a stable data transmission link, and constructs multiple pairs of parallel communication links through state transition strategy, so as to reduce virtual carrier monitoring range and improve spatial reuse of the network. Simulation results show that compared with Multiple Access Collision Avoidance for Underwater (MACA-U) protocol and Slotted Floor Acquisition Multiple Access (Slotted-FAMA) protocol, the channel access cost of DRLCP-MAC is reduced by 50％ and 60％, the network throughput is increased by about 60％ and 400％, and the end-to-end delay is reduced by about 50％ and 85％.
万方数据
维普
