A Requirements-Oriented MAC Protocol in Directional Ad Hoc Networks Using Collision-Free Dynamic Time Slot Assignment Algorithm

To satisfy the special demand of key information such as allegation information which cannot tolerate packet loss, this paper studies a novel requirements-oriented time slot assignment MAC protocol based on TDMA scheduling mechanism in Ad Hoc network using directional antenna, and a conflict-free dynamic time slot assignment algorithm based on requirement exchange is proposed. One scheduling process is divided into a requirement exchange stage and a data transmission stage. In the requirement exchange stage, each node runs a consistent pairing switching algorithm. After the requirement exchange stage is completed, each node can be guaranteed to obtain the transmission requirements of neighboring nodes. In the data transmission stage, according to the transmission requirements of the whole network, this paper proposes a maximizing concurrent transmission links (MCTL) time slot assignment algorithm. The MCTL algorithm is based on collision-free links group to achieve as many concurrent transmission links as possible in each scheduling process. Lastly, simulation results by OPNET 14.5 are given to evaluate the average delay and throughput of proposed algorithm.