For local wireless communications, the packet reservation multiple access (PRMA) protocol, which combines random access with time division access, has been proposed and analyzed. The study results shows that the performance of PRMA is degraded in the heavy load condition because of the contention mechanism of random access. In this paper, we propose the use of the adaptive array antenna with PRMA protocol to improve the performance. In the proposed model, the adaptive array can acquire a packet by pointing peak antenna pattern toward that packet even when a collision occurs. We evaluate the throughput performance by the theoretical analysis. We also evaluate the throughput and the packet dropping probability by the computer simulation. It is shown that the proposed model attains higher throughput and lower packet dropping probability than the conventional PRMA.
We propose two extended RMAV protocols in order to adapt to traffic pattern flexibly. At first, we propose the RMAV in which the frame length can increase in the next frame as many as slots the terminal needs, while in conventional RMAV the frame length increases one slot in the next frame. It is shown that the proposed model can attain lower value of mean message delay and the more rapid convergence speed than the conventional RMAV. Next, we propose the protocol with the function that supports prioritized traffic by using the variable maximum of the slots that the terminal can reserve in one frame for the terminal of each class. It is shown that the performance ofthe higher priority class can attain better performance compared to the lower priority class.
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