WAVE 성능향상을 위한 동적 충돌 윈도우 크기 기반에 EACW 조정기법

This paper proposes a technique for improving IEEE 802.11e EDCA performance by Active adjusting each class's contention windows sized based on WAVE. How can lower the send probability of high priority classes since it can't differentiate their collisions from those of low priority classes, leading to the channel underutilization on individual class traffics. We propose (EACW, EWMA-based Active CW adjustment scheme) algorithm which adapts each class window size based on each individual collision rate rather than one average collision rate. Our simulation experiment show that EACW achieves better utilization by around 5% at maximum. In the performance analysis, OBU(Onboard Unit) could collect data from RSU in case of a driving around the city(60㎞) and be offered enough road environment service from RSU by the extended network using 5.8㎓. The results show our approach is feasible for Active CW control in WAVE.