CAJ | 학술논문

基于多业务的p-persistent模型提出实时侦听的自适应算法(RLBSA)。该算法针对VANET4种优先级设置提出利用计算信道冲突/空闲比来优化信道的利用率，即当信道空闲较多时，节点根据自适应策略增加发送概率；而信道冲突较多时，则降低发送概率。该算法解决了在多种优先级业务并存的条件下需要对各个优先级发送节点数量进行估计的问题，且可以根据网络负载自适应调整刷新发送概率的时长，克服了需要预先根据网络密度设置侦听周期长度的弊端。仿真结果表明该算法可以很好解决当网络中存在大量高优先级数据时AC3业务的冲突问题，同时低优先级数据也能保证其访问信道的机会。
기우다업무적p-persistent모형제출실시정은적자괄응산법(RLBSA)。해산법침대VANET4충우선급설치제출이용계산신도충돌/공한비래우화신도적이용솔，즉당신도공한교다시，절점근거자괄응책략증가발송개솔；이신도충돌교다시，칙강저발송개솔。해산법해결료재다충우선급업무병존적조건하수요대각개우선급발송절점수량진행고계적문제，차가이근거망락부재자괄응조정쇄신발송개솔적시장，극복료수요예선근거망락밀도설치정은주기장도적폐단。방진결과표명해산법가이흔호해결당망락중존재대량고우선급수거시AC3업무적충돌문제，동시저우선급수거야능보증기방문신도적궤회。
A real-time listening based self-adaptive algorithm (RLBSA) is proposed in this paper to enhance the channel utilization rate according to the collision/idle ratio computed for four priorities of vehicular ad-hoc network (VANET). The nodes increase the transmission probability when the channel is relatively idle and decrease when channel is relatively busy. RLBSA has no need to know the number of nodes which can hardly be acquired by using mathematical method. Moreover, RLBSA can regulate the adjustment period of transmission probability according to the network load other than the fixed period which needs to be previously set. The simulation shows that RLBSA can successfully handle the collision problem of high priority data and the starvation of low priority data in the scenario with high node density.