【摘要】 BACnet标准没有规范具体的拥塞控制算法,并且不提供端到端的流量控制机制,常规的拥塞控制算法应用于BACnet网络并不合适。提出了一种新的BACnet网络拥塞控制策略,能够根据平均队列长度和报文的优先级计算丢弃概率,分布式地控制各个BACnet网络节点端到端的流量,通过主动拥塞控制机制达到拥塞避免和控制的目的。NS2仿真实验结果表明,该策略减少了平均服务延时,降低了报文丢失率,提高了网络吞吐量,增强了网络可靠性,为研究基于无连接协议的控制网络拥塞控制算法提供了一种模型和方法。更多还原

【Abstract】 BACnet standard does not regulate the specific congestion control algorithm,and does not provide end-to-end flow control mechanism,so the conventional congestion control algorithm is very inappropriate to be used in BACnet network.A new BACnet network congestion control strategy was proposed to calculate the drop probability according to the average queue length and the priority of message,control the end to end flux of each BACnet network station distributedly,and achieve the purpose of congestion avoidance and control by active congestion control mechanism.The NS2 emulation results show that this algorithm decreases the average service delay time,reduces the message loss rate,improves the network throughput,enhances the network reliability,and provides a model and method for congestion control mechanism of control network based on connectionless protocol.更多还原