摘要
基于数据优先级提出了一种改进的无线MAC协议.数据在源节点按照一定策略被划分为不同的优先级,并且优先级信息被封装在数据帧中随数据在网络节点间移动;发送时,节点根据数据帧中的优先级调整IEEE 802.11 DCF中的竞争窗口,使不同优先级的数据帧使用不同的竞争窗口,以分散信道上的竞争压力,保证高优先级数据的优先发送.仿真结果表明,改进后协议不但明显减少了高优先级数据的传输时延,而且信道上的碰撞次数降低了近50%,改善了网络的性能.
An improved wireless MAC protocol is proposed based on data priority.The priority of data is identified according to a correlative strategy at source node.Both data and its priority are encapsulated into a frame and transmitted in network.When forwarding a data frame in IEEE 802.11 DCF mode,the node adjusts the contention window according to the data priority to make sure that the data with different priorities uses different contention windows,so that the collisions in the wireless channel can be reduced and the data with high-priority can be transmitted quickly.The simulation results showed that the improved protocol not only shortened the transmitting delay of data with high-priority,but also reduced the collisions by almost 50%.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2011年第2期93-96,共4页
Journal of Zhengzhou University（Engineering Science）
基金
河南省基础与前沿技术研究基金项目(72300410430)
