摘要
针对Wi-Fi多通道车载Mesh网络中移动客户端在不同的Mesh路由器间切换延时过高的问题,提出了一种快速MAC层切换管理方案。首先,将信道按优先级分为高优先级组、一般优先级组和低优先级组,优先级的数值表示信道可用的概率;然后,移动节点按组扫描所有信道,向一组中所有的信道发送完探测请求信息后,则回到原始信道收集回复信息;最后,当一个接入路由器的信号质量满足需求时,移动节点将终止扫描过程并进行认证、关联。实验结果表明,相比全扫描、选择性扫描和FHAP方案,所提方案减少了检测可用接入路由器的等待时间,并且大大地降低了切换过程中的数据包损耗比,实现了MAC层的平滑切换。
Delay of MAC layer handoff is too high inWi-Fi multichannel Vehicular Mesh Networks, for which a fast MAC layer handoff management schema is proposed. Firstly, channels are divided into high-priority, general priority and low priority groups, value of priority represents the probability of channel available. Then, mobile nodes scanning channels by groups, it will back to original channel to collect reply information as soon as it has sent detection request information to all channels in one group. Finally, mobile nodes finish the scanning process and do authentication and relevance when signal quality of an access router satisfies the demands. Experimental results show that proposed schema has reduced waiting time of detecting available access routes and packet loss ratio in handoff process comparing with all scanning, selective scanning and FHAP schemas, which indicates that it has im- plemented the smooth handoff in MAC layer.
出处
《科学技术与工程》
北大核心
2014年第8期53-60,共8页
Science Technology and Engineering
基金
国家自然科学基金项目(61069126)资助
